CN115137913A - Disposable liquid medicine infusion device - Google Patents

Abstract

The invention discloses a disposable liquid medicine infusion device, which comprises an infusion assembly for infusing liquid medicine into a patient, a push screw rod fixedly connected with the infusion assembly, a push assembly detachably connected with the push screw rod and used for driving the push screw rod to axially move so as to push the infusion assembly to infuse the liquid medicine into the patient, a memory alloy driving assembly connected with the push assembly and used for driving the push assembly to drive the push screw rod to axially move through thermal deformation of memory alloy, and a control assembly electrically connected with the memory alloy driving assembly and used for controlling the memory alloy driving assembly to work, wherein the push assembly, the memory alloy driving assembly and the control assembly are of an integral structure. Through the disposable setting of promotion lead screw and infusion subassembly to keep expensive promotion subassembly, memory alloy drive assembly and control assembly, reduce patient's use cost, and memory alloy thermal deformation's drive mode no longer need use drive components such as motor, reduction gear, is favorable to the miniaturization of device.

Description

Disposable liquid medicine infusion device

Technical Field

The invention relates to the technical field of medical equipment, in particular to a disposable liquid medicine infusion device.

Background

In the treatment process of a patient, the liquid medicine is injected into the body of the patient through the liquid medicine infusion device, and the liquid medicine infusion device of the insulin pump can mediate the patient according to the characteristics of physiological secretion of insulin at different time through simulating a physiological insulin secretion mode, so that the insulin pump is more humanized and more conforms to the liquid medicine infusion device of the physiological insulin secretion mode.

The prior insulin pump is generally provided with a control part, a driving part, a pushing part and an infusion part, wherein the control part controls the driving part to work to provide pushing power for the pushing part and further control the infusion part to infuse insulin into a patient, according to the relevant regulations of medical equipment, after the infusion part completes infusion operation, the infusion part needs to be abandoned in a proper treatment mode, however, the insulin pump is designed by adopting an integral structure for stable and reliable work in the using process, so that the insulin pump is troublesome to disassemble and assemble, and because the infusion part is generally provided with a liquid storage pipe for storing liquid medicine and a piston arranged in the liquid storage pipe, the pushing part adopts a screw rod capable of rotating in a stepping mode to push the piston to move so as to realize liquid medicine infusion, the screw rod extends out in the process of infusing the liquid medicine, but has trouble of contraction and reset after the liquid medicine infusion is completed, due to the reasons, the prior insulin pump only is equivalent to a disposable article and is abandoned after use, the use cost of the patient is greatly increased, the prior insulin pump is expensive for a long time, is not accepted by type 2 diabetes patients and most of insulin pumps, the driving part in the insulin pump adopts a motor, a reduction box, and the light encoder is inconvenient to carry around, so that the infusion part is inconvenient to carry the infusion pump.

Disclosure of Invention

The invention provides a reset driving type liquid medicine infusion device, which solves the technical problems that an insulin pump can only be discarded after being used by a patient, is expensive in repeated use price, large in size and inconvenient to carry and use.

According to one aspect of the invention, the disposable liquid medicine infusion device comprises an infusion assembly for infusing liquid medicine into a patient, a push screw fixedly connected with the infusion assembly, a push assembly detachably connected with the push screw and used for driving the push screw to axially move so as to push the infusion assembly to infuse the liquid medicine into the patient, a memory alloy driving assembly connected with the push assembly and used for driving the push assembly to drive the push screw to axially move through thermal deformation of memory alloy, and a control assembly electrically connected with the memory alloy driving assembly and used for controlling the operation of the memory alloy driving assembly, wherein the push assembly, the memory alloy driving assembly and the control assembly are of an integral structure.

As a further improvement of the above technical solution:

furthermore, the pushing assembly comprises an installation shell, a ratchet mechanism which is rotatably arranged on the installation shell, a screw rod sleeve which is fixedly arranged in the ratchet mechanism and sleeved outside the pushing screw rod, and a swinging piece which is rotatably arranged on the installation shell and arranged correspondingly to the ratchet mechanism, wherein the swinging piece is connected with the memory alloy driving assembly, and the screw rod sleeve comprises a thread driving part which is in threaded connection with the pushing screw rod and is used for driving the pushing screw rod to axially move through a thread structure, and a sliding part which is in sliding connection with the pushing screw rod and is used for pushing the screw rod to slide out of the screw rod sleeve.

