CN117679580A - Insulin pump and infusion driving device thereof - Google Patents

Abstract

The application discloses an infusion driving device, which relates to the technical field of medical appliances; the infusion driving device comprises a memory metal piece, a power supply passage and an infusion mechanism, wherein the memory metal piece is communicated with the power supply passage, the memory metal piece is used for being deformed to output power when the power supply passage is electrified, the power output end of the memory metal piece is connected with the power input end of the infusion mechanism, and the infusion mechanism is used for realizing the infusion of medicines under the driving of the memory metal piece. The infusion driving device enables the insulin pump to achieve more portable and accurate drug infusion in the patch type product.

Description

Insulin pump and infusion driving device thereof

Technical Field

The application relates to the technical field of medical instruments, in particular to an infusion driving device. And to an insulin pump.

Background

An insulin pump is a medical device for simulating the secretory function of the pancreas, and is capable of infusing insulin into a patient in a dosage required by the human body.

Insulin pumps are typically composed of an infusion drive unit, a piston and a reservoir, with the piston delivering the drug in the reservoir to a target site by pushing the piston with the infusion drive unit. At present, the inventor finds that the paste type insulin pump product has the problems of smaller volume and difficult integration of a motor driving device, and the infusion driving device adopting the traditional motor structure can not meet the high-precision drug infusion requirement of the paste type insulin pump product, thereby improving the insulin pump and the infusion driving device thereof.

Disclosure of Invention

It is an object of the present application to provide an infusion drive unit enabling an insulin pump to achieve a more portable, accurate infusion of a drug in a patch-type product. It is another object of the present application to provide an insulin pump that includes an infusion drive device.

To achieve the above object, the present application provides an infusion driving device, the infusion driving device includes a memory metal piece, a power supply path and an infusion mechanism, the memory metal piece is communicated with the power supply path, the memory metal piece is used for deforming to output power when the power supply path is electrified, a power output end of the memory metal piece is connected with a power input end of the infusion mechanism, and the infusion mechanism is used for realizing the infusion of medicines under the driving of the memory metal piece.

In some embodiments, the infusion mechanism comprises a driving plectrum, a transmission part and a piston, wherein the driving plectrum is connected with the memory metal part, the driving plectrum is used for acting under the driving of the memory metal part, the piston is in transmission connection with the driving plectrum through the transmission part, and the piston is used for realizing the infusion of medicines.

In some embodiments, the outer circumference of the transmission member is provided with ratchet teeth, the ratchet teeth are matched with the driving shifting piece, the ratchet teeth are used for stepping movement under the action of the driving shifting piece, the inner circumference of the transmission member is provided with a thread surface, the thread surface is matched with a threaded rod of the piston, and the thread surface is used for driving the piston to move when the transmission member rotates.

In some embodiments, the infusion mechanism further comprises a non-return paddle and a return spring, the non-return paddle is matched with the ratchet teeth, the non-return paddle is used for limiting rotation of the ratchet teeth, the return spring is connected with the driving paddle, and the return spring is used for driving the driving paddle to restore to an initial position for driving the ratchet teeth when the power supply passage is powered off so as to realize reciprocating motion of the driving paddle under the action of the power supply passage and the return spring.

In some embodiments, the infusion mechanism further comprises two travel contact sensors disposed at a start point and an end point of the reciprocating motion of the drive paddle, respectively.

In some embodiments, the memory metal part, the driving pulling piece and the reset spring are all made of conductive materials, and the reset spring, the driving pulling piece and the memory metal part are sequentially connected to form the power supply passage.

In some embodiments, the infusion mechanism further comprises a first power contact blade connected to the return spring and a second power contact blade connected to the memory metal piece.

In some embodiments, the infusion drive device further comprises a base on which the memory metal piece, the power supply path, and the infusion mechanism are mounted, the memory metal piece and the power supply path being located on a back side of the base.

In some embodiments, the memory metal part is in a wire shape, a sliding wheel is arranged on the back side of the base, and the memory metal part is wound on the sliding wheel and is tensioned.

The application also provides an insulin pump, including above-mentioned infusion drive arrangement, insulin pump still includes the medicine storage storehouse, the medicine storage storehouse is provided with pushes away medicine mouth and play medicine mouth, push away the medicine mouth be used for with infusion mechanism cooperation, through infusion mechanism will the inside liquid medicine in medicine storage storehouse is released go out the medicine mouth.

For above-mentioned background art, the infusion drive arrangement that this application provided includes memory metal spare, power supply passageway and infusion mechanism, and memory metal spare intercommunication is on the power supply passageway, and memory metal spare is used for taking place deformation in order to export power when the power supply passageway circular telegram, and memory metal spare's power take off end links to each other with infusion mechanism's power input end, and infusion mechanism is used for realizing the infusion to the medicine under memory metal spare's drive.

