Insulin pump and infusion driving device thereof

Abstract

The utility model discloses an infusion driving device, and relates to the technical field of medical instruments. The infusion driving device comprises a memory metal part, a power supply access and an infusion mechanism, the memory metal part is communicated with the power supply access and used for deforming to output power when the power supply access is powered on, the power output end of the memory metal part is connected with the power input end of the infusion mechanism, and the power output end of the infusion mechanism is connected with the power output end of the memory metal part. The infusion mechanism is used for achieving infusion of medicine under driving of the memory metal piece. According to the infusion driving device, the insulin pump can achieve more portable and more accurate medicine infusion in an application type product.

Description

Technical Field

[0001] The present application relates to the technical field of medical devices, and in particular to an infusion drive device and an insulin pump. Background Art

[0002] An insulin pump is a medical device used to simulate the secretory function of the pancreas and can infuse insulin into the patient's body according to the dosage required by the human body.

[0003] An insulin pump is usually composed of an infusion drive device, a piston and a storage device. The infusion drive device pushes the piston, and the piston infuses the drug in the storage device to the target location. At present, the author of the utility model has found that the patch-type insulin pump product has the problem of being small in size and difficult to integrate with a motor-type drive device. The infusion drive device using a traditional motor structure can no longer meet the high-precision drug infusion requirements of the patch-type insulin pump product. Hereby, improvements are proposed for the insulin pump and its infusion drive device. Utility Model Content

[0004] The purpose of the present application is to provide an infusion drive device, so that an insulin pump can achieve more portable and more accurate drug infusion in a patch-type product. Another purpose of the present application is to provide an insulin pump including an infusion drive device.

[0005] To achieve the above-mentioned purpose, the present application provides an infusion drive device, which includes a memory metal part, a power supply path and an infusion mechanism, wherein the memory metal part is connected to the power supply path, and the memory metal part is used to deform to output power when the power supply path is energized, and the power output end of the memory metal part is connected to the power input end of the infusion mechanism, and the infusion mechanism is used to realize the infusion of drugs under the drive of the memory metal part.

[0006] In some embodiments, the infusion mechanism includes a drive paddle, a transmission member and a piston, wherein the drive paddle is connected to the memory metal member, the drive paddle is used to move under the drive of the memory metal member, the piston is connected to the drive paddle through the transmission member, and the piston is used to realize the infusion of the drug.

[0007] In some embodiments, ratchet teeth are provided on the outer periphery of the transmission member, and the ratchet teeth cooperate with the drive paddle. The ratchet teeth are used to move in steps under the action of the drive paddle. A threaded surface is provided on the inner periphery of the transmission member, and the threaded surface cooperates with the threaded rod of the piston. The threaded surface is used to drive the piston to move when the transmission member rotates.

[0008] In some embodiments, the infusion mechanism further includes a check paddle and a reset spring, wherein the check paddle cooperates with the ratchet teeth, the check paddle is used to limit the rotation of the ratchet teeth, the reset spring is connected to the drive paddle, and the reset spring is used to drive the drive paddle to return to the initial position of driving the ratchet teeth when the power supply path is powered off, so as to realize the reciprocating motion of the drive paddle under the action of the power supply path and the reset spring.

[0009] In some embodiments, the infusion mechanism further includes a travel contact sensor, and the number of the travel contact sensors is two and the sensors are respectively arranged at the starting point and the end point of the reciprocating motion of the driving paddle.

[0010] In some embodiments, the memory metal piece, the driving paddle and the return spring are all made of conductive materials, and the return spring, the driving paddle and the memory metal piece are sequentially connected to form the power supply path.

[0011] In some embodiments, the infusion mechanism further comprises a first power supply contact metal sheet and a second power supply contact metal sheet, wherein the first power supply contact metal sheet is connected to the return spring, and the second power supply contact metal sheet is connected to the memory metal piece.

[0012] 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, and the memory metal piece and the power supply path are located on the back side of the base.

[0013] In some embodiments, the memory metal piece is in a wire shape, a sliding wheel is provided on the back side of the base, and the memory metal piece is wound around the sliding wheel to achieve tension.

[0014] The present application also provides an insulin pump, comprising the above-mentioned infusion drive device, the insulin pump also comprising a drug storage bin, the drug storage bin being provided with a drug push port and a drug outlet port, the drug push port being used to cooperate with the infusion mechanism to push the drug liquid inside the drug storage bin out of the drug outlet port through the infusion mechanism.

[0015] Compared with the above-mentioned background technology, the infusion drive device provided in the present application includes a memory metal part, a power supply path and an infusion mechanism. The memory metal part is connected to the power supply path. The memory metal part is used to deform to output power when the power supply path is energized. The power output end of the memory metal part is connected to the power input end of the infusion mechanism. The infusion mechanism is used to realize the infusion of drugs under the drive of the memory metal part.

[0016] The infusion drive device can be assembled with the drug storage bin to form a complete insulin pump product. When in use, the power supply path is powered on and off, and the memory metal part is used to restore the memory shape when heated, thereby realizing drug infusion. Specifically, in the initial state, no voltage is applied to the power supply path, the memory metal part is in an extended state, the power output end of the memory metal part is at the initial position, and the memory metal part does not input power to the infusion mechanism; when the power supply path is powered on, the memory metal part generates heat under the external conditions of the circuit conduction and the resistance conditions it has, triggering the memory effect of the memory metal, the memory metal part changes from an extended state to a contracted state, the power output end of the memory metal part starts to move from the initial position, and the memory metal part inputs power to the infusion mechanism, so that the infusion mechanism can realize drug infusion under the drive of the memory metal part; as an option, the power supply path is subsequently powered off, and the memory metal part changes from a contracted state to an extended state under the condition of lowered temperature, which can prepare for the next drug infusion.

[0017] In combination with the above structure and process description, it can be seen that the infusion drive device has at least the following beneficial effects: the infusion drive device uses memory metal parts as the driving structure, and through the use of innovative mechanical structure design, the size of the insulin pump can be greatly reduced, making it more compact and lightweight; the infusion drive device utilizes reliable materials such as memory alloys, and through the simplification of the mechanical structure, the stability and reliability of the insulin pump can be improved, thereby enhancing its practicality in medical applications; based on this, the infusion drive device enables the insulin pump to achieve more portable and more accurate drug infusion in patch-type products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 A schematic diagram of the structure of an insulin pump provided in an embodiment of the present application;

[0020] Figure 2 for Figure 1 The schematic diagram of the structure of the insulin pump with the bottom facing upwards;

[0021] Figure 3 A schematic diagram of the structure of an infusion drive device provided in an embodiment of the present application;

[0022] Figure 4 A schematic diagram of the structure of the infusion drive device provided in an embodiment of the present application after the base is removed;

[0023] Figure 5 for Figure 4 A schematic diagram of the structure of the infusion drive device with the bottom facing upward;

[0024] Figure 6 A schematic diagram of the structure of the power supply path provided in the embodiment of the present application;

[0025] Figure 7 A schematic diagram of the structure of a base provided in an embodiment of the present application;

[0026] Figure 8 for Figure 7 A schematic diagram of the structure with the bottom of the middle base facing upwards;

[0027] Fig. 9 A schematic diagram of the structure of a piston provided in an embodiment of the present application;

[0028] Fig.10 A schematic diagram of the structure of the medicine storage bin provided in the embodiment of the present application;

[0029] Fig.11 A schematic diagram of the structure of the piston and medicine storage chamber after being combined according to an embodiment of the present application.

[0030] in:

[0031] 1. Memory metal part; 2. Infusion mechanism; 21. Drive paddle; 22. Transmission part; 221. Ratchet teeth; 23. Piston; 231. Threaded rod; 232. Sealing ring; 24. Check paddle; 25. Reset spring; 26. Travel contact sensor; 27. First power supply contact metal sheet; 28. Second power supply contact metal sheet; 3. Base; 31. Sliding wheel; 32. Fixing rod; 33. Installation groove; 4. Medicine storage chamber; 41. Medicine outlet; 42. Installation protrusion. DETAILED DESCRIPTION

[0032] The present application relates to the field of medical device technology, with a specific focus on the field of insulin infusion pumps (insulin infusion pumps have the same meaning as insulin pumps), and in particular, on the innovative design of miniaturized and efficient drive mechanisms for patch-type insulin pump products.

[0033] In the treatment of diabetic patients, the insulin pump is a key medical device used to simulate the insulin secretion function of the pancreas. Existing insulin pumps mainly adopt a split design, and the background of this application focuses on a patch-type insulin pump, which aims to solve the problem of large size and non-portability of traditional products. Among them, it involves the monitoring of the drug delivery drive transmission state, the accuracy and stability of drug infusion, and the design of a miniaturized drive mechanism.

[0034] Although existing insulin pump products have made significant progress in the field of drug infusion, they also have some shortcomings, which can be improved by the innovative solutions provided by this application. The following are some shortcomings of the prior art:

[0035] Electromagnetic radiation: The use of electric pumps may involve electric motors, which may cause problems with electromagnetic radiation and cause concerns for patients. This application uses memory alloys and mechanical structures, which may reduce the radiation level and improve the safety of use.

[0036] High cost: Traditional electric pumps usually contain multiple complex components such as motors and reduction gear sets, and the manufacturing and maintenance costs are relatively high. The relatively low-cost materials such as memory alloys and simplified mechanical structures used in this application are expected to reduce the overall cost of the product.

[0037] Size and weight: Electric pumps may be relatively large and heavy due to the need for a motor and a reduction gear set, making them less suitable for patients to carry. The mechanical structure and lightweight design of the present application may help reduce the size and weight of the device.

[0038] Accuracy limitation: Electric pumps have some limitations in the accuracy of drug delivery, especially when low flow and small dose infusion may be difficult to accurately control. This application adopts a stepper mechanical structure, which may make it easier to achieve accurate control of drug delivery.

[0039] Difficult maintenance: The motor and electronic components inside the electric pump make maintenance relatively difficult, and users often need professional technical support. This application adopts a simplified mechanical structure, which may reduce the difficulty of equipment maintenance.