Furthermore, the pushing assembly comprises an installation shell, a ratchet mechanism, a screw rod sleeve, a locking mechanism and a swinging piece, the ratchet mechanism is rotatably arranged on the installation shell, the screw rod sleeve is slidably arranged in the ratchet mechanism along the axial direction and sleeved outside the pushing screw rod, the locking mechanism is fixedly arranged on the ratchet mechanism and used for fixing or loosening the screw rod sleeve, the swinging piece is rotatably arranged on the installation shell and arranged corresponding to the ratchet mechanism, the swinging piece is connected with the memory alloy driving assembly, and the screw rod sleeve is in threaded connection with the pushing screw rod.

Further, ratchet mechanism is including rotationally laying the axis of rotation on the installation casing, fixed cover locate the outer ratchet of axis of rotation and along a plurality of ratchets that arrange in proper order of the circumference of ratchet, and the axis of rotation is seted up along the axial and is overlapped sliding chamber of sliding connection with the lead screw.

Further, locking mechanism includes radially wears to locate the axis of rotation along the axis of rotation and is used for stretching into the locking screw rod of sliding chamber in order to support the fixed lead screw cover of pressure, locking screw rod and axis of rotation threaded connection.

Furthermore, the outer wall of the screw rod sleeve is radially provided with a fixing groove which is matched with the locking screw rod in an inserting manner.

Further, the infusion subassembly includes the stock solution spare that is used for storing the liquid medicine with promotion lead screw fixed connection and with the infusion spare intercommunication that is used for infusing the liquid medicine into the patient in vivo.

Further, the liquid storage part comprises a liquid storage shell and a piston arranged in the liquid storage shell, and a connecting groove fixedly connected with the pushing screw rod is concavely arranged on the end face of the piston facing the pushing screw rod.

Furthermore, the memory alloy driving assembly comprises guide posts respectively arranged at two opposite ends of the swinging piece, a memory alloy wire which is rotatably sleeved on the guide posts and is connected with the swinging piece and used for being heated and contracted after being electrified, a first communicating piece which is connected with the first end of the memory alloy wire and is used for being electrically connected with the control assembly so as to enable the first end of the memory alloy wire to be heated and contracted and further drive the swinging piece to swing towards the first end of the memory alloy wire, and a second communicating piece which is connected with the second end of the memory alloy wire and is used for being electrically connected with the control assembly so as to enable the second end of the memory alloy wire to be heated and contracted and further drive the swinging piece to swing towards the second end of the memory alloy wire.

Further, the control assembly comprises a control circuit board and a controller electrically connected with the control circuit board, and the control circuit board is respectively contacted with the first communicating piece and the second communicating piece.

The invention has the following beneficial effects:

the invention relates to a disposable liquid medicine infusion device, which is characterized in that when liquid medicines such as insulin and the like need to be infused into a patient, a control assembly controls a memory alloy driving assembly to work after being electrified, so that memory alloy in the memory alloy driving assembly is heated and deformed to drive a pushing assembly to work, and further a pushing screw rod extends out of a pushing infusion assembly to conduct liquid medicine infusion on the patient, thereby realizing the liquid medicine infusion treatment of the patient.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic view of a disposable medical fluid infusion device in accordance with a preferred embodiment of the present invention;

FIG. 2 is a schematic disassembled view of the disposable medical fluid infusion device of the preferred embodiment of the present invention;

FIG. 3 is a schematic view of a push assembly of the disposable medical fluid infusion device in accordance with the preferred embodiment of the present invention;

FIG. 4 is a schematic view of a portion of the disposable medical fluid infusion device in accordance with a preferred embodiment of the present invention;

fig. 5 is a disassembled schematic view of the disposable medical fluid infusion device in accordance with the preferred embodiment of the present invention.

Illustration of the drawings:

1. an infusion assembly; 2. pushing the screw rod; 3. a pushing assembly; 31. installing a shell; 32. a ratchet mechanism; 321. a rotating shaft; 322. a ratchet wheel; 33. a screw rod sleeve; 331. fixing grooves; 34. a swinging member; 35. a locking mechanism; 4. a memory alloy drive component; 41. a guide post; 42. memorizing alloy wires; 43. a first communication member; 44. a second communicating member; 5. and a control component.