The infusion driving device can be assembled with the medicine storage bin to form a complete insulin pump product, and when the infusion driving device is used, the memory metal piece is heated to restore the memory shape principle through the power on and power off of the power supply passage, so that the medicine infusion is realized. Specifically, in the initial state, the power supply passage is not electrified, the memory metal piece is in a stretched state, the power output end of the memory metal piece is positioned at the initial position, and the memory metal piece does not input power to the infusion mechanism; when the power supply passage is electrified, the memory metal piece generates heat under the external condition of circuit conduction and the resistance condition of the memory metal piece, the memory effect of the memory metal piece is triggered, the memory metal piece is changed into a contracted state from an expanded state, the power output end of the memory metal piece starts to move from an initial position, and the memory metal piece inputs power to the infusion mechanism, so that the infusion mechanism infuses medicines under the drive of the memory metal piece; alternatively, the memory metal element may be changed from a contracted state to a stretched state under reduced temperature conditions in preparation for the next infusion of the drug, following loss of power to the power supply path.

In combination with the above structure and process description, it can be seen that the infusion driving device has at least the following advantages: the infusion driving device adopts the memory metal piece as a driving structure, and can greatly reduce the volume of the insulin pump by adopting an innovative mechanical structure design, so that the insulin pump is more compact and lighter; the infusion driving device utilizes reliable materials such as memory alloy and the like, and can improve the stability and the reliability of the insulin pump by simplifying the mechanical structure, thereby enhancing the practicability of the insulin pump in medical application; based on this, the infusion drive unit enables a more portable, accurate infusion of the drug in the patch product by the insulin pump.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort to a person skilled in the art.

FIG. 1 is a schematic diagram of an insulin pump according to an embodiment of the present disclosure;

FIG. 2 is a schematic view of the insulin pump of FIG. 1 with the bottom up;

fig. 3 is a schematic structural view of an infusion driving device according to an embodiment of the present disclosure;

fig. 4 is a schematic structural view of an infusion driving device according to an embodiment of the present disclosure with a base removed;

FIG. 5 is a schematic view of the infusion drive unit of FIG. 4 with the bottom up;

fig. 6 is a schematic structural diagram of a power supply path according to an embodiment of the present disclosure;

fig. 7 is a schematic structural diagram of a base provided in an embodiment of the present application;

FIG. 8 is a schematic view of the base of FIG. 7 with the bottom upward;

FIG. 9 is a schematic diagram of a piston according to an embodiment of the present disclosure;

fig. 10 is a schematic structural view of a drug storage bin according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a piston and a drug storage bin combined according to an embodiment of the present application.

Wherein:

1. a memory metal piece; 2. an infusion mechanism; 21. driving the poking plate; 22. a transmission member; 221. ratchet teeth; 23. a piston; 231. a threaded rod; 232. a seal ring; 24. a non-return shifting piece; 25. a return spring; 26. a travel contact sensor; 27. a first power supply contact metal sheet; 28. a second power contact metal sheet; 3. a base; 31. a sliding wheel; 32. a fixed rod; 33. a mounting groove; 4. a medicine storage bin; 41. a medicine outlet; 42. and (5) mounting the bulge.

Detailed Description

The application relates to the technical field of medical equipment, in particular to the field of insulin infusion pumps (the meaning of insulin infusion pumps is the same as that of insulin pumps), and in particular relates to an innovative design of a miniaturized and high-efficiency driving mechanism for an applied insulin pump product.

In the treatment of diabetics, insulin pumps are a critical medical device for mimicking the insulin secretion function of the pancreas. The existing insulin pump mainly adopts split type design, but the background of the application is focused on a pasting type insulin pump, and the problems of large size and portability of the traditional product are solved. The device relates to the monitoring of the drug administration driving transmission state, the accuracy and the stability of drug infusion and the design of a miniaturized driving mechanism.

Despite the significant advances made in the field of infusion of medical fluids by existing insulin pump products, there are also drawbacks that can be ameliorated by the innovative solutions provided by the present application. The following are some of the disadvantages of the prior art:

electromagnetic radiation: the use of an electric pump may involve an electric motor, which may lead to problems with electromagnetic radiation, raising patient concerns. The application adopts the memory alloy and the mechanical structure, so that the radiation level is possibly reduced, and the use safety is improved.

The cost is high: conventional electric pumps typically include multiple complex components such as motors, reduction gear sets, and the like, which are relatively expensive to manufacture and maintain. The memory alloy and other materials with relatively low cost and the simplified mechanical structure adopted by the application are expected to reduce the overall cost of the product.

Volume and weight: electric pumps, because of the need for a motor and reduction gear set, can be relatively large and heavy, and are not well suited for patient portability. The mechanical structure and lightweight design of the present application may help reduce the volume and weight of the device.

Precision limitation: electric pumps have some limitations on the accuracy of drug infusion, especially at low flow and low dose infusions, which can be difficult to regulate accurately. This application adopts step-by-step mechanical structure, probably realizes the accurate control to liquid medicine transportation more easily.

Maintenance is difficult: the motor and electronics inside the electric pump make maintenance relatively difficult, and users often require technical expertise. The device adopts a simplified mechanical structure, and the maintenance difficulty of the device can be reduced.

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

Referring to fig. 1 to 3, fig. 1 is a schematic structural diagram of an insulin pump according to an embodiment of the present application, fig. 2 is a schematic structural diagram of an insulin pump with an upward bottom in fig. 1, and fig. 3 is a schematic structural diagram of an infusion driving device according to an embodiment of the present application.

