CN211485984U

CN211485984U - Infusion pump

Info

Publication number: CN211485984U
Application number: CN201921987287.6U
Authority: CN
Inventors: 郑宏; 卢艺; 刘华勇; 董申辉; 胡莲
Original assignee: Shenzhen Mindray Scientific Co Ltd
Current assignee: Shenzhen Mindray Scientific Co Ltd
Priority date: 2019-11-15
Filing date: 2019-11-15
Publication date: 2020-09-15
Anticipated expiration: 2029-11-15

Abstract

A lock rod component of the infusion pump is rotatably arranged on an output piece, and a rotation center line of the lock rod component rotating relative to the output piece is positioned in the same horizontal plane with a first axis and is vertical to the first axis. When the locking rod assembly is inclined by a certain angle due to external force, the locking rod assembly can rotate relative to the output piece, so that the axis matching structure of the locking rod assembly and the output piece can be automatically adjusted through the rotating connection mode, the output piece cannot be driven to deflect around the rotating central line, the reaction force of the locking rod assembly to the output piece cannot generate moment deviating from the center of the output piece to the output piece, the output piece can be prevented from deflecting, further, the output piece cannot cause eccentric moment on a part for driving the output piece, and finally a series of problems caused by deflection of the output piece are avoided.

Description

Infusion pump

Technical Field

The application relates to the field of medical equipment, in particular to a locking rod moving structure of an infusion pump.

Background

Infusion pumps are a widely used class of fluid infusion devices. Generally, a pump body of the infusion pump is provided with a door opening and closing lock rod, the door opening and closing lock rod is controlled by driving a screw rod through a motor, the screw rod drives a matched nut, the nut is connected with a lock rod, and the lock rod is translated along with the nut to lock and unlock a lock catch on the pump door, so that the pump door of the infusion pump is opened and closed. Because the locking rod has a large force for opening and closing the door and a large load on the locking rod, the conventional method is to rigidly fix the nut directly on the locking rod. When the motion direction of the lock rod cannot be parallel to the screw rod, the nut and the screw rod are matched to generate torque, so that the motor can drive the lock rod to move only by outputting larger torque. The locking rod is difficult to guarantee to be parallel to the screw rod in the actual motion process, and the rigid connection mode can generate moment on the nut screw rod. If the torque allowance of the motor is not enough, the conditions of jamming and unsmooth door opening and closing can occur; if the motor torque allowance is too large, the system power consumption can be increased, and the motor size is increased, so that the equipment is inconvenient to miniaturize.

Disclosure of Invention

The present application provides an infusion pump.

In one embodiment of the present application, an infusion pump is provided, comprising:

the infusion pump comprises a pump main body, a mounting seat, a locking rod assembly and a driving mechanism, wherein the pump main body is used for mounting an infusion tube, and the inside of the pump main body also comprises the mounting seat, the locking rod assembly and the driving mechanism for driving the locking rod assembly to move;

the pump door is movably arranged on the pump main body and used for shielding and exposing the infusion tube, and a lock catch is arranged on the pump door;

the locking rod assembly is movably mounted on the mounting seat and is provided with a buckling part matched with the lock catch; the driving mechanism is provided with a driving piece and an output piece in transmission connection with the driving piece, the locking rod assembly is rotatably arranged on the output piece, and the output piece drives the locking rod assembly to do reciprocating linear motion along a first axis in a horizontal plane, so that the buckling part of the locking rod assembly is locked with the lock catch or unlocked with the lock catch; the first axis passes through the center of the output part, and the rotation center line of the locking rod assembly relative to the output part is positioned in the same horizontal plane with the first axis and is vertical to the first axis.

According to the infusion pump of the embodiment, the lock rod component is rotatably arranged on the output member, and the rotation center line of the lock rod component rotating relative to the output member is positioned in the same horizontal plane and is perpendicular to the first axis. When the locking rod assembly is inclined by a certain angle due to external force, the locking rod assembly can rotate relative to the output piece, so that the axis matching structure of the locking rod assembly and the output piece can be automatically adjusted through the rotating connection mode, the output piece cannot be driven to deflect around the rotating central line, the reaction force of the locking rod assembly to the output piece cannot generate moment deviating from the center of the output piece to the output piece, the output piece can be prevented from deflecting, further, the output piece cannot cause eccentric moment on a part for driving the output piece, and finally a series of problems caused by deflection of the output piece are avoided.

Drawings

FIGS. 1 and 2 are schematic views of an infusion pump (with the pump door open) according to an embodiment of the present application;

FIGS. 3 and 4 are schematic views of the internal structure layout of the pump body according to an embodiment of the present application;

FIG. 5 is a schematic view of a first metal mounting seat and a second metal mounting seat (unlocked state) in an embodiment of the present disclosure;

FIG. 6 is a schematic view of a first metal mounting seat and a second metal mounting seat (locked state) in an embodiment of the present application;

FIG. 7 is a schematic view of the pump body assembly installed according to an embodiment of the present application;

FIG. 8 is a schematic view of the locking bar assembly and locking catch assembly in a locked condition in accordance with an embodiment of the present application;

FIG. 9 is a schematic view of a pump body assembly mounting structure according to an embodiment of the present disclosure;

FIG. 10 is a schematic view of a pump body assembly according to an embodiment of the present application;

FIG. 11 is a schematic view of the mating arrangement of the locking rod assembly and locking rod actuation mechanism of one embodiment of the present application;

FIG. 12 is a schematic view of the locking rod assembly assembled with the lead screw nut actuator according to one embodiment of the present application;

FIG. 13 is a partial cross-sectional view of a lead screw in the lead screw nut drive mechanism according to one embodiment of the present application;

FIG. 14 is a schematic view of an embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following detailed description and accompanying drawings. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The present embodiments provide an infusion pump. The infusion pump is used for controlling parameters such as infusion drop number or infusion flow rate and the like, and ensures that drugs can be installed at a set speed, and the drugs can accurately and safely enter the body of a patient.

Referring to fig. 1 to 4, the infusion pump includes a pump body 100 and a pump door 200. The pump door 200 is installed on the pump body 100 in a lockable and openable manner. In this lockable and openable manner, generally, the pump door 200 is rotatably mounted on the pump main body 100 such that the pump door 200 can be rotated to open and close the pump door 200. When the administration of the liquid is required, the pump door 200 is moved to the corresponding locking position and locked with the pump main body 100 so as to administer the liquid. Of course, in some embodiments, the lockable and openable manner is not limited to the pump door 200 being rotatably connected to the pump body 100, and the pump door 200 may be locked and unlocked with the pump body 100 by sliding, flipping, folding, or the like. In addition, in other embodiments, the lockable and openable manner may be that the pump door 200 is detachably connected to the pump main body 100, that is, in the open state, the pump door 200 is completely detachable from the pump main body 100, and when the lock is required, the pump door 200 is mounted on the pump main body 100.

With continued reference to fig. 1-6, the pump body 100 includes a pump body housing 110, a control module (not shown), an external interface assembly 120, a power module 130, a battery assembly 140, a lock lever assembly 150 (see fig. 11), a lock lever driving mechanism 160, and a pump body assembly 170.

The pump body case 110 has a mounting cavity for mounting the components. The side of the pump body case 110 facing the pump door 200 is provided with a front cover 111, and the front cover 111 has a transfusion tube mounting structure for mounting a transfusion tube and a pump body mounting position for mounting the pump body assembly 170. The infusion tube mounting structure is used to stabilize an infusion tube on the pump main body 100 for infusion and various tests. As shown in fig. 1, the infusion tube 300 is placed on an infusion tube mounting structure of the front cover 111, which may be a clamp structure or other mounting structure in general, but not explicitly described herein. The pump body mounting location is typically a mounting window 1111 (shown in fig. 7), and the portion of the pump body 100 that is used to compress the infusion tube 300 can extend from the mounting window 1111 to compress the infusion tube 300.

The control module is the entire control center of the infusion pump, which typically has a processor and associated control circuitry, etc. The control module is connected to other modules, components or mechanisms that need to be controlled in order to control the modules, components or mechanisms according to system settings. The external interface module 120 is mainly used for signal communication with external devices and power supply to the infusion pump. The external interface component 120 can select different interfaces as required, for example, in some embodiments, referring to fig. 2, the external interface component 120 can include a power interface 121, a USB interface 122, a multifunction interface 123, and the like. In addition, to further save space and make the infusion pump more compact, in one embodiment, the external interface module 120 is further provided with a speaker 124 for playing the audio signal without the need to provide a speaker elsewhere in the infusion pump.

The power module 130 is connected to the control module and is used to supply power to the system and other electrical components. The battery assembly 140 functions as a power storage device and is typically powered when the infusion pump is powered off, although the battery assembly 140 may be used to provide power in the non-powered state. The locking bar assembly 150 is operable to lock with the pump door 200, and the locking bar drive mechanism 160 is operable to drive movement of the locking bar assembly 150 to switch the locking bar assembly 150 between the locked and unlocked positions. The pump assembly 170 is used to apply a squeezing force to the infusion tube 300, thereby driving the fluid in the infusion tube 300 to flow forward. The pump body assembly 170 may be of any type of construction capable of squeezing an infusion pump, such as a peristaltic pump. The control module, external interface assembly 120, power module 130, battery assembly 140, locking bar assembly 150, locking bar drive mechanism 160, and pump body assembly 170 are all mounted within the mounting cavity.

Further, the locking rod assembly 150 is removably mounted to a mounting block including, but not limited to, the pump body housing 110 and the first metal mounting block 112 described below. During movement of the locking lever assembly 150, it locks and unlocks with a latch mechanism on the pump door 200, thereby locking and unlocking the pump door 200 and the pump body 100.

A typical locking rod driving mechanism 160 employs a motor, the motor drives a lead screw, the lead screw drives a matched nut, the nut is connected with a locking rod of the locking rod assembly 150, and the locking rod translates along with the nut to lock and unlock a lock catch on the pump door 200, thereby opening and closing the pump door 200 of the infusion pump. Because the locking rod has a large force for opening and closing the door and a large load on the locking rod, the conventional method is to rigidly fix the nut directly on the locking rod. When the motion direction of the lock rod cannot be parallel to the screw rod, the nut and the screw rod are matched to generate torque, so that the motor can drive the lock rod to move only by outputting larger torque. The locking rod is difficult to guarantee to be parallel to the screw rod in the actual motion process, and the rigid connection mode can generate moment on the nut screw rod. If the torque allowance of the motor is not enough, the conditions of jamming and unsmooth door opening and closing can occur; if the motor torque allowance is too large, the system power consumption can be increased, and the motor size is increased, so that the equipment is inconvenient to miniaturize.

In this regard, in one embodiment, the locking rod drive mechanism 160 has a drive member and an output member drivingly connected to the drive member. The locking rod assembly 150 is rotatably mounted on the output member, and the output member drives the locking rod assembly 150 to perform reciprocating linear motion along a first axis in a horizontal plane, so that the locking rod assembly 150 is locked with the latch or unlocked from the latch. The first axis passes through the axis of the output member, such as shown in fig. 11 and 12, and in one embodiment, the output member is a nut 163 of a screw nut transmission mechanism, and the first axis passes through the axis of the nut 163, i.e., coincides with the central axis of a screw 162 to which the nut 163 is mated. Of course, the output member may also be another component, such as a piston rod in a cylinder, a hydraulic cylinder, in which case the first axis coincides with the centre axis of the piston rod. The rotation center line of the lock rod assembly 150 relative to the output member is located in the same horizontal plane as the first axis and is perpendicular to the first axis.

The lock rod assembly 150 is rotatably mounted on the output member, and a rotation center line of the lock rod assembly 150 rotating relative to the output member is positioned in the same horizontal plane and perpendicular to the first axis. When the lock rod assembly 150 is inclined by a certain angle due to an external force, the lock rod assembly 150 can rotate relative to the output member, so that the axis matching structure of the lock rod assembly and the output member is automatically adjusted through the rotation connection mode, the output member cannot be driven to deflect around the rotation center line, the reaction force of the lock rod assembly 150 to the output member cannot generate moment deviating from the center of the output member to the output member, the output member can be prevented from deflecting, further, the output member cannot cause eccentric moment on a component (such as a screw rod 162 in the following text or a piston cylinder in other embodiments) for driving the output member, and finally, a series of problems caused by deflection of the output member are avoided.

Further, the output member and the lock rod assembly 150 are in line contact and/or point contact, contact positions of the line contact and/or the point contact are symmetrically distributed on two sides of the first axis and are located in the same horizontal plane with the first axis, and a connecting line of the contact positions of the output member and the lock rod assembly 150 is perpendicular to the first axis.

The driving mechanism can be selected from but not limited to an electric motor transmission structure, for example, as shown in the foregoing, it can also adopt an air cylinder, a hydraulic cylinder, and even other structures capable of outputting reciprocating linear motion, such as an electromagnet.

Referring to fig. 11 to 12, in an embodiment, the driving mechanism includes a screw nut transmission mechanism, the driving member is a motor 161, a nut 163 of the screw nut transmission mechanism is used as an output member, the lock rod assembly 150 is mounted on the nut 163, the motor 161 drives the screw 162 of the screw nut transmission mechanism, so as to drive the nut 163 and the lock rod assembly 150 to move, and the first axis coincides with a central axis of the screw 162 of the screw nut transmission mechanism.

Further, as an example of a rotatable connection, in an embodiment, at least one of the nut 163 and the locking rod assembly 150 has a protrusion 1631, and the other has a bayonet 1521 corresponding to the protrusion 1631, the bayonet 1521 is rotatably sleeved on the outer wall of the protrusion 1631, and the inner wall of the bayonet 1521 is in line contact with the outer wall of the protrusion 1631. In the structure shown in fig. 11 and 12, two sides of the nut 163 are respectively provided with a protrusion 1631, and the locking rod assembly 150 is provided with a bayonet 1521 corresponding to the protrusion 1631.

To ensure line contact, in one embodiment, at least one of the inner wall of the bayonet 1521 and the outer wall of the boss 1631 has an arcuate wall. Referring to fig. 11 to 12, the protrusion 1631 is in a cylindrical shape, and the outer wall of the arc shape is in line contact with the inner wall of the bayonet 1521. Of course, in some other embodiments, the protrusion 1631 may only have a portion contacting with the inner wall of the bayonet 1521 as an arc-shaped wall, and other non-contacting portions may have other shapes. In addition, the inner wall of the bayonet 1521 may be configured to have an arc-shaped wall, and the protrusion 1631 may be configured to have an arc-shaped wall, or may be configured to have another shape, such as a plane, so as to achieve line contact between the two. In some embodiments, the bayonet 1521 may be a circular hole and the protrusion 1631 may be a circular shaft, both of which have an arcuate wall. At this time, the bayonet 1521 is slightly larger than the protrusion 1631, so that the protrusion 1631 can move in the bayonet 1521, so that the locking rod assembly 150 can be automatically adjusted in position on the nut 163 after being stressed.

In addition to the above-mentioned line contact, the output member and the lock lever assembly 150 may also adopt a point contact manner, for example, the contact portions on the output member and the lock lever assembly 150 are all arranged in a sphere shape, so as to form a ball-to-ball butt joint manner, thereby forming a point contact. The point contact positions are symmetrically distributed on two sides of the first axis, and connecting lines of all the contact points and the first axis are positioned on the same horizontal plane and are vertical to the first axis.

Referring to fig. 11 to 12, in an embodiment, the bayonet 1521 has a U-shaped opening, and the U-shaped bayonet 1521 is inserted into the protrusion 1631.

Referring to fig. 13, in one embodiment, the lead screw 162 has rectangular gear teeth 1621. The transmission efficiency of the rectangular gear teeth 1621 is higher than that of the triangular teeth and the trapezoidal teeth, and the transmission efficiency between the screw rod 162 and the nut 163 can be improved.

Referring to fig. 11, in one embodiment, a motor 161 is drivingly connected to a lead screw 162 of a lead screw nut transmission mechanism through a gear transmission mechanism 164. In other embodiments, it may also adopt a belt wheel mechanism, a chain wheel mechanism and the like to transmit the movement.

Further, the locking rod assembly 150 is engaged with the locking assembly 220, so that the locking assembly 220 has a locking device with a hook portion therein, and the corresponding locking rod assembly 150 has an engaging portion for engaging with the locking device. Referring to fig. 11 and 12, in one embodiment, the locking rod assembly 150 includes a locking rod 151 and a connector 152, and the locking portion is disposed on the locking rod 151. The lock rod 151 is connected to a connector 152, and the connector 152 is rotatably connected to an output member (e.g., a nut 163) such that the output member moves the connector 152 and the lock rod 151. The structure of the lock lever assembly 150 connected to the output member may be embodied on the connecting member 152. The locking bar 151 and the connecting member 152 may be fixedly coupled or integrally formed. The connection member 152 and the locking rod 151 may be fixedly connected by various means, such as, but not limited to, screw fastening, clamping, welding, bonding, etc.

Referring to fig. 14, in an embodiment, the fastening portion has a buckle 1511, and the buckle 1511 is a hook-shaped structure. The buckle 1511 has a buckling surface 1512 for contacting the corresponding buckle element 220 and buckling the buckle element 220. Referring to fig. 6 and 8, when the pump door 200 and the pump body 100 need to be locked, the latch assembly 220 moves to the entrance of the latch 1511, and then the locking rod 151 is driven by the locking rod driving mechanism 160 to move to the locking position, and as shown in fig. 8, the locking rod 151 moves from right to left to move to the locking position. The fastening surface 1512 is a slant surface, so that the driving latch assembly 220 gradually approaches the side of the lock rod 151 and finally snaps into the groove of the buckle 1511. When unlocking is required, the locking rod driving mechanism 160 drives the locking rod 151 to move to the unlocking position, as shown in fig. 8, the locking rod 151 moves from left to right, and further releases the locking assembly 220, and at this time, the pump door 200 can be opened.

Since the resistance to the movement of the pump door 200 to the pump body is mainly caused by the reaction force of the squeezed infusion tube 300 on the latch assembly 220 during the locking process, the latch assembly 220 needs to overcome the reaction force and move a certain distance to the side of the lock rod 151. If the slope of the fastening surface 1512 is too small, the fastening surface 1512 must be set to be very long to pull the latch assembly 220 into place, which results in an overall pump that is too bulky and not compact. On the other hand, if the slope of the fastening surface 1512 is too large, the latch 1511 will receive a larger force (the relative slope is too small) from the latch assembly 220 when the latch 1511 pulls the latch assembly 220 toward the lock rod 151. To overcome this force, the lock lever driving mechanism 160 needs to output a larger driving force, increasing the load of the driving member (e.g., the motor 161), which causes an increase in the cost of the lock lever driving mechanism 160.

To address this problem, referring to fig. 14, in an embodiment of the present application, the fastening surface 1512 has a first inclined surface 1513 and a second inclined surface 1514, the first inclined surface 1513 is disposed at an outer end of the fastening surface 1512, the second inclined surface 1514 is connected to an inward end of the first inclined surface 1513, and an inclination angle a1 of the first inclined surface 1513 is greater than an inclination angle a2 of the second inclined surface 1514.

When the pump door 200 needs to be locked with the pump body, the pump door 200 is moved to the opening of the buckle 1511, and then the lock rod 151 is driven to move towards the locking position. The first inclined surface 1513 of the latch 1511 first contacts the latch assembly 220, and at this stage, the pump door 200 only slightly presses the infusion tube 300, and the reaction force from the infusion tube 300 is not large, so that the tilt angle a1 of the first inclined surface 1513 can be set large to quickly pull the latch assembly 220 a distance without overloading the driving member. When the latch assembly 220 slides along the first inclined surface 1513 to the second inclined surface 1514, the infusion tube 300 is squeezed to a certain extent, so that the reaction force to the pump door 200 and the latch assembly 220 is increased, and at this time, because the inclination of the second inclined surface 1514 is smaller than that of the first inclined surface 1513, an excessive load is still not caused to the driving member in the process of pulling the latch assembly 220. Finally, the latch slides into the groove of the catch 1511 after passing through the second inclined surface 1514, completing the locking.

The first ramp 1513 is inclined more than necessary to quickly pull the latch assembly 220 and the pump door 200 into position, and then to slowly pull the latch assembly 220 through the second ramp 1514. In this combination, the stroke of the latch assembly 220 on the fastening surface 1512 can be reduced, so that the latch rod 151 does not need to be too long, which is beneficial to the compactness of the device, and the load of the driving member (such as the motor 161) can be reduced, thereby avoiding the damage of the driving member, and reducing the cost of the latch rod driving mechanism 160.

Referring to fig. 11 and 12, in an embodiment, the lock rod 151 is a strip-shaped sheet structure, and at least two buckling portions are disposed on a side of the lock rod 151 facing the corresponding lock catch. Referring to fig. 5, three snaps 1511 are shown, which are disposed on the locking lever 151 at the same interval. Three corresponding lock catches are also arranged, and the positions of the three corresponding lock catches correspond to those of the buckles 1511.

Further, in order to improve the compactness of the entire apparatus, the apparatus volume is reduced. In one embodiment, referring to fig. 1 to 6, the battery assembly 140, the pump body assembly 170 and the lock rod driving mechanism 160 are disposed side by side behind the front cover 111. The pump body assembly 170 is disposed at the pump body mounting position to squeeze the infusion tube 300. The battery assembly 140 and the lock lever driving mechanism 160 are respectively disposed at both sides of the pump body assembly 170. Locking bar assembly 150 is positioned above pump body assembly 170 and locking bar drive mechanism 160 (shown in connection with fig. 5 and 6), and locking bar drive mechanism 160 drives locking bar assembly 150 to move to lock and unlock locking bar assembly 150 with pump door 200. The power module 130 is disposed alongside the external interface assembly 120, one of which is located behind the pump body assembly 170 and the other of which is located behind the locking bar driving mechanism 160. In fig. 3 and 4, the external interface assembly 120 is located behind the locking lever drive mechanism 160 and the power module 130 is located behind the pump body assembly 170. In other embodiments, the two positions may be interchanged.

Correspondingly, referring to fig. 1 and 2, the pump door 200 has a door body 210, a latch assembly 220, and a crimp tube assembly 230. The latch assembly 220 and the pressure tube assembly 230 are mounted to the door body 210. The door 210 may be rotatably coupled to the pump body housing 110 or otherwise coupled thereto. The locking assembly 220 is used for locking with the locking rod assembly 150, and the pressure tube assembly 230 is arranged corresponding to the position of the pump body assembly 170 and is used for extruding the infusion tube 300 together with the pump body assembly 170. The crimp assembly 230 may be a crimp block or other structural crimp device for the infusion tube.

In the above embodiment, the overall layout is arranged according to the volume and shape of each component, and advantages and disadvantages in the volume and shape of each component can be fully utilized, so that the overall structure is more compact, and the overall volume is smaller.

Further, referring to fig. 1 and 4, in an embodiment, the pump body 100 further includes a liquid stopping assembly 181. For convenience of description, in the present application, the front cover 111 is divided into an upstream area and a downstream area by the pump assembly 170 according to the fluid flow direction of the infusion tube 300, that is, the portion of the infusion tube 300 where the fluid flows toward the pump assembly 170 is an upstream area 301, the portion of the infusion tube flowing away from the pump assembly 170 is a downstream area 302, the area of the front cover 111 corresponding to the upstream area 301 of the infusion tube 300 is an upstream area, and the area corresponding to the downstream area 302 of the infusion tube 300 is a downstream area. In the angle shown in fig. 1, the fluid in the infusion tube 300 flows from right to left, and the portion of the front cover 111 located on the right side of the pump block assembly 170 is the upstream area, and the portion located on the left side of the pump block assembly 170 is the downstream area. The liquid stopping component 181 is located at the downstream region of the front cover 111 and is exposed from the front cover 111 so as to stop the liquid flow in the infusion tube 300. In terms of the direction of fluid flow in the infusion tube 300, the fluid stop assembly 181 is disposed downstream of the pump assembly 170 to facilitate the interruption of the flow of more fluid. When the transfusion is not needed, the liquid in the tube can be stopped rapidly, and excessive liquid is not allowed to flow into a patient. In particular, the liquid stopping assembly 181 is disposed outside the downstream region as much as possible, so that the flow of liquid to the patient is reduced as much as possible when infusion is not required, and the safety of the product is ensured.

Referring to fig. 4, in one embodiment, the liquid stop element 181 is disposed in the gap between the lock rod driving mechanism 160 and the front cover 111. The liquid stopping unit 181 is located right in front or just in front of the lock lever driving mechanism 160 (the side where the front cover 111 is located is front, and the side opposite to the front cover 111 is rear, the same applies below), and can fully utilize the space between the lock lever driving mechanism 160 and the front cover 111.

In the above embodiments, the liquid stopping assembly 181 may adopt a liquid stopping clip or other liquid stopping structure. In addition, in some embodiments, the infusion pump may not be provided with the liquid stopping component 181, and a liquid stopping structure is manually added to the portion of the infusion tube 300 located outside the infusion pump to stop the liquid flow in the infusion tube 300.

Further, in order to improve the safety of the infusion pump and monitor the status of the infusion, referring to fig. 1 to 4, in one embodiment, the pump body 100 further includes an upper pressure detecting element 182 and a lower pressure detecting element 183. The upper pressure sensing assembly 182 is located at an upstream region of the front cover 111. The lower pressure detecting unit 183 is located at a downstream region of the front cover 111 and upstream of the liquid stopping unit 181. The upper pressure detecting unit 182 and the lower pressure detecting unit 183 are exposed from the front cover 111 to detect the pressure of the liquid in the infusion tube 300. The door body 210 is provided with an upper pressure detecting pressure block 241 corresponding to the upper pressure detecting assembly 182 and a lower pressure detecting pressure block 242 corresponding to the lower pressure detecting assembly 183.

The upper pressure detecting unit 182 and the lower pressure detecting unit 183 may use a pressure sensor or the like to detect the pressure in the infusion tube 300. The upper pressure detecting unit 182 mainly detects pressure data of the infusion tube 300 before being pressurized by the pump unit 170, and the lower pressure detecting unit 183 mainly detects pressure data of the infusion tube 300 after being pressurized by the pump unit 170. The data are combined and analyzed, so that accurate pressure data can be obtained, the infusion parameters of the infusion pump can be better adjusted, and the safety of patients in use is improved.

Referring to fig. 3 and 4, in one embodiment, the upper pressure detecting assembly 182 is mounted in the gap between the battery assembly 140 and the front cover 111. In one embodiment, the downward pressure sensing assembly 183 is mounted in the gap between the locking bar drive mechanism 160 and the front cover 111. Further improving the compactness of the whole machine.

Further, to improve the safety of the infusion pump and monitor the status of the infusion, referring to fig. 1-4, in one embodiment, the pump body 100 further comprises an upper ultrasonic detection assembly 184 and a lower ultrasonic detection assembly 185. An upper ultrasonic detection assembly 184 is located in an upstream region of the front cover 111 and downstream of the upper pressure detection assembly 182. The lower ultrasonic detection unit 185 is located at a downstream region of the front cover 111 and upstream of the lower pressure detection unit 183. The upper and lower

ultrasound detection assemblies

184, 185 are exposed from the front cover 111 to detect air bubbles within the infusion tube 300. The door body 210 is provided with an upper ultrasonic detection pressing block 251 corresponding to the upper ultrasonic detection assembly 184 and a lower ultrasonic detection pressing block 252 corresponding to the lower ultrasonic detection assembly 185.

The pressure and ultrasonic dual detection mode can detect the pressure in the tube and the bubbles in the tube, so that the detection accuracy of the bubbles and the pressure can be improved, and the product is safer.

In the above embodiment, the upper ultrasonic detection assembly 184 and the lower ultrasonic detection assembly 185 are located outside the upper pressure detection assembly 182 and the lower pressure detection assembly 183, respectively, and in fact, the positions of the ultrasonic detection assemblies and the pressure detection assemblies can be interchanged. For example, in one embodiment, the upper ultrasonic detection assembly 184 is located at an upstream region of the front cover 111 and upstream of the upper pressure detection assembly 182. The lower ultrasonic detection unit 185 is located at a downstream region of the front cover 111 and between the lower pressure detection unit 183 and the liquid stop unit 181.

Referring to fig. 3 and 4, in one embodiment, the upper ultrasonic detection assembly 184 is mounted in the gap between the battery assembly 140 and the front cover 111. In one embodiment, the lower ultrasonic detection assembly 185 is mounted in the gap between the latch lever drive mechanism 160 and the front cover 111.

Further, referring to fig. 1 to 4, in an embodiment, the pump main body 100 further includes an upper tube in-position detecting assembly 186 and a lower tube in-position detecting assembly 187. The upper tube in-position detection assembly 186 is located in an upstream region of the front cover 111 and upstream of the upper pressure detection assembly 182 and the upper ultrasonic detection assembly 184. The lower tube position detection assembly 187 is located in a downstream region of the front cover 111 and downstream of the liquid stop assembly 181. An upper tube position detection assembly 186 and a lower tube position detection assembly 187 are exposed from the front cover 111 to detect whether the infusion tube 300 is in place.

Referring to fig. 3 and 4, in one embodiment, the upper tube position detecting assembly 186 is mounted in the gap between the battery assembly 140 and the front cover 111. In one embodiment, the down tube position detection assembly 187 is mounted to the rear side of the front cover 111 and outside the lock bar drive mechanism 160.

The upper tube position detection assembly 186 and the lower tube position detection assembly 187 can detect and indicate whether the infusion tube 300 is properly positioned. And the position where the infusion tube 300 is least easy to be installed in place is the two outermost sides of the machine, therefore, as shown in fig. 1, in one embodiment, the upper tube in-place detection assembly 186 and the lower tube in-place detection assembly 187 are respectively arranged at the outermost ends of the two sides of the front cover 111, so that the tube in-place monitoring is effectively realized, and the product safety is improved.

Further, referring to fig. 1 to 4, in one embodiment, the pump body 100 further includes a drop number sensor 188 disposed behind the upper tube position detecting assembly 186. The liquid drop counting device can be used for detecting the dropping state of liquid and counting liquid drops.

Further, referring to fig. 3 and 4, in an embodiment, the pump main body 100 further includes a wireless signal module 189, such as a WIFI module, a bluetooth module, etc., which is disposed outside the lock bar driving mechanism 160 and in front of the external interface component 120 (which may be replaced by the power module 130), so as to fully occupy this space.

On the other hand, the pump body housing 110 is generally located outside the pump body 100, and the control module, the external interface assembly 120, the power module 130, the battery assembly 140, the latch lever assembly 150, the latch lever driving mechanism 160, and the pump body assembly 170 are directly or indirectly mounted on the pump body housing 110. The pump door 200 is also typically mounted to the pump body housing 110 for relative movement.

The flow of the liquid in the infusion pump is pushed by the pressing force applied to the infusion tube 300 by the pump body assembly 170 (such as a peristaltic pump) and the tube pressing block used with the pump body assembly 170, and the pump body assembly 170 and the tube pressing block respectively press the infusion tube 300 from two sides of the infusion tube 300, that is, the infusion tube 300 generates corresponding reaction force to the pump body assembly 170 and the tube pressing block respectively. Generally, the pump body case 110 is made of plastic, the pump body assembly 170 is mounted on the plastic pump body case 110 through a screw, when the pump body assembly 170 is subjected to a reaction force of the infusion tube 300 for a long time during operation, the force is equivalent to an alternating load, and when the screw for fixing the pump body assembly 170 on the plastic pump body case 110 is subjected to an impact of the alternating load for a long time, the pump body case 110 is easily cracked. And then the pump body shell 110 will be displaced, when the pump door 200 and the pump body are locked, the distance between the pump body shell 110 and the pressure pipe block becomes large, especially when the distance between the pump body shell 110 and the pressure pipe block is increased to be unable to block the infusion tube 300, the liquid in the infusion tube 300 will generate free flow, and cause an extreme injury to the patient.

Therefore, referring to fig. 5 to 8, in one embodiment, the pump body 100 further includes a first metal mounting seat 112. The first metal mount 112 is mounted within the pump body housing 110. At least pump body assembly 170, lock rod assembly 150, and lock rod drive mechanism 160 are mounted on first metal mount 112. The pump door 200 includes a second metal mounting seat 211, the second metal mounting seat 211 is disposed in the door body 210, and at least the pressure pipe assembly 230 and the locking assembly 220 are mounted on the second metal mounting seat 211. In this embodiment, the pump body case 110 and the door body 210 are not limited to metal materials, but may be made of plastic.

In another embodiment, at least a portion of the pump body housing 110 is a first metal mounting seat made of a metal material. That is, the pump body housing 110 may be partially or entirely made of a metal material, thereby forming a first metal mount. For example, the first metal mount may be formed as one or more of a front cover 111, a bottom cover, a top cover, and a rear cover of the pump body 100. At least pump body assembly 170, lock rod assembly 150, and lock rod drive mechanism 160 are mounted on a first metal mount. Other components may also be mounted to the first metal mount, or to other portions of the pump body housing 110 (e.g., where non-metallic portions are present). Similarly, at least a portion of the door body 210 of the pump door 200 is a second metal mounting seat made of a metal material, that is, the door body 210 may be partially or entirely made of a metal material, so as to form the second metal mounting seat. Crimp tube assembly 230 and latch assembly 220 are mounted on a second metal mount.

Further, one end of the first metal mounting seat 112 is rotatably connected to the second metal mounting seat 211, so that the door 210 rotates relative to the pump body 100. A locking position and an unlocking position are arranged on the motion track of the second metal mounting seat 211; in the locking position, the locking rod assembly 150 is locked with the locking button assembly 220, the pressure tube assembly 230 and the pump body assembly 170 are positioned at two sides of the infusion tube 300, and the infusion tube 300 is squeezed when the pump body assembly 170 is started so as to carry out infusion; in the unlocked position, locking lever assembly 150 and latch assembly 220 are unlocked such that pressure tube assembly 230 can be moved away from one side of infusion tube 300 to release the infusion.

Because the strength and rigidity of the metal parts are good, the metal parts are not easy to deform and crack and break after being stressed, and the pump body assembly 170 and the pressure pipe assembly 230 can be ensured to be still reliably fixed with the corresponding first metal mounting seat 112 and the second metal mounting seat 211 when being subjected to the reaction force of the infusion tube 300. Meanwhile, the pump body assembly 170 and the pressure pipe assembly 230 receive reaction force of the infusion tube 300, the reaction force is respectively transmitted to the first metal mounting seat 112 and the second metal mounting seat 211, the first metal mounting seat 112 and the second metal mounting seat 211 are connected with each other at the moment, and the characteristics of high strength and rigidity of metal materials are matched, so that closed loop transmission of force can be formed, partial reaction force is mutually offset, stress damage of each metal support and part is reduced, the reliability of fixing the pump body assembly 170 is ensured, and the safety of products is ensured.

Further, referring to FIG. 5, in one embodiment, the locking rod assembly 150 is movably mounted to a mounting base, such as the pump body housing 110 or the first metal mounting base 112. The pump body housing 110 or the first metal mounting base 112 has a protruding guiding limiting portion 1125, the lock rod assembly 150 has a corresponding guiding opening 1512, the guiding opening 1512 is sleeved on the guiding limiting portion 1125, and a wear-resistant member 1126 is installed in a region of the guiding opening 1512, which is in contact with the guiding limiting portion 1125.

Further, the first metal mounting seat 112 and the second metal mounting seat 211 may be integrally formed, or may be formed by fixedly connecting a plurality of metal components. The first metal mounting base 112 and the second metal mounting base 211 can be made of sheet metal parts, die-cast parts, machined parts, profile parts, and the like.

Referring to fig. 5 to 8, in an embodiment, first metal mounting seat 112 includes an upper metal piece 1121 and a lower metal piece 1122, pump body assembly 170 is fixedly mounted on lower metal piece 1122 or upper metal piece 1121, lock rod assembly 150 is movably mounted on upper metal piece 1121, upper metal piece 1121 is fixedly mounted on lower metal piece 1122, and second metal mounting seat 211 is hinged to lower metal piece 1122. Locking rod assembly 150 may be movably mounted on upper metal 1121.

Of course, in other embodiments, the first metal mounting base 112 can also be formed by joining left and right metal pieces.

Referring to fig. 5 to 8, as an example of up-down split, the lower metal member 1122 is substantially U-shaped, the upper metal member 1121 is substantially inverted U-shaped, and the upper metal member 1121 and the lower metal member 1122 are butted and fixedly connected by a metal member (e.g., a screw 1124).

Referring to fig. 5 to 8, in an embodiment, the front cover metal member 1123 is further included, and the front cover metal member 1123 is fixedly connected to the first metal member and the second metal member for installing related components on the front cover 111. The front cover metal 1123 may be used as the front cover 111 of the pump body 100, or may be made of a different material from the front cover 111 and then assembled together, for example, the front cover 111 may be made of plastic.

Referring to fig. 9 and 10, in one embodiment, a peristaltic pump is illustrated. The pump body assembly 170 includes a pump mount 171, a peristaltic pump 172, and a resilient member 173, the pump mount 171 being fixedly mounted to the first metal mount 112, e.g., to the lower metal member 1122. The peristaltic pump 172 is mounted on a pump mount 171, such as may be mounted on a sliding shaft 176 of the pump mount 171. The elastic member 173 acts between the peristaltic pump 172 and the first metal mounting base 112, and provides an elastic restoring force to the peristaltic pump 172 to drive the peristaltic pump 172 toward the pressure tube assembly 220.

In fig. 9 and 10, the pump mount 171 is fixedly mounted on the lower metal member 1122 by a metal member (e.g., screw 175), but it may be mounted on the upper metal member 1121 or elsewhere on the first metal mount 112.

The present invention has been described in terms of specific examples, which are provided to aid understanding of the invention and are not intended to be limiting. For a person skilled in the art to which the invention pertains, several simple deductions, modifications or substitutions may be made according to the idea of the invention.

Claims

1. An infusion pump, comprising:

2. The infusion pump of claim 1, wherein the output member and the latch lever assembly are in line contact and/or point contact, the line contact and/or point contact are located in the same horizontal plane and symmetrically distributed on two sides of the first axis, and a line connecting the output member and the latch lever assembly is perpendicular to the first axis.

3. The infusion pump of claim 2, wherein said drive mechanism comprises a feed screw-nut mechanism, said drive member is a motor, a nut in said feed screw-nut mechanism serves as said output member, said locking rod assembly is mounted on said nut, and said motor drives a feed screw in said feed screw-nut mechanism to move said nut and locking rod assembly.

4. The infusion pump of claim 3, wherein said first axis is coincident with a central axis of a lead screw in said lead screw-nut mechanism.

5. The infusion pump of claim 4, wherein at least one of said nut and locking bar assembly has a projection and the other has a bayonet corresponding to said projection, said bayonet being rotatably fitted over an outer wall of said projection, an inner wall of said bayonet being in line contact with said outer wall of said projection.

6. The infusion pump of claim 5, wherein at least one of the inner wall of the bayonet and the outer wall of the boss has an arcuate wall.

7. The infusion pump of claim 5, wherein said bayonet has a U-shaped opening, said U-shaped bayonet being snapped onto said projection.

8. The infusion pump of claim 5, wherein said projections are provided on both sides of said nut, respectively, and said locking bar assembly is provided with said notches corresponding to said projections.

9. The infusion pump of claim 4, wherein said lead screw has rectangular gear teeth.

10. The infusion pump of claim 3, wherein said motor is drivingly connected to a lead screw of said lead screw-nut mechanism through a gear drive.

11. The infusion pump according to claim 1, wherein the fastening portion has a buckle having a fastening surface for contacting with the corresponding buckle and fastening the buckle, the fastening surface has a first inclined surface and a second inclined surface, the first inclined surface is disposed at an outer end of the fastening surface, the second inclined surface is connected to an inward end of the first inclined surface, and an inclination angle of the first inclined surface is greater than an inclination angle of the second inclined surface.

12. The infusion pump according to any one of claims 1-11, wherein said latch assembly comprises a latch and a connector, said latch being disposed on said latch, said latch being connected to said connector, said connector being rotatably connected to said output member such that said output member moves said connector and said latch.

13. The infusion pump of claim 12, wherein said latch is an elongated plate-like structure, and said at least two engaging portions are disposed on a side of said latch facing a corresponding catch.

14. The infusion pump of claim 12, wherein said latch and said connector are fixedly attached or integrally formed.

15. The infusion pump of claim 1, wherein said mounting base has a convexly disposed guide portion, said latch rod assembly has a corresponding guide opening, said guide opening is nested on said guide portion, and a wear member is mounted in an area of said guide opening in contact with said guide portion.