[0040] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0041] Please refer to Figures 1 to 3 ,in, Figure 1 This is a schematic diagram of the structure of the insulin pump provided in the embodiment of the present application. Figure 2 for Figure 1 Schematic diagram of the structure of the insulin pump with the bottom facing up. Figure 3 A schematic diagram of the structure of the infusion drive device provided in an embodiment of the present application.

[0042] In a specific embodiment, the infusion drive device provided in the embodiment of the present application includes a memory metal piece 1, a power supply path and an infusion mechanism 2. The memory metal piece 1 is connected to the power supply path. The memory metal piece 1 is used to deform to output power when the power supply path is energized. The power output end of the memory metal piece 1 is connected to the power input end of the infusion mechanism 2. The infusion mechanism 2 is used to realize the infusion of drugs under the drive of the memory metal piece 1.

[0043] It should be noted that the memory metal part 1 in this embodiment is made of memory metal material, and memory metal is a metal alloy that can produce a shape memory effect by being heated. The shape memory effect refers to the property that a material can return to its original shape through external stimulation (such as temperature change) after undergoing a shape change. The stretched state and the contracted state refer to two states of the memory alloy, corresponding to different shapes of the alloy. Based on this, in this embodiment, the memory metal part 1 generates heat by energizing the power supply path, and the memory metal part 1 realizes the transition between the stretched state and the contracted state through the shape memory effect, and then inputs the driving power to the infusion mechanism 2, which is used to drive the insulin infusion pump to achieve the infusion of the drug.

[0044] The infusion drive device can be assembled with the drug storage bin 4 to form a complete insulin pump product. When in use, the power supply path is powered on and off, and the memory metal piece 1 is used to restore the memory shape when heated, thereby realizing drug infusion. Specifically, in the initial state, no voltage is applied to the power supply path, the memory metal piece 1 is in a stretched state, the power output end of the memory metal piece 1 is at the initial position, and the memory metal piece 1 does not input power to the infusion mechanism 2; when the power supply path is powered on, the memory metal piece 1 generates heat under the external conditions of the circuit conduction and the resistance conditions it has, triggering the memory effect of the memory metal, the memory metal piece 1 changes from the stretched state to the contracted state, the power output end of the memory metal piece 1 starts to move from the initial position, and the memory metal piece 1 inputs power to the infusion mechanism 2, so that the infusion mechanism 2 can realize the infusion of the drug under the drive of the memory metal piece 1; as an option, the power supply path is subsequently powered off, and the memory metal piece 1 changes from the contracted state to the stretched state under the condition of lowered temperature, which can prepare for the next drug infusion.

[0045] In combination with the above structure and process description, it can be seen that the infusion drive device has at least the following beneficial effects: the infusion drive device adopts a memory metal part 1 as a driving structure, and by adopting an innovative mechanical structure design, the size of the insulin pump can be greatly reduced, making it more compact and lightweight; the infusion drive device utilizes reliable materials such as memory alloys, and by simplifying the mechanical structure, the stability and reliability of the insulin pump can be improved, thereby enhancing its practicality in medical applications.

[0046] In summary, the present application aims to solve the problem of small size and difficulty in integrating motor-type drive devices in patch-type insulin pump products. Due to the limited volume, traditional patch-type insulin pumps are difficult to accommodate large drive devices, which affects the miniaturization and portability of the product. In response to this problem, the present application innovatively adopts the unique properties of memory metals, generates heat by passing electric current, and realizes the shape memory transformation of memory metals. This small and efficient drive mechanism design enables insulin infusion pumps to achieve more portable and accurate drug infusion in patch-type products. Through this innovative solution, the present application aims to improve the portability and use effect of insulin infusion products.

[0047] It should be noted that, except for the description of the improvements made to the insulin pump and its infusion drive device in this embodiment, for the undescribed contents, reference can be made to the prior art and will not be repeated here.

[0048] Please combine Figures 1 to 3 And refer to Figure 4 and Figure 5 , Figure 4 This is a schematic diagram of the structure of the infusion drive device provided in an embodiment of the present application after the base is removed. Figure 5 for Figure 4 Schematic diagram of the structure of the infusion drive device with the bottom facing upward.

[0049] In some embodiments, the infusion mechanism 2 includes a driving paddle 21, a transmission member 22 and a piston 23. The driving paddle 21 is connected to the memory metal member 1. The driving paddle 21 is used to move under the drive of the memory metal member 1. The piston 23 is connected to the driving paddle 21 through the transmission member 22. The piston 23 is used to realize the infusion of the drug.

[0050] In this embodiment, the driving paddle 21 is equivalent to the power input end of the infusion mechanism 2. Through the connection between the driving paddle 21 and the memory metal part 1, the driving paddle 21 is driven by the memory metal part 1 to move; the transmission part 22 serves as a force transmission structure between the driving paddle 21 and the piston 23, which transmits the movement of the memory metal part 1 to the piston 23, so that the piston 23 is finally driven by the memory metal part 1 to move, thereby realizing the infusion of the drug.