In a specific implementation manner, the infusion driving device provided by the embodiment of the application comprises a memory metal piece 1, a power supply path and an infusion mechanism 2, wherein the memory metal piece 1 is communicated with the power supply path, the memory metal piece 1 is used for deforming to output power when the power supply path is electrified, the power output end of the memory metal piece 1 is connected with the power input end of the infusion mechanism 2, and the infusion mechanism 2 is used for realizing the infusion of medicines under the driving of the memory metal piece 1.

It should be noted that, the memory metal member 1 in this embodiment is made of a memory metal material, and the memory metal is a metal alloy capable of generating a shape memory effect by heating. Shape memory effect refers to the property of a material that is capable of returning to its original shape by an external stimulus (e.g., a temperature change) after undergoing a shape change, and the expanded state and the contracted state refer to the two states of a memory alloy, corresponding to the different shapes of the alloy, respectively. Based on this, in the present embodiment, the memory metal piece 1 generates heat by energizing the power supply path, and the memory metal piece 1 achieves transition between the expanded state and the contracted state by the shape memory effect, thereby driving input of power to the infusion mechanism 2 for driving the insulin infusion pump, achieving infusion of the drug.

The infusion driving device can be assembled with the medicine storage bin 4 to form a complete insulin pump product, and when the infusion driving device is used, the memory shape principle of the memory metal piece 1 is recovered by heating through the power on and power off of a power supply passage, so that the medicine infusion is realized. Specifically, in the initial state, the power supply passage is not electrified, the memory metal piece 1 is in a stretched state, the power output end of the memory metal piece 1 is positioned at the initial position, and the memory metal piece 1 does not input power to the infusion mechanism 2; when the power supply passage is electrified, the memory metal piece 1 generates heat under the external condition of circuit conduction and the resistance condition of the memory metal piece, the memory metal piece 1 is triggered to change from a stretching state to a shrinking state, the power output end of the memory metal piece 1 starts to move from an initial position, and the memory metal piece 1 inputs power to the infusion mechanism 2, so that the infusion mechanism 2 infuses medicine under the driving of the memory metal piece 1; alternatively, the memory metal part 1 is changed from the contracted state to the expanded state under a reduced temperature condition by a subsequent loss of power to the power supply path, and is ready for the next infusion of the drug.

In combination with the above structure and process description, it can be seen that the infusion driving device has at least the following advantages: the infusion driving device adopts the memory metal piece 1 as a driving structure, and can greatly reduce the volume of the insulin pump by adopting an innovative mechanical structure design, so that the insulin pump is more compact and lighter; the infusion drive device utilizes reliable materials such as memory alloy and the like, and can improve the stability and the reliability of the insulin pump by simplifying the mechanical structure, thereby enhancing the practicability of the insulin pump in medical application.

In summary, the application aims to solve the problems of small volume and difficult integration of motor driving devices in the application type insulin pump product. The traditional paste type insulin pump is difficult to accommodate a large-scale driving device due to limited volume, and miniaturization and portability of products are affected. To cope with this problem, the present application innovatively exploits the unique properties of memory metals, which are transformed into shape memory by generating heat by energizing a current. This small, efficient drive mechanism design allows the insulin infusion pump to achieve a more portable, accurate infusion of medication in the patch-type product. By this innovative solution, the present application aims to improve the portability and the use effect of insulin infusion products.

It should be noted that, except for the description of the improvement of the insulin pump and the infusion driving device thereof in the present embodiment, reference may be made to the prior art for the non-description, and the description is not repeated here.

Referring to fig. 4 and 5 in conjunction with fig. 1 to 3, fig. 4 is a schematic structural view of an infusion driving device with a base removed according to an embodiment of the present application, and fig. 5 is a schematic structural view of the infusion driving device with the bottom facing upwards in fig. 4.

In some embodiments, the infusion mechanism 2 comprises a driving plectrum 21, a transmission member 22 and a piston 23, wherein the driving plectrum 21 is connected with the memory metal part 1, the driving plectrum 21 is used for acting under the driving of the memory metal part 1, the piston 23 is in transmission connection with the driving plectrum 21 through the transmission member 22, and the piston 23 is used for realizing the infusion of medicines.

In this embodiment, the driving paddle 21 is equivalent to the power input end of the infusion mechanism 2, and the driving paddle 21 acts under the driving of the memory metal piece 1 through the connection relationship between the driving paddle 21 and the memory metal piece 1; the transmission part 22 is used as a force transmission structure between the driving shifting piece 21 and the piston 23, and transmits the action of the memory metal part 1 to the piston 23, so that the piston 23 finally acts under the driving of the memory metal part 1, and further the infusion of the medicine is realized.

When the infusion driving device is assembled with the medicine storage bin 4 to form a complete insulin pump product, the piston 23 and the medicine storage bin 4 form a stable sealing relation, and when the piston 23 acts relative to the medicine storage bin 4, medicines in the medicine storage bin 4 are pushed and conveyed by the piston 23.

Alternatively, the outer circumference of the transmission member 22 is provided with ratchet teeth 221, the ratchet teeth 221 are engaged with the driving dial 21, the ratchet teeth 221 are used for stepping movement under the action of the driving dial 21, the inner circumference of the transmission member 22 is provided with a threaded surface, the threaded surface is engaged with the threaded rod 231 of the piston 23, and the threaded surface is used for driving the piston 23 to move when the transmission member 22 rotates.

In this embodiment, the ratchet teeth 221 and the threaded surface can be considered as two structural forms on the driving member 22, the relationship of the driving member 22 and the threaded rod 231 being similar to a nut and a screw. The ratchet teeth 221 are used for stepping rotation at a fixed stepping angle under the action of the driving shifting piece 21, and the threaded surface is used for converting the rotation of the ratchet teeth 221 into the movement of the piston 23, so that the piston 23 precisely moves according to the stepping distance corresponding to the stepping angle.

It should be noted that this embodiment is only given as an alternative to the infusion mechanism 2 and is not meant to be the only implementation of the infusion mechanism 2, and thus other alternatives to the infusion mechanism 2 are intended to fall within the scope of the present application.

In a specific embodiment, taking the infusion mechanism 2 including the driving plectrum 21, the transmission member 22 and the piston 23 as an example, further, the infusion mechanism 2 further includes a check plectrum 24 and a return spring 25, the check plectrum 24 is matched with the ratchet teeth 221, the check plectrum 24 is used for limiting the rotation of the ratchet teeth 221, the return spring 25 is connected with the driving plectrum 21, and the return spring 25 is used for driving the driving plectrum 21 to return to the initial position of the driving ratchet teeth 221 when the power supply path is powered off, so as to realize the reciprocating motion of the driving plectrum 21 under the actions of the power supply path and the return spring 25.

In this embodiment, the movement principle of the infusion driving device is mainly divided into three parts, including the memory metal piece 1 and the return spring 25 to make the driving pulling piece 21 reciprocate, the driving pulling piece 21 and the non-return pulling piece 24 make the transmission piece 22 rotate, and the transmission piece 22 drives the piston 23 to push out along the axial direction.

Taking the reciprocating motion of the driving poking piece 21 as an example, when the device is used, a power supply passage is electrified, the memory metal piece 1 generates heat due to a resistor to trigger the memory effect of the memory metal piece 1, the memory metal piece 1 is changed from a stretching state to a shrinking state, the memory metal piece 1 pulls the driving poking piece 21 to move from a starting point to an ending point, the reset spring 25 is pulled by the driving poking piece 21 to increase the deformation elasticity, the driving poking piece 21 is embedded into the ratchet teeth 221 to form engagement, and the driving poking piece 21 drives the ratchet teeth 221 to rotate to realize the stepping rotation of the ratchet teeth 221; then the power supply channel loses power, the memory metal piece 1 is changed from a contracted state to an expanded state after being cooled, the driving plectrum 21 moves from the end point to the starting point under the action of the reset spring 25, the driving plectrum 21 is separated from the engagement with the ratchet teeth 221 and slides to the next-stage teeth of the ratchet teeth 221, so that when the driving plectrum 21 moves from the starting point to the end point again, the driving plectrum 21 is embedded into the next-stage teeth of the ratchet teeth 221, and the next stepping rotation of the ratchet teeth 221 is realized.

Taking the rotation of the transmission member 22 as an example, in the initial case, the power supply passage is not electrified, the non-return shifting plate 24 is embedded into the ratchet teeth 221 to avoid the ratchet teeth 221 from rotating, and the driving shifting plate 21 and the ratchet teeth 221 do not form a jacking engagement; after the power supply passage is electrified, the driving shifting piece 21 is propped against the embedded ratchet teeth 221 to form engagement, the ratchet teeth 221 are driven to rotate to form stepping of the ratchet teeth 221, the current engagement between the non-return shifting piece 24 and the ratchet teeth 221 fails, and the non-return shifting piece 24 slides into the next stage tooth of the ratchet teeth 221; after the power supply passage is powered off, the driving shifting piece 21 is separated from the jacking engagement with the ratchet teeth 221 under the action of the reset spring 25 and slides to the next stage tooth of the ratchet teeth 221, and at the moment, the non-return shifting piece 24 is in jacking engagement with the ratchet teeth 221 so as to avoid the rotation of the transmission piece 22 due to friction force in the stroke of separating the driving shifting piece 21 from the ratchet teeth 221.

Taking the pushing movement of the piston 23 along the axial direction as an example, along with the rotation of the transmission member 22, the threaded rod 231 generates axial displacement due to the action of threads, so that the piston 23 moves axially along the threaded rod 231 in the medicine storage bin 4, and the piston 23 pushes medicine in the medicine storage bin 4 to realize infusion.

In some embodiments, the infusion mechanism 2 further includes travel contact sensors 26, the number of travel contact sensors 26 being two and disposed at the start and end of the reciprocation of the drive paddle 21, respectively.

In this embodiment, the two travel contact sensors 26 are connected to the driving paddle 21, so that the movement position of the driving paddle 21 can be monitored, and further the reciprocating movement of the driving paddle 21 can be controlled. Illustratively, initially, the power supply path is not energized, the travel contact sensor 26 of the starting point is in conduction with the driving paddle 21, the memory metal part 1 is in the stretched state, the driving paddle 21 is not engaged with the ratchet teeth 221, the ratchet teeth 221 are prevented from rotating under the limitation of the non-return paddle 24, and the transmission member 22 and the piston 23 are not moved; the power supply passage is electrified, at the moment, the two travel contact point sensors 26 are not communicated with the driving poking piece 21, the memory metal piece 1 changes from an unfolding state to a shrinkage state, and the memory metal piece 1 pulls the driving poking piece 21 to move towards a terminal point; the travel contact sensor 26 reaching the end point is communicated with the driving shifting piece 21, the driving shifting piece 21 is meshed with the ratchet teeth 221 and then drives the ratchet teeth 221 to rotate step by step, and the piston 23 drives the medicine to realize infusion under the drive of the transmission piece 22; then the power supply channel loses power, the memory metal piece 1 changes from a contracted state to an expanded state, the reset spring 25 drives the driving plectrum 21 to move towards the starting point, and the non-return plectrum 24 prevents the ratchet teeth 221 from rotating after sliding into the teeth of the next stage of the ratchet teeth 221; the stroke contact sensor 26 up to the start point is turned on with the driving paddle 21, and the power supply path is energized again and the above-described process is repeated.

Referring to fig. 6, fig. 6 is a schematic structural diagram of a power supply path according to an embodiment of the present application.

In a specific embodiment, the memory metal part 1, the driving pulling piece 21 and the reset spring 25 are all made of conductive materials, and the reset spring 25, the driving pulling piece 21 and the memory metal part 1 are sequentially connected to form a power supply path.

In the present embodiment, the memory metal part 1 has a memory effect and an electric conductivity, and the return spring 25 also has an electric conductivity, and the present embodiment innovatively applies the return spring 25 to the power supply, thereby initiating the movement of the mechanism.

In some embodiments, the infusion mechanism 2 further comprises a first power contact blade 27 and a second power contact blade 28, the first power contact blade 27 being connected to the return spring 25 and the second power contact blade 28 being connected to the memory metal piece 1.

In this embodiment, the first power supply contact metal sheet 27 and the second power supply contact metal sheet 28 are respectively connected with power supply points on the circuit board, and form power supply path paths connected with the power supply points of the circuit board as follows: a first power supply contact metal sheet 27, a return spring 25, a driving paddle 21, a memory metal piece 1, a second power supply contact metal sheet 28.

Referring to fig. 7 and fig. 8, fig. 7 is a schematic structural diagram of a base provided in an embodiment of the present application, and fig. 8 is a schematic structural diagram of the base with the bottom upward in fig. 7.

In some embodiments, the infusion drive device further comprises a base 3, the base 3 is provided with a memory metal part 1, a power supply path and an infusion mechanism 2, and the memory metal part 1 and the power supply path are positioned on the back side of the base 3.

In the present embodiment, the base 3 serves as a base for all the components, and its functions include not only fitting of the components, but also consideration of friction force and influence on stability and reliability of the overall structure.

In some embodiments, the memory metal part 1 is in a wire shape, the sliding wheel 31 is arranged on the back side of the base 3, the memory metal part 1 is wound on the sliding wheel 31 and is tensioned, and the trend of the memory metal part 1 can be changed through the sliding wheel 31.

Alternatively, the memory metal material used for the memory metal part 1 is nickel-titanium alloy, and the nickel-titanium alloy has the characteristics of shape memory and super elasticity, and can realize the transformation of the shape memory by generating heat through electrifying.

The application also provides an insulin pump, including above-mentioned infusion drive arrangement, insulin pump still includes medicine storage storehouse 4, and medicine storage storehouse 4 is provided with pushes away medicine mouth and play medicine mouth 41, pushes away the medicine mouth and is used for cooperating with infusion mechanism 2, pushes out medicine mouth 41 with the inside liquid medicine in medicine storage storehouse 4 through infusion mechanism 2.

Referring to fig. 9 to 11, fig. 9 is a schematic structural diagram of a piston provided in an embodiment of the present application, fig. 10 is a schematic structural diagram of a drug storage bin provided in an embodiment of the present application, and fig. 11 is a schematic structural diagram of a piston and a drug storage bin combined according to an embodiment of the present application.

As shown in fig. 7 and 10, the base 3 is provided with a mounting groove 33, the medicine storage bin 4 is provided with a mounting protrusion 42, and the positioning and mounting of the medicine storage bin 4 on the base 3 are realized by the positioning and matching of the mounting protrusion 42 and the mounting groove 33. As shown in fig. 9 and 11, the piston 23 is provided with a sealing ring 232, and the sealing ring 232 is used for sealing the medicine storage bin 4, so as to realize reliable sealing in the process of storing and infusing insulin medicine liquid.

In one embodiment, please continue to refer to fig. 1 to 11, the following is described using a memory wire as the memory metal part 1.

The driving plectrum 21 is arranged on the base 3 and is made of conductive materials; one side of the driving plectrum 21 is provided with a side arm, the thickness of the side arm is thinner than that of the main body of the driving plectrum 21, and the side arm has certain elasticity and is propped against the ratchet teeth 221; the other side of the driving pulling piece 21 is provided with a contact structure matched with a stroke contact sensor 26; the front end of the driving poking piece 21 is of a flat structure; the rear end of the driving plectrum 21 is provided with a doubling structure for being matched with the assembly of the memory metal wire; a strip-shaped hole is formed in the middle of the driving poking piece 21 and is used for being assembled by matching with the reset spring 25.

The memory metal wire is made of nickel-titanium alloy, has a memory effect and conductivity, and the tail end of the driving poking piece 21 tightly clamps one end of the nickel-titanium alloy memory metal wire by doubling back, and is connected rigidly by spot welding to form conduction (the nickel-titanium alloy and copper-iron materials cannot be welded conventionally); the other end of the memory wire is clamped in the same manner by the bent structure of the second power contact metal sheet 28 and is connected rigidly by spot welding to form a conductive path. The memory wire changes the wiring direction by means of two pulleys 31, in the unpowered state being in the expanded state of the memory wire, the memory wire length in this state being just fixed on the base 3.

The second power supply contact metal sheet 28 is made of conductive material; the second power supply contact metal sheet 28 is positioned on the side of the memory metal wire, a hole is arranged in the middle of the second power supply contact metal sheet, and the second power supply contact metal sheet 28 is fixed on the base 3 through the hole; the second power supply contact metal sheet 28 has a wall structure bent into a contact shape on one side, is pressed against a power supply point on the circuit board, has a folded structure on the other side, and is used for pressing the memory metal wire and forming rigid connection and conduction through spot welding.

The reset spring 25 is made of metal conductive materials, has elasticity, is fixed on one mounting column on the other surface of the base 3 opposite to the mounting surface of the driving plectrum 21, and has elastic potential energy, wherein the reset spring 25 is in a pre-compression state; the return spring 25 has two ends, and the short end is pressed against the first power supply contact metal sheet 27 and conducted due to the initial force of the compression of the return spring 25; the long other end passes through the holes of the base 3 and the driving poking piece 21 and then hooks the driving poking piece 21, and the driving poking piece 21 is pressed by the reset spring 25 to have initial force so as to push the driving poking piece 21 to be conducted, and the driving poking piece 21 is pushed by the reset spring 25 on the limit rib of the base 3.

The first power supply contact metal sheet 27 is made of conductive material; the first power supply contact metal sheet 27 is positioned on the side of the reset spring 25, a hole is formed in the middle of the first power supply contact metal sheet, and the first power supply contact metal sheet 27 is fixed on the base 3 through the hole; the first power supply contact metal sheet 27 has a wall structure bent into a contact shape on one side, is pressed against a power supply point on the circuit board, and extends to a short end of the return spring 25 through the base 3 on the other side to form conduction with the return spring 25.

The stroke contact sensor 26 is a spring thimble made of conductive materials, one end of the spring thimble is fixed on the base 3, and the other end of the spring thimble is pressed at the contact position of the circuit board; the side wall of the travel contact sensor 26 is in contact with the driving poking piece 21 to form conduction; the number of the stroke contact sensors 26 is two, and the two stroke contact sensors 26 respectively correspond to the start point and the end point of the reciprocating motion of the driving dial 21.

The base 3 is made of plastic, is a foundation for installing all parts, has small surface friction force, and one surface of the base 3 is provided with rib positions and hole positions matched with the installation of the parts, so that the reliable installation and stress of the parts can be ensured; the base 3 is provided with guide rails and ribs for reducing friction force around and below the installation position of the driving shifting sheet 21.

Description of the movement of the driving blade 21: the first power supply contact metal sheet 27+ the return spring 25+ the driving paddle 21+ the memory wire + the second power supply contact metal sheet 28 form a power supply path. In the initial state, the power supply passage is not electrified, the memory metal wire is in a stretched state, the driving plectrum 21 is propped against the starting point limiting rib of the reciprocating stroke of the base 3 by the reset spring 25, and the plectrum is contacted with the starting point contact sensor; when the passage is electrified, the memory effect of the memory metal wire is triggered by heat generated by the resistor, the memory effect is changed from a stretching state to a shrinking state, the driving plectrum 21 is pulled to slide in a track defined by the base 3 to reach the end limiting rib of the reciprocating stroke, the driving plectrum 21 is contacted with the end contact sensor, the reset spring 25 is pulled by the driving plectrum 21 to increase the deformation elasticity, and the side arm of the driving plectrum 21 is embedded into the ratchet teeth 221 to form engagement, so that the ratchet teeth 221 are driven to rotate in a stepping way; the power supply path is then de-energized, the memory wire is changed from a contracted state to an expanded state by temperature cooling, the driving plectrum 21 is restored to an initial state under the action of the return spring 25 to reach a starting point position of the reciprocating motion, and the side arm of the driving plectrum 21 slides to the next stage ratchet teeth 221 out of engagement with the ratchet teeth 221.

