CN220513228U

CN220513228U - Injector driving device and medical liquid filling device

Info

Publication number: CN220513228U
Application number: CN202320626806.6U
Authority: CN
Inventors: 张鹏; 何广涛
Original assignee: Shenzhen Mindray Scientific Co Ltd
Current assignee: Shenzhen Mindray Scientific Co Ltd
Priority date: 2022-03-25
Filing date: 2023-03-24
Publication date: 2024-02-23
Anticipated expiration: 2033-03-24
Also published as: CN116803444A

Abstract

A syringe driving device comprises a push-pull module, a sliding block assembly, a screw rod, a filling driving piece and a connecting rod. The state switching piece can be arranged in a mode of rotating around the screw rod, and the screw rod does not need to reserve a movement space along the axial peripheral side area, so that the size of the structure can be reduced. The rotation of the state switching piece is related to the movement of the matching surface relative to the screw rod; the state switching piece is provided with a disengaging position and a meshing position in the rotating process of the state switching piece, and when the state switching piece is positioned at the disengaging position, the matching surface of the screw nut can be disengaged from the screw rod, so that the push-pull module can move relative to the screw rod under the external force of an operator; when the state switching piece is positioned at the engagement position, the matching surface of the screw nut can be engaged with the screw rod, so that the push-pull module is linked with the screw rod. The rotating movement of the state switching piece is completely different from the moving direction of the sliding block component relative to the screw rod, so that the situation that the screw nut moves to the disengaging position undesirably due to misoperation of the push-pull module can be reduced.

Description

Injector driving device and medical liquid filling device

Technical Field

The utility model relates to the field of medical instruments, in particular to a syringe driving device.

Background

Syringe pumps are a type of device that automatically enables injection of a drug, which can be manually operated instead of a caregiver, thereby reducing the workload of the caregiver.

The syringe pump typically has a push-pull module, a slider assembly, a screw, and a motor that drives the movement of the screw. The push-pull module is used for pushing a syringe arranged on the injection pump to inject medicine. The sliding block component is connected with the push-pull module and is provided with a screw nut. The screw nut is in two states of being meshed with the screw rod and being separated from the screw rod. When the screw nut is meshed with the screw rod, the whole push-pull module and the sliding assembly are fixedly connected with the screw rod, and the push-pull module can only move under the drive of the motor. When the screw is separated from the screw rod, the push-pull module and the sliding block assembly can move relative to the screw rod under the action of external force, and can be used for medical staff to move the push-pull module so as to install and take and place the injector.

In order to prevent the situation that medical staff excessively moves the push-pull module or the injection pump accidentally falls down or is impacted by other impacts and the like when the screw nut is separated from the screw rod, the injector is excessively injected (accidentally bolus) and the use safety is affected. Therefore, generally, the slider assembly further includes a state switching structure, which can timely switch the relative positional relationship between the screw and the screw rod, so as to avoid the screw from being separated from the screw rod under an unexpected condition. However, the existing state switching structure generally moves along the axial direction of the screw rod, so that enough space is required to be reserved for the state switching structure to move in the axial circumferential range of the screw rod, and the moving direction of the state switching structure is consistent with the moving direction of the sliding block assembly and the sliding module relative to the screw rod, so that the situation that the state switching structure undesirably drives the screw nut to move to a separation position due to misoperation of the sliding module easily occurs.

Disclosure of Invention

The application provides a syringe drive arrangement and medical liquid filling device for demonstrate a new locking and unlocking mode to push-and-pull module.

In view of the above, one embodiment of the present application provides a syringe drive device comprising a push-pull module, a slider assembly, a screw, a filling drive, and a connecting rod;

the push-pull module is used for pushing the injector to inject; the filling driving piece is used for driving the screw rod to move; the sliding block assembly comprises at least one screw nut and a state switching piece, wherein the screw nut is provided with a matching surface capable of being meshed with the screw rod, and the matching surface can move in a direction approaching to and away from the screw rod; one end of the connecting rod is connected with the sliding block assembly, and the other end of the connecting rod is connected with the push-pull module so that the sliding block assembly and the push-pull module can move along the axial direction of the screw rod together;

the state switching piece is arranged in a mode of being rotatable around the screw rod;

the rotation of the state switching piece is related to the movement of the matching surface relative to the screw rod; the state switching piece is provided with a disengaging position and a meshing position in the rotating process of the state switching piece, and when the state switching piece is positioned at the disengaging position, the matching surface of the screw nut can be disengaged from the screw rod, so that the push-pull module can move relative to the screw rod under the external force of an operator; when the state switching piece is positioned at the engagement position, the matching surface of the screw nut can be engaged with the screw rod, so that the push-pull module is linked with the screw rod.

In the injector driving device shown in the above embodiment, the state switching member may rotate around the screw rod, and the screw rod does not need to reserve a movement space along the axial peripheral region, so that the volume of the structure may be reduced. And the disengaging position and the engaging position of the state switching piece are positioned in the rotating motion, and the rotating motion is completely different from the moving direction of the sliding block component relative to the screw rod, so that the situation that the screw nut moves to the disengaging position undesirably due to misoperation of the push-pull module can be reduced.

In one embodiment, the slider assembly further comprises a first reset member that applies a restoring force to the nut;

when the state switching piece is positioned at the disengaging position, the screw is disengaged from the screw rod under the driving of the restoring force;

when the state switching piece is positioned at the meshing position, the state switching piece pushes the screw nut to be meshed with the screw rod.

In one embodiment, the state switching member has a first mating region and a second mating region, and the first mating region and the second mating region are located outside the nut and distributed around the circumference of the state switching member; the nut is provided with an abutting part facing the state switching piece, and the abutting part and the matching surface are respectively arranged on the opposite sides of the nut;

When the first matching area corresponds to the abutting part, the state switching piece is positioned at the disengaging position, and the first matching area provides an avoiding space for the abutting part to be far away from the screw rod so that the matching surface can be disengaged from the screw rod; when the second matching area corresponds to the abutting part, the state switching piece is located at the engagement position, and the second matching area pushes the screw nut to move towards the screw rod, so that the matching surface is engaged with the screw rod.

In one embodiment, the first mating region defines a first nut receiving region, the second mating region defines a second nut receiving region, and a movable space of the nut in the first nut receiving region along a radial direction of the screw rod is larger than a movable space of the nut in the second nut receiving region along the radial direction of the screw rod; when the state switching piece is positioned at the disengaging position, the screw is positioned in the first screw accommodating area and is disengaged from the screw rod; when the state switching piece is positioned at the engagement position, the screw is positioned in the second screw accommodating area and engaged with the screw rod.

In one embodiment, the abutting portion of each screw includes a first abutting portion and a second abutting portion, and the second abutting portion and the first abutting portion are arranged along the axial direction of the screw rod and are located on the same side of the screw; the first fit region and the second fit region are respectively provided with a first sub fit region and a second sub fit region, the first sub fit region is used for being matched with a first abutting part of a corresponding screw nut, and the second sub fit region is used for being matched with a second abutting part of the corresponding screw nut;

When the state switching piece is positioned at the disengaging position, a first sub-matching area of the first matching area corresponds to the first abutting part, and a second sub-matching area of the first matching area corresponds to the second abutting part, so that the matching surface can be disengaged from the screw rod; when the state switching piece is positioned at the engagement position, the first sub-engagement area of the second engagement area corresponds to the first abutting portion, and the second sub-engagement area of the second engagement area corresponds to the second abutting portion, so that the engagement surface is engaged with the screw rod.

In one embodiment, the first abutment has a first force-bearing surface for bearing the state switching member pressure, and the second abutment has a second force-bearing surface for bearing the state switching member pressure, the second force-bearing surface having an area larger than that of the first force-bearing surface.

In one embodiment, the first abutment and the second abutment are both provided in a convex manner.

In one embodiment, the abutment portion of each nut includes a first abutment portion located at an end of the nut, the first and second mating regions each having a first sub-mating region for mating with the first abutment portion of the corresponding nut;

When the state switching piece is positioned at the disengaging position, a first sub-matching area of the first matching area corresponds to the first abutting part, so that the matching surface can be disengaged from the screw rod; when the state switching piece is positioned at the engagement position, the first sub-engagement area of the second engagement area corresponds to the first abutting portion, so that the engagement surface is engaged with the screw rod.

In one embodiment, the abutting portion of each nut includes a second abutting portion having a set distance from an end of the nut, the first mating region and the second mating region each having a second sub-mating region for mating with the second abutting portion of the corresponding nut;

when the state switching piece is positioned at the disengaging position, the second sub-matching area of the first matching area corresponds to the second abutting part, so that the matching surface can be disengaged from the screw rod; when the state switching piece is positioned at the engagement position, the second sub-engagement area of the second engagement area corresponds to the second abutting portion, so that the engagement surface is engaged with the screw rod.

In one embodiment, the state switching member has an inner wall disposed along a circumferential direction thereof, the first sub-mating region of the first mating region and the first sub-mating region of the second mating region being different regions of the inner wall.

In one embodiment, in a cross section perpendicular to the rotation center line of the state switching member, the distances from the first sub-engagement region of the first engagement region to the rotation center line of the state switching member are equal throughout;

and/or the distances from the first sub-matching area of the second matching area to the rotation center line of the state switching piece are equal.

In one embodiment, on a cross section perpendicular to a rotation center line of the state switching member, a first sub-matching region of the first matching region has a first gradual change section, the first gradual change section has a first end and a second end which are oppositely arranged, and during the movement of the state switching member from the engagement position to the disengagement position, a first abutting part enters the first gradual change section from the first end of the first gradual change section and moves along the first gradual change section to the second end of the first gradual change section, and the distance from each part of the first gradual change section to the rotation center line of the state switching member gradually increases from the first end of the first gradual change section to the second end of the first gradual change section;

and/or, on a cross section perpendicular to a rotation center line of the state switching member, the first sub-matching region of the second matching region is provided with a second gradual change section, the second gradual change section is provided with a first end and a second end which are oppositely arranged, in the process that the state switching member moves from the disengaging position to the engaging position, the first abutting part enters the second gradual change section from the first end of the second gradual change section and moves to the second end along the second gradual change section, and the distance from each part of the second gradual change section to the rotation center line of the state switching member gradually decreases from the first end of the second gradual change section to the second end of the second gradual change section.

In one embodiment, the second sub-matching area of the first matching area is provided with an avoidance opening or an avoidance groove for extending out of the second abutting part of the corresponding nut;

and/or the distances from the second sub-matching area of the second matching area to the rotation center line of the state switching piece are equal.

In one embodiment, at least one of the abutting portions on each nut has a guide surface facing the state switching member, the guide surface has a first end and a second end disposed opposite to each other in a cross section perpendicular to a rotation center line of the state switching member, the first end of the guide surface is in contact with the second mating region during movement of the state switching member from the disengaged position to the engaged position, and a distance from each position of the guide surface to the rotation center line of the state switching member gradually increases from the first end of the guide surface to the second end of the guide surface.

In one embodiment, the device further comprises a screw closure holder which acts on the state switching member and applies a restoring force to the state switching member to drive the state switching member to move toward the engagement position.

In one embodiment, the sliding block assembly further comprises a sliding block fixedly connected with the connecting rod, the nut and the state switching member are mounted on the sliding block, and the state switching member can rotate on the sliding block; the screw closing retaining member is a torsion spring, the torsion spring surrounds the screw rod, one end of the torsion spring is installed on the sliding block, and the other end of the torsion spring is installed on the state switching member.

In one embodiment, the slider assembly further comprises an inner barrel, the inner barrel is provided with a middle through hole and at least one mounting groove penetrating through the side wall of the middle through hole along the radial direction of the inner barrel, the screw rod penetrates through the middle through hole, and the screw nut is embedded into the mounting groove; the state switching piece is arranged on the outer side of the inner cylinder and can rotate relative to the inner cylinder.

In one embodiment, one end of the nut is provided with the matching surface, the other end of the nut is provided with a resetting piece positioning part, the resetting piece positioning part is provided with a first resetting piece, and the first resetting piece applies force to the resetting piece positioning part so as to drive the matching surface to be far away from the screw rod.

In one embodiment, the nut is rotatably connected to the inner cylinder, and the first reset member is sleeved on the inner cylinder and the reset member positioning portion so as to apply force to the reset member positioning portion.

In one embodiment, the slider assembly further includes a state detection module, the state switching member has a detected portion, the state detection module is disposed on a rotation path of the detected portion, and the detected portion triggers the state detection module to obtain a detection signal.

In one embodiment, the sliding block assembly further comprises a brake module for locking the movement of the push-pull module, and the state switching piece is provided with a brake position during the rotation process of the state switching piece; the state switching piece is provided with a brake matching area, and the first matching area, the brake matching area and the second matching area are arranged around the circumference of the state switching piece;

when the brake matching area corresponds to the abutting part, the state switching piece is positioned at the brake position, and the state switching piece triggers the brake module to switch to a brake state so that the brake module locks the push-pull module.

In one embodiment, during rotation of the state switching member, the state switching member has at least one brake release position;

the state switching piece is provided with at least one brake release matching area, and the brake release matching area is arranged between the brake matching area and the second matching area in the circumferential direction of the state switching piece;

When the brake release matching area corresponds to the abutting part, the state switching piece is located at the brake release position, and the state switching piece triggers the brake module to switch to an unlocking state so that the brake module can unlock the push-pull module.

In one embodiment, in a cross section perpendicular to a rotation center line of the state switching member, a minimum distance from the first engagement region to the rotation center line of the state switching member is greater than a maximum distance from each of the brake disengagement region and the brake engagement region to the rotation center line of the state switching member; the minimum distance from each of the brake release engagement region and the brake engagement region to the rotation center line of the state switching member is greater than the maximum distance from the second engagement region to the rotation center line of the state switching member;

when the brake matching area or the brake releasing matching area corresponds to the screw, the screw and the screw rod are in a half-meshing state.

In one embodiment, the outer periphery of the state switching member is provided with a brake driving part, the brake module is provided with a trigger structure, and the trigger structure is arranged on a rotating path of the brake driving part;

When the brake release matching area corresponds to the nut, the brake driving part triggers the trigger structure to enable the brake module to be switched into the brake state;

when the brake matching area corresponds to the screw nut, the brake driving part releases the trigger structure, so that the brake module is switched to the unlocking state.

In one embodiment, the trigger structure is a mechanical trigger structure or an electrical signal trigger structure.

In one embodiment, the braking module is provided with a braking piece capable of locking the push-pull module, the triggering structure and the braking piece form a linkage structure, and in the linkage structure, the triggering structure drives the braking piece so as to enable the braking module to be switched into the braking state or the unlocking state.

In one embodiment, in the braking state, the braking member is locked by a friction structure, a magnetic attraction structure, a snap-fit structure and/or an engagement structure.

In an embodiment, the brake module has a mounting base, the brake element is movably mounted on the mounting base, the triggering structure includes a contact and a triggering elastic element, the contact is triggered by the brake driving portion, and the contact is connected with the brake element through the triggering elastic element, so as to drive the brake element to switch the brake module to the braking state and/or the unlocking state.

In one embodiment, the brake module has a second reset member, and the second reset member acts on the brake member to drive the brake member to reset the brake module to the unlocked state.

In one embodiment, the slider assembly further comprises a slider, the mounting base is fixed to the slider, and the brake extends toward a housing of a medical fluid filling device carrying the syringe to lock with the housing to prevent movement of the push-pull module relative to the housing.

In one embodiment, the slider assembly further includes a state switching driving member, and the state switching driving member is connected with the state switching member to drive the state switching member to rotate.

In one embodiment, the state switching member has a gear tooth portion, and the state switching driving member includes a motor and a transmission gear, and the motor is meshed with the gear tooth portion through the transmission gear to drive the state switching member to rotate.

In one embodiment, the device further comprises a limit detection module and a control unit; the state switching driving piece and the limit detection module are electrically connected with the control unit, and the limit detection module is used for detecting whether the injector and/or the push-pull module reach a loading limit position or not; when the control unit knows that the injector and/or the push-pull module reach the loading limit position, the state switching driving piece is controlled to drive the state switching piece to rotate to the meshing position.

In one embodiment, the device further comprises a state switching manual trigger and a control unit; the state switching driving piece and the state switching manual triggering piece are electrically connected with the control unit, the state switching manual triggering piece can input a locking switching signal to the control unit, and the control unit controls the state switching driving piece to drive the state switching piece to rotate to the meshing position according to the locking switching signal.

In one embodiment, the device further comprises a state switching manual trigger piece, wherein the state switching manual trigger piece and the state switching piece are of a linkage structure, and the state switching manual trigger piece can drive the state switching piece to rotate.

In accordance with the above objects, there is provided in one embodiment of the present application another syringe drive device comprising a push-pull module, a slider assembly, a screw, a filling drive, and a connecting rod;

the push-pull module is used for pushing the injector to inject; the filling driving piece is used for driving the screw rod to move;

the sliding block assembly comprises at least one screw, a state switching piece and a brake module, wherein the screw is provided with a matching surface capable of being meshed with the screw rod, and the matching surface can move in a direction approaching to and away from the screw rod;

One end of the connecting rod is connected with the sliding block assembly, and the other end of the connecting rod is connected with the push-pull module so that the sliding block assembly and the push-pull module can move along the axial direction of the screw rod together;

the brake module is provided with a brake state and an unlocking state; when the brake module is in a brake state, the brake module locks the push-pull module to move; when the brake module is in an unlocking state, unlocking the push-pull module;

the state switching piece is arranged in a mode of being capable of moving relative to the screw rod;

the state switching piece, the screw and the brake piece form a linkage structure, the screw is used for switching the engagement state with the screw rod based on the movement of the state switching piece, and the brake piece is used for switching the brake state and the unlocking state based on the movement of the state switching piece.

In the syringe driving device shown in this embodiment, the screw is switched to the engaged state with the screw rod based on the movement of the state switching member, and the brake member is switched to the brake state and the unlock state based on the movement of the state switching member. The state switching piece can control states of the screw and the brake piece simultaneously, so that the sliding block assembly, the push-pull module and the screw rod can be fixed through the screw, and the push-pull module can be locked through the brake piece.

In one embodiment, the state switching member is rotatably provided around the screw.

In one embodiment, the state switch member has a disengaged position, a brake position and an engaged position during movement of the state switch member, the brake position being located between the disengaged position and the engaged position; when the state switching piece is positioned at the disengaging position, the matching surface of the screw nut can be disengaged from the screw rod, and the push-pull module can move relative to the screw rod under the external force of an operator; when the state switching piece is positioned at the braking position, the state switching piece can trigger the braking module to switch to a braking state so that the braking module can lock the push-pull module; when the state switching piece is positioned at the meshing position, the matching surface of the screw nut can be meshed with the screw rod, so that the push-pull module is linked with the screw rod.

In one embodiment, the state switch has at least one brake release position during a rotational movement of the state switch;

when the state switching piece is positioned at the brake release parking place, the state switching piece can trigger the brake module to be switched into an unlocking state so that the brake module can unlock the push-pull module;

In the moving process of the state switching piece, the brake release position is arranged between the disengaging position and the brake position, and/or the brake release position is arranged between the engaging position and the brake position.

In accordance with the above objects, there is provided in one embodiment of the present application another syringe driving device comprising: the device comprises a push-pull module, a sliding block assembly, a screw rod, a filling driving piece and a connecting rod;

the push-pull module is used for pushing a push handle of the injector to move so as to fill liquid; the filling driving piece is used for driving the screw rod to move; one end of the connecting rod is connected with the sliding block assembly, and the other end of the connecting rod is connected with the push-pull module;

the sliding block assembly comprises a braking module, wherein the braking module is provided with an unlocking state and a braking state, and in the braking state, the sliding block assembly is locked by the braking module so as to prevent the sliding block from moving under the external force of an operator; in the unlocked state, the brake unlocks the slider assembly to enable the slider assembly and the push-pull module to move together axially along the lead screw.

In one embodiment, the slider assembly further comprises a state switch movably disposed; the movement of the state switching member is associated with a braking state and an unlocking state of the braking module;

Wherein, in the motion process of the state switching piece, the state switching piece is provided with a braking position and a braking position;

when the state switching piece is positioned at the braking position, the state switching piece can prompt the braking module to be switched into the braking state;

when the state switching piece is positioned at the brake release parking place, the state switching piece can promote the brake module to be switched into the unlocking state.

In one embodiment, the slider assembly includes a nut and an inner barrel, the inner barrel having a central through hole, the screw passing through the central through hole, the nut being disposed on the inner barrel and being capable of engaging and disengaging the screw.

In one embodiment, the state switching member is disposed outside the inner cylinder and is rotatable with respect to the inner cylinder.

In one embodiment, the state switching member has a braking position and a braking position during movement of the state switching member;

the state switching piece is provided with a brake driving part, the brake module is provided with a trigger structure, and the trigger structure is arranged on a rotating path of the brake driving part;

when the state switching piece is positioned at the braking position, the braking driving part triggers the triggering structure to enable the braking module to be switched into the braking state;

When the state switching piece is positioned at the brake release position, the brake driving part releases the trigger structure, so that the brake module can be switched to the unlocking state.

In one embodiment, the brake module has a brake member that locks with the housing of the medical fluid filling device in the braked state to prevent movement of the push-pull module relative to the housing; in the unlocking state, the brake piece is unlocked with the shell.

In an embodiment, the brake module has a mounting base, the brake element is movably mounted on the mounting base, the triggering structure includes a contact and a triggering elastic element, the contact is triggered by the brake driving portion, and the contact is connected with the brake element through the triggering elastic element, so as to drive the brake element to switch to the braking state and/or the unlocking state.

In one embodiment, the brake module has a second reset member, and the second reset member acts on the brake member to drive the brake member to reset to the unlocked state.

In one embodiment, the slider assembly includes a slider, the connecting rod is fixed to the slider, the mounting base is fixed to the slider, and the brake member is capable of extending toward a housing of a medical fluid filling device carrying the syringe to lock with the housing to prevent movement of the push-pull module relative to the housing.

In one embodiment, the slider assembly includes a state detection module, the state switching member has a detected portion, the state detection module is disposed on a movement path of the detected portion, and the detected portion triggers the state detection module to obtain a detection signal.

In one embodiment, the slider assembly includes a state switching drive coupled to the state switching drive to drive movement of the state switching drive.

In one embodiment, the device further comprises a limit detection module and a control unit; the state switching driving piece and the limit detection module are electrically connected with the control unit, and the limit detection module is used for detecting whether the injector and/or the push-pull module reach a loading limit position or not; and when the control unit knows that the injector and/or the push-pull module reach the loading limit position, the state switching piece is controlled to rotate to the engagement position.

In one embodiment, the device further comprises a state switching manual trigger and a control unit; the state switching driving piece and the state switching manual triggering piece are electrically connected with the control unit, the state switching manual triggering piece can input a locking switching signal to the control unit, and the control unit controls the state switching piece to rotate to the meshing position according to the locking switching signal.

In accordance with the above objects, there is provided in one embodiment of the present application a medical fluid filling device comprising:

a housing;

a syringe drive device according to any preceding claim, the syringe drive device being mounted on the housing, the push-pull module being arranged to push a syringe for injection;

and a control unit for controlling the syringe driving device.

In accordance with the above objects, there is provided in one embodiment of the present application another medical fluid filling device comprising:

The push-pull module is used for pushing a push handle of the injector to move so as to fill liquid;

a priming drive for providing a priming driving force;

the filling driving piece is connected with the screw rod to drive the screw rod to rotate;

the screw nut is in a linkage structure with the push-pull module, and is provided with a matching surface meshed with the screw rod, and the matching surface can move along the direction approaching to and away from the screw rod;

the state switching piece is sleeved outside the screw in a rotatable mode so as to limit the connection state of the screw and the screw, the inner wall of the state switching piece is provided with a first matching area and a second matching area, and the first matching area and the second matching area are arranged along the circumferential direction of the state switching piece; when the first matching area corresponds to the screw nut, the matching surface is separated from the screw rod; the mating surface is constrained to engage the lead screw when the second mating region corresponds to the nut.

The medical liquid filling device of this embodiment has a state switching member rotatably sleeved outside the screw. The inner wall of the state switching piece is provided with a first matching area and a second matching area, and the first matching area and the second matching area are arranged along the circumferential direction of the state switching piece. By rotating the position of the state switching piece, the first matching area can be corresponding to the screw nut, and the matching surface is separated from the screw rod, so that an operator can conveniently move the push-pull module, loading of the injector is realized, and the like; when the second matching area corresponds to the screw nut, the matching surface is limited to be meshed with the screw rod, and at the moment, the push-pull module cannot move under the action of operators or other unexpected external forces, so that the safety problem caused by the movement of the push-pull module is avoided. And the state switching piece is sleeved on the outer side of the screw in a rotatable mode, and the screw rod does not need to reserve a movement space along the axial peripheral side area, so that the size of the structure can be reduced. And the disengaging position and the engaging position of the state switching piece are positioned in the rotating motion, and the rotating motion is completely different from the moving direction of the sliding block component relative to the screw rod, so that the situation that the screw nut moves to the disengaging position undesirably due to misoperation of the push-pull module can be reduced.

Drawings

FIG. 1 is a schematic view of a syringe driving device according to an embodiment of the present application;

FIG. 2 is a cross-sectional view of a portion of the structure of a syringe drive device in one embodiment of the present application;

FIG. 3 is a schematic diagram illustrating the cooperation between a nut and a state switching member according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of the state switch member in the disengaged position when the first mating region of the state switch member corresponds to the nut according to an embodiment of the present disclosure;

FIG. 5 is a schematic view of the state switching member in the engaged position when the second mating region of the state switching member corresponds to the nut according to one embodiment of the present disclosure;

FIG. 6 is a cross-sectional view of the mating structure of the nut and other components with the state switch member in the engaged position in one embodiment of the present application;

FIG. 7 is a schematic diagram illustrating a fitting structure of a nut and an inner wall of a state switching member according to an embodiment of the present disclosure;

FIGS. 8 and 9 are schematic views illustrating the structure of the state switching member at different angles according to one embodiment of the present application;

FIG. 10 is an exploded view of a nut, inner barrel and first reduction in one embodiment of the present application;

FIG. 11 is a schematic diagram of a cooperation structure of a screw and an inner barrel with the screw in an embodiment of the present application;

FIG. 12 is a schematic view of a mating structure of the nut and the inner barrel with a state switching member according to an embodiment of the present disclosure;

FIG. 13 is a schematic view of a slider according to an embodiment of the present application;

FIGS. 14 and 15 are schematic illustrations of the structure of a slider assembly from different perspectives in one embodiment of the present application;

FIG. 16 is a schematic view of the mating structures of the state switching member, the state switching driving member, the state detecting module, the nut closing holder, and the like in one embodiment of the present application;

FIG. 17 is an exploded view of a brake module and a housing according to one embodiment of the present disclosure;

FIG. 18 is a schematic diagram of electrical signal connections of modules in one embodiment of the present application;

FIG. 19 is a schematic view showing the structure of each module of the liquid filling device for medical use according to an embodiment of the present application;

FIG. 20 is a schematic view of a structure of a nut, a screw, a status switching member, and a brake module according to an embodiment of the present disclosure;

FIG. 21 is a schematic diagram illustrating the cooperation between a nut and a state switching member according to an embodiment of the present disclosure;

FIG. 22 is a schematic diagram of a nut, a state switching member and a brake module according to an embodiment of the present invention

FIG. 23 is a schematic view of a state switch driven by gears according to an embodiment of the present application;

FIG. 24 is a schematic view of a structure of a screw in a state of being disengaged from a screw (matching a first connection state) according to an embodiment of the present application;

FIG. 25 is a schematic view of a structure of a screw in an engaged state with a screw (matching a second connection state) according to an embodiment of the present application;

FIG. 26 is a schematic longitudinal section of a nut opening and closing structure according to an embodiment of the present disclosure;

FIG. 27 is a schematic cross-sectional view of a nut opening and closing structure provided in one embodiment of the present application;

FIG. 28 is a schematic diagram of an assembled structure of a nut opening and closing structure and a slider according to an embodiment of the present disclosure;

FIG. 29 is a schematic view of a nut opening and closing structure and a slider removal nut according to an embodiment of the present disclosure;

FIG. 30 is a schematic structural view of a nut opening and closing structure according to an embodiment of the present disclosure;

FIG. 31 is a schematic view of a combination structure of a nut and an inner barrel according to an embodiment of the present disclosure;

FIG. 32 is a schematic structural view of an inner barrel provided in one embodiment of the present application;

FIG. 33 is a schematic view of a combination structure of a nut and a restoring member according to an embodiment of the present disclosure;

FIG. 34 is a schematic diagram showing a front view of a nut and state switch assembly according to an embodiment of the present disclosure;

FIG. 35 is a schematic perspective view of a nut and state switch assembly according to an embodiment of the present disclosure;

FIG. 36 is a schematic diagram showing a front view of a nut and locking head combination according to one embodiment of the present disclosure;

FIG. 37 is a schematic view of a first state structure of a first nut opening and closing structure according to an embodiment of the present disclosure;

FIG. 38 is a schematic view of a second state structure of a first nut opening and closing structure according to an embodiment of the present disclosure;

FIG. 39 is a schematic view showing a first state of a second nut opening and closing structure according to an embodiment of the present disclosure;

fig. 40 is a schematic view illustrating a second state structure of a second nut opening and closing structure according to an embodiment of the present application.

Detailed Description

The utility model will be described in further detail below with reference to the drawings by means of specific embodiments. Wherein like elements in different embodiments are numbered alike in association. In the following embodiments, numerous specific details are set forth in order to provide a better understanding of the present application. However, one skilled in the art will readily recognize that some of the features may be omitted, or replaced by other elements, materials, or methods in different situations. In some instances, some operations associated with the present application have not been shown or described in the specification to avoid obscuring the core portions of the present application, and may not be necessary for a person skilled in the art to describe in detail the relevant operations based on the description herein and the general knowledge of one skilled in the art.

Furthermore, the described features, operations, or characteristics of the description may be combined in any suitable manner in various embodiments. Also, various steps or acts in the method descriptions may be interchanged or modified in a manner apparent to those of ordinary skill in the art. Thus, the various orders in the description and drawings are for clarity of description of only certain embodiments, and are not meant to be required orders unless otherwise indicated.

The numbering of the components itself, e.g. "first", "second", etc., is used herein merely to distinguish between the described objects and does not have any sequential or technical meaning. The terms "coupled" and "connected," as used herein, are intended to encompass both direct and indirect coupling (coupling), unless otherwise indicated.

Example 1

The embodiment provides a syringe driving device of a medical liquid filling device. The medical fluid filling device may be used for injection of medical fluids or other fluids, such as, but not limited to, syringe pumps. The syringe drive device is used to effect a bolus injection of the syringe, for example by pushing a push handle of the syringe to squeeze the liquid in the syringe towards the patient.

In one embodiment, referring to fig. 1, the medical fluid filling device includes a syringe drive device, a housing 10, and other related structures. The injector driving device comprises a push-pull module 1, a sliding block assembly 5, a screw rod 1000, a filling driving piece 21, a connecting rod 13 and the like.

The housing 10 is a support structure that may be used to directly or indirectly support the push-pull module 1, the slider assembly 5, the lead screw 1000, the filling drive 21, the connecting rod 13, and the like. The push-pull module 1, the slider assembly 5, the screw 1000, the filling drive 21 and the connecting rod 13 may be mounted on the housing 10 directly or by other means. The housing 10 may be used as a housing for a medical fluid filling device or may be mounted within the housing of the medical fluid filling device itself.

The push-pull module 1 is used for pushing the injector to perform injection. The push-pull module 1 can adopt various structures capable of pushing a push handle of the injector so as to complete injection of the injector. One end of the connecting rod 13 is connected with the sliding block assembly 5, and the other end of the connecting rod 13 is connected with the push-pull module 1, so that the sliding block assembly 5 and the push-pull module 1 can form a whole and move simultaneously. The connecting rod 13 is usually fixedly connected at both ends to the slider assembly 5 and the push-pull module 1 in order to accurately transfer the movement of the slider assembly to the push-pull module 1 or to accurately transfer the movement of the push-pull module 1 to the slider assembly 5.

The priming drive 21 is used to drive movement of the screw 1000, for example the priming drive 21 may be a motor of various types. Referring to fig. 2-7, the slider assembly 5 includes at least one nut 100 and a state switching member 200. Referring to fig. 6 and 10, the nut 100 has a mating surface 110 capable of engaging with the screw 1000, and the mating surface 110 is capable of moving in a direction approaching and moving away from the screw 1000. The direction of movement of the nut 100 may be at an angle (not limited to a right angle, but may be at an acute or obtuse angle) to the axial direction of the screw 1000, such as in the embodiment of fig. 3-6, the nut 100 may be capable of being moved radially toward or away from the screw 1000. When the mating surface 110 of the nut 100 is brought closer to engage the screw 1000, the nut 100 and the screw 1000 form a screw nut pair, and the nut 100 is movable in the axial direction of the screw 1000 when the filling driver 21 drives the screw 1000 to rotate. The forward and reverse rotation output from the filling driving member 21 indirectly drives the screw 100 to reciprocate in the axial direction of the screw 1000. The slider assembly 5 is used as an integral assembly, and when the nut 100 reciprocates along the axial direction of the screw rod 1000, the whole slider assembly 5 is driven to reciprocate along the axial direction of the screw rod 1000, so that the connecting rod 13 and the push-pull module 1 are driven to reciprocate together, and a pushing handle of the injector is pushed, or a space is opened for assembling and disassembling the injector. When the mating surface 110 of the nut 100 is far away from the screw 1000, the slider assembly 5 can move relative to the screw 1000 under the external force of the operator, and the operator can freely move the push-pull module 1 at this time to change the position of the push-pull module 1, so as to achieve the corresponding functions, such as mounting and dismounting the injector.