Detailed Description

The embodiments of the invention will be described in detail below with reference to the accompanying drawings, but the invention can be embodied in many different forms, which are defined and covered by the following description.

FIG. 1 is a schematic view of a disposable medical fluid infusion device in accordance with a preferred embodiment of the present invention; FIG. 2 is a schematic disassembled view of the disposable medical fluid infusion device of the preferred embodiment of the present invention; FIG. 3 is a schematic view of a push assembly of the disposable medical fluid infusion device in accordance with the preferred embodiment of the present invention; FIG. 4 is a schematic view of a portion of the disposable medical fluid infusion device in accordance with a preferred embodiment of the present invention; fig. 5 is a disassembled schematic view of the disposable medical fluid infusion device in accordance with the preferred embodiment of the present invention.

As shown in fig. 1 and fig. 2, the disposable liquid medicine infusion device of the present embodiment includes an infusion component 1 for infusing a liquid medicine into a patient, a push screw rod 2 fixedly connected to the infusion component 1, a push component 3 detachably connected to the push screw rod 2 and used for driving the push screw rod 2 to move axially so as to push the infusion component 1 to infuse the liquid medicine into the patient, a memory alloy driving component 4 connected to the push component 3 and used for driving the push screw rod 2 to move axially through thermal deformation of a memory alloy to drive the push component 3, and a control component 5 electrically connected to the memory alloy driving component 4 and used for controlling the operation of the memory alloy driving component 4, wherein the push component 3, the memory alloy driving component 4, and the control component 5 are of an integral structure. Specifically, when liquid medicines such as insulin and the like need to be infused into a patient, the memory alloy driving assembly 4 is controlled by the control assembly 5 to work after being powered on, so that memory alloy in the memory alloy driving assembly 4 is heated and deformed to drive the pushing assembly 3 to work, the pushing screw rod 2 extends out to abut against the pushing infusion assembly 1 to infuse the liquid medicines into the patient, and therefore liquid medicine infusion treatment of the patient is achieved.

As shown in fig. 2-4, in the present embodiment, the pushing assembly 3 includes a mounting housing 31, a ratchet mechanism 32 rotatably disposed on the mounting housing 31, a screw sleeve 33 fixedly disposed in the ratchet mechanism 32 and sleeved outside the pushing screw 2, and a swinging member 34 rotatably disposed on the mounting housing 31 and disposed corresponding to the ratchet mechanism 32, the swinging member 34 is connected to the memory alloy driving assembly 4, the screw sleeve 33 includes a threaded driving portion in threaded connection with the pushing screw 2 for driving the pushing screw 2 to axially move through a threaded structure, and a sliding portion in sliding connection with the pushing screw 2 for sliding the pushing screw 2 out of the screw sleeve 33. Specifically, through memory alloy drive assembly 4 drive swing 34 swing to drive ratchet 32 marching type and rotate, and then drive lead screw cover 33 synchronous rotation, because promote lead screw 2 and infusion subassembly 1 fixed connection, consequently, it is different to promote lead screw 2 and fix for lead screw cover 33 circumference, the screw thread drive division promotes lead screw 2 axial displacement through the helicitic texture drive, realize infusing the liquid medicine infusion of subassembly 1, until promoting lead screw 2 axial displacement to sliding part, the corresponding infusion of liquid medicine finishes this moment, make to promote lead screw 2 can slide outside lead screw cover 33 through sliding part, realize unloading promotion subassembly 3, memory alloy drive assembly 4 and control assembly 5. Optionally, the disposable liquid medicine infusion device comprises a first shell and a second shell which are connected in an assembling mode, the control component 5, the memory alloy driving component 4 and the pushing component 3 are fixedly arranged on the first shell, the pushing screw rod 2 and the infusion component 1 are fixedly arranged on the second shell, after liquid medicine infusion is completed, the first shell and the second shell are disassembled, the second shell is abandoned, the first shell and a new second shell are assembled, and recycling of the first shell, the control component 5, the memory alloy driving component 4 and the pushing component 3 is achieved.