The middle section of the outer wall of the transmission member 22 is provided with a convex structure similar to a flange-shaped surface, ratchet teeth 221 are distributed on the periphery of the structure, and the ratchet teeth 221 are in propping contact with the driving shifting sheet 21 and the non-return shifting sheet 24 to form a transmission structure; the end face of the transmission piece 22 is provided with two step faces which are used for playing an axial limiting role when the transmission piece 22 is installed in the installation groove of the base 3; the inner wall of the driving member 22 is provided with an internal thread for engagement with the thread on the threaded rod 231.

The plastic base 3 is provided with a mounting groove for placing the transmission piece 22, and in order to reduce friction, two groups of three-direction point connection contact structures are arranged at the rotating positions of the base 3 and the transmission piece 22; the base 3 is provided with two mounting slots of the fixing rods 32, the fixing rods 32 are fixed by placing the fixing rods 32 into the slots to enable the plastics to generate stress deformation, the threaded rods 231 are limited by two groups of eight contact points through two groups of three-point connection structures of the two groups of fixing rods 32, and meanwhile, the threaded rods 231 also form axial limiting with the grooved inner wall of the base 3 through two step surfaces of the transmission piece 22.

The non-return pulling piece 24 is made of metal, has elasticity, is provided with a non-return end in the middle, is provided with fixing arms on two sides, and is provided with holes in the fixing arms for fixing on the base 3.

Motion description of the transmission 22: initially, the memory wire is not energized, the non-return end of the non-return paddle 24 is embedded in the ratchet teeth 221 to avoid the ratchet teeth 221 from rotating, and the side arm of the driving paddle 21 and the ratchet teeth 221 do not form a pressing engagement; after the memory metal wire is electrified, the side arm of the driving shifting piece 21 is propped against the embedded ratchet teeth 221 to form engagement, the ratchet teeth 221 are driven to rotate in a stepping way, the non-return end of the non-return shifting piece 24 is in failure of the current engagement of the ratchet teeth 221, and the non-return end slides into the next stage of ratchet teeth 221; after the memory metal wire is powered off, the side arm of the driving shifting piece 21 is separated from the jacking engagement with the ratchet teeth 221 under the action of the reset spring 25 and slides to the next-stage ratchet, and at the moment, the non-return shifting piece 24 is in jacking engagement with the ratchet teeth 221 so as to prevent the transmission piece 22 from rotating due to friction force in the stroke of driving the side arm of the shifting piece 21 to retract.

The base 3 is provided with a fence-shaped installation area for installing the medicine storage bin 4, one end of the fence area is provided with an installation groove position for being embedded with a protruding structure at one end of the medicine storage bin 4, and the other side of the fence area is provided with an installation groove 33 for being embedded with an installation protrusion 42 at the other end of the medicine storage bin 4.

The medicine storage bin 4 is made of plastic material and is arranged on the base 3, one end of the medicine storage bin 4 is provided with two cylindrical installation protrusions 42 which are used for being embedded into the installation grooves 33 of the base 3, and the end is also provided with a medicine outlet 41 which can be connected with other modules (such as an implantation needle and the like) through pipelines; the other end of the medicine storage bin 4 is of an open structure, can be matched with the piston 23 as a medicine pushing port, is tightly attached to the piston 23 through a sealing ring 232 on the piston 23, and is formed by a medicine storage bin 4, the sealing ring 232 and the piston 23, wherein a space surrounded by the medicine storage bin 4, the sealing ring 232 and the piston 23 is a medicine liquid storage area, the edge of the other end of the medicine storage bin is provided with a protruding structure for being embedded into the base 3, and the medicine storage bin 4 can be tightly installed in the installation area of the medicine storage bin 4 surrounded by the base 3 by being matched with the two installation protrusions 42 without relative displacement.

The piston 23 is made of plastic, and the front end of the piston 23 is a sealing surface matched with the shape of the medicine storage bin 4; the rear end of the piston 23 is integrated with the threaded rod 231 through an insert injection molding process; the middle section of the piston 23 is provided with a groove surrounding the piston 23 for nesting the sealing ring 232, and the piston 23 can slide back and forth in the medicine storage bin 4 in cooperation with the sealing ring 232.

The threaded rod 231 is made of metal, is integrally in a strip-shaped cylindrical shape, threads matched with threads on the inner wall of the transmission member 22 are formed on the surface of the threaded rod 231, the threaded rod 231 is coaxially matched with the transmission member 22, the threaded rod 231 is meshed with the transmission member 22 through threads, one end of the threaded rod 231 is combined with the piston 23 into a whole, and in an initial state, the rest part of the threaded rod 231 is completely surrounded by the transmission member 22.

Piston 23 push-out motion description: in the initial state, the piston 23 and the sealing ring 232 are arranged at the maximum line of the medicine storage bin 4, the medicine liquid is filled in the medicine storage bin 4, and the exposed part of the threaded rod 231 is completely surrounded by the transmission piece 22; the medicine storage bin 4 and the base 3 are firmly arranged without relative displacement, the piston 23 cannot rotate in the medicine storage bin 4 because the shape of the piston is the same as that of the inner wall of the medicine storage bin 4, and further, the threaded rod 231 connected to the piston 23 cannot rotate; along with the rotation of the transmission member 22, the threaded rod 231 which cannot rotate in the transmission member 22 and the transmission member 22 generate axial displacement due to the action of threads, and the transmission member 22 cannot move along the axial direction of the transmission member 22 due to the abutment of the step surface of the joint of the ratchet structure and the transmission member 22 and the inner wall of the base 3, so that the threaded rod 231 pushes the piston 23 to move from the maximum line to the zero line along the axial direction of the threaded rod 231 in the medicine storage bin 4, and the medicine liquid in the medicine storage bin 4 is enabled to be reserved from the medicine outlet 41 to enter other modules of the pump body and then enter the patient under the action of hydraulic pressure.

In summary, compared with the traditional insulin pump using a micro motor as a driving mode, the insulin pump and the infusion driving device thereof have a series of advantages by adopting the structures such as memory alloy and the like:

cost effectiveness: the application adopts memory alloy such as nickel-titanium alloy and the like as a driving material, and compared with a miniature motor, the material has lower cost. The mechanical structure is relatively simple and the manufacturing cost is more economical.

The reliability is high: because the memory alloy is adopted, the material has better reliability and stability, and is not easy to fail. In contrast, micro motors present risks of circuit failure, control stability, etc.

And (3) accurate control: the design of the mechanical structure allows more accurate control of the pushing amount and frequency of the medicine, thereby better meeting the personalized treatment requirements of patients. The mechanical structure is easier to adjust and optimize with respect to the digital control of the micro-machine.

And (3) light weight design: the device avoids the use of components such as a traditional motor, a reducer gear set and the like, is lighter and more convenient, and is suitable for patients to carry and use.

Reducing electromagnetic radiation: the lower radiation level, due to the absence of the micro-motor, helps to reduce the radiation exposure risk for the patient.

It should be noted that many of the components mentioned in this application are common standard components or components known to those skilled in the art, and the structure and principle thereof can be known by those skilled in the art through technical manuals or through routine experimental methods.

It should be noted that in this specification relational terms such as first and second are used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities.

The insulin pump and the infusion driving device provided by the present application are described in detail above. Specific examples are set forth herein to illustrate the principles and embodiments of the present application, and the description of the examples above is only intended to assist in understanding the methods of the present application and their core ideas. It should be noted that it would be obvious to those skilled in the art that various improvements and modifications can be made to the present application without departing from the principles of the present application, and such improvements and modifications fall within the scope of the claims of the present application.

Claims (10)

1. The infusion driving device is characterized by comprising a memory metal piece, a power supply passage and an infusion mechanism, wherein the memory metal piece is communicated with the power supply passage and is used for deforming to output power when the power supply passage is electrified, a power output end of the memory metal piece is connected with a power input end of the infusion mechanism, and the infusion mechanism is used for realizing the infusion of medicines under the driving of the memory metal piece.

2. The infusion drive unit of claim 1, wherein the infusion mechanism comprises a drive paddle, a transmission member, and a piston, the drive paddle being coupled to the memory metal member, the drive paddle being configured to operate upon actuation of the memory metal member, the piston being in driving communication with the drive paddle via the transmission member, the piston being configured to effect infusion of a drug.

3. The infusion drive unit according to claim 2, wherein the outer circumference of the transmission member is provided with ratchet teeth for engagement with the drive paddle, the ratchet teeth for stepwise movement under the action of the drive paddle, and the inner circumference of the transmission member is provided with a threaded surface for engagement with the threaded rod of the piston, the threaded surface for driving the piston to move upon rotation of the transmission member.

4. The infusion drive unit of claim 3, wherein the infusion mechanism further comprises a non-return paddle and a return spring, the non-return paddle cooperating with the ratchet teeth, the non-return paddle being adapted to limit rotation of the ratchet teeth, the return spring being coupled to the drive paddle, the return spring being adapted to drive the drive paddle back to an initial position for driving the ratchet teeth when the power path is de-energized to effect reciprocation of the drive paddle under the influence of the power path and the return spring.

5. The infusion drive unit of claim 4, wherein the infusion mechanism further comprises two travel contact sensors disposed at a start point and an end point of the reciprocating motion of the drive paddle, respectively.

6. The infusion drive unit of claim 4, wherein the memory metal piece, the drive paddle and the return spring are all of a conductive material, and the return spring, the drive paddle and the memory metal piece are sequentially connected to form the power supply path.

7. The infusion drive unit of claim 6, wherein the infusion mechanism further comprises a first power contact blade and a second power contact blade, the first power contact blade being connected to the return spring and the second power contact blade being connected to the memory metal piece.

8. The infusion drive unit of any one of claims 1 to 7, further comprising a base on which the memory metal piece, the power supply path and the infusion mechanism are mounted, the memory metal piece and the power supply path being located on a back side of the base.

9. The infusion drive unit according to claim 8, wherein the memory metal element is in the form of a wire, a pulley is provided on the back side of the base, and the memory metal element is wound around the pulley and is tensioned.

10. An insulin pump comprising the infusion driving device according to any one of claims 1 to 9, further comprising a drug storage bin provided with a drug pushing port and a drug outlet, the drug pushing port being adapted to cooperate with the infusion mechanism, and pushing the drug liquid inside the drug storage bin out of the drug outlet through the infusion mechanism.