The state switching member 200 is used for switching the state of the nut 100 with respect to the screw 1000. Referring to fig. 3-6, in some embodiments, the state switching member 200 is rotatably disposed about the wire rod 1000. In some embodiments, the state switching member 200 may be a ring-shaped structure, as shown in fig. 3-6, thereby forming a structure surrounding the screw 1000. In other embodiments, the state switch 200 may be disposed around only a portion of the circumference of the wire rod 1000, i.e., the state switch 200 may not completely encircle the entire wire rod 1000 (e.g., only half of the state switch 200 shown in FIG. 3). Regardless of whether or not the screw 1000 is looped, the state switching member 200 can be rotated around the axial direction of the screw 1000 to change the position.

Wherein the rotation of the state switching member 200 is associated with the movement of the mating surface 110 relative to the screw 1000. During the rotation of the state switching member 200, the state switching member 200 has a release position and an engagement position, as shown in fig. 4, when the state switching member 200 is located at the release position, the mating surface 110 of the nut 100 can be released from the screw 1000, so that the push-pull module 1 can move relative to the screw 1000 under the external force of an operator; as shown in fig. 5, when the state switching member 200 is in the engagement position, the engagement surface 110 of the nut 100 can engage with the screw 1000 to cause the push-pull module 1 to be interlocked with the screw 1000.

The rotation of state switch 200 is associated with the movement of mating surface 110 relative to lead screw 1000 including, but not limited to, the following: first, rotation of the state switching member 200 can directly or indirectly apply a force to the nut 100 that urges the mating surface 110 of the nut 100 into and out of engagement with the screw 1000; the second state switching member 200 does not apply a force to the nut 100 to cause the engagement surface 110 of the nut 100 to engage with or disengage from the screw 1000, but can change the stress state of the nut 100 so that the nut 100 can be engaged with or disengaged from the screw 1000 under other forces than the state switching member 200; third, the above two ways may be combined, that is, the rotation of the state switching member 200 can directly or indirectly apply a force for urging the mating surface 110 of the nut 100 into (or out of) engagement with the screw 1000 to the nut 100, and can change the stress state of the nut 100, so that the nut 100 can be out of (or into) engagement with the screw 1000 under a force other than the state switching member 200.

For the manner in which rotation of first state switching member 200 can apply a force to nut 100 that urges mating surface 110 of nut 100 into and out of engagement with screw 1000, in some embodiments state switching member 200 may remain attached to nut 100 at all times, thereby outputting force to nut 100 during both engagement and disengagement of nut 100 with screw 1000. For example, in some embodiments, the state switching member 200 may form a slider-crank mechanism or a mechanism of similar principle with the nut 100. In some embodiments, the nut 100 may be limited to only approaching and moving away from the screw 1000 (e.g., moving along the radial direction of the screw 1000), the state switching member 200 has a limit guide portion, and the limit guide portion can gradually move away from and gradually approach the screw 1000 during the rotation of the state switching member 200 around the screw 1000, and the nut 100 is rotationally connected to the limit guide portion, so that the limit guide portion drives the nut 100 to approach and separate from the screw 1000, so as to achieve engagement and disengagement.

For the second way of changing the stress state of the nut 100, in some embodiments, the state switching member 200 may be separated from the nut 100 at a certain position or reduce the force applied to the nut 100, and the nut 100 may be moved toward or away from the screw 1000 under other forces (such as the elastic force of an elastic member or the driving force of a motor and other driving members) to achieve engagement or disengagement.

For the third way, in some embodiments, the slider assembly 5 further includes a first reset member that applies a restoring force to the nut 100. When the state switching member 200 is in the release position, the nut 100 is released from the screw 1000 under the driving of the restoring force, and at this time, the state switching member 200 does not directly or indirectly apply the force for driving the nut 100 to be released from the screw 1000 to the nut 100. When the state switching member 200 is in the engagement position, the state switching member 200 directly or indirectly applies a force to the nut 100 to drive the nut 100 to approach the screw 1000, thereby pushing the nut 100 to engage with the screw 1000. The first restoring member may be, but is not limited to, an elastic restoring member or a driving member (e.g., motor, electromagnet, cylinder, hydraulic cylinder, etc.).

In the injector driving device according to the above embodiment, the state switching member 200 can rotate around the screw 1000, and the screw 1000 does not need to reserve a movement space in the axial peripheral region, so that the volume of the structure can be reduced. Further, the disengagement position and engagement position of the state switching member 200 are located in a rotational movement which is completely different from the movement direction of the slider assembly 5 with respect to the screw 1000, and occurrence of an unexpected movement of the nut 100 to the disengagement position due to a misoperation of the push-pull module 1 can be reduced.

Further, in some embodiments, the state switch member 200 may be disposed on a peripheral side of the nut 100 to push the nut 100 close to the screw 1000 in a pushing manner.

Referring to fig. 3-9, in some embodiments, the status switch 200 has a first mating region 201 and a second mating region 202. The first and second mating fields 201 and 202 are located outside the nut 100 and are distributed around the circumference of the state switching member 200. Referring to fig. 10 and 11, in some embodiments, the nut 100 has an abutment 120 facing the state switching member 200, and the abutment 120 and the mating surface 110 are disposed on opposite sides of the nut 100.

When the first engaging region 201 corresponds to the abutting portion 120, the state switching member 200 is located at the disengaging position, and the first engaging region 201 provides a space for avoiding the abutting portion 120 from the screw 1000, so that the screw 100 can be separated from the screw 1000 under other external forces, and the engaging surface 110 can be disengaged from the screw 1000. When the second mating region 202 corresponds to the abutment 120, the state switching member 200 is located at the engagement position, and the second mating region 202 pushes the nut 100 to move toward the screw 1000, so that the mating surface 110 is engaged with the screw 1000.

Wherein the nut 100 may be one or more. When there are a plurality of nuts 100, as shown in fig. 6 and 10, in some embodiments, the nuts 100 are in a pair and are disposed opposite to each other, and the mating surfaces 110 of the nuts 100 are disposed toward the screw 1000. At this time, the state switching member 200 may be provided with a corresponding first mating region 201 and a corresponding second mating region 202 for each nut 100.

Further, in some embodiments, the first mating field 201 defines a first nut receiving field and the second mating field 202 defines a second nut receiving field, the active space of the nut 100 in the radial direction of the screw 1000 in the first nut receiving field being greater than the active space of the nut 100 in the radial direction of the screw 1000 in the second nut receiving field. When the state switching piece 200 is located at the disengaging position, the nut 100 is located in the first nut accommodating area, and the nut 100 has enough space to disengage from the screw rod 1000 under the action of the first resetting piece; with state switch 200 in the engaged position, nut 100 is positioned within a second nut receiving area that is radially spaced from lead screw 1000 to facilitate movement of nut 100 into engagement with lead screw 1000.

Specifically, referring to fig. 6 and 7, in some embodiments, the first mating region 201 may define a first nut receiving region with the screw 1000, and the second mating region 202 may define a second nut receiving region with the screw 1000.

Further, the abutment 120 of each nut 100 may be one or more. As shown in fig. 3-5, in some embodiments, the abutment 120 may be one, and the state switching member 200 may provide a pair of first and second mating regions 201 and 202 for the abutment 120. In addition, in some embodiments, more than two abutting portions 120 of each nut 100 may be provided, and in this case, the first mating region 201 and the second mating region 202 may be provided with a corresponding sub-mating region for each abutting portion 120.

Referring to fig. 6-11, in some embodiments, the abutment portion 120 of each nut 100 includes a first abutment portion 121 and a second abutment portion 122, and the second abutment portion 122 and the first abutment portion 121 are arranged along the axial direction of the screw 1000 and are located on the same side of the nut 100. The more abutting portions 120 can ensure that the state switching member 200 has a plurality of force application points to the nut 100, and the force application points are arranged along the axial direction of the nut 100, so that multi-point ejection is realized, the nut 100 can move towards the screw 1000 more stably, and meanwhile, the reliability of the engagement between the nut 100 and the screw 1000 can be ensured.

The first and second mating regions 201, 202 have first and second sub-mating regions 2011, 2021, 2012, 2022, respectively, the first sub-mating regions 2011, 2021 being configured to mate with the first abutment 121 of the corresponding nut 100, and the second sub-mating regions 2012, 2022 being configured to mate with the second abutment 122 of the corresponding nut 100.

Specifically, referring to fig. 7 to 10, when the state switching member 200 is located at the disengaging position, the first sub-mating region 2011 of the first mating region 201 corresponds to the first abutting portion 121, and the second sub-mating region 2012 of the first mating region 201 corresponds to the second abutting portion 122, so that the mating surface 110 can be disengaged from the screw 1000; when the state switching member 200 is in the engaged position, the first sub-engagement region 2021 of the second engagement region 202 corresponds to the first abutment 121, and the second sub-engagement region 2022 of the second engagement region 202 corresponds to the second abutment 122, so that the engagement surface 110 is engaged with the screw 1000.

Each first sub-engagement region may also define a first nut receiving region and each second sub-engagement region may also define a second nut receiving region to effect movement of nut 100 away from and toward lead screw 1000.

Referring to fig. 10, in some embodiments, the first abutting portion 121 and the second abutting portion 122 are both disposed in a protruding manner.

Referring to fig. 10, in some embodiments, the first abutting portion 121 is disposed at an end of the nut 100, and the second abutting portion 122 is spaced from the first abutting portion 121. The first abutment 121 may have a first stress surface 1211 for receiving the pressure of the state switching member 200, and the second abutment 122 may have a second stress surface 1221 for receiving the pressure of the state switching member 200, and in some embodiments, the second stress surface 1221 has a larger area than the first stress surface 1211, so that the state switching member 200 applies a main pushing force to the second abutment 122, thereby avoiding deformation and damage of the end of the nut 100.

Of course, in other embodiments, the abutment 120 of each nut 100 may also include only the first abutment 121, the first abutment 121 is located at the end of the nut 100, and the first mating region 201 and the second mating region 202 have first sub-mating regions 2011 and 2021, respectively, and the first sub-mating regions 2011 and 2021 are used for mating with the first abutment 121 of the corresponding nut 100. When the state switching member 200 is located at the disengaging position, the first sub-engagement region 2011 of the first engagement region 201 corresponds to the first abutment 121, so that the engagement surface 110 can be disengaged from the screw 1000; when the state switching member 200 is in the engaged position, the first sub-engagement region 2021 of the second engagement region 202 corresponds to the first abutment portion 121, so that the engagement surface 110 is engaged with the screw 1000.

In other embodiments, the abutment 120 of each nut 100 may also include only the second abutment 122, the second abutment 122 is spaced apart from the end of the nut 100, and the first mating region 201 and the second mating region 202 have second sub-mating regions 2012, 2022, respectively, and the second sub-mating regions 2012, 2022 are configured to mate with the second abutment 122 of the corresponding nut 100. When the state switching member 200 is located at the disengaging position, the second sub-engaging region 2012 of the first engaging region 201 corresponds to the second abutting portion 122, so that the engaging surface 110 can be disengaged from the screw 1000; when the state switching member 200 is in the engaged position, the second sub-engagement region 2022 of the second engagement region 202 corresponds to the second abutment 122, so that the engagement surface 110 is engaged with the screw 1000.

Referring to fig. 4, 10 and 11, in some embodiments, because there is a difference between the first matching area 201 and the second matching area 202, in order to enable the nuts 100 to move more smoothly from the first matching area 201 to the second matching area 202, at least one abutting portion 120 of each nut 100 has a guiding surface 1212 facing the state switching element 200, and on a cross section perpendicular to a rotation center line of the state switching element 200, the guiding surface 1212 has a first end and a second end opposite to each other, and during the movement of the state switching element 200 from the disengagement position to the engagement position, the first end of the guiding surface 1212 is in contact with the second matching area 202 first, and distances from each position of the guiding surface 1212 to the rotation center line of the state switching element 200 gradually increase from the first end of the guiding surface 1212 to the second end of the guiding surface 1212.

Referring to fig. 7 and 11, in some embodiments, when the abutting portion 120 of the nut 100 includes the first abutting portion 121 and the second abutting portion 122, the guiding surface 1212 may be disposed on the first abutting portion 121, so that the first abutting portion 121 is mainly used for guiding the nut 100, and the second abutting portion 122 is mainly used for receiving the force applied by the state switching member 200. With this structure, by the engagement of the first abutting portion 121 and the second abutting portion 122, smooth transition of the nut 100 between the first engaging region 201 and the second engaging region 202 can be achieved, and engagement of the nut 100 with the screw 1000 can be ensured stably when the state switching member 200 pushes the top nut 100.

In order to enable the second stress surface 1221 of the second abutment 122 to better contact the state switching member 200, the second stress surface 1221 may have the same shape as the corresponding inner wall of the state switching member 200, for example, the second stress surface 1221 may be an arc-shaped surface.

Of course, in other embodiments, the guide surface 1212 may be provided on the second contact portion 122, and the second contact portion 122 may mainly guide the first contact portion 121 to mainly receive the biasing force of the state switching element 200. Alternatively, in other embodiments, the guide surface 1212 may be provided on both the first and second contact portions 121 and 122, and the guide function and the force may be distributed to the first and second contact portions 121 and 122.

Further, in some embodiments, both the first mating region 201 and the second mating region 202 may be part of the inner wall of the state switch 200, i.e., the first mating region 201 and the second mating region 202 have true existing abutment surfaces. Alternatively, in some embodiments, the second mating region 202 may be a relief structure, i.e., no real abutment surface exists.

Referring to fig. 4, 5, 8 and 9, in some embodiments, the state switching member 200 has an inner wall disposed along a circumferential direction thereof, and the first sub-mating region 2011 of the first mating region 201 and the first sub-mating region 2021 of the second mating region 202 are different regions of the inner wall. The first sub-mating area 2011 of the first mating area 201 may be recessed with respect to the first sub-mating area 2021 of the second mating area 202 to form a groove structure, so as to form a first nut accommodating area larger in a radial direction of the screw 1000.

In some embodiments, in a cross section perpendicular to the rotation center line of the state switching member 200, the distances from the first sub-engagement area 2011 of the first engagement area 201 to the rotation center line of the state switching member 200 are equal, i.e. the first sub-engagement area 2011 of the first engagement area 201 is a cambered surface with the same radius from the rotation center line. Of course, in other embodiments, the first sub-mating zone 2011 of the first mating zone 201 may also form a gradual arcuate surface or other shaped surface having a radius that gradually varies from the centerline of rotation.

Similarly, the first sub-engagement region 2021 of the second engagement region 202 is equidistant from the rotational centerline of the state switching member 200. I.e. the first sub-engagement region 2021 of the second engagement region 202 is a cambered surface having the same radius from the rotation center line. Of course, in other embodiments, the first sub-engagement region 2021 of the second engagement region 202 may also form a gradual arcuate surface or other shaped surface having a radius that gradually varies from the centerline of rotation.

Further, in order for the nut 100 to be able to more smoothly enter the second mating region 202 from the first mating region 201, please refer to fig. 4, 5 and 8, 9, in some embodiments, on a cross section perpendicular to the rotation center line of the state switching member 200, the first sub-mating region 2011 of the first mating region 201 has a first graded segment 205, the first graded segment 205 has a first end and a second end that are opposite to each other, and during the movement of the state switching member 200 from the engaged position to the disengaged position, the first abutting portion 121 enters the first graded segment 205 from the first end of the first graded segment 205 and moves along the first graded segment 205 to the second end thereof, and the distance from the first graded segment 205 to the rotation center line of the state switching member 200 gradually increases from the first end of the first graded segment 205 to the second end of the first graded segment 205;

Also, referring to fig. 4, 5 and 8, 9, in some embodiments, the first sub-engagement region 2021 of the second engagement region 202 has a second gradual section 206 in a cross section perpendicular to the rotation center line of the state switching member 200, the second gradual section 206 has a first end and a second end that are opposite to each other, and during the movement of the state switching member 200 from the disengaged position to the engaged position, the first abutting portion 121 enters the second gradual section 206 from the first end of the second gradual section 206 and moves along the second gradual section 206 to the second end thereof, and the distance from the second gradual section 206 to the rotation center line of the state switching member 200 gradually decreases from the first end of the second gradual section 206 to the second end of the second gradual section 206.