[0051] It should be noted that when the infusion drive device and the drug storage chamber 4 are assembled to form a complete insulin pump product, a stable sealing relationship should be formed between the piston 23 and the drug storage chamber 4, and then when the piston 23 moves relative to the drug storage chamber 4, the piston 23 pushes and transports the drug in the drug storage chamber 4.

[0052] Optionally, the outer periphery of the transmission member 22 is provided with ratchet teeth 221, which cooperate with the driving paddle 21, and the ratchet teeth 221 are used to step movement under the action of the driving paddle 21. The inner periphery of the transmission member 22 is provided with a threaded surface, which cooperates with the threaded rod 231 of the piston 23, and the threaded surface is used to drive the piston 23 to move when the transmission member 22 rotates.

[0053] In this embodiment, the ratchet teeth 221 and the threaded surface can be regarded as two structural forms on the transmission member 22, and the relationship between the transmission member 22 and the threaded rod 231 is similar to that between a nut and a screw. The ratchet teeth 221 are used to perform step rotation at a fixed step angle under the action of the driving paddle 21, and the threaded surface is used to convert the rotation of the ratchet teeth 221 into the movement of the piston 23, so that the piston 23 moves accurately according to the step distance corresponding to the step angle.

[0054] It should be noted that this embodiment only provides an optional method of the infusion mechanism 2, and does not mean that this embodiment is the only implementation method of the infusion mechanism 2. Therefore, other optional methods of the infusion mechanism 2 should also fall within the scope of description of this application.

[0055] In a specific embodiment, continuing to take the example that the infusion mechanism 2 includes a driving paddle 21, a transmission member 22 and a piston 23, further, the infusion mechanism 2 also includes a check paddle 24 and a reset spring 25, the check paddle 24 cooperates with the ratchet teeth 221, the check paddle 24 is used to limit the rotation of the ratchet teeth 221, the reset spring 25 is connected to the driving paddle 21, and the reset spring 25 is used to drive the driving paddle 21 to return to the initial position of the driving ratchet teeth 221 when the power supply path is cut off, so as to realize the reciprocating motion of the driving paddle 21 under the action of the power supply path and the reset spring 25.

[0056] In this embodiment, the movement principle of the infusion drive device is mainly divided into three parts, including the memory metal part 1 and the return spring 25 causing the driving paddle 21 to reciprocate, the driving paddle 21 and the check paddle 24 causing the transmission member 22 to rotate, and the transmission member 22 driving the piston 23 to push out along the axial direction.

[0057] Taking the reciprocating motion of the driving paddle 21 as an example, when in use, the power supply path is energized, the memory metal piece 1 generates heat due to the resistance, triggering the memory effect of the memory metal piece 1, the memory metal piece 1 changes from the stretched state to the contracted state, the memory metal piece 1 pulls the driving paddle 21 to move from the starting point to the end point, the reset spring 25 is pulled and deformed by the driving paddle 21, and the elastic force increases, the driving paddle 21 is embedded in the ratchet teeth 221 to form an engagement, and the driving paddle 21 drives the ratchet teeth 221 to rotate, so as to realize the step rotation of the ratchet teeth 221; then the power supply path loses power, the memory metal piece 1 changes from the contracted state to the stretched state after the temperature cools down, the driving paddle 21 moves from the end point to the starting point under the action of the reset spring 25, the driving paddle 21 disengages from the engagement with the ratchet teeth 221 and slides to the next level of teeth of the ratchet teeth 221, so that when the driving paddle 21 moves from the starting point to the end point again, the driving paddle 21 is embedded in the next level of teeth of the ratchet teeth 221, so as to realize the next step rotation of the ratchet teeth 221.

[0058] Taking the rotational movement of the transmission member 22 as an example, in the initial state, the power supply path is not energized, and the non-return paddle 24 is embedded in the ratchet teeth 221 to prevent the ratchet teeth 221 from rotating, and the driving paddle 21 does not form a top-pressure meshing with the ratchet teeth 221; after the power supply path is energized, the driving paddle 21 is pressed and embedded in the ratchet teeth 221 to form an engagement, driving the ratchet teeth 221 to rotate to form the ratchet teeth 221 stepping, and the current engagement between the non-return paddle 24 and the ratchet teeth 221 fails, and the non-return paddle 24 slides into the next level of teeth of the ratchet teeth 221; after the power supply path is de-energized, the driving paddle 21 is disengaged from the top-pressure meshing with the ratchet teeth 221 under the action of the reset spring 25 and slides to the next level of teeth of the ratchet teeth 221. At this time, the non-return paddle 24 is in top-pressure meshing with the ratchet teeth 221 to prevent the transmission member 22 from rotating due to friction during the stroke in which the driving paddle 21 disengages from the ratchet teeth 221.

[0059] Taking the axial pushing movement of the piston 23 as an example, as the transmission member 22 rotates, the threaded rod 231 produces axial displacement due to the action of the thread, so that the piston 23 moves axially along the threaded rod 231 in the drug storage chamber 4, and the piston 23 pushes the drug in the drug storage chamber 4 to achieve infusion.

[0060] In some embodiments, the infusion mechanism 2 further includes a travel contact sensor 26 , and the number of the travel contact sensors 26 is two and they are respectively arranged at the starting point and the end point of the reciprocating motion of the driving paddle 21 .

[0061] In this embodiment, the movement position of the driving paddle 21 can be monitored by connecting the two travel contact sensors 26 to the driving paddle 21, thereby realizing the control of the reciprocating motion of the driving paddle 21. For example, in the initial state, the power supply path is not energized, the travel contact sensor 26 at the starting point is connected to the driving paddle 21, at this time the memory metal part 1 is in an extended state, the driving paddle 21 is not engaged with the ratchet teeth 221, the ratchet teeth 221 are prevented from rotating under the restriction of the check paddle 24, and the transmission part 22 and the piston 23 are immobile; the power supply path is energized, at this time the two travel contact sensors 26 are not connected to the driving paddle 21, the memory metal part 1 changes from the extended state to the contracted state, and the memory metal part 1 pulls the driving paddle 21 to move toward the end point; until the travel contact sensor 26 at the end point The device 26 is connected to the driving paddle 21, and the driving paddle 21 engages with the ratchet teeth 221 to drive the ratchet teeth 221 to step and rotate, and the piston 23 is driven by the transmission member 22 to push the drug to achieve infusion; then the power supply path loses power, the memory metal part 1 changes from a contracted state to an extended state, the reset spring 25 drives the driving paddle 21 to move toward the starting point, and the check paddle 24 slides into the next level of teeth of the ratchet teeth 221 to prevent the ratchet teeth 221 from rotating; until the travel contact sensor 26 at the starting point is connected to the driving paddle 21, the power supply path can be energized again and the above process is repeated.

[0062] Please refer to Figure 6 , Figure 6 A schematic diagram of the structure of the power supply path provided in an embodiment of the present application.

[0063] In a specific implementation, the memory metal piece 1 , the driving paddle 21 and the return spring 25 are all made of conductive materials, and the return spring 25 , the driving paddle 21 and the memory metal piece 1 are sequentially connected to form a power supply path.

[0064] In this embodiment, the memory metal piece 1 has a memory effect and electrical conductivity, and the reset spring 25 also has electrical conductivity. This embodiment innovatively applies the reset spring 25 to the power supply, thereby starting the movement of the mechanism.

[0065] In some embodiments, the infusion mechanism 2 further includes a first power supply contact metal sheet 27 and a second power supply contact metal sheet 28 , the first power supply contact metal sheet 27 is connected to the return spring 25 , and the second power supply contact metal sheet 28 is connected to the memory metal piece 1 .

[0066] In this embodiment, the first power supply contact metal sheet 27 and the second power supply contact metal sheet 28 are respectively connected to the power supply points on the circuit board, forming a power supply path connected to the power supply points on the circuit board as follows: the first power supply contact metal sheet 27, the return spring 25, the drive paddle 21, the memory metal part 1, and the second power supply contact metal sheet 28.

[0067] Please refer to Figure 7 and Figure 8 , Figure 7 A schematic diagram of the structure of the base provided in the embodiment of the present application, Figure 8 for Figure 7 Schematic diagram of the structure with the bottom of the middle base facing upward.

[0068] In some embodiments, the infusion drive device further includes a base 3 , on which a memory metal piece 1 , a power supply path and an infusion mechanism 2 are mounted, and the memory metal piece 1 and the power supply path are located on the back side of the base 3 .

[0069] In this embodiment, the base 3 serves as the foundation of all components. Its function includes not only the installation and matching of components, but also the consideration of friction and the influence on the stability and reliability of the overall structure.

[0070] In some embodiments, the memory metal piece 1 is in a wire shape, a sliding wheel 31 is provided on the back side of the base 3 , the memory metal piece 1 is wound around the sliding wheel 31 and tensioned, and the direction of the memory metal piece 1 can be changed by the sliding wheel 31 .

[0071] Optionally, the memory metal material used in the memory metal part 1 is nickel-titanium alloy, which has the characteristics of shape memory and superelasticity and can achieve shape memory transformation by generating heat through electricity.

[0072] The present application also provides an insulin pump, including the above-mentioned infusion drive device, the insulin pump also includes a drug storage bin 4, the drug storage bin 4 is provided with a drug push port and a drug outlet 41, the drug push port is used to cooperate with the infusion mechanism 2, and the drug liquid inside the drug storage bin 4 is pushed out of the drug outlet 41 through the infusion mechanism 2.

[0073] Please refer to Figures 9 to 11 , Fig. 9 This is a schematic diagram of the structure of the piston provided in the embodiment of the present application. Fig.10 This is a schematic diagram of the structure of the medicine storage bin provided in the embodiment of the present application. Fig.11 A schematic diagram of the structure of the piston and medicine storage chamber after being combined according to an embodiment of the present application.

[0074] like Figure 7 and Fig.10 As shown, the base 3 is provided with a mounting groove 33, and the medicine storage bin 4 is provided with a mounting protrusion 42. The positioning and matching of the mounting protrusion 42 and the mounting groove 33 are used to achieve the positioning and installation of the medicine storage bin 4 on the base 3. Fig. 9 and Fig.11 As shown, a sealing ring 232 is provided on the piston 23, and the sealing ring 232 is used to seal the medicine storage chamber 4, so as to achieve reliable sealing during the storage and infusion of insulin liquid.

[0075] In a specific implementation, please continue to refer to Figures 1 to 11 The following description is made by taking the memory metal part 1 using the memory metal wire as an example.

[0076] The driving paddle 21 is placed on the base 3 and is made of conductive material; there is a side arm on one side of the driving paddle 21, which is thinner than the main body of the driving paddle 21 and has a certain elasticity, and the side arm rests on the ratchet teeth 221; there is a contact structure for cooperating with the travel contact sensor 26 on the other side of the driving paddle 21; the front end of the driving paddle 21 is a flat structure; the rear end of the driving paddle 21 has a folded structure for assembling with the memory metal wire; a strip hole is opened in the middle of the driving paddle 21 for assembling with the reset spring 25.

[0077] The memory wire is made of nickel-titanium alloy, has a memory effect, and is also conductive. The tail end of the driving paddle 21 is folded in half to tightly clamp one end of the nickel-titanium alloy memory wire, and spot welding is used to form a rigid connection to form conduction (nickel-titanium alloy and copper-iron materials cannot be conventionally welded); the other end of the memory wire is clamped by the bending structure of the second power supply contact metal sheet 28 in the same way, and spot welding is used to form a rigid connection to form conduction. The memory wire changes the wiring direction through two sliding wheels 31. The memory wire is in a stretched state when it is not powered on, and the length of the memory wire is just fixed on the base 3 in this state.

[0078] The second power supply contact metal sheet 28 is made of conductive material; the second power supply contact metal sheet 28 is located on the side of the memory metal wire, with a hole in the middle, and the second power supply contact metal sheet 28 is fixed on the base 3 through the hole; one side of the second power supply contact metal sheet 28 is a wall-shaped structure bent into a contact shape, which presses on the power supply point on the circuit board, and the other side is a folded structure, which is used to press the memory metal wire and form a rigid connection and conduction through spot welding.

[0079] The reset spring 25 is made of a metal conductive material and is elastic. It is fixed on a mounting column on the other side of the base 3 opposite to the mounting surface of the driving paddle 21. The reset spring 25 is in a pre-tightened state and has elastic potential energy. The reset spring 25 has two ends. The short end has an initial force due to the compression of the reset spring 25, so it presses on the first power supply contact metal sheet 27 and conducts. The other long end passes through the holes of the base 3 and the driving paddle 21 and hooks the driving paddle 21. Because the reset spring 25 is compressed and has an initial force, it presses the driving paddle 21 to form conduction, and the driving paddle 21 is pressed against the limiting rib of the base 3 by the reset spring 25.

[0080] The first power supply contact metal sheet 27 is made of conductive material; the first power supply contact metal sheet 27 is located on the side of the reset spring 25, and is provided with a hole in the middle, and the first power supply contact metal sheet 27 is fixed on the base 3 through the hole; one side of the first power supply contact metal sheet 27 is a wall-shaped structure bent into a contact shape, which presses on the power supply point on the circuit board, and the other side extends through the base 3 to the short end of the reset spring 25 and forms conduction with the reset spring 25.

[0081] The travel contact sensor 26 is a spring pin made of conductive material, one end of which is fixed on the base 3 and the other end of which is a spring pin pressed against the contact position of the circuit board; the side wall of the travel contact sensor 26 contacts the driving paddle 21 to form conduction; there are two travel contact sensors 26, and the two travel contact sensors 26 correspond to the starting point and end point of the reciprocating motion of the driving paddle 21 respectively.

[0082] The base 3 is made of plastic and is the basis for installing all components. It has low surface friction. One side of the base 3 is provided with ribs and holes for installing the above-mentioned components, which can ensure the reliable installation and force of the above-mentioned components. The base 3 is provided with guide rails and ribs to reduce friction around and below the installation position of the drive paddle 21.

[0083] Description of the movement of the driving paddle 21: the first power supply contact metal sheet 27+the return spring 25+the driving paddle 21+the memory metal wire+the second power supply contact metal sheet 28 form a power supply path. In the initial state, no voltage is applied to the power supply path, the memory wire is in a stretched state, the driving paddle 21 is pressed by the return spring 25 against the starting limit rib of the reciprocating stroke of the base 3, and the paddle contacts the starting contact sensor; when the path is energized, the memory wire generates heat due to resistance, triggering the memory effect of the memory wire, changing from a stretched state to a contracted state, pulling the driving paddle 21 to slide in the track defined by the base 3 to reach the end limit rib of the reciprocating stroke, the driving paddle 21 contacts the end contact sensor, the return spring 25 is pulled and deformed by the driving paddle 21, and the side arm of the driving paddle 21 is embedded in the ratchet teeth 221 to form an engagement, driving the ratchet teeth 221 to step and rotate; then the power supply path loses power, the memory wire cools from the contracted state to a stretched state due to temperature cooling, the driving paddle 21 returns to the initial state under the action of the return spring 25 and reaches the starting position of the reciprocating motion, and the side arm of the driving paddle 21 is disengaged from the engagement with the ratchet teeth 221 and slides to the next level of ratchet teeth 221.

[0084] The middle section of the outer wall of the transmission member 22 has a raised structure similar to a flange-shaped surface, and ratchet teeth 221 are distributed around the structure. The ratchet teeth 221 contact the driving paddle 21 and the check paddle 24 to form a transmission structure; the end face of the transmission member 22 is provided with two step surfaces, which are used to play an axial limiting role when the transmission member 22 is installed in the mounting groove of the base 3; the inner wall of the transmission member 22 is provided with an internal thread, which is used to engage with the thread on the threaded rod 231.

[0085] There is an installation groove for placing the transmission member 22 on the plastic base 3. In order to reduce friction, two groups of three-directional point connection contact structures are set at the rotation point between the base 3 and the transmission member 22; two installation grooves for fixing rods 32 are set on the base 3. By placing the fixing rods 32 into the grooves, the plastic is subjected to stress deformation to achieve the fixation of the fixing rods 32. The two groups of fixing rods 32 and the two groups of three-point connection structures limit the rotation position of the threaded rod 231 through two groups of eight contact points in total. At the same time, the threaded rod 231 also forms an axial limit with the inner wall of the groove of the base 3 through the two step surfaces of the transmission member 22.

[0086] The non-return paddle 24 is made of metal and is elastic. The middle is a non-return end and the two sides are fixed arms. The fixed arms have openings therein for fixing on the base 3 .

[0087] Description of the movement of the transmission member 22: In the initial state, the memory wire is not energized, and the non-return end of the non-return paddle 24 is embedded in the ratchet teeth 221 to prevent the ratchet teeth 221 from rotating, and the side arm of the driving paddle 21 does not form a top-pressure engagement with the ratchet teeth 221; after the memory wire is energized, the side arm of the driving paddle 21 is pressed and embedded in the ratchet teeth 221 to form an engagement, driving the ratchet teeth 221 to rotate step by step, and the current engagement between the non-return end of the non-return paddle 24 and the ratchet teeth 221 fails, and slides into the next-level ratchet teeth 221; after the memory wire loses power, the side arm of the driving paddle 21 is disengaged from the top-pressure engagement with the ratchet teeth 221 under the action of the reset spring 25 and slides to the next-level ratchet. At this time, the non-return paddle 24 is in top-pressure engagement with the ratchet teeth 221 to prevent the transmission member 22 from rotating due to friction during the retreat stroke of the side arm of the driving paddle 21.

[0088] A wall-shaped installation area for installing the medicine storage bin 4 is provided on the base 3, and an installation groove is provided at one end of the wall area for engaging with the raised structure at one end of the medicine storage bin 4, and an installation groove 33 is provided on the other side of the wall area for engaging with the installation protrusion 42 at the other end of the medicine storage bin 4.

[0089] The drug storage bin 4 is made of plastic and is installed on the base 3. One end of the drug storage bin 4 is provided with two cylindrical mounting protrusions 42 for embedding into the mounting groove 33 of the base 3. The end is also provided with a drug outlet 41, which can be connected with other modules (such as implant needles, etc.) through a pipeline; the other end of the drug storage bin 4 is an open structure, which can be used as a drug pushing port to cooperate with the piston 23. The drug storage bin 4 and the piston 23 are tightly fitted through the sealing ring 232 on the piston 23. The space surrounded by the drug storage bin 4, the sealing ring 232 and the piston 23 is the drug liquid storage area. The edge of the other end has a raised structure for embedding into the base 3, and cooperating with the aforementioned two mounting protrusions 42, so that the drug storage bin 4 can be tightly installed in the drug storage bin 4 installation area surrounded by the base 3 without relative displacement.

[0090] The piston 23 is made of plastic, and the front end of the piston 23 is a sealing surface that matches 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 has a groove surrounding the piston 23 for nesting the sealing ring 232, and the piston 23 cooperates with the sealing ring 232 to slide back and forth in the medicine storage bin 4.

[0091] The threaded rod 231 is made of metal and is in the shape of a long cylinder. The surface of the threaded rod 231 has threads that match the threads on the inner wall of the transmission member 22. The threaded rod 231 and the transmission member 22 are coaxially matched. The threaded rod 231 and the transmission member 22 are engaged through threads. One end of the threaded rod 231 is combined with the piston 23 as a whole. In the initial state, the remaining part of the threaded rod 231 is completely surrounded by the transmission member 22.

[0092] Description of the pushing motion of the piston 23: In the initial state, the piston 23 and the sealing ring 232 are placed at the maximum scale line of the drug storage bin 4, the drug liquid is filled in the drug storage bin 4, and the exposed part of the threaded rod 231 is completely surrounded by the transmission member 22; the drug storage bin 4 and the base 3 are firmly installed without relative displacement, and the piston 23 cannot rotate in the drug storage bin 4 due to the same shape as the inner wall of the drug storage bin 4. Further, the threaded rod 231 connected to the piston 23 cannot rotate; as the transmission member 22 rotates, the threaded rod 231 that cannot rotate in the transmission member 22 and the transmission member 22 produce axial displacement due to the action of the thread, and the transmission member 22 cannot move axially along the transmission member 22 due to the ratchet structure and the step surface at the connection between the transmission member 22 and the inner wall of the base 3, so the threaded rod 231 pushes the piston 23 seal ring to move axially from the maximum scale line to the zero scale line along the threaded rod 231 in the drug storage bin 4, so that under the action of the hydraulic pressure, the drug liquid in the drug storage bin 4 is retained from the drug outlet 41 into other modules of the pump body and then into the patient's body.

[0093] In summary, compared with the traditional insulin pump using a micro motor as a driving method, the insulin pump and its infusion drive device have a series of advantages by adopting structures such as memory alloys:

[0094] Cost-effectiveness: This application uses memory alloys such as nickel-titanium alloy as driving materials. Compared with micro motors, these materials are relatively cheap. The mechanical structure is relatively simple and the manufacturing cost is more economical.

[0095] High reliability: Due to the use of memory alloy, this material has good reliability and stability and is not prone to failure. In contrast, micro motors have risks such as circuit failure and control stability.

[0096] Precise control: The design of the mechanical structure allows for more precise control of the amount and frequency of drug delivery, thereby better meeting the patient's personalized treatment needs. Compared with the digital control of micromotors, the mechanical structure is easier to adjust and optimize.

[0097] Lightweight design: It avoids the use of traditional motors, reducer gear sets and other components, making the entire device lighter and more suitable for patients to carry and use.

[0098] Reduced electromagnetic radiation: Since no micro-motors are used, the radiation level is low, which helps reduce the patient's radiation exposure risk.

[0099] It should be noted that many of the components mentioned in this application are universal standard parts or components known to those skilled in the art, and their structures and principles can be learned by those skilled in the art through technical manuals or through conventional experimental methods.

[0100] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0101] The insulin pump and the infusion drive device thereof provided by the present application are introduced in detail above. The principle and implementation mode of the present application are described by using specific examples herein, and the description of the above embodiments is only used to help understand the method and the core idea of ​​the present application. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. An infusion drive device, characterized in that: The infusion drive device includes a memory metal piece, a power supply path and an infusion mechanism. The memory metal piece is connected to the power supply path. The memory metal piece is used to deform to output power when the power supply path is energized. The power output end of the memory metal piece is connected to the power input end of the infusion mechanism. The infusion mechanism is used to realize the infusion of the drug under the drive of the memory metal piece.

2. The infusion drive device according to claim 1, characterized in that: The infusion mechanism includes a driving paddle, a transmission member and a piston. The driving paddle is connected to the memory metal member and is used to move under the drive of the memory metal member. The piston is connected to the driving paddle through the transmission member, and the piston is used to realize the infusion of the drug.

3. The infusion drive device according to claim 2, characterized in that: The transmission member is provided with ratchet teeth on its outer periphery, the ratchet teeth cooperate with the drive paddle, and the ratchet teeth are used to make stepping movements under the action of the drive paddle. The transmission member is provided with a threaded surface on its inner periphery, the threaded surface cooperates with the threaded rod of the piston, and the threaded surface is used to drive the piston to move when the transmission member rotates.

4. The infusion drive device according to claim 3, characterized in that: The infusion mechanism also includes a check paddle and a reset spring. The check paddle cooperates with the ratchet teeth and is used to limit the rotation of the ratchet teeth. The reset spring is connected to the drive paddle and is used to drive the drive paddle to return to an initial position of driving the ratchet teeth when the power supply path is powered off, so as to realize the reciprocating motion of the drive paddle under the action of the power supply path and the reset spring.

5. The infusion drive device according to claim 4, characterized in that: The infusion mechanism further comprises a travel contact sensor, wherein the travel contact sensors are two and are respectively arranged at the starting point and the end point of the reciprocating motion of the driving paddle.

6. The infusion drive device according to claim 4, characterized in that: The memory metal piece, the driving paddle and the return spring are all made of conductive materials, and the return spring, the driving paddle and the memory metal piece are sequentially connected to form the power supply path.

7. The infusion drive device according to claim 6, characterized in that: The infusion mechanism further comprises a first power supply contact metal sheet and a second power supply contact metal sheet, wherein the first power supply contact metal sheet is connected to the reset spring, and the second power supply contact metal sheet is connected to the memory metal piece.

8. The infusion drive device according to any one of claims 1 to 7, characterized in that: The infusion drive device further comprises a base, on which the memory metal piece, the power supply path and the infusion mechanism are mounted, and the memory metal piece and the power supply path are located on the back side of the base.

9. The infusion drive device according to claim 8, characterized in that: The memory metal piece is in a wire shape, a sliding wheel is arranged on the back side of the base, and the memory metal piece is wound around the sliding wheel to achieve tension.

10. An insulin pump, characterized in that: It comprises the infusion drive device as described in any one of claims 1 to 9, wherein the insulin pump further comprises a drug storage bin, the drug storage bin is provided with a drug pushing port and a drug outlet, the drug pushing port is used to cooperate with the infusion mechanism to push the drug liquid inside the drug storage bin out of the drug outlet through the infusion mechanism.

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