As shown in fig. 5, in the present embodiment, the pushing assembly 3 includes a mounting housing 31, a ratchet mechanism 32 rotatably disposed on the mounting housing 31, a screw rod sleeve 33 axially slidably disposed in the ratchet mechanism 32 and sleeved outside the pushing screw rod 2, a locking mechanism 35 fixedly disposed on the ratchet mechanism 32 for fixing or releasing the screw rod sleeve 33, and a swinging member 34 rotatably disposed on the mounting housing 31 and disposed corresponding to the ratchet mechanism 32, wherein the swinging member 34 is connected to the memory alloy driving assembly 4, and the screw rod sleeve 33 is in threaded connection with the pushing screw rod 2. Specifically, the locking mechanism 35 fixes the screw rod sleeve 33, so that the ratchet mechanism 32 and the screw rod sleeve 33 are fixedly connected through the locking mechanism 35, the swinging member 34 is driven to swing through the memory alloy driving component 4 to drive the ratchet mechanism 32 to rotate step by step, and further the screw rod sleeve 33 is driven to rotate synchronously, because the push screw rod 2 is fixedly connected with the infusion component 1, the push screw rod 2 is circumferentially fixed differently relative to the screw rod sleeve 33 and axially extends out to push the infusion component 1 to infuse liquid medicine, after the liquid medicine infusion is completed, the locking mechanism 35 loosens the screw rod sleeve 33, and the screw rod sleeve 33 can slide out of the ratchet mechanism 32 axially, so that the push component 3, the memory alloy driving component 4 and the control component 5 are dismounted.

As shown in fig. 5, in this embodiment, the ratchet mechanism 32 includes a rotating shaft 321 rotatably disposed on the mounting housing 31, a ratchet 322 fixedly sleeved outside the rotating shaft 321, and a plurality of ratchet teeth sequentially arranged along a circumferential direction of the ratchet 322, and the rotating shaft 321 is axially provided with a sliding cavity slidably connected with the screw rod sleeve 33. Specifically, when the liquid medicine needs to be infused, the screw rod sleeve 33 is inserted into the rotating shaft 321, the locking mechanism 35 locks the screw rod sleeve 33, the swinging piece 34 pushes against the ratchet to drive the ratchet 322 to rotate step by step, at this time, the ratchet 322 drives the rotating shaft 321 to rotate step by step, and then the screw rod sleeve 33 is driven to rotate step by step, so that the extension and pushing of the screw rod 2 are pushed.

As shown in fig. 5, in the present embodiment, the locking mechanism 35 includes a locking screw rod penetrating the rotating shaft 321 along the radial direction of the rotating shaft 321 and extending into the sliding cavity to press the fixed screw sleeve 33, and the locking screw rod is in threaded connection with the rotating shaft 321. Specifically, the locking screw rotates relative to the rotating shaft 321 to extend into the sliding cavity along the radial direction of the rotating shaft 321 to press and fix the screw rod sleeve 33, the rotating shaft 321 can drive the screw rod sleeve 33 to rotate synchronously, or extend out of the rotating shaft 321 along the radial direction of the rotating shaft 321 to release the screw rod sleeve 33, and the screw rod sleeve 33 can slide out of the rotating shaft 321.

As shown in fig. 5, in this embodiment, the outer wall of the screw rod sleeve 33 is radially provided with a fixing groove 331 engaged with the locking screw rod. Specifically, the locking screw is rotated relative to the rotation shaft 321 to extend into the sliding cavity in a radial direction of the rotation shaft 321 and to be inserted into the fixing groove 331, and the rotation shaft 321 may drive the screw sleeve 33 to rotate synchronously.

In this embodiment, the infusion assembly 1 includes a liquid storage part fixedly connected with the push screw rod 2 and used for storing the liquid medicine and an infusion part communicated with the liquid storage part and used for injecting the liquid medicine into the body of the patient. Specifically, the push screw rod 2 pushes the liquid medicine of the liquid storage part into the infusion part, and then the liquid medicine is infused into the body of a patient through the infusion part, so that infusion of the liquid medicine is achieved. Optionally, the infusion part comprises a needle tube, a rubber tube and a needle tube control mechanism for driving a needle of the needle tube to be implanted and pulled out, the needle of the needle tube is preferably a stainless steel needle, so that possible bacterial infection is reduced, the needle tube is connected with the liquid storage part through a hose, and liquid is supplied to the needle tube from the liquid storage part; the rubber tube is sleeved outside the needle tube, the needle tube and the rubber tube can move relatively, when infusion is needed to be carried out on a patient, the needle tube control mechanism controls the needle head of the needle tube to extend out of the rubber tube, after the infusion is finished, the needle head on the needle tube is controlled by the needle tube control mechanism to be retracted into the rubber tube again, and pain of the patient caused by the fact that the needle head exists in the body for a long time is reduced. Optionally, the bottom plate is attached to one side of the body of the patient and is provided with an attaching piece, a needle hole is formed in the attaching piece, a needle head on the needle tube can penetrate through the needle hole to conduct medicine infusion on the patient, the long catheter is replaced by the attaching mode, and the phenomenon that the patient is uncomfortable due to friction between the catheter and the body of the user when the long catheter is used and the fact that the long catheter is possibly hung on other objects and the like is avoided. Optionally, the needle tube control mechanism comprises a mounting frame, a sliding block assembly, an inclined surface block assembly and an elastic assembly, the mounting frame is arranged in the housing, the elastic assembly comprises a screw, one end of the mounting frame is provided with the screw, a torsion spring is sleeved outside the screw, the outside of the screw is rotatably connected with a herringbone arm, the two arms of the herringbone arm are rotatably connected, the rotation of the torsion spring can drive the herringbone arm to extend or contract, the herringbone arm comprises a first connecting rod rotatably connected outside the screw and a second connecting rod rotatably connected with the first connecting rod, the outer end of the second connecting rod is rotatably connected with a sliding part on the sliding block assembly, the sliding assembly comprises a first sliding block, a second sliding block and a sliding rail, the outer end of the second connecting rod is rotatably connected with the first sliding block, the second connecting rod can drive the first sliding block to slide on the sliding rail of the sliding block assembly, the inclined surface block assembly penetrates through the housing, one end of the inclined surface block assembly located inside the housing is connected with a block, the first sliding block is located between the first sliding block and the second sliding block, the block is divided into two use states, one state is that when the inclined surface block assembly is pulled outwards, the torsion spring is rotated to reset, and the sliding block is reset, and the sliding block drives the second sliding block to move on the sliding block in the process of the herringbone arm, so as to drive the sliding block to move the sliding block; the other is that when the inclined plane stop block assembly is pressed down, the stop block pushes the first sliding block to reset, so that the contact position of the stop block and the first sliding block is in inclined plane fit, the reset of the first sliding block is facilitated, when the stop block pushes the first sliding block to be completely reset, the stop block is positioned between the first sliding block and the second sliding block to separate the first sliding block and the second sliding block, at the moment, the torsion spring is twisted, and the torsion spring has the tendency of pushing the first sliding block to move in a reset manner, so that the first sliding block is pushed to accumulate force next time; be equipped with first conduction groove on the first slider, be equipped with the second conduction groove on the second slider, the second conduction groove is used for holding the rubber tube, is equipped with the adaptation chamber on the second slider, is equipped with salient in the location portion of rubber tube on the rubber tube, and location portion adaptation is in the adaptation intracavity, and the needle tubing penetrates in the rubber tube through this location portion. Preferably, after the infusion is completed, the rubber tube is reserved in a reserved tube on the skin of the patient, the needle tube is retracted into the shell, so that the problem of complications caused by the fact that the needle is reserved in the patient is solved, specifically, a blocking hole is formed in one end, far away from the first sliding block, of the second sliding block, a spring thimble is correspondingly arranged on the front cover, after the second sliding block slides to a certain position, the spring thimble pops out and is inserted into the blocking hole, the second sliding block is fixed, so that the rubber tube cannot be driven to retract, the first sliding block resets and retracts under the retraction effect of the herringbone arm, the needle tube is finally retracted into the rubber tube, and when the next infusion is performed, the needle tube is pushed out through the operation of the button piece and the movement of the first sliding block.

In this embodiment, the stock solution spare includes the stock solution casing and lays the piston in the stock solution casing, and the piston is equipped with and promotes 2 fixed connection's of lead screw spread groove towards the terminal surface concave of promoting lead screw 2. Specifically, push screw rod 2 is fixedly connected through the connecting groove to drive push screw rod 2 to extend out and support at push assembly 3, so as to guide the liquid medicine in the liquid storage shell into the infusion piece. Optionally, a first end of the push screw rod 2 is provided with a first external thread in threaded connection with the push assembly 3, a second end of the push screw rod 2 is provided with a second external thread, the turning directions of the first external thread and the second external thread are opposite, and the inner wall of the connecting groove is provided with an internal thread in threaded connection with the second external thread.

As shown in fig. 1, fig. 2 and fig. 5, in the present embodiment, the memory alloy driving assembly 4 includes guide posts 41 respectively disposed at two opposite ends of the swinging member 34, a memory alloy wire 42 rotatably sleeved on the guide posts 41 and connected to the swinging member 34 for thermal contraction after being energized, a first communicating member 43 connected to a first end of the memory alloy wire 42 and electrically connected to the control assembly 5 for enabling the first end of the memory alloy wire 42 to be thermally contracted and further driving the swinging member 34 to swing toward the first end of the memory alloy wire 42, and a second communicating member 44 connected to a second end of the memory alloy wire 42 and electrically connected to the control assembly 5 for enabling the second end of the memory alloy wire 42 to be thermally contracted and further driving the swinging member 34 to swing toward the second end of the memory alloy wire 42. Specifically, the control assembly 5 is communicated with the first communicating member 43 and disconnected from the second communicating member 44, so that the first end of the memory alloy wire 42 is electrified and heated to contract, and the swinging member 34 is driven to swing towards the first end of the memory alloy wire 42; the control component 5 is disconnected from the first communicating member 43 and communicated with the second communicating member 44, so that the second end of the memory alloy wire 42 is electrified and heated to contract, and further the swinging member 34 is driven to swing towards the second end of the memory alloy wire 42, so as to realize the reciprocating swing of the swinging member 34 by the secondary cycle reciprocating. It should be understood that the specific material of the memory alloy wire 42 is well known to those skilled in the art, and will not be described herein too much as long as it can be shrunk by heating after being energized.

In this embodiment, the control assembly 5 includes a control circuit board and a controller electrically connected to the control circuit board, and the control circuit board is in contact with the first communicating member 43 and the second communicating member 44, respectively. Specifically, the controller controls the control circuit board to realize that when the first communicating member 43 is electrified with the control circuit board, the second communicating member 44 is disconnected with the control circuit board to drive the swinging member 34 to swing towards the first end of the memory alloy wire 42; or when the second communicating piece 44 is electrified with the control circuit board, the first communicating piece 43 is disconnected with the control circuit board, and the swinging piece 34 is driven to swing towards the second end of the memory alloy wire 42. It should be understood that the specific structure of the control circuit board belongs to the known technology of the person skilled in the art, and will not be described in too much here. Optionally, the controller is a PLC controller. It should be understood that the specific structure of the PLC controller belongs to the known technology of those skilled in the art, and will not be described in too much detail herein.

As shown in fig. 3, in the present embodiment, the mounting housing 31 includes a connecting column disposed along the height direction of the mounting housing 31, the swinging member 34 is rotatably sleeved on the connecting column, and the swinging member 34 includes a crimping portion disposed between the two guiding columns 41 and crimped with the memory alloy wire 42 for swinging along with the thermal contraction of the memory alloy wire 42, and a pushing portion disposed corresponding to the ratchet mechanism 32 for pushing the ratchet mechanism 32 to rotate along with the swinging of the crimping portion. Specifically, the memory alloy wire 42 is repeatedly heated and contracted toward the first end of the memory alloy wire 42 or toward the second end of the memory alloy wire 42 to drive the pressing part to repeatedly swing, and further drive the swinging part 34 to repeatedly swing, so as to drive the pushing part to repeatedly push the ratchet mechanism 32, thereby realizing the rotation of the ratchet mechanism 32.

As shown in fig. 3, in the present embodiment, the end of the mounting housing 31 away from the crimping portion is provided with a plurality of limiting posts arranged along the height direction of the mounting housing 31, the plurality of limiting posts are arranged at intervals along the length direction of the mounting housing 31 and form a limiting gap, and the end of the swinging member 34 away from the crimping portion is provided with a limiting portion extending along the length direction of the swinging member 34 and extending into the limiting gap, and the limiting portion is used for abutting against the limiting posts to limit the swinging range of the swinging member 34 during the swinging process of the swinging member 34. Specifically, in the swing process of the swing piece 34, the limit portion swings synchronously, and the limit portion stretches into the limit gap and is abutted and limited by the limit column, so that the swing piece can only swing in the limit gap, the swing range of the swing piece 34 is correspondingly limited, the situation that the swing range of the swing piece 34 is too large, the push portion is separated from the push area of the ratchet is avoided, interference and jamming caused by blocking of the ratchet are possible, and the stability and reliability of the movement of the swing piece 34 are guaranteed.

As shown in fig. 3, in this embodiment, a plurality of limiting protrusions formed by extending along the width direction of the installation housing 31 are arranged on the side wall of the installation housing 31, the plurality of limiting protrusions are arranged at intervals along the length direction of the installation housing 31 to form a limiting groove, the swinging member 34 further includes a limiting hole arranged along the thickness direction of the swinging member 34 and corresponding to the limiting groove, and a limiting block arranged in the limiting hole, and the limiting end of the limiting block extends into the limiting groove and is used for abutting against the limiting protrusions to limit the swinging range of the swinging member 34 in the swinging process of the swinging member 34. Specifically, in the swing process of the swing piece 34, the limit block swings synchronously, and the limit end of the limit block extends into the limit groove and is limited by the abutting of the limit protrusion, so that the limit end can only swing in the limit groove, the swing range of the swing piece 34 is correspondingly limited, the situation that the swing range of the swing piece 34 is too large, the push part is separated from the push area of the ratchet, and the interference and the jamming of the ratchet are possibly caused by the obstruction of the ratchet is avoided.

As shown in fig. 3, in this embodiment, a sensor electrically connected to the controller and used for transmitting a feedback signal to the controller after abutting against the limiting portion is disposed on the limiting column. Specifically, when the control circuit board is powered on the first communicating piece 43 and disconnected from the second communicating piece 44, so that the swinging piece 34 swings towards the first end of the memory alloy wire 42, the limiting part swings towards the limiting post located at the second end of the memory alloy wire 42 until the limiting part abuts against the limiting post, the sensor transmits a feedback signal to the controller, which indicates that the swinging piece 34 swings in place, at the moment, the controller controls the control circuit board to be disconnected from the first communicating piece 43 and powered on the second communicating piece 44, so that the swinging piece 34 swings towards the second end of the memory alloy wire 42, correspondingly, the limiting part swings towards the limiting post located at the first end of the memory alloy wire 42, and until the limiting part abuts against the limiting post, the sensor transmits a feedback signal to the controller, which indicates that the swinging piece 34 swings in place; the swinging range of the swinging piece 34 is limited by the sensor, and the swinging piece 34 is prevented from being damaged due to excessive swinging.

As shown in fig. 3, in the present embodiment, the control assembly 5 further includes a transmission member sleeved on the connection column for contacting the controller and the swinging member 34 respectively to transmit current. Specifically, the current after the first communicating member 43 or the second communicating member 44 and the control circuit board are electrified flows into the controller after sequentially flowing through the memory alloy wire 42, the swinging member 34 and the transmission member, so as to form a complete current loop, and ensure that the memory alloy wire 42 is electrified and deformed by heat. Optionally, the transmission member is a compression spring.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. The utility model provides a formula liquid medicine infusion device can throw, a serial communication port, including infusion subassembly (1) that is used for infusing the liquid medicine to the patient internal, with infusion subassembly (1) fixed connection's push screw pole (2), can dismantle with push screw pole (2) and be connected be used for driving push screw pole (2) axial displacement and carry out liquid medicine infusion with pushing infusion subassembly (1) to the patient push assembly (3), be used for driving memory alloy drive assembly (4) that push screw pole (2) axial displacement and control assembly (5) that are used for controlling memory alloy drive assembly (4) work that are connected with push assembly (3) through memory alloy thermal deformation with drive push assembly (3) and be connected with memory alloy drive assembly (4) electricity, push assembly (3), memory alloy drive assembly (4) and control assembly (5) are integral structure.

2. The disposable liquid medicine infusion device according to claim 1, wherein the pushing assembly (3) comprises a mounting housing (31), a ratchet mechanism (32) rotatably disposed on the mounting housing (31), a screw sleeve (33) fixedly disposed in the ratchet mechanism (32) and sleeved outside the pushing screw (2), and a swinging member (34) rotatably disposed on the mounting housing (31) and disposed corresponding to the ratchet mechanism (32), the swinging member (34) is connected with the memory alloy driving assembly (4), the screw sleeve (33) comprises a threaded driving portion in threaded connection with the pushing screw (2) for driving the pushing screw (2) to axially move through a threaded structure, and a sliding portion in sliding connection with the pushing screw (2) for pushing the pushing screw (2) to slide out of the screw sleeve (33).

3. The disposable liquid medicine infusion device according to claim 1, wherein the pushing assembly (3) comprises a mounting housing (31), a ratchet mechanism (32) rotatably disposed on the mounting housing (31), a screw sleeve (33) axially slidably disposed in the ratchet mechanism (32) and sleeved outside the pushing screw (2), a locking mechanism (35) fixedly disposed on the ratchet mechanism (32) and used for fixing or releasing the screw sleeve (33), and a swinging member (34) rotatably disposed on the mounting housing (31) and arranged corresponding to the ratchet mechanism (32), wherein the swinging member (34) is connected with the memory alloy driving assembly (4), and the screw sleeve (33) is in threaded connection with the pushing screw (2).

4. The disposable liquid drug infusion device according to claim 3, wherein the ratchet mechanism (32) comprises a rotating shaft (321) rotatably disposed on the mounting housing (31), a ratchet (322) fixedly sleeved outside the rotating shaft (321), and a plurality of ratchet teeth sequentially arranged along a circumferential direction of the ratchet (322), and the rotating shaft (321) is axially provided with a sliding cavity slidably connected with the screw rod sleeve (33).

5. The disposable liquid drug infusion device according to claim 4, wherein the locking mechanism (35) comprises a locking screw rod penetrating the rotational shaft (321) in a radial direction of the rotational shaft (321) and extending into the sliding cavity to press the fixed screw sleeve (33), the locking screw rod being in threaded connection with the rotational shaft (321).

6. The disposable liquid medicine infusion device of claim 5, wherein the outer wall of the screw rod sleeve (33) is radially provided with a fixing groove (331) which is in inserted fit with the locking screw rod.

7. A disposable medical fluid infusion device according to any of claims 1-6, wherein the infusion assembly (1) comprises a reservoir fixedly connected to the push screw (2) for storing a medical fluid and an infusion member communicating with the reservoir for infusing a medical fluid into a patient.

8. The disposable liquid medicine infusion device according to claim 7, wherein the liquid storage member comprises a liquid storage housing and a piston disposed in the liquid storage housing, and a connecting groove fixedly connected with the push screw (2) is concavely provided on an end surface of the piston facing the push screw (2).

9. The disposable liquid medicine infusion device according to any one of claims 2 to 6, wherein the memory alloy driving assembly (4) comprises guide posts (41) respectively disposed at opposite ends of the swinging member (34), a memory alloy wire (42) rotatably sleeved on the guide posts (41) and connected with the swinging member (34) for thermal contraction after being energized, a first communicating member (43) connected with a first end of the memory alloy wire (42) and electrically connected with the control assembly (5) so that the first end of the memory alloy wire (42) is thermally contracted to drive the swinging member (34) to swing towards the first end of the memory alloy wire (42), and a second communicating member (44) connected with a second end of the memory alloy wire (42) and electrically connected with the control assembly (5) so that the second end of the memory alloy wire (42) is thermally contracted to drive the swinging member (34) to swing towards the second end of the memory alloy wire (42).

10. The disposable liquid drug infusion device of claim 9 wherein the control assembly (5) comprises a control circuit board and a controller electrically connected to the control circuit board, the control circuit board being in contact with the first communicating member (43) and the second communicating member (44), respectively.

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