In some embodiments, the first transition 205 and the second transition 206 may exist at the same time, or may be alternatively arranged.

Further, in some embodiments, the second sub-mating zone 2012 of the first mating zone 201 and the second sub-mating zone 2022 of the second mating zone 202 may have the same shape as the first sub-mating zone 2011 of the first mating zone 201 and the first sub-mating zone 2021 of the second mating zone 202 described above. In addition, in some embodiments, the second sub-mating zone 2012 of the first mating zone 201 may be provided with the first graded segment 205 as described above, and the second sub-mating zone 2022 of the second mating zone 202 may be provided with the second graded segment 206 as described above.

Referring to fig. 8 and 9, in some embodiments, the second sub-mating region 2012 of the first mating region 201 has a relief opening from which the second abutment 122 of the corresponding nut 100 protrudes. The escape opening is provided through a side wall of the state switching member 200. In addition, in some embodiments, the relief port may be replaced with a non-through relief groove.

Referring to fig. 8 and 9, in some embodiments, the first sub-mating region 2011 and the second sub-mating region 2012 of the first mating region 201 are staggered back and forth in the circumferential direction, so that when the state switching member 200 moves from the engaged position to the disengaged position, the second abutting portion 122 first enters the second sub-mating region 2012 of the first mating region 201, and then the first abutting portion 121 starts to enter the first sub-mating region 2011 of the first mating region 201, so as to ensure that the second abutting portion 122 can fall into the second sub-mating region 2012 of the first mating region 201 when the first abutting portion 121 is located in the first sub-mating region 2011 of the first mating region 201.

Referring to fig. 8 and 9, in some embodiments, the first sub-mating region 2021 and the second sub-mating region 2022 of the second mating region 202 are circumferentially staggered back and forth, so that when the state switching member 200 moves from the disengaged position to the engaged position, the first abutting portion 121 enters the first sub-mating region 2021 of the second mating region 202 first, and then the second abutting portion 122 starts to enter the second sub-mating region 2022 of the second mating region 202. At this time, the avoidance port or the port wall or the groove wall of the avoidance groove of the second sub-mating region 2012 of the first mating region 201 may be set to be non-inclined, that is, when the second abutment portion 122 falls into the avoidance port or the avoidance groove, the avoidance port and the port wall or the groove wall of the avoidance groove may limit the second abutment portion 122, so as to prevent the second abutment portion from sliding out of the avoidance port and the avoidance groove. Only after the first abutting portion 121 slides from the first sub-engagement area 2011 to the second sub-engagement area 2012 under the guidance of the guide surface 1212, the nut 100 gradually moves toward the screw 1000 under the pushing of the state switching member 200, so that the second abutting portion 122 slides out from the escape opening and the escape groove.

Of course, in other embodiments, the first sub-mating region 2011 and the second sub-mating region 2012 of the first mating region 201 may also be aligned circumferentially, and the first sub-mating region 2021 and the second sub-mating region 2022 of the second mating region 202 may be aligned circumferentially, thereby synchronizing the first and second abutments 121 and 122 into the corresponding regions.

In other embodiments, the second sub-mating section 2012 of the first mating section 201 may not have relief openings. In a cross section perpendicular to the rotation center line of the state switching member 200, the distances from the second sub-engagement region 2012 of the first engagement region 201 to the rotation center line of the state switching member 200 are equal, i.e., the second sub-engagement region 2012 of the first engagement region 201 is an arc surface having the same radius from the rotation center line. Of course, in other embodiments, the second sub-mating zone 2012 of the first mating zone 201 may form a gradual curve or other shaped surface having a radius that varies gradually from the centerline of rotation.

Likewise, the second sub-engagement region 2022 of the second engagement region 202 is equidistant from the rotational centerline of the state switching member 200. I.e. the second sub-engagement region 2022 of the second engagement region 202 is a cambered surface having the same radius from the rotation centerline. Of course, in other embodiments, the second sub-mating region 2022 of the second mating region 202 may also form a gradual curve or other shaped surface having a radius that gradually varies from the centerline of rotation.

Further, referring to fig. 6 and 9, in some embodiments, the state switching member 200 is designed to be two-part, and includes an annular liner 261 and an outer barrel 262 sleeved on the annular liner 261. The areas where the second sub-mating area 2012 of the first mating area 201 and the second sub-mating area 2022 of the second mating area 202 contact the second abutting portion 122 are disposed on the annular liner 261, and the first sub-mating area 2011 of the first mating area 201 and the first sub-mating area 2021 of the second mating area 202 are disposed on the outer cylinder 262. The annular liner 261 has a material hardness greater than that of the outer tube 262, so that the strength of the second contact portion 122 can be ensured, the outer tube 262 can be supported, and the strength of the entire state switching member 200 can be improved. The outer cylinder 262 has a lower material hardness, which more easily guides the sliding of the first abutment 121 from the first sub-mating zone 2011 of the first mating zone 201 to the first sub-mating zone 2021 of the second mating zone 202.

Further, the nut 100 is movably mounted to a component in the slider assembly 5, and the movement of the nut 100 may include, but is not limited to, rotation, translation, or other movement.

Referring to fig. 6, 10 and 11, in some embodiments, the slider assembly 5 further includes an inner barrel 300, the inner barrel 300 having a central through hole and at least one mounting slot 320 extending radially through a sidewall of the central through hole of the inner barrel 300. The screw rod 1000 passes through the middle through hole, the screw 100 is embedded into the mounting groove 320, and the matching surface 110 of the screw 100 is arranged towards the position of the screw rod 1000.

In these embodiments shown in fig. 10 and 11, the nut 100 is rotatably mounted on the inner barrel 300. One end of the nut 100 is provided with a mating surface 110, and the other end is provided with a resetting piece positioning part 140. The rotation center part of the nut 100 is rotatably provided on the inner cylinder 300 through the rotation shaft 130; the portion where the mating surface 110 is provided is the non-rotational center portion of the nut 100. That is, the rotation shaft 130 and the mating surface 110 are respectively disposed, and the movement of the portion of the screw 100 where the mating surface 110 is disposed in the direction approaching and separating from the screw 1000 is realized by the rotation of the screw 100 along the rotation shaft 130.

Referring to fig. 10 and 11, in some embodiments, the reset element positioning portion 140 is provided with a first reset element 600, the first reset element 600 applies a force to the reset element positioning portion 140 to provide a pretightening force for driving the mating surface 110 away from the screw mandrel 1000 to the screw mandrel 100, and the screw mandrel 100 is kept away from the screw mandrel 1000 when the screw mandrel 100 is not acted upon by the state switching element 200.

Referring to fig. 6, 10 and 11, in some embodiments, the first restoring member 600 is looped over the inner barrel 300 and the restoring member positioning portion 140 to apply a force to the restoring member positioning portion 140. The first restoring member 600 is specifically an annular spring, and the first restoring member 600 can simultaneously compress two nuts 100, thereby simultaneously restoring the two nuts 100 through a simple structure. Of course, in other embodiments, the first restoring member 600 may be replaced with a compression spring, an extension spring, a torsion spring, a spring plate, or other elastic members.

Referring to fig. 6 and 10-12, in some embodiments, the state switching member 200 is disposed outside the inner cylinder 300 and can rotate relative to the inner cylinder 300. The inner barrel 300 may serve as a mounting base for the state switching member 200 such that the state switching member 200 may rotate relative to the inner barrel 300 and the nut 100. The inner cylinder 300 may axially position the state switching member 200 to prevent the state switching member 200 from axially moving on the inner cylinder 300. The axial positioning structure may be a protrusion provided on the outer wall of the inner cylinder 300, which may define a limit groove of the installation state switching member 200.

Further, referring to fig. 3, 13-15, in some embodiments, the slider assembly 5 further includes a slider 500, the slider 500 acting as the primary support structure for the entire slider assembly 5. The slider 500 is fixedly connected with the connecting rod 13, so as to achieve the purpose of fixing the whole slider assembly 5 with the connecting rod 13. The nut 100, the inner cylinder 300, and the state switching member 200 are mounted on the slider 500, and the state switching member 200 can rotate on the slider 500.

Referring to fig. 3 and 13-15, in some embodiments, the slider 500 has a mounting groove 501, and the inner barrel 300, the nut 100 and the state member are mounted together in the mounting groove 501 to form a unitary fastening structure. The screw 1000 passes through the groove wall of the fitting groove 501.

The slider 500 is provided slidably on the housing 10. For example, referring to fig. 1 and 2, in some embodiments, the slider 500 is slidably mounted on a sliding post 6, and the sliding post 6 is fixed to the housing 10.

Further, referring to fig. 16, in some embodiments, a screw closure holder 400 is further included, where the screw closure holder 400 acts on the state switching member 200 and applies a restoring force to the state switching member 200 to drive the state switching member 200 to move toward the engaged position.

Referring to fig. 16, in some embodiments, the screw closure holder 400 is a torsion spring that surrounds the screw 1000, one end of which is mounted on the slider 500 and the other end of which is mounted on the state switching member 200. When the rotational force of the driving state switching member 200 is removed, the screw closure holder 400 may return the driving state switching member 200 to the engaged position.

Referring to fig. 6, 8 and 16, in some embodiments, the slider assembly 5 further includes a state detection module 510, the state switch 200 has a detected portion 250, the state detection module 510 is disposed on a rotation path of the detected portion 250, and the detected portion 250 triggers the state detection module 510 to obtain a detection signal. The detected portion 250 may have one or more pieces so as to correspond to respective positional states of the state switching member 200, for example, an engaged position, a disengaged position, a brake stall, and the like of the state switching member 200, which will be mentioned later, may correspond to the detected portion 250, and when a certain detected portion 250 is detected by the state detecting module 510, it is indicated that the state switching member 200 is in a state corresponding to the detected portion 250 at this time. The status detection module 510 is also mounted on the slider 500 and forms an integral structure with the other components of the slider assembly 5 through the slider 500.

The state detection module 510 may take various structures capable of detecting position, such as, but not limited to, a photoelectric sensor, a pressure sensor, a hall switch, etc. The detected portion 250 is provided protruding in the outer circumferential direction of the state switching member 200.

Further, in some embodiments, the slider assembly 5 further includes a state switching driving member, and the state switching driving member is connected to the state switching member 200 to drive the state switching member 200 to rotate. The state switching driving member includes, but is not limited to, a driving source such as a motor, an electromagnet, a cylinder, a hydraulic cylinder, and the like.

Referring to fig. 16, in some embodiments, the state switching member 200 has a gear tooth portion 210, and the state switching driving member includes a motor 221 and a transmission gear 222, and the motor 221 is meshed with the gear tooth portion 210 through the transmission gear 222 to drive the state switching member 200 to rotate. The motor 221 is fixed to the slider 500 and forms a movable unit with the other components of the slider assembly 5.

Further, the control signal trigger of the state switching driving piece can be automatically triggered by the detection signal. In some embodiments, the system further comprises a limit detection module and a control unit. The state switching driving piece and the limit detection module are electrically connected with the control unit. The limit detection module is used for detecting whether the injector and/or the push-pull module 1 reach the loading limit position, which can be achieved by the prior art and is not described in detail herein. When the control unit knows that the injector and/or the push-pull module 1 reaches the loading limit position, the control state switching driving member drives the state switching member 200 to rotate to the engagement position. When the control unit does not know that the injector and/or the push-pull module 1 reach the loading limit position and knows that the nut 100 needs to be opened, the state switching driving piece can be controlled to drive the state switching piece 200 to rotate to the disengaging position.

The control signal trigger of the state switching drive may be manually triggered by an operator. In other embodiments, the system further comprises a state switching manual trigger and a control unit; the state switching driving piece and the state switching manual triggering piece are electrically connected with the control unit. The operator can input a locking switching signal to the control unit through the state switching manual trigger, and the control unit controls the state switching driving member to drive the state switching member 200 to rotate to the engagement position according to the locking switching signal. The operator can input a disengagement signal to the control unit through the state switching manual trigger, and the control unit controls the state switching driving member to drive the state switching member 200 to rotate to the engagement position to the disengagement position according to the disengagement signal. Wherein the manual trigger for state switching can be, but is not limited to, a physical key, a touch key, a voice command trigger, an action command trigger, etc.

In addition, the movement of the state switching member 200 may also be manually controlled by an operator. In other embodiments, the device further includes a state switching manual trigger, where the state switching manual trigger and the state switching member 200 are in a linkage structure, and the state switching manual trigger can drive the state switching member 200 to rotate. The state switching manual trigger can be, but is not limited to, a structure of a shift lever, a stretching, a pedal, a knob, a key and the like.

Further, when the state switching member 200 is switched from the disengaged position to the engaged position, or from the engaged position to the disengaged position, the nut 100 and the screw 1000 are in a semi-engaged state in a certain period of process, that is, the nut 100 cannot be completely disengaged from the screw 1000, and cannot be completely clamped with the screw 1000. In order to avoid undesired movements between nut 100 and screw 1000 during these processes, it is also possible to add a braking function during this process, temporarily locking push-pull module 1.

Specifically, in some embodiments, the slider assembly 5 further includes a brake module 700 for locking the movement of the push-pull module 1, and the state switching member 200 has a brake position during the rotation of the state switching member 200. Referring to fig. 3, the state switching member 200 has a brake engagement region 203, and the first engagement region 201, the brake engagement region 203 and the second engagement region 202 are arranged around the circumference of the state switching member 200. When the brake engagement area 203 corresponds to the abutment 120, the state switching member 200 is located at the brake position, and the state switching member 200 triggers the brake module 700 to switch to the braking state, so that the brake module 700 locks the push-pull module 1.

The brake engagement area 203 is located between the first engagement area 201 and the second engagement area 202, so as to ensure that the slider assembly 5 and the push-pull module 1 do not move when the nut 100 and the screw 1000 are in the semi-engaged state. Of course, when the state switching member 200 moves to the first engagement region 201 or the second engagement region 202, the brake module 700 releases the lock on the push-pull module 1, and whether the push-pull module 1 can freely move or not depends on the relative positional relationship between the screw 100 and the screw 1000 at this time.

Further, referring to fig. 3, in some embodiments, during the rotation of the state switching member 200, the state switching member 200 has at least one brake release position. The state switching member 200 has at least one brake release engagement region 204, and the brake release engagement region 204 is provided between the brake engagement region 203 and the first engagement region 201 and/or between the brake engagement region 203 and the second engagement region 202 in the circumferential direction of the state switching member 200. When the brake release engagement area 204 corresponds to the abutment 120, the state switching member 200 is located at the Jie Cha parking space, and the state switching member 200 triggers the brake module 700 to switch to the unlocked state, so that the brake module 700 unlocks the push-pull module 1. The design can enable the brake module 700 to be switched to the unlocking state in advance before the state switching piece 200 enters the disengaging position or the engaging position, so as to avoid the situation that the brake module 700 locks the push-pull module 1, and the push-pull module 1 cannot move freely or cannot move along with the screw rod 1000.

The first transition section 205 and/or the second transition section 206 may be replaced with the brake fit region 203 and/or the brake release fit region 204, and the brake fit region 203 and/or the brake release fit region 204 may also be replaced with the first transition section 205 and/or the second transition section 206.

Of course, in other embodiments, the brake module 700 is in the unlocked state as long as the abutting portion 120 corresponds to the first engagement region 201 or the second engagement region 202, and the first engagement region 201 and/or the second engagement region 202 are directly used as the brake engagement region 204 without the brake engagement region 204 being provided between the brake engagement region 203 and the first engagement region 201 and/or between the brake engagement region 203 and the second engagement region 202.

Further, referring to fig. 3, in some embodiments, when the brake engagement area 203 or the brake disengagement area 204 corresponds to the nut 100, the nut 100 and the screw 1000 are in a half-engaged state. In a cross section perpendicular to the rotation center line of the state switching member 200, the minimum distance from the first engagement region 201 to the rotation center line of the state switching member 200 is greater than the maximum distance from each of the brake disengagement region 204 and the brake engagement region 203 to the rotation center line of the state switching member 200; the minimum distance of each of the unbraking areas 204 and 203 to the rotational center line of the state switching member 200 is greater than the maximum distance of the second engagement area 202 to the rotational center line of the state switching member 200. With this design, the break-fit region 204 and the break-fit region 203 may also act as a transition to the abutment 120, enabling the abutment 120 to move more easily from the first fit region 201 into the second fit region 202.

In the above embodiment, the state control of the brake module 700 and the state control of the nut 100 and the screw rod 1000 are simultaneously implemented by using the state switching member 200, which not only simplifies the structure, but also skillfully implements the locking of the push-pull module 1 in the half-engagement state of the nut 100 and the screw rod 1000, further improves the reliability of locking the push-pull module 1, avoids the excessive injection (unexpected volume) of the injector, and improves the use safety of the device.

The triggering of the brake module 700 by the state switch 200 may be either a mechanical triggering or an electrical triggering.

Referring to fig. 2, 8, 9 and 17, in some embodiments, the state switching member 200 has a brake driving portion 220 at an outer periphery thereof, the brake module 700 has a trigger structure 730, and the trigger structure 730 is disposed on a rotation path of the brake driving portion 220. When the brake release engagement region 204 corresponds to the nut 100, the brake driving portion 220 triggers the trigger structure 730 to switch the brake module 700 to the braking state. When the brake engagement area 203 corresponds to the nut 100, the brake driving part 220 releases the trigger structure 730, so that the brake module 700 is switched to the unlocked state.

In some embodiments, trigger structure 730 is a mechanical trigger structure or an electrical signal trigger structure.

Further, referring to fig. 2 and 17, in some embodiments, the brake module 700 has a brake member 710 capable of locking the push-pull module 1, and the trigger structure 730 and the brake member 710 form a linkage structure, in which the trigger structure 730 drives the brake member 710 to switch the brake module 700 to a braking state or an unlocking state.

Further, in some embodiments, in the braking state, the brake 710 is locked by, but not limited to, friction structures, magnetic attraction structures, snap-fit structures, and/or engagement structures. The brake 710 may be locked with the housing 10 or a part fixedly disposed with respect thereto for braking purposes.

Further, referring to fig. 2 and 17, in some embodiments, the brake module 700 has a mounting base 750, the brake member 710 is movably mounted on the mounting base 750, the triggering structure 730 includes a contact 731 and a triggering elastic member 732, the contact 731 is triggered by the brake driving portion 220, and the contact 731 is connected to the brake member 710 through the triggering elastic member 732, so as to drive the brake member 710 to switch the brake module 700 to the braking state and/or the unlocking state.

Further, in some embodiments, the brake module 700 has a second reset member 720, and the second reset member 720 acts on the brake member 710 to drive the brake member 710 to reset the brake module 700 to the unlocked state. The second restoring member 720 may include, but is not limited to, an elastic member, a driving member (including, but not limited to, a driving member of a motor 221, an electromagnet, a cylinder, a hydraulic cylinder, etc.), and the like.

Referring to fig. 2 and 17, in some embodiments, the second restoring member 720 is a restoring spring.

Further, referring to fig. 2 and 17, in some embodiments, the mounting base 750 is fixed to the slider 500, which includes that the mounting base 750 may be at least partially integrally formed or fixedly connected to the slider 500. The brake 710 protrudes towards the housing 10 of the medical fluid filling device carrying the syringe for locking with the housing 10 to prevent movement of the push-pull module 1 relative to the housing 10.

Further, referring to fig. 2 and 17, in some embodiments, the brake 710 has a first engaging tooth 711, and the housing 10 also has a second engaging tooth 101, and when the brake module 700 is in the braking state, the first engaging tooth 711 protrudes toward the housing 10 and engages with the second engaging tooth 101 to prevent the movement of the slider assembly 5 and the push-pull module 1 relative to the housing 10. When the brake module 700 is in the unlocked state, the first engagement tooth 711 is disengaged from the second engagement tooth 101, and the brake 710 is disengaged from the housing 10.

In another aspect, some embodiments of the present application provide another syringe drive device comprising a push-pull module 1, a slider assembly 5, a screw 1000, a priming drive 21, and a connecting rod 13.

The slider assembly 5 comprises at least one screw 100, a state switching member 200 and a brake module 700, wherein the screw 100 is provided with a matching surface 110 capable of being meshed with the screw 1000, and the matching surface 110 can move along the direction approaching and separating from the screw 1000. One end of the connecting rod 13 is connected with the sliding block assembly 5, and the other end of the connecting rod 13 is connected with the push-pull module 1, so that the sliding block assembly 5 and the push-pull module 1 can move together along the axial direction of the screw rod 1000. The brake module 700 has a braking state and an unlocking state; when the brake module 700 is in a braking state, the locking push-pull module 1 moves; when the brake module 700 is in the unlocked state, it unlocks the push-pull module 1.

The state switching member 200 is provided in a movable manner with respect to the screw 1000. The state switching member 200 forms a linkage structure with the nut 100 and the brake member 710, the nut 100 switches an engagement state with the screw 1000 based on the movement of the state switching member 200, and the brake member 710 switches a braking state and an unlocking state based on the movement of the state switching member 200.

In the injector driving device according to this embodiment, the state switching member 200 may be used to control the engagement state of the nut 100 and the screw 1000, or may be used in a rotation manner as in the above embodiments, or may be used in other manners, for example, a structure in which the nut 100 is driven to engage with and disengage from the screw 1000 in the prior art may be used, for example, the state switching member 200 may be capable of reciprocating axially or radially along the screw 1000 to drive the nut 100 to approach and separate from the screw 1000 to achieve engagement and disengagement. The nut 100 switches the engagement state with the screw 1000 based on the movement of the state switching member 200, and the brake member 710 switches the braking state and the unlocking state based on the movement of the state switching member 200. The state switching member 200 can control the states of the screw 100 and the brake member 710 at the same time, so that the slider assembly 5 and the push-pull module 1 can be fixed to the screw 1000 by the screw 100, and the push-pull module 1 can be locked by the brake member 710.

In some embodiments, during movement of the state switch 200, the state switch 200 has a disengaged position, a brake position, and an engaged position, the brake position being located between the disengaged position and the engaged position; when the state switching piece 200 is located at the disengaging position, the matching surface 110 of the screw 100 can be disengaged from the screw 1000, and the push-pull module 1 can move relative to the screw 1000 under the external force of an operator; when the state switching piece 200 is positioned at the braking position, the state switching piece 200 can trigger the braking module 700 to switch to a braking state, so that the braking module 700 can lock the push-pull module 1; when the state switching member 200 is in the engagement position, the engagement surface 110 of the nut 100 can engage with the screw 1000, so that the push-pull module 1 is interlocked with the screw 1000.

The braking position is located between the disengaging position and the engaging position, so that when the screw nut 100 and the screw rod 1000 are in a semi-engaged state, the sliding block assembly 5 and the push-pull module 1 can be prevented from moving. Of course, when the state switching member 200 moves between the disengaged position and the engaged position, the brake module 700 releases the lock of the push-pull module 1, and whether the push-pull module 1 can freely move or not depends on the relative positional relationship between the screw 100 and the screw 1000 at this time.

In some embodiments, the state switch 200 has at least one brake release position during the rotational movement of the state switch 200. When the state switching piece 200 is located in the brake release parking space, the state switching piece 200 can trigger the brake module 700 to switch to the unlocking state, so that the brake module 700 can unlock the push-pull module 1. In the moving process of the state switching member 200, a brake release position is arranged between the disengaging position and the brake position, and/or a brake release position is arranged between the engaging position and the brake position. The design can enable the brake module 700 to be switched to the unlocking state in advance before the state switching piece 200 enters the disengaging position or the engaging position, so as to avoid the situation that the brake module 700 locks the push-pull module 1, and the push-pull module 1 cannot move freely or cannot move along with the screw rod 1000.

Of course, in other embodiments, the brake release position and/or the brake engagement position may be provided between the release position and the brake position and/or between the engagement position and the brake position, or the brake release position may not be provided, and the release position and/or the brake engagement position may be directly used as the brake release position, i.e. as long as the state switch 200 is located in the release position or the brake engagement position, the brake module 700 is in the unlocked state.

The specific structure of the brake module 700 and the assembly structure with other components of the slider assembly 5 can refer to, but not limited to, the brake module 700 described in the above embodiments.

The slide block assembly 5 comprises a brake module 700, wherein the brake module 700 has an unlocking state and a braking state, and in the braking state, the brake module 700 locks the slide block assembly 5 so as to prevent the push-pull module 1 from moving under the external force of an operator; in the unlocked state, the brake 710 unlocks the slider assembly 5 to enable the slider assembly 5 and the push-pull module 1 to move together axially along the screw 1000.

The brake module 700 is used for braking and unlocking the slider assembly 5 and the push-pull module 1 when the slider assembly 5 is in a disengaged state with the screw rod 1000, so as to prevent the push-pull module 1 from moving undesirably to cause the problem of excessive injection (unexpected bolus) of the injector, thereby improving the reliability of locking the push-pull module 1 and improving the use safety of the device.

In some embodiments, the slider assembly 5 further comprises a state switch 200, the state switch 200 being movably arranged; movement of the state switch 200 is associated with a braking state and an unlocking state of the braking module 700. During the movement of the state switching member 200, the state switching member 200 has a braking position and a braking position. When the state switching member 200 is located at the braking position, the state switching member 200 can cause the braking module 700 to switch to a braking state; when the state switching member 200 is located in the brake release position, the state switching member 200 can cause the brake module 700 to be switched to the unlock state.

The state switching member is not limited to the state switching member 200 described in the above embodiments, and may be any state switching member 200 described above that is rotatably disposed with respect to the screw rod 1000, or any state switching member 200 described above that can be used to control the engagement state of the screw 100 and the screw rod 1000 and the state switching member 200 of the brake module 700 at the same time, or any other state switching member 200 that can be used to control only the brake module 700.

In some embodiments, the triggering of the brake module 700 by the state switch 200 may be either a mechanical triggering or an electrical triggering.

In another aspect, some embodiments of the present application provide a medical fluid filling device comprising a housing 10, a syringe drive device as described in any one of the above, and a control unit. The injector driving device is arranged on the shell 10, and the push-pull module 1 is used for pushing the injector to inject; the control unit is used for controlling the injector driving device.

Example two

In one embodiment, a medical fluid filling device is provided that may be used for injection of medical fluids or other fluids, such as, but not limited to, syringe pumps.

In one embodiment, referring to fig. 18-25, the medical fluid filling device includes a push-pull module 1, a filling drive 21, a screw 1000, a nut 100, and a state switch 200.

The push-pull module 1 is used for pushing the push handle of the injector to move so as to fill liquid. The priming drive 21 is for providing a priming driving force. The filling driving member 21 is connected to the screw 1000 to drive the screw 1000 to rotate. A linkage structure is arranged between the screw 100 and the push-pull module 1, the screw 100 is provided with a matching surface 110 meshed with the screw 1000, and the matching surface 110 can move along the direction approaching to and separating from the screw 1000. The state switching member 200 is rotatably sleeved on the outer side of the nut 100 to limit the connection state of the nut 100 and the screw rod 1000, the inner wall of the state switching member 200 is provided with a first matching region 201 and a second matching region 202, and the first matching region 201 and the second matching region 202 are arranged along the circumferential direction of the state switching member 200; when the first fitting region 201 corresponds to the nut 100, the fitting surface 110 is disengaged from the screw 1000; when second mating field 202 corresponds to nut 100, mating surface 110 is constrained to engage lead screw 1000.

Referring to fig. 18-25, in one embodiment, the apparatus further includes a state switching driving member 221, where the state switching driving member 221 is connected to the state switching member 200 to drive the state switching member 200 to rotate around the nut 100.

Referring to fig. 18-25, in one embodiment, the device further includes a limit detection module 3 and a control unit 4; the state switching driving piece 221 and the limit detection module 3 are electrically connected with the control unit 4, and the limit detection module 3 is used for detecting whether the push handle and/or the push-pull module 1 reach the loading limit position; when the control unit 4 knows that the push handle and/or the push-pull module 1 reaches the loading limit position, the control state switching member 200 is controlled to rotate so that the second matching region 202 corresponds to the nut 100.

Referring to fig. 18-25, in this embodiment, the device further includes a brake module 700, where the brake module 700 has a brake member 710 capable of locking the push-pull module 1, and the brake member 710 is controlled by the control unit 4, and when the control unit 4 knows that the push handle and/or the push-pull module 1 reaches the loading limit position, the brake member 710 is controlled to lock the push-pull module 1.

In another embodiment, the device further comprises a state switching manual trigger (not shown in the figure) and a control unit 4; the state switching driving piece 221 and the state switching manual triggering piece are electrically connected with the control unit 4, the state switching manual triggering piece can input a locking switching signal to the control unit 4, and the control unit 4 controls the state switching piece 200 to rotate according to the locking switching signal, so that the second matching area 202 corresponds to the nut 100.

In this embodiment, the device further comprises a brake module 700, the brake module 700 is provided with a brake piece 710 capable of locking the push-pull module 1, the brake piece 710 is controlled by the control unit 4, and the control unit 4 controls the brake piece 710 to lock the push-pull module 1 according to the locking switching signal.

In another embodiment, the device further includes a state switching manual trigger, where the state switching manual trigger and the state switching member 200 are in a linkage structure, and the state switching manual trigger can drive the state switching member 200 to rotate, so that the second matching area 202 corresponds to the nut 100.

In this embodiment, the device further includes a brake module 700, where the brake module 700 has a brake member 710 capable of locking the push-pull module 1, and the brake member 710 and the manual state switching trigger member are in a linkage structure, and the manual state switching trigger member is capable of controlling at least the brake member 710 to lock the push-pull module 1.

In the above embodiments, referring to fig. 18 to 25, the state switching member 200 and the braking member 710 form a linkage structure to drive the braking member 710 to lock the push-pull module 1.

The state switching member 200 has a brake driving portion 220, the brake module 700 has a triggering structure 730, the triggering structure 730 is disposed on a rotation path of the brake driving portion 220, and when the brake driving portion 220 rotates to the triggering structure 730, the triggering structure 730 can be triggered, so that the brake member 710 locks the push-pull module 1.

Referring to fig. 18-25, in one embodiment, the inner wall of the state switching member 200 has a brake engagement area 203, the brake engagement area 203 is located between the first engagement area 201 and the second engagement area 202, and when the brake engagement area 203 corresponds to the nut 100, the brake driving portion 220 drives the brake member 710 to lock the push-pull module 1, and the nut 100 and the screw 1000 are in a semi-engaged state.

Referring to fig. 18-25, in one embodiment, the brake 710 is a friction type brake, in an unlocked state, the brake 710 releases the push-pull module 1, and in a braked state, the brake 710 locks the push-pull module 1.

In one embodiment, the brake module 700 includes a release state reset member that acts on the brake member 710 to drive the brake member 710 to reset to the release state.

In one embodiment, the brake 710 is a magnetic brake, and in the released state, the brake 710 releases the push-pull module 1; in the braking state, the braking member 710 locks the push-pull module 1 by magnetic attraction.

Referring to fig. 18-25, in one embodiment, a first mating region 201 defines a first nut receiving region in a radial direction of the nut 100, and a second mating region 202 defines a second nut receiving region in a radial direction of the nut 100, wherein a length of the first nut receiving region in the radial direction is greater than that of the second nut receiving region, the first nut receiving region is capable of separating the nut 100 disposed therein from the screw 1000, and the second nut receiving region is capable of maintaining the nut 100 disposed therein in engagement with the screw 1000.

Referring to fig. 18-25, in one embodiment, the distance between the first mating region 201 and the rotation center of the state switching member 200 is greater than the distance between the second mating region 202 and the rotation center of the state switching member 200; or the first mating region 201 is a notch reserved on the state switch 200.

Referring to fig. 18-25, in one embodiment, the state switching driving member 221 includes a motor, and the motor is in driving connection with the state switching member 200 to drive the state switching member 200 to rotate.

In another aspect, the present application also provides another medical fluid filling device. Referring to fig. 18 and 19, the medical fluid filling device includes a housing 10, a filling driving module 2, a push-pull module 1, a limit detection module 3, a control unit 4, and the like.

The housing 10 has a syringe placement area for placement of a syringe. Some structures for fixing the syringe may be provided in the syringe placement area, referring to the prior art. The priming drive module 2 is used to provide a priming drive force, wherein the priming drive module 2 has a priming drive 21 and a transmission assembly 22. The filling driving member 21 is connected with a transmission assembly 22, and the power provided by the filling driving member is transmitted to the push-pull module 1 through the transmission assembly 22. Referring to fig. 19, the priming drive 21 may employ a motor or other various drive structures capable of providing priming drive power for the medical fluid priming device. The motor is connected with the screw 1000 through a synchronous belt structure 23, and the synchronous belt transmission structure comprises a driving wheel connected with the motor, a synchronous belt and a driven wheel connected with the screw 1000.

The transmission assembly 22 is connected with the push-pull module 1, and the push-pull module 1 is used for pushing a push handle of the injector to move so as to fill liquid. For example, in fig. 19, the push-pull module 1 can move laterally in the drawing, and when moving outward (upper right corner of drawing), the size of the syringe placement area can be enlarged, facilitating placement of the syringe. When moved inwardly (upper left corner of the drawing) the push-pull module 1 can be brought into contact with the push handle of the syringe, thereby applying pressure to the syringe and filling the syringe with liquid.

Specifically, referring to fig. 19, the push-pull module 1 includes a module housing 11 and a clip 12. The grip clamp 12 can be opened and closed by manual or mechanical means to clamp and unclamp the push handle of the syringe. The capture clip 12 includes a first capture clip and a second capture clip that cooperate with each other. The push-pull module 1 is connected to the transmission assembly 22 via a connecting rod 13, in particular in conjunction with the nut 100, so that the nut 100 can move the push-pull module 1 laterally.

The transmission assembly 22 has a first connection state and a second connection state, when the transmission assembly 22 is in the first connection state, the filling driving module 2 is in linkage with the push-pull module 1, and the push-pull module 1 is in an active state and can be far away from and close to the syringe placement area under external force; when the transmission assembly 22 is in the second connection state, the filling driving module 2 is linked with the push-pull module 1, and the push-pull module 1 can be driven to move by the filling driving module 2, at this time, an operator cannot drive the push-pull module 1 to push the push handle of the syringe through external force. Typically, when loading the syringe, the drive assembly 22 is in the first connected state. During priming of the medical fluid filling device, the transmission assembly 22 is in the second connected state.

In general, when an operator loads the syringe, the push-pull module 1 is pulled out first, after the syringe is put in, the push-pull module 1 is pushed to move inwards, and the push handle of the syringe is contacted and driven to pressurize the syringe together, so that air in the syringe is discharged. In order to ensure that the push handle of the syringe can be in an accurate loading limit position. The embodiment also provides a limit detection module 3, which is used for detecting whether the push handle and/or the push-pull module 1 reaches a loading limit position, namely, the limit detection module 3 can detect the position of the push handle and also can detect the position of the push-pull module 1, so that the detection on whether the push handle moves to the loading limit position is realized. The detection push-pull module 1 can adopt, but is not limited to, various position detection structures, such as photoelectric sensors, pressure sensors, touch switches, hall switches and the like.

The filling driving module 2, the transmission assembly 22 and the limit detection module 3 are electrically connected with the control unit 4, when the transmission assembly 22 is in a first connection state, the control unit 4 can control the transmission assembly 22 to be switched into a second connection state and/or lock the push-pull module 1 when the limit detection module 3 detects that the push handle and/or the push-pull module 1 reaches a loading limit position, and an operator cannot manually control the push-pull module 1 at this time so as to prevent the push-pull module 1 from continuously pressurizing the push handle under external force, and ensure that unexpected solutions are not caused when the injector is loaded. .

Referring to fig. 20-25, in one embodiment, transmission assembly 22 includes a screw 1000 and a nut 100, with screw 1000 being coupled to filling drive 21. A linkage structure is arranged between the screw nut 100 and the push-pull module 1, the screw nut 100 is provided with a matching surface 110 in threaded fit with the screw rod 1000, and the matching surface 110 can move along the direction approaching to and separating from the screw rod 1000; in the second connection state, the nut 100 is engaged with the screw 1000; when the state switching member 200 is in the first connection state, the nut 100 is separated from the screw 1000.

Further, with continued reference to fig. 20-25, in one embodiment, the transmission assembly 22 includes a state switch drive 221 and a state switch 200. The state switching member 200 is rotatably arranged at the outer side of the nut 100, the state switching driving member 221 is connected with the state switching member 200 to drive the state switching member 200 to rotate around the state switching member 200, the inner wall of the state switching member 200 is provided with a first matching region 201 and a second matching region 202 which can be contacted with the outer wall of the nut 100, and the first matching region 201 and the second matching region 202 are arranged along the circumferential direction of the state switching member 200; when the transmission assembly 22 is in the first connection state, the first matching region 201 is in contact with the screw 100, and the matching surface 110 is far away from the screw 1000; when the transmission assembly 22 is in the second connection state, the outer wall of the screw 100 is in contact with the second mating region 202, and the mating surface 110 is in threaded engagement with the screw 1000. In the drawing, the state switching driving member 221 includes a motor, which is drivingly connected to the state switching member 200 to drive the state switching member 200 to rotate. Of course, the state switching driving member 221 may be replaced with another driving member capable of providing power.

Further, referring to fig. 20-25, in one embodiment, the first mating region 201 defines a first nut receiving region in a radial direction of the nut 100, the second mating region 202 defines a second nut receiving region in a radial direction of the nut 100, the second nut receiving region is capable of maintaining the nut 100 disposed therein in engagement with the screw 1000, the first nut receiving region has a length in the radial direction greater than the second nut receiving region, and the first nut receiving region is capable of separating the nut 100 disposed therein from the screw 1000.

Further, referring to fig. 34, in one embodiment, the distance between the first mating region 201 and the rotation center of the state switching member 200 is greater than the distance between the second mating region 202 and the rotation center of the state switching member 200; or referring to fig. 21, the first mating region 201 is a notch reserved on the status switch 200.

Further, with continued reference to fig. 20-25, in one embodiment, the push-pull module further includes a brake module 700, the brake module 700 having a brake 710, and locking the push-pull module 1 includes directly or indirectly locking the brake 710 to the push-pull module 1 to prevent the push-pull module 1 from continuing to pressurize the push handle under external force. The direct locking means that the brake member 710 directly acts on and locks the push-pull module 1, and the indirect locking means that the brake member 710 indirectly makes the push-pull module 1 unable to move through other structures connected with the push-pull module 1.

Further, with continued reference to fig. 18, in one embodiment, the brake 710 is controlled by the control unit 4 to drive the brake 710 to switch from the unlocked state to the braked state and/or the braked state to switch from the unlocked state.

Further, referring to fig. 20-25, in one embodiment, the state switching member 200 and the braking member 710 form a linkage structure to drive the braking member 710 to switch from the unlocked state to the braking state. The state or the movement trace of the state switching member 200 can drive the state of the braking member 710 to change.

Further, referring to fig. 20-25, in one embodiment, the state switching member 200 has a brake driving portion 220, the brake module 700 has a triggering structure 730, the triggering structure 730 is disposed on a rotation path of the brake driving portion 220, and when the brake driving portion 220 rotates to the triggering structure 730, the triggering structure 730 can be triggered to switch the brake member 710 to a braking state.

Further, referring to fig. 21, in one embodiment, the inner wall of the state switching member 200 has a brake engagement region 203, the brake engagement region 203 is located between the first engagement region 201 and the second engagement region 202, and when the brake driving portion 220 drives the brake member 710 to switch to the braking state, the brake engagement region 203 abuts against the nut 100, and the nut 100 is engaged with or separated from the screw 1000.

In this embodiment, referring to fig. 21, when the state switching member 200 rotates counterclockwise, the state switching member transitions through the brake engagement region 203 before the nut 100 is not fully opened (i.e., before the nut 100 moves to the first engagement region 201 of the state switching member 200). Thereafter, when the state switching member 200 is rotated clockwise, before the nut 100 is completely closed (i.e., before the second engagement region 202 of the state switching member 200 is in contact with the nut 100), the state switching member is first transitioned through the brake engagement region 203 to achieve braking, and then gradually transitioned to the completely engaged state of the nut 100 and the screw 1000. Through the transition of the brake matching area 203, the variation of the nut 100 between the first matching area 201 and the second matching area 202 is smoother, so that the situation that the drop at the transition joint of the first matching area 201 and the second matching area 202 is large, the nut 100 pops up and varies greatly, noise is easy to generate, and the nut 100 is easy to damage can be avoided.

Further, the brake module 700 resists movement of the push-pull module 1, and the brake 710 may be embodied as a rubber brake pad, in friction with adjacent machinery.

Specifically, referring to fig. 22 and 23, in one embodiment, the brake 710 is a friction type brake, in the unlocked state, the brake 710 releases the push-pull module 1, and in the braked state, the brake 710 locks the push-pull module 1.

Further, with continued reference to fig. 22 and 23, in one embodiment, the brake module 700 includes a release state resetting member 730, such as a spring or the like. The release state resetting member 730 acts on the brake 710 to drive the brake 710 to be reset to the release state.

In fig. 22 and 23, the movement of the push-pull module 1 is impeded by the rotational movement of the state switch 200, such that the spring compression drives the brake module 700 to an adjacent mechanical movement.

Further, in one embodiment, the brake 710 is a magnetic type brake, and in the braking state, the brake 710 locks the push-pull module 1 through magnetic attraction.

Specifically, the brake 710 may be embodied as a magnet brake pad, and is mechanically attracted to the adjacent metal; the brake 710 may also be embodied as a metallic brake pad that mechanically attracts the magnets adjacent thereto.

Referring to fig. 26-40, the following describes the structure of the medical fluid filling device in a more specific embodiment.

As shown in fig. 26, an embodiment of the present utility model provides a nut opening and closing structure, which includes a screw 1000, a nut 100 and a state switching member 200. Wherein, the screw 100 is provided with a matching surface 110 for being in threaded fit with the screw 1000, and the part of the screw 100 where the matching surface 110 is arranged can move along the direction approaching to and separating from the screw 1000; the state switching member 200 is disposed outside the nut 100, and the inner wall of the state switching member 200 has a first mating region 201 and a second mating region 202 that mate or contact with the outer wall of the nut 100, where the first mating region 201 and the second mating region 202 are arranged along the circumferential direction of the state switching member 200; in a state where the outer wall of the nut 100 is in contact with the first fitting region 201, the fitting surface 110 is away from the screw 1000; the engagement surface 110 is screw-engaged with the screw 1000 in a state where the outer wall of the screw 100 is in contact with the second engagement region 202.

According to the nut opening and closing structure provided by the embodiment of the utility model, the state switching piece 200 is arranged on the outer side of the nut 100, the first matching area 201 and the second matching area 202 are arranged along the circumferential direction of the state switching piece 200, and the switching between the state that the outer wall of the nut 100 is contacted with the first matching area 201 and the state that the outer wall of the nut 100 is contacted with the second matching area 202 can be realized through the rotating drum of the state switching piece 200. In a state that the outer wall of the nut 100 is in contact with the first matching area 201, the matching surface 110 is far away from the screw rod 1000, so that the nut 100 and the screw rod 1000 can be separated, and the requirement of rapid injection is met. In a state where the outer wall of the nut 100 is in contact with the second fitting region 202, the fitting surface 110 is screw-fitted with the screw 1000 so that the nut 100 is engaged with the screw 1000. Because the second matching area 202 is a part of the inner wall of the state switching member 200, in this state, the movement of the nut 100 along the radial direction of the state switching member 200 is limited by the self strength of the state switching member 200, and when the syringe pump accidentally falls or receives other impacts, the position movement of the nut 100 is effectively avoided, and the situation that the matching surface 110 is separated from the screw rod 1000 is avoided, so that the situation of excessive injection is avoided, and the use safety is effectively improved.

In order to improve the fit stability of the nut 100 and the screw 1000 as much as possible, the number of the nuts 100 is plural and arranged along the circumferential direction of the screw 1000; the state switching member 200 is disposed outside the plurality of nuts 100, wherein the outer walls of the plurality of nuts 100 are in contact with the first mating region 201, and the outer walls of the plurality of nuts 100 are in contact with the second mating region 202. That is, in a state where the outer wall of any one of the nuts 100 is in contact with the first fitting region 201, the outer walls of the remaining nuts 100 are all in contact with the first fitting region 201, and in this state, the fitting surfaces 110 of the plurality of nuts 100 are away from the screw 1000, so that all the nuts 100 are separated from the screw 1000. In a state where the outer wall of any one of the nuts 100 is in contact with the second fitting region 202, the outer walls of the remaining nuts 100 are in contact with the second fitting region 202, and in this state, the fitting surfaces 110 of the plurality of nuts 100 are screw-fitted with the screw 1000 so that all the nuts 100 are engaged with the screw 1000. It will be appreciated that the centers of the mating surfaces 110 of the plurality of nuts 100 coincide in a state where the mating surfaces 110 of the plurality of nuts 100 are screw-engaged with the screw 1000.

In order to facilitate layout and arrangement, the matching stability of the plurality of nuts 100 and the screw rod 1000 is improved, the inner wall of the state switching member 200 is provided with a plurality of inner wall section groups, and each inner wall section group comprises a first matching area 201 and a second matching area 202; the plurality of nuts 100 are in one-to-one correspondence with the plurality of sets of inner wall segments. In this embodiment, the plurality of inner wall segment groups are uniformly distributed along the inner circumference of the state switching member 200, so as to realize a structure in which the first matching region 201 and the second matching region 202 are arranged in a crossing manner.

For simplicity of construction, the number of nuts 100 is two and symmetrically disposed with respect to the screw 1000.

As shown in fig. 32, in the nut opening and closing structure provided by the embodiment of the utility model, the nut opening and closing structure further comprises an inner cylinder 300, wherein an installation groove 320 penetrating through the inner wall and the outer wall of the inner cylinder 300 is formed in the inner cylinder 300, and all or part of the nut 100 is embedded into the installation groove 320; the state switching member 200 is provided outside the inner cylinder 300 and is rotatable with respect to the inner cylinder 300. By providing the inner cylinder 300, structural stability is effectively improved. The inner cylinder 300 may be fixedly connected with a slider 500 driving the syringe to inject. The slider 500 slides in the axial direction of the screw 1000.

Of course, the inner cylinder 300 may be omitted, and the nut 100 and the state switching member 200 may be directly axially positioned (for example, an axial positioning member for limiting the axial movement of the nut 100 and the state switching member 200 and not limiting the rotation of the state switching member 200 may be provided on the housing of the syringe pump or the slider 500 for driving the syringe to inject). In a state that the engagement surface 110 of the nut 100 is in threaded engagement with the screw 1000, the state switching member 200 is rotated and the state switching member 200 is axially positioned with respect to the screw 1000, so that the state switching member 200 can be rotated with respect to the nut 100, and switching between a state that the outer wall of the nut 100 is in contact with the first engagement region 201 and a state that the outer wall of the nut 100 is in contact with the second engagement region 202 can be realized.

The nut 100 may also be circumferentially positioned relative to the screw mandrel 1000 (for example, a casing of an injection pump or a sliding block 500 driving an injector to inject is provided with a circumferential positioning component for limiting circumferential movement of the nut 100), and when the state switching member 200 rotates circumferentially relative to the screw mandrel 1000, rotation of the state switching member 200 relative to the nut 100 may be achieved.

The state switching member 200 in this embodiment is provided with a rotation guide groove extending along the circumferential direction of the state switching member 200, and the outer wall of the nut 100 is further provided with a rotation guide block slidably engaged with the rotation guide groove. During the rotation of the state switching member 200, the rotation guide block can move in the extending direction of the rotation guide groove.

As shown in fig. 33, the rotation center portion of the nut 100 is rotatably provided on the inner cylinder 300 through the rotation shaft 130; the portion where the mating surface 110 is provided is the non-rotational center portion of the nut 100. That is, the rotation shaft 130 and the mating surface 110 are respectively disposed, and the movement of the portion of the screw 100 where the mating surface 110 is disposed in the direction approaching and separating from the screw 1000 is realized by the rotation of the screw 100 along the rotation shaft 130. Of course, an elastic connection member may be provided to connect the nut 100 with the screw 1000 or the inner cylinder 300, and the elastic force of the elastic connection member may enable the portion of the nut 100 where the mating surface 110 is disposed to move in a direction approaching to and separating from the screw 1000. Under the rotation action of the state switching member 200, the outer wall of the nut 100 contacts with the first matching area 201 and the second matching area 202, so that a force can be applied to the nut 100, and the position where the matching surface 110 is arranged moves along the direction approaching to and separating from the screw rod 1000.

As shown in fig. 33, one end of the nut 100 is a portion where the mating surface 110 is provided, the other end of the nut 100 is a reset member positioning portion 140, and a rotation center portion (rotation shaft 130) of the nut 100 is located between one end and the other end of the nut 100. In order to facilitate control, the nut opening and closing structure further includes a reset element 600 for resetting the inner cylinder of the reset element positioning portion 140, and the mating surface 110 is far away from the screw 1000 in a state that the reset element positioning portion 140 is reset relative to the inner cylinder 300.

Preferably, the axis of the rotating shaft 130 is perpendicular to the axis of the inner cylinder 300; in this state, the restoring member 600 is an elastic ring sleeved outside the restoring member positioning portion 140. In the embodiment with multiple nuts 100, the elastic ring is sleeved outside the reset element positioning portion 140 of the multiple nuts 100. In the embodiment with one nut 100, the elastic ring is sleeved outside the reset element positioning portion 140 of one nut 100, and other parts, such as the state switching element 200 or the inner cylinder 300, with respect to which the reset element positioning portion 140 moves, are sleeved in the elastic ring. The restoring member positioning portion 140 is moved toward the center of the screw shaft by the elastic contractive force of the elastic ring, and the mating surface 110 is moved away from the screw shaft.

The restoring member 600 may be provided as a spring, a rubber block, or the like, and the restoring member positioning portion 140 may be moved toward the center of the screw by the elastic restoring force thereof.

Further, the inner cylinder 300 further includes a protective frame 310 mounted on the mounting groove 320 for placing the nut 100 out of the inner cylinder 300. The protection frame 310 may be fixedly connected with the slider 500 for driving the syringe to inject.

The outer wall of the nut 100 has a guide surface 1212 that guides the movement of the nut 100 from the first mating segment 201 to the second mating segment 202. As shown in fig. 33, in this embodiment, the guide surface 1212 is an inclined surface.

The nut opening and closing structure provided by the embodiment of the utility model further comprises a driving assembly for driving the state switching piece 200 to circumferentially rotate.

As shown in fig. 34, in order to facilitate the circumferential rotation of the driving state switching member 200, the outer wall of the state switching member 200 has a gear tooth portion 210; the driving assembly includes a driving gear engaged with the gear tooth part 210 and a driving device for driving the driving gear to rotate.

As shown in fig. 34 and 35, in the first embodiment, the gear teeth 210 are sector gear teeth, and the driving gear may be a complete gear 800.

The drive gear may also be a gear with sector gear teeth.

As shown in fig. 39 and 40, in the second embodiment, the gear teeth 210 are gear rings provided along the circumferential direction of the state switching member 200, and the driving gear may be a sector gear 900.

The drive gear may also be a complete gear.

In order to increase the degree of automation, the drive means is a rotating electrical machine. The rotation of the rotary motor drives the driving gear to rotate, and then drives the state switching member 200 to circumferentially rotate.

The drive means may also be a torsion bar which is manually rotatable. By manually rotating the torsion bar, the rotation of the driving gear is realized, and the state switching member 200 is driven to circumferentially rotate.

The state switching piece 200 can also be used as a driven wheel, the driving end of the driving device is provided with a driving wheel, and the driving wheel is connected with the driven wheel through a chain or a transmission belt.

The driving assembly can be set to be of other structures, and only the driving state switching member 200 is required to be driven to rotate circumferentially, so that the driving assembly is not tired one by one and is within a protection range.

The nut opening and closing structure provided by the embodiment of the utility model further comprises a nut closing retainer 400 for enabling the outer wall of the nut 100 to be in positioning contact with the second matching area 202. By the screw closure holder 400, the outer wall of the screw 100 is ensured to be in positioning contact with the second matching area 202, so that the stability of the threaded matching of the screw 100 and the screw rod 1000 is ensured, and the operation stability of the injection pump is further improved.

The screw closure retainer 400 is a torsion spring, and the torsion spring is sleeved on the outer side of the screw 1000; one end of the torsion spring is a positioning end for abutting against the slider 500 of the syringe pump, and the other end of the torsion spring abuts against the non-axial center portion of the state switching member 200. As shown in fig. 30, one end of the state switching member 200 has a boss 230, a through hole for the screw rod 1000 to pass through is provided in the center of the boss 230, a positioning edge 240 is further provided on the outer side of the boss 230, and a torsion spring is sleeved on the outer side of the boss 230 and located between the boss 230 and the positioning edge 240. The other end of the torsion spring abuts against the locating edge 240.

The utility model also provides a medical liquid filling device, which comprises a pump body, a sliding block 500 for driving the injector to inject, and any screw opening and closing structure.

Since the above-mentioned screw opening and closing structure has the above-mentioned technical effects, the syringe pump having the above-mentioned screw opening and closing structure should have the same technical effects, and will not be described in detail herein.

Further, in order to improve stability, the state switching member 200 of the screw open-close structure and the slider 500 are positioned along the axial direction of the screw 1000 of the screw open-close structure.

In this embodiment, the slider 500 is fixedly connected with the inner cylinder 300 of the nut opening and closing structure. The protective frame 310 of the inner cylinder 300 is fixedly connected with the slider 500.

The medical liquid filling device provided by the embodiment of the utility model further comprises a bolus structure arranged in the pump body, wherein the pressing end of the brake module 700 of the bolus structure faces the state switching piece 200; the outer wall of the state switching member 200 has a brake driving part 220, and the brake driving part 220 can press the pressing end of the brake module 700 under the rotation of the state switching member 200.

In another aspect, an embodiment of the present application further provides a medical fluid filling device that can lock the push-pull module 1 solely by the brake module 700 to prevent the push-pull module 1 from continuing to pressurize the push handle under external force.

The medical fluid filling device comprises a push-pull module 1 and a brake module 700. The push-pull module 1 is used for pushing the push handle of the injector to move so as to fill liquid. The brake module 700 has a brake 710, the brake 710 having an unlocked state and a braked state in which the brake module 700 locks the push-pull module 1 to prevent the push-pull module 1 from moving under an external force of an operator; in the unlocked state, the brake 710 releases the push-pull module 1.

The medical fluid filling device comprises a shell 10, a filling driving module 2, a push-pull module 1, a brake module 700, a control unit 4 and the like. In addition to the differences of the present embodiment, other structures may be referred to the structures shown in the above embodiments.

The housing 10 has a syringe placement area for placement of a syringe. The filling driving module 2 is used for providing filling driving force, the filling driving module 2 is provided with a filling driving piece 21 and a transmission assembly 22, and the filling driving piece 21 is connected with the transmission assembly 22. The transmission assembly 22 is connected with the push-pull module 1, and the push-pull module 1 is used for pushing a push handle of the injector to move so as to fill liquid; the transmission assembly 22 has a first connection state and a second connection state, when the transmission assembly 22 is in the first connection state, the filling driving module 2 is in linkage with the push-pull module 1, and the push-pull module 1 is in an active state and can be far away from and close to the syringe placement area under external force; when the transmission assembly 22 is in the second connection state, the filling driving module 2 is linked with the push-pull module 1, and the push-pull module 1 can move under the driving of the filling driving module 2.

Referring to fig. 20-25, the brake module 700 has a brake member 710, the brake member 710 has an unlocked state and a braked state, and in the braked state, the brake module 700 locks the push-pull module 1 to prevent the push-pull module 1 from continuously pressing the push handle under an external force; in the unlocked state, the brake 710 releases the push-pull module 1. The filling driving module 2, the transmission assembly 22 and the limit detection module 3 are electrically connected.

The brake module 700 has a brake manual trigger coupled to the brake 710, and the brake manual trigger is capable of driving the brake 710 to switch from an unlocked state to a braked state. The manual trigger piece for braking can be a structure with triggering functions of various entity keys, touch switches, deflector rods, pull ropes, swing rods and the like.

Alternatively, in one embodiment, the brake module 700 is connected to the control unit 4, and the control unit 4 drives the brake 710 to switch from the unlocked state to the braked state and/or the braked state to switch from the unlocked state. This approach may be as shown in the embodiments described above.

In one embodiment, the device further comprises a limit detection module 3. The limit detection module 3 is electrically connected with the control unit 4, and the limit detection module 3 is used for detecting whether the push handle and/or the push-pull module 1 reach the loading limit position; when the control unit 4 knows that the push handle and/or the push-pull module 1 reaches the loading limit position, the brake 710 is controlled to switch from the unlocking state to the braking state.

In one embodiment, the device further comprises a manual trigger for braking; the manual brake trigger is electrically connected with the control unit 4, and the manual brake trigger can input a brake signal to the control unit 4, and the control unit 4 controls the brake 710 to switch from the unlocking state to the braking state according to the brake signal.

The brake module 700 can quickly stop the syringe loading motion when needed. The selection of the brake module 700 may be described with reference to the above embodiments.

In another aspect, an embodiment of the present application also provides a medical fluid filling device that can simultaneously drive the closing and opening of the nut 100 and the state of the brake module 700 by the same set of driving structures. In this embodiment, two locking functions to the push-pull module 1 can be integrated at the same time, and the system integration level is improved.

Referring to fig. 19 to 25, the medical fluid filling device includes a push-pull module 1, a screw 1000, a nut 100, a brake module 700, a status switching member 200, and the like. In addition to the differences of the present embodiment, other structures may be referred to the structures shown in the above embodiments.

The push-pull module 1 is used for driving a push handle of the injector to move so as to fill liquid. Screw 1000 is adapted to be connected to a priming drive 21 for inputting priming power. The nut 100 is connected with the push-pull module 1 to drive the push-pull module 1 to pressurize the injector; nut 100 has a mating surface 110 that threadably engages screw 1000, with mating surface 110 being movable in a direction toward and away from screw 1000. The brake module 700 has a brake 710, and the brake 710 can lock and release the push-pull module 1 to prevent and release the push-pull module 1 from moving under the external force of an operator. The state switching member 200 forms a linkage structure with the nut 100 and the brake member 710, the nut 100 switches the engagement state with the screw 1000 based on the movement of the state switching member 200, and the brake member 710 switches the action state with the push-pull module 1 based on the movement of the state switching member 200.

In one embodiment, the device further comprises a state switching driving member 221, wherein the state switching driving member 221 is connected with the state switching member 200 to drive the state switching member 200 to rotate around the nut 100.

The push-pull module 1 is used for pushing the push handle of the injector to move so as to fill liquid. Screw 1000 is adapted to be connected to a priming drive 21 for inputting priming power. The nut 100 is connected with the push-pull module 1 to drive the push-pull module 1 to pressurize the injector; nut 100 has a mating surface 110 that threadably engages screw 1000, with mating surface 110 being movable in a direction toward and away from screw 1000. The brake module 700 has a brake 710, and the brake 710 directly or indirectly locks the push-pull module 1 to prevent the push-pull module 1 from being pressurized to the push handle by an external force.

The state switching driving member 221 is used for providing power for switching different states of the nut 100 and the brake member 710. The state switching driving member 221 is connected with the state switching member 200 to drive the state switching member 200 to change the engagement state of the nut 100 and the screw 1000 and change the acting state of the brake member 710 and the push-pull module 1. The engagement of nut 100 with screw 1000 includes disengagement and engagement of the two. The action state of the brake 710 and the push-pull module 1 includes the brake 710 locking the push-pull module 1 and the disengagement of the two.

Referring to fig. 19-25, in one embodiment, the state switching member 200 is rotatably disposed outside the nut 100, the state switching driving member 221 drives the state switching member 200 to rotate around the state switching member 200, the inner wall of the state switching member 200 has a first mating region 201 and a second mating region 202 capable of contacting with the outer wall of the nut 100, and the first mating region 201 and the second mating region 202 are arranged along the circumferential direction of the state switching member 200; when first mating field 201 is in contact with nut 100, mating surface 110 is away from lead screw 1000; mating surface 110 engages lead screw 1000 when the outer wall of nut 100 contacts second mating segment 202.

Referring to fig. 19-25, in one embodiment, a first mating region 201 defines a first nut receiving region in a radial direction of the nut 100, a second mating region 202 defines a second nut receiving region in the radial direction of the nut 100, the second nut receiving region is capable of maintaining the nut 100 disposed therein in engagement with the screw 1000, the first nut receiving region has a length in the radial direction greater than the second nut receiving region, and the first nut receiving region is capable of separating the nut 100 disposed therein from the screw 1000.

Referring to fig. 19-25, in one embodiment, the distance between the first mating region 201 and the rotation center of the state switching member 200 is greater than the distance between the second mating region 202 and the rotation center of the state switching member 200; or the first mating region 201 is a notch reserved on the state switch 200.

Referring to fig. 19-25, in one embodiment, the device further comprises an inner cylinder, wherein a mounting groove penetrating through the inner wall and the outer wall of the inner cylinder is formed in the inner cylinder, and the nut 100 is embedded in the mounting groove; the state switching member 200 is provided outside the inner cylinder and is rotatable with respect to the inner cylinder.

Referring to fig. 19-25, in one embodiment, the state switching member 200 and the braking member 710 form a linkage structure to drive the braking member 710 to switch from the unlocked state to the braking state.

Referring to fig. 19-25, in one embodiment, the state switching member 200 has a brake driving portion 220, the brake module 700 has a triggering structure 730, the triggering structure 730 is disposed on a rotation path of the brake driving portion 220, and when the brake driving portion 220 rotates to the triggering structure 730, the triggering structure 730 can be triggered to switch the brake member 710 to a braking state.

Referring to fig. 19-25, in one embodiment, the inner wall of the state switching member 200 has a brake engagement region 203, the brake engagement region 203 is located between the first engagement region 201 and the second engagement region 202, and when the brake driving portion 220 drives the brake member 710 to switch to the braking state, the brake engagement region 203 abuts against the nut 100, and the nut 100 is engaged with or separated from the screw 1000.

Referring to fig. 19-25, in one embodiment, the brake 710 is a friction type brake 710, and in an unlocked state, the brake 710 releases the push-pull module 1, and in a braked state, the brake 710 locks the push-pull module 1.

Referring to fig. 19-25, in one embodiment, the brake module 700 includes a release state resetting member 730, and the release state resetting member 730 acts on the brake 710 to drive the brake 710 to reset to the release state.

Referring to fig. 19-25, in one embodiment, the brake 710 is a magnetic brake 710, and in a braking state, the brake 710 locks the push-pull module 1 by magnetic attraction.

Referring to fig. 19-25, in one embodiment, the state switching driving member 221 includes a motor, and the motor is in driving connection with the state switching member 200 to drive the state switching member 200 to rotate.

Referring to fig. 19-25, in one embodiment, the apparatus further includes a control unit 4, where the control unit 4 is connected to the state switching driving member 221, and the position of the state switching member 200 is controlled by the control unit 4.

Referring to fig. 19-25, in one embodiment, the device further includes a manual trigger, which is connected to the state switch driving member 221, and the position of the state switch member 200 is controlled by the manual trigger.

In another aspect, an embodiment of the present application further provides a syringe loading method applied to a medical fluid filling device, including:

Enlarging a syringe placement area to place the syringe;

changing the position of the push-pull module 1 to push the push handle of the injector to pressurize the injector;

detecting whether the push handle and/or the push-pull module 1 reach a loading limit position; if so, the filling driving device is controlled to be connected with the push-pull module 1 or the push-pull module 1 is locked so as to prevent the push-pull module 1 from pressurizing the push handle under external force.

More specifically, workflow details describe: the method comprises the steps of pinching a pinching handle of a push-pull module 1 by a hand, opening a mechanical/electric driving grabbing clamp 12, opening a mechanical/electric driving screw 100, loosening a mechanical/electric driving brake 710, opening the push-pull module 1 to the maximum by the hand, installing a syringe by the hand, pinching the pinching handle of the push-pull module 1 by the hand, opening the mechanical/electric driving grabbing clamp 12, opening the mechanical/electric driving screw 100, loosening the mechanical/electric driving brake, retracting the push-pull module 1 by the hand, enabling the pushing handle of the syringe to contact a contact (detected by a limit detection module 3) of the push-pull module 1 in the retracting process, closing the mechanical/electric driving brake 710, closing the mechanical/electric driving screw 100, clamping the pushing handle by the grabbing clamp 12, and completing the installation and loading of the syringe.

The foregoing description of the utility model has been presented for purposes of illustration and description, and is not intended to be limiting. Several simple deductions, modifications or substitutions may also be made by a person skilled in the art to which the utility model pertains, based on the idea of the utility model.

Claims

1. The injector driving device is characterized by comprising a push-pull module, a sliding block assembly, a screw rod, a filling driving piece and a connecting rod;

2. The injector drive arrangement of claim 1, wherein the slider assembly further comprises a first reset member that applies a restoring force to the nut;

3. The injector drive arrangement of claim 1, wherein the state switching member has a first mating region and a second mating region, the first mating region and the second mating region being located outside of the nut and distributed circumferentially around the state switching member; the nut is provided with an abutting part facing the state switching piece, and the abutting part and the matching surface are respectively arranged on the opposite sides of the nut;

4. The injector drive arrangement of claim 3, wherein the first mating section defines a first nut receiving section and the second mating section defines a second nut receiving section, the first nut receiving section having a greater radial movement of the screw than the second nut receiving section; when the state switching piece is positioned at the disengaging position, the screw is positioned in the first screw accommodating area and is disengaged from the screw rod; when the state switching piece is positioned at the engagement position, the screw is positioned in the second screw accommodating area and engaged with the screw rod.

5. A syringe driving apparatus as claimed in claim 3, wherein the abutment portion of each screw includes a first abutment portion and a second abutment portion, the second abutment portion being aligned with the first abutment portion in the axial direction of the screw and located on the same side of the screw; the first fit region and the second fit region are respectively provided with a first sub fit region and a second sub fit region, the first sub fit region is used for being matched with a first abutting part of a corresponding screw nut, and the second sub fit region is used for being matched with a second abutting part of the corresponding screw nut;

6. The injector drive arrangement as recited in claim 5, wherein the first abutment has a first force bearing surface for bearing the state switch pressure and the second abutment has a second force bearing surface for bearing the state switch pressure, the second force bearing surface having an area greater than an area of the first force bearing surface.

7. The syringe drive arrangement of claim 5, wherein the first abutment and the second abutment are each provided in a convex manner.

8. A syringe drive arrangement as claimed in claim 3, wherein the abutment of each nut comprises a first abutment at the end of the nut, the first and second mating areas each having a first sub-mating area for mating with the first abutment of a corresponding nut;

9. A syringe driving apparatus as claimed in claim 3, wherein the abutment portion of each nut includes a second abutment portion having a set distance from an end of the nut, the first and second mating regions each having a second sub-mating region for mating with the second abutment portion of the corresponding nut;

10. The injector drive arrangement as recited in any one of claims 5-9, wherein the state switching member has an inner wall disposed circumferentially therealong, the first sub-mating region of the first mating region and the first sub-mating region of the second mating region being different regions of the inner wall.

11. The syringe driving apparatus as set forth in claim 10, wherein the first sub-engagement areas of the first engagement area are equidistant from the rotational center line of the state switching member throughout a cross section perpendicular to the rotational center line of the state switching member;

12. The injector drive arrangement as set forth in claim 10, wherein a first sub-engagement region of said first engagement region has a first gradation section having oppositely disposed first and second ends in a cross section perpendicular to a rotational center line of said state switching member, a first abutment entering said first gradation section from its first end and moving along said first gradation section toward its second end during movement of said state switching member from said engaged position toward said disengaged position, said first gradation section gradually increasing in distance from its first end toward its second end throughout said rotational center line of said state switching member;

13. The injector driver according to any of claims 5-9, wherein the second sub-engagement region of the first engagement region has a relief opening or recess for the second abutment of the corresponding nut to extend;

14. A syringe driving apparatus as claimed in claim 3, wherein at least one of said abutment portions on each nut has a guide surface disposed facing said state switching member, said guide surface having oppositely disposed first and second ends in a cross section perpendicular to a rotational center line of said state switching member, said first end of said guide surface being in contact with said second mating region during movement of said state switching member from said disengaged position to said engaged position, said guide surface being progressively larger in distance from said first end of said guide surface to said second end of said guide surface throughout said rotational center line of said state switching member.

15. The syringe actuation arrangement of claim 1, further comprising a screw closure holder that acts on the state switching member and applies a restoring force to the state switching member to drive the state switching member toward the engaged position.

16. The injector drive arrangement of claim 15, wherein the slider assembly further comprises a slider fixedly connected to the connecting rod, the nut and the state switching member being mounted on the slider, and the state switching member being rotatable on the slider; the screw closing retaining member is a torsion spring, the torsion spring surrounds the screw rod, one end of the torsion spring is installed on the sliding block, and the other end of the torsion spring is installed on the state switching member.

17. The injector drive arrangement of claim 1, wherein the slider assembly further comprises an inner barrel having a central through bore and at least one mounting slot extending radially through a sidewall of the central through bore along the inner barrel, the lead screw extending through the central through bore, the nut being embedded in the mounting slot; the state switching piece is arranged on the outer side of the inner cylinder and can rotate relative to the inner cylinder.

18. The injector driver of claim 17, wherein the threaded nut has the mating surface at one end and a reset member positioning portion at the other end, the reset member positioning portion having a first reset member, the first reset member applying a force to the reset member positioning portion to drive the mating surface away from the threaded nut.

19. The syringe drive arrangement of claim 18 wherein said nut is rotatably coupled to said inner barrel and said first return member collar is sleeved over said inner barrel and said return member positioning portion to apply a force to said return member positioning portion.

20. The injector drive arrangement as recited in claim 1, wherein the slider assembly further comprises a status detection module, the status switch having a detected portion, the status detection module being disposed in a rotational path of the detected portion, the status detection module being triggered by the detected portion to obtain a detection signal.

21. The injector drive arrangement of claim 3, wherein the slider assembly further comprises a brake module for locking the movement of the push-pull module, the state switch having a brake position during rotation of the state switch; the state switching piece is provided with a brake matching area, and the first matching area, the brake matching area and the second matching area are arranged around the circumference of the state switching piece;

22. The injector drive of claim 21, wherein the state switch has at least one brake release position during rotation of the state switch;

23. The injector drive arrangement of claim 22, wherein a minimum distance from the first engagement region to a rotational centerline of the state switching member is greater than a maximum distance from each of the unbraked engagement region and the brake engagement region to the rotational centerline of the state switching member in a cross-section perpendicular to the rotational centerline of the state switching member; the minimum distance from each of the brake release engagement region and the brake engagement region to the rotation center line of the state switching member is greater than the maximum distance from the second engagement region to the rotation center line of the state switching member;

24. The injector driving device according to claim 22, wherein the state switching member has a brake driving part at an outer circumference thereof, the brake module has a trigger structure provided on a rotation path of the brake driving part;

25. The injector drive arrangement as in claim 24, wherein the trigger structure is a mechanical trigger structure or an electrical signal trigger structure.

26. The injector drive arrangement of claim 24, wherein the brake module has a brake member capable of locking the push-pull module, the trigger structure and the brake member forming a linkage structure in which the trigger structure drives the brake member to switch the brake module to the braking state or the unlocking state.

27. The injector driver of claim 26, wherein in the braking state, the brake is locked by friction, magnetic, snap-fit, and/or engagement structures.

28. The injector driver of claim 26, wherein the brake module has a mounting base, the brake member is movably mounted on the mounting base, the trigger structure includes a contact and a trigger spring, the contact is triggered by the brake driver, and the contact is connected to the brake member through the trigger spring to drive the brake member to switch the brake module to the braking state and/or the unlocking state.

29. The injector driver of claim 28, wherein the brake module has a second reset member that acts on the brake member to actuate the brake member to reset the brake module to the unlocked state.

30. The syringe actuation arrangement of claim 28, wherein the slider assembly further comprises a slider, the mounting base being secured to the slider, the brake extending toward a housing of a medical fluid filling device carrying the syringe for locking with the housing to prevent movement of the push-pull module relative to the housing.

31. The injector drive arrangement of claim 1, wherein the slider assembly further comprises a state switch drive coupled to the state switch to drive rotation of the state switch.

32. The syringe driving apparatus as claimed in claim 31, wherein the state switching member has a gear tooth portion, the state switching driving member includes a motor and a transmission gear, and the motor is engaged with the gear tooth portion through the transmission gear to drive the state switching member to rotate.

33. The injector drive arrangement of claim 31, further comprising a limit detection module and a control unit; the state switching driving piece and the limit detection module are electrically connected with the control unit, and the limit detection module is used for detecting whether the injector and/or the push-pull module reach a loading limit position or not; when the control unit knows that the injector and/or the push-pull module reach the loading limit position, the state switching driving piece is controlled to drive the state switching piece to rotate to the meshing position.

34. The injector drive arrangement of claim 31, further comprising a state switching manual trigger and a control unit; the state switching driving piece and the state switching manual triggering piece are electrically connected with the control unit, the state switching manual triggering piece can input a locking switching signal to the control unit, and the control unit controls the state switching driving piece to drive the state switching piece to rotate to the meshing position according to the locking switching signal.

35. The injector driving device according to claim 1, further comprising a state switching manual trigger member, wherein the state switching manual trigger member and the state switching member are in a linkage structure, and the state switching manual trigger member can drive the state switching member to rotate.

36. The injector driving device is characterized by comprising a push-pull module, a sliding block assembly, a screw rod, a filling driving piece and a connecting rod;

the state switching piece, the screw nut and the braking module form a linkage structure, the screw nut is used for switching the engagement state with the screw rod based on the movement of the state switching piece, and the braking module is used for switching the braking state and the unlocking state based on the movement of the state switching piece.

37. The injector drive arrangement as recited in claim 36, wherein said state switching member is rotatably disposed about said lead screw.

38. The injector drive arrangement of claim 36, wherein during movement of the state switch, the state switch has a disengaged position, a brake position, and an engaged position, the brake position being located between the disengaged position and the engaged position; when the state switching piece is positioned at the disengaging position, the matching surface of the screw nut can be disengaged from the screw rod, and the push-pull module can move relative to the screw rod under the external force of an operator; when the state switching piece is positioned at the braking position, the state switching piece can trigger the braking module to switch to a braking state so that the braking module can lock the push-pull module; when the state switching piece is positioned at the meshing position, the matching surface of the screw nut can be meshed with the screw rod, so that the push-pull module is linked with the screw rod.

39. The injector drive of claim 38, wherein the state switch has at least one brake release position during rotational movement of the state switch;

40. The injector drive arrangement as recited in claim 36, wherein the slider assembly includes a nut and an inner barrel, the inner barrel having a central throughbore, the lead screw passing through the central throughbore, the nut being disposed on the inner barrel and being capable of engaging and disengaging the lead screw.

41. The syringe drive apparatus of claim 40, wherein the state switching member is provided outside the inner cylinder and is rotatable with respect to the inner cylinder.

42. The injector drive of claim 36, wherein the state switch has a braking position and a de-braking position during movement of the state switch;

43. The injector drive arrangement as recited in claim 42, wherein said brake module has a brake member, said brake member being locked with a housing of a medical fluid filling device in said braked condition to inhibit movement of said push-pull module relative to said housing; in the unlocking state, the brake piece is unlocked with the shell.

44. The injector drive arrangement as recited in claim 43, wherein in said braking state, said brake is locked by friction means, magnetic means, snap means and/or engagement means.

45. The injector driving apparatus as recited in claim 43, wherein said brake module has a mounting base, said brake member is movably mounted on said mounting base, said trigger structure includes a contact and a trigger elastic member, said contact is triggered by said brake driving portion, said contact is connected to said brake member through said trigger elastic member to drive said brake member to switch to said braking state and/or said unlocking state.

46. The injector actuation device of claim 45, wherein said brake module has a second reset member, said second reset member acting on said brake member to actuate said brake member to reset to said unlocked state.

47. The injector drive arrangement as recited in claim 45, wherein the slider assembly includes a slider, the connecting rod is secured to the slider, the mounting base is secured to the slider, and the brake is extendable toward a housing of a medical fluid filling device carrying the injector for locking with the housing to prevent movement of the push-pull module relative to the housing.

48. The injector drive arrangement as recited in claim 36, wherein the slider assembly includes a status detection module, the status switch having a detected portion, the status detection module being disposed in a path of movement of the detected portion, the status detection module being triggered by the detected portion to obtain a detection signal.

49. The injector drive arrangement of claim 36, wherein the slider assembly includes a state switch drive connected to the state switch to drive movement of the state switch.

50. The syringe drive arrangement as recited in claim 49, wherein said state switching member has a gear tooth portion, said state switching drive member including a motor and a transmission gear, said motor being engaged with said gear tooth portion through said transmission gear to drive rotation of said state switching member.

51. The injector drive arrangement as recited in claim 50, further comprising a limit detection module and a control unit; the state switching driving piece and the limit detection module are electrically connected with the control unit, and the limit detection module is used for detecting whether the injector and/or the push-pull module reach a loading limit position or not; and when the control unit knows that the injector and/or the push-pull module reach the loading limit position, the state switching piece is controlled to rotate to the engagement position.

52. The injector drive arrangement as recited in claim 49, further comprising a state switching manual trigger and a control unit; the state switching driving piece and the state switching manual triggering piece are electrically connected with the control unit, the state switching manual triggering piece can input a locking switching signal to the control unit, and the control unit controls the state switching piece to rotate to the meshing position according to the locking switching signal.

53. The syringe driving apparatus as recited in claim 49 further comprising a state switching manual trigger member, said state switching manual trigger member being in a linkage configuration with said state switching member, said state switching manual trigger member being capable of driving said state switching member to rotate.

54. A syringe driving apparatus, comprising: the device comprises a push-pull module, a sliding block assembly, a screw rod, a filling driving piece and a connecting rod;

the sliding block assembly comprises a braking module, wherein the braking module is provided with an unlocking state and a braking state, and in the braking state, the sliding block assembly is locked by the braking module so as to prevent the sliding block from moving under the external force of an operator; in the unlocked state, the brake module unlocks the slider assembly to enable the slider assembly and the push-pull module to move together axially along the lead screw.

55. The injector drive arrangement as recited in claim 54, wherein the slider assembly further comprises a state switch movably disposed; the movement of the state switching member is associated with a braking state and an unlocking state of the braking module;

56. The injector drive arrangement as recited in claim 55, wherein the slider assembly includes a nut and an inner barrel, the inner barrel having a central throughbore, the lead screw passing through the central throughbore, the nut being disposed on the inner barrel and being capable of engaging and disengaging the lead screw.

57. The syringe drive arrangement of claim 56 wherein said state switching member is disposed outside of said inner barrel and is rotatable relative to said inner barrel.

58. The injector drive arrangement of claim 55, wherein the state switch has a braking position and a de-braking position during movement of the state switch;

59. The injector drive arrangement as recited in claim 58, wherein said brake module has a brake member that, in said braked condition, locks with a housing of a medical fluid filling device to inhibit movement of said push-pull module relative to said housing; in the unlocking state, the brake piece is unlocked with the shell.

60. The injector drive arrangement of claim 59, wherein in the braking state, the brake is locked by friction means, magnetic means, snap means and/or engagement means.

61. The injector drive arrangement as recited in claim 59, wherein the brake module has a mounting base, the brake member is movably mounted on the mounting base, the trigger structure includes a contact and a trigger spring, the contact is triggered by the brake driving portion, and the contact is connected to the brake member through the trigger spring to drive the brake member to switch to the braking state and/or the unlocking state.

62. The injector drive arrangement as recited in claim 61, wherein the brake module has a second reset member that acts on the brake member to drive the brake member to reset to the unlocked state.

63. The injector drive arrangement as recited in claim 61, wherein the slider assembly includes a slider, the connecting rod is secured to the slider, the mounting base is secured to the slider, and the brake is extendable toward a housing of a medical fluid filling device carrying the injector for locking with the housing to prevent movement of the push-pull module relative to the housing.

64. The injector drive arrangement as recited in claim 55, wherein the slider assembly includes a status detection module, the status switch having a detected portion, the status detection module being disposed in a path of movement of the detected portion, the status detection module being triggered by the detected portion to obtain a detection signal.

65. The syringe actuation arrangement of claim 55, wherein the slider assembly includes a state switch actuator, the state switch actuator being coupled to the state switch actuator to actuate movement of the state switch actuator.

66. The syringe drive apparatus of claim 65, wherein said state switching member has a gear tooth portion, said state switching drive member including a motor and a transmission gear, said motor being engaged with said gear tooth portion through said transmission gear to drive rotation of said state switching member.

67. The injector drive arrangement of claim 66, further comprising a limit detection module and a control unit; the state switching driving piece and the limit detection module are electrically connected with the control unit, and the limit detection module is used for detecting whether the injector and/or the push-pull module reach a loading limit position or not; and when the control unit knows that the injector and/or the push-pull module reach the loading limit position, the state switching piece is controlled to rotate to the engagement position.

68. The injector drive arrangement of claim 66, further comprising a state switching manual trigger and a control unit; the state switching driving piece and the state switching manual triggering piece are electrically connected with the control unit, the state switching manual triggering piece can input a locking switching signal to the control unit, and the control unit controls the state switching piece to rotate to the meshing position according to the locking switching signal.

69. The syringe driving apparatus as recited in claim 65 further comprising a state switching manual trigger member, said state switching manual trigger member being in a linkage configuration with said state switching member, said state switching manual trigger member being capable of driving said state switching member to rotate.

70. A medical fluid filling device, comprising:

a housing;

the injector drive arrangement of any one of claims 1-69 mounted on said housing, said push-pull module to push an injector for injection;

and a control unit for controlling the syringe driving device.

71. A medical fluid filling device, comprising:

a priming drive for providing a priming driving force;