Infusion driving mechanism for application type medicine infusion device and control method

Abstract

The invention discloses an infusion driving mechanism for an application type medicine infusion device, and relates to the technical field of medical instruments.The infusion driving mechanism comprises a piston, a ratchet wheel thread sleeve, a memory metal wire, a reset assembly and a non-return assembly, the piston is arranged in a medicine storage bin in a sliding mode, a screw is arranged on the shaft portion of the piston, and the ratchet wheel thread sleeve is arranged on the screw in a sleeving mode and is in threaded connection with the screw; the memory metal wire is arranged in the ratchet wheel threaded sleeve, one end of the memory metal wire is provided with the shifting piece assembly, the shifting piece assembly is used for reciprocating along with the memory metal wire so as to drive the ratchet wheel threaded sleeve to rotate, the reset assembly is arranged between the shifting piece assembly and the ratchet wheel threaded sleeve, and the non-return assembly is arranged on one side of the ratchet wheel threaded sleeve. The size of an application product is effectively reduced, and the carrying convenience of the application type insulin is improved. The invention further discloses a control method of the infusion driving mechanism for the application type medicine infusion device. The control method is applied to the infusion driving mechanism for the application type medicine infusion device.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and more specifically, to an infusion drive mechanism for a patch-type drug infusion device. The present invention also relates to a control method for the infusion drive mechanism for a patch-type drug infusion device, which is applied to the infusion drive mechanism for the patch-type drug infusion device. Background Art

[0002] The patch-type drug infusion device is an innovative drug delivery method that achieves the therapeutic effect of the drug by applying the drug directly to the patient's skin and utilizing the skin's absorption capacity. The device is usually used on a patch-type insulin pump, which is usually used to simulate the insulin secretion function of the pancreas.

[0003] Currently available patch-type insulin pumps are limited in size and are difficult to accommodate large drive devices. They usually adopt a split design, which affects the miniaturization and portability of the product.

[0004] In summary, how to solve the problem that the existing patch-type insulin pump is large in size and not easy to carry is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0005] In view of this, an object of the present invention is to provide an infusion drive mechanism for a patch-type drug infusion device, which can effectively reduce the volume of the application product and improve the portability of the patch-type insulin.

[0006] Another object of the present invention is to provide a control method for an infusion drive mechanism for a patch-type drug infusion device, which is applied to the infusion drive mechanism for the patch-type drug infusion device.

[0007] In order to achieve the above object, the present invention provides the following technical solutions:

[0008] An infusion drive mechanism for a patch-type drug infusion device, comprising:

[0009] A piston, wherein the piston is slidably disposed in the medicine storage bin, and a screw is fixedly disposed on the piston shaft;

[0010] A ratchet nut sleeve, which is sleeved on the screw rod and threadedly connected to the screw rod, and the ratchet nut sleeve is fixed in space and can only rotate along its own axial direction;

[0011] A memory metal wire, one end of which is provided with a paddle assembly, and the paddle assembly is used to reciprocate with the memory metal wire and thus drive the ratchet nut to rotate;

[0012] A reset assembly, the reset assembly being arranged between the paddle assembly and the ratchet nut sleeve to reset the paddle assembly;

[0013] A non-return assembly is arranged on one side of the ratchet nut sleeve, and the non-return assembly is used for preventing the ratchet nut sleeve from returning.

[0014] Preferably, the paddle assembly comprises a driving paddle, one end of which is fixedly connected to the memory wire, and the driving paddle is provided with paddle teeth meshing with ratchet teeth on the ratchet nut;

[0015] A mounting assembly is provided between the driving paddle and the ratchet nut sleeve, and the mounting assembly is used for the driving paddle to be rotatably arranged on the ratchet nut sleeve;

[0016] The reset component is arranged between the mounting component and the ratchet nut, and the reset component is used to drive the driving paddle to reset after the memory wire is reset.

[0017] Preferably, the mounting assembly includes a driving ring sleeved on the ratchet nut, a mounting platform is provided on one side of the driving ring, a surface of the mounting platform is tangent to an outer surface of the driving ring, and a clamping structure is provided between the mounting platform and the driving paddle so that the driving paddle is fixed on the mounting platform.

[0018] Preferably, the snap-fit ​​structure comprises an elastic snap-fit ​​fixedly disposed on the mounting platform, and the driving paddle is provided with a snap-fitting groove which is snap-fitted with the elastic snap-fit.

[0019] Preferably, the reset assembly comprises a reset torsion spring sleeved on the drive ring, one end of the reset torsion spring is fixedly disposed between the mounting platform and the drive paddle, and the other end of the reset torsion spring is fixedly disposed in the infusion device.

[0020] Preferably, the reset assembly comprises a reset spring, one end of which is fixedly disposed in the infusion device, and the other end of which abuts against a side of the drive paddle close to the memory wire.

[0021] Preferably, the non-return assembly comprises a non-return paddle fixedly disposed in the infusion device, one end of the non-return paddle is engaged with the ratchet teeth on the ratchet nut so that the ratchet nut does not rotate.

[0022] Preferably, the check plate includes a fixed portion and a check portion, the fixed portion is fixedly disposed in the infusion device, the check portion is a spring plate, one end of the check portion is fixedly connected to the fixed portion, and the other end of the check portion is engaged with the ratchet teeth of the ratchet nut.

[0023] Preferably, a sealing ring is fixedly sleeved on the outer surface of the piston, and a side of the sealing ring facing away from the piston abuts against an inner wall of the medicine storage bin.

[0024] A control method for an infusion drive mechanism for a patch-type drug infusion device is applied to any of the above-mentioned infusion drive mechanisms for a patch-type drug infusion device, and the control method comprises:

[0025] Controlling the two ends of the memory metal wire to be energized, detecting the temperature of the memory metal wire, when the temperature reaches the phase change temperature of the memory metal wire, the memory metal wire changes from a stretched state to a contracted state and controls the movement of the paddle assembly, and the movement of the paddle assembly drives the ratchet nut sleeve to rotate;

[0026] The rotation of the ratchet nut drives the screw to rotate, thereby controlling the piston to slide along the inner wall of the medicine storage bin, so as to squeeze out the medicine liquid in the medicine storage bin;

[0027] Controlling the two ends of the memory metal wire to lose power, the temperature of the memory metal wire gradually becomes lower than the phase change temperature, the memory metal wire changes from a contracted state to an extended state, controlling the reset component to drive the paddle component to reset, and controlling the non-return component to prevent the ratchet nut from rotating;

[0028] By controlling the power on and off of the two ends of the memory metal wire, the memory metal wire is controlled to change repeatedly between the stretched state and the contracted state, thereby driving the piston to realize the step-by-step extrusion of the medicine liquid in the medicine storage bin.

[0029] The infusion drive mechanism for the patch-type drug infusion device provided by the present invention comprises a piston, which is slidably arranged in a drug storage bin, a screw rod being fixedly arranged on the piston shaft, a ratchet nut, which is sleeved on the screw rod and threadedly connected to the screw rod, the ratchet nut being fixed in a spatial position and only capable of rotating along its own axial direction, a memory wire, a paddle assembly being arranged at one end of the memory wire, the paddle assembly being used for reciprocating with the memory wire and thereby driving the ratchet nut to rotate, a reset assembly, which is arranged between the paddle assembly and the ratchet nut to reset the paddle assembly, and a check assembly, which is arranged at one side of the ratchet nut and used for checking the ratchet nut.

[0030] The infusion drive mechanism for the patch-type drug infusion device provided by the present invention uses a memory wire to realize the conversion of the memory wire between the stretched state and the telescopic state by turning the power on and off the memory wire, so that the memory wire produces a reciprocating deformation amount. When the memory wire changes from the stretched state to the contracted state, the paddle assembly is driven to move so that the ratchet screw sleeve rotates, and then the piston is driven to slide in the medicine storage bin by the screw rod to realize the extrusion of the liquid medicine in the medicine storage bin. When the memory wire changes from the contracted state to the stretched state, the reset assembly drives the paddle assembly to reset, and the check assembly prevents the ratchet screw sleeve from rotating, and the memory wire is reciprocated between the stretched state and the contracted state to realize the step-by-step extrusion of the liquid medicine in the medicine storage bin, thereby effectively reducing the volume of the application product and improving the portability of the patch-type insulin. At the same time, the use of the memory wire avoids some limitations on the accuracy of the liquid medicine infusion of the electric pump, especially when the low flow rate and small dose infusion may be difficult to accurately control, thereby improving the accuracy of the liquid medicine delivery. At the same time, because the present invention adopts a simplified mechanical structure, the maintenance difficulty of the equipment is effectively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the embodiments of the present invention 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 invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0032] Figure 1 This is a schematic diagram of the structure of the infusion drive mechanism and the drug storage bin in this embodiment;

[0033] Figure 2 Schematic diagram of the overall structure of the infusion drive mechanism in this embodiment;

[0034] Figure 3 This is a schematic diagram of the structure of the installation components in this embodiment;

[0035] Figure 4 This is a schematic diagram of the structure of the reset assembly using a reset spring in this embodiment.

[0036] Figure 1-Figure 4 , the reference numerals include:

[0037] 1. Medicine storage bin; 2. Piston; 3. Screw; 4. Ratchet nut; 5. Memory wire;

[0038] 6. paddle assembly; 61. driving paddle; 62. paddle teeth;

[0039] 7. Mounting assembly; 71. Driving ring; 72. Mounting platform;

[0040] 8. Reset assembly; 81. Reset torsion spring; 82. Reset spring;

[0041] 9. Snap-fit ​​structure; 91. Elastic snap buckle; 92. Slot;

[0042] 10. non-return assembly; 101. non-return paddle; 1011. fixing portion; 1012. non-return portion;

[0043] 11. Sealing ring. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] Unless otherwise defined, the technical terms or scientific terms used in the disclosure of this application should have the usual meaning understood by people with ordinary skills in the field to which the invention belongs. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right", etc. are only used to indicate relative position relationships. When the absolute position of the described object changes, the relative position relationship may also change accordingly. The embodiment of the present application discloses an infusion drive mechanism and control method for a patch-type drug infusion device.

[0046] The core of the present invention is to provide an infusion drive mechanism for a patch-type drug infusion device.

[0047] Another core of the present invention is to provide a control method for an infusion drive mechanism for a patch-type drug infusion device, which is applied to the infusion drive mechanism for the patch-type drug infusion device.

[0048] Please refer to Figures 1 to 4 The infusion drive mechanism for the patch-type drug infusion device provided by the present invention comprises:

[0049] A piston 2 is slidably disposed in the medicine storage bin 1, and a screw 3 is fixedly disposed on the shaft of the piston 2;

[0050] The ratchet nut 4 is sleeved on the screw rod 3 and is threadedly connected to the screw rod 3. The ratchet nut 4 is fixed in space and can only rotate along its own axial direction.

[0051] A memory wire 5, one end of which is provided with a paddle assembly 6, which is used to reciprocate with the memory wire 5 and drive the ratchet nut 4 to rotate;

[0052] A reset assembly 8, which is disposed between the paddle assembly 6 and the ratchet nut 4 to reset the paddle assembly 6;

[0053] The non-return assembly 10 is arranged at one side of the ratchet nut 4 , and the non-return assembly 10 is used for preventing the ratchet nut 4 from returning.

[0054] The infusion drive mechanism for the patch-type drug infusion device provided by the present invention realizes the conversion of the memory wire 5 between the stretched state and the telescopic state by turning the power on and off the memory wire 5, so that the memory wire 5 produces a reciprocating deformation amount. When the memory wire 5 changes from the stretched state to the contracted state, it drives the paddle assembly 6 to move to rotate the ratchet screw sleeve 4, and then drives the piston 2 to slide in the medicine storage chamber 1 through the screw rod 3 to realize the extrusion of the medicine liquid in the medicine storage chamber 1. When the memory wire 5 changes from the contracted state to the stretched state, the reset assembly 8 drives the paddle assembly 6 to reset, and at the same time the check assembly 10 prevents the ratchet screw sleeve 4 from rotating, and the memory wire 5 is reciprocated between the stretched state and the contracted state to realize the step-by-step extrusion of the medicine liquid in the medicine storage chamber 1.

[0055] The above-mentioned infusion drive mechanism for the patch-type drug infusion device uses a memory wire 5 to replace large structures such as motors, which effectively reduces the volume of the application product and improves the portability of the patch-type insulin. At the same time, the use of the memory wire 5 avoids some limitations on the accuracy of the electric pump in the infusion of the drug solution, especially when the low flow rate and small dose infusion may be difficult to accurately control, thereby improving the accuracy of the drug delivery. At the same time, since the present invention adopts a simplified mechanical structure, the maintenance difficulty of the equipment is effectively reduced.

[0056] The infusion drive mechanism for the patch-type drug infusion device provided by the present invention is described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0057] In a specific embodiment, reference Figures 1 to 3 The paddle assembly 6 includes a driving paddle 61, one end of which is fixedly connected to the memory wire 5, and the driving paddle 61 is provided with a paddle tooth 62 that meshes with the ratchet teeth on the ratchet nut 4. A mounting assembly 7 is provided between the driving paddle 61 and the ratchet nut 4, and the mounting assembly 7 is used to drive the paddle 61 to rotate and be arranged on the ratchet nut 4. A reset assembly 8 is provided between the mounting assembly 7 and the ratchet nut 4, and the reset assembly 8 is used to drive the driving paddle 61 to reset after the memory wire 5 is reset.

[0058] Specifically, the memory wire 5 is powered on and off. When the memory wire 5 is powered on, the memory wire 5 generates heat due to resistance. When the temperature reaches the phase change temperature of the memory wire 5, the memory wire 5 changes from an extended state to a contracted state and drives the driving paddle 61 to move toward the ratchet nut 4. During the movement of the driving paddle 61, since the paddle teeth 62 on the driving paddle 61 are engaged with the ratchet teeth on the ratchet nut 4, during the movement of the driving paddle 61, the ratchet nut 4 is driven to rotate axially through the paddle teeth 62. At the same time, since the spatial position of the ratchet nut 4 remains fixed and can only rotate axially along itself, during the rotation of the ratchet nut 4, the screw 3 is driven to move along the axis of the medicine storage bin 1, so that the piston 2 on the screw 3 slides toward the medicine storage bin 1, and the liquid medicine in the medicine storage bin 1 is extruded. When the memory wire 5 is powered off, the memory wire 5 changes from a contracted state to an extended state, and drives the driving paddle 61 to reset under the action of the reset assembly 8. During the reset process of the driving paddle 61, the reverse rotation of the ratchet nut 4 is prevented by the non-return assembly 10. The memory wire 5 is repeatedly powered on and off to realize the step-by-step movement of the piston 2.

[0059] Based on any of the above embodiments, Figures 1 to 3 The mounting assembly 7 includes a driving ring 71 sleeved on the ratchet nut 4, a mounting platform 72 is provided on one side of the driving ring 71, the surface of the mounting platform 72 is tangent to the outer surface of the driving ring 71, and a clamping structure 9 is provided between the mounting platform 72 and the driving paddle 61 so that the driving paddle 61 is fixed on the mounting platform 72.

[0060] Specifically, the installation of the mounting platform 72 facilitates the installation of the driving paddle 61, and the driving paddle 61 is fixedly clamped on the mounting platform 72 in cooperation with the clamping structure 9. The driving ring 71 facilitates the driving paddle 61 to rotate and move along the shaft of the ratchet nut 4, and avoids the ratchet nut 4 being synchronously driven to reset during the resetting process of the driving paddle 61, ensuring the independence of the driving paddle 61 except for the engagement of the paddle teeth 62 with the ratchet teeth on the ratchet nut 4, and avoiding operation failures caused by the linkage between structures.

[0061] Based on any of the above embodiments, Figure 2 and Figure 3 The snap-fit ​​structure 9 includes an elastic snap-fit ​​91 fixedly disposed on the mounting platform 72 , and a snap-fit ​​groove 92 for snap-fitting with the elastic snap-fit ​​91 is provided on the driving paddle 61 .

[0062] Specifically, align the slot 92 on the drive paddle 61 with the elastic buckle 91 on the mounting platform 72 so that the elastic buckle 91 and the slot 92 are engaged with each other to complete the installation of the drive paddle 61 on the mounting platform 72. The cooperation between the elastic buckle 91 and the slot 92 can also facilitate the disassembly and installation of the drive paddle 61.

[0063] It should be noted that, in some other embodiments, the snap-fit ​​structure 9 may also adopt other snap-fit ​​structures, such as the cooperation of a slide groove and a block, or the cooperation of an electromagnet and a magnet to achieve a fixed connection between the driving paddle 61 and the mounting platform 72.

[0064] Based on any of the above embodiments, Figures 1 to 3 The reset assembly 8 includes a reset torsion spring 81 sleeved on the drive ring 71, one end of the reset torsion spring 81 is fixedly disposed between the mounting platform 72 and the drive paddle 61, and the other end of the reset torsion spring 81 is fixedly disposed in the infusion device.

[0065] Specifically, in the process of the driving paddle 61 moving under the traction of the memory wire 5, one end of the reset torsion spring 81 accumulates force as the driving paddle 61 moves, and the other end of the reset torsion spring 81 is fixed. When the memory wire 5 recovers from the contracted state to the expanded state, the reset torsion spring 81 releases the accumulated force, driving the driving paddle 61 to return to its initial position, thereby resetting the driving paddle 61.

[0066] In some other embodiments, reference Figure 4 The reset assembly 8 may further include a reset spring 82 , one end of which is fixedly disposed in the infusion device, and the other end of the reset spring 82 abuts against a side of the driving paddle 61 close to the memory wire 5 .

[0067] Specifically, one end of the return spring 82 is nested in the side of the driving paddle 61 close to the memory wire 5, and the other end of the return spring 82 remains absolutely fixed in the device. Similar to the above-mentioned return torsion spring 81, the return spring 82 accumulates force during the movement of the driving paddle 61. When the memory wire 5 recovers from the contracted state to the expanded state, the return spring 82 releases the accumulated force, driving the driving paddle 61 to return to its initial position, thereby realizing the reset of the driving paddle 61.

[0068] Based on any of the above embodiments, Figures 1 to 3 The non-return assembly 10 includes a non-return paddle 101 fixedly disposed in the infusion device, and one end of the non-return paddle 101 is engaged with the ratchet teeth on the ratchet nut 4 to prevent the ratchet nut 4 from rotating.

[0069] Specifically, when both ends of the memory wire 5 are energized, the paddle assembly 6 is driven to move, and the paddle assembly 6 drives the ratchet nut 4 to rotate, and one end of the non-return paddle 101 fails to engage with the ratchet teeth of the current ratchet nut 4, and one end of the non-return paddle 101 slides into the next level of ratchet teeth to form an engagement.

[0070] When both ends of the memory wire 5 lose power, the paddle assembly 6 returns to its initial position under the action of the reset assembly 8, while one end of the non-return paddle 101 continues to engage with the ratchet teeth of the ratchet nut 4, thereby preventing the ratchet nut 4 from being driven to rotate by the friction force generated when the paddle assembly 6 retreats.

[0071] Based on any of the above embodiments, Figures 1 to 3 The check paddle 101 includes a fixing portion 1011 and a check portion 1012 . The fixing portion 1011 is fixedly disposed in the infusion device. The check portion 1012 is a spring. One end of the check portion 1012 is fixedly connected to the fixing portion 1011 , and the other end of the check portion 1012 is engaged with the ratchet teeth of the ratchet nut 4 .

[0072] Specifically, the fixing portion 1011 is a vertical plate, the non-return portion 1012 is a horizontal plate, and the fixing portion 1011 and the non-return portion 1012 are chamfered, wherein the non-return portion 1012 is provided with a spring plate, so that the non-return portion 1012 is convenient for meshing with the ratchet teeth on the ratchet nut 4, and the non-return portion 1012 is convenient for sliding into the next level of ratchet teeth for continued meshing during the rotation of the ratchet nut 4. The fixing portion 1011 facilitates the overall fixation of the non-return paddle 101, ensures that the non-return paddle 101 and the ratchet nut 4 remain relatively fixed in the internal space of the device, and facilitates the non-return portion 1012 of the non-return paddle 101 to mesh tangentially with the ratchet teeth of the ratchet nut 4.

[0073] Based on any of the above embodiments, Figure 2 A sealing ring 11 is fixedly sleeved on the outer surface of the piston 2 , and the side of the sealing ring 11 facing away from the piston 2 abuts against the inner wall of the medicine storage bin 1 .

[0074] Specifically, the piston 2 is provided with an installation groove on its circumference for facilitating the installation of the sealing ring 11. The sealing ring 11 is sleeved on the outer surface of the piston 2 through the installation groove. The sealing ring 11 effectively increases the friction between the piston 2 and the inner wall of the drug storage chamber 1, thereby preventing the drug liquid in the drug storage chamber 1 from leaking out and effectively improving the air tightness of the drug storage chamber 1. The material of the sealing ring 11 can be SIL silicone rubber or FLS fluorosilicone rubber, etc.

[0075] The present invention provides a control method for an infusion drive mechanism for a patch-type drug infusion device, which is applied to the above-mentioned infusion drive mechanism for a patch-type drug infusion device, wherein the control method includes:

[0076] Controlling the two ends of the memory metal wire 5 to be energized, detecting the temperature of the memory metal wire 5, when the temperature reaches the phase transition temperature of the memory metal wire 5, the memory metal wire 5 changes from a stretched state to a contracted state and controls the movement of the paddle assembly 6, and the movement of the paddle assembly 6 drives the ratchet nut 4 to rotate;

[0077] The rotation of the ratchet nut 4 drives the screw 3 to rotate, thereby controlling the piston 2 to slide along the inner wall of the medicine storage bin 1, so as to squeeze out the medicine liquid in the medicine storage bin 1;

[0078] The two ends of the memory wire 5 are controlled to lose power, the temperature of the memory wire 5 is gradually lower than the phase change temperature, the memory wire 5 changes from a contracted state to an extended state, the reset component 8 is controlled to drive the paddle component 6 to reset, and the check component 10 is controlled to prevent the ratchet nut 4 from rotating;

[0079] By controlling the power on and off of both ends of the memory metal wire 5 , the memory metal wire 5 is controlled to change repeatedly between the stretched state and the contracted state, thereby driving the piston 2 to achieve step-by-step extrusion of the drug solution in the drug storage chamber 1 .

[0080] The control method of the infusion drive mechanism for the patch-type drug infusion device provided by the present invention realizes the conversion of the memory wire 5 between the stretched state and the telescopic state by turning on and off the power of the memory wire 5, so that the memory wire 5 produces a reciprocating deformation amount. When the memory wire 5 changes from the stretched state to the contracted state, the paddle assembly 6 is driven to move to rotate the ratchet screw sleeve 4, and then the piston 2 is driven to slide in the medicine storage bin 1 through the screw 3 to realize the extrusion of the medicine liquid in the medicine storage bin 1. When the memory wire 5 changes from the contracted state to the stretched state, the reset assembly 8 drives the paddle assembly 6 to reset, and at the same time the check assembly 10 prevents the ratchet screw sleeve 4 from rotating, and the memory wire 5 is reciprocated between the stretched state and the contracted state to realize the step-by-step extrusion of the medicine liquid in the medicine storage bin 1.

[0081] The control method of the infusion drive mechanism of the above-mentioned patch-type drug infusion device effectively improves the convenience of the infusion drive mechanism in the patch-type drug infusion device. At the same time, the use of the memory metal wire 5 avoids some limitations of the electric pump in the accuracy of drug solution infusion, especially when low flow and small dose infusion may be difficult to accurately control, thereby improving the accuracy of drug solution delivery.

[0082] The above is a detailed introduction to the infusion drive mechanism and control method for a patch-type drug infusion device provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. An infusion drive mechanism for a patch-type drug infusion device, characterized in that: include: A piston (2), the piston (2) being slidably disposed in the medicine storage bin (1), and a screw rod (3) being fixedly disposed on the shaft of the piston (2); A ratchet nut (4), wherein the ratchet nut (4) is sleeved on the screw rod (3) and is threadedly connected to the screw rod (3); the ratchet nut (4) is fixed in position in space and can only rotate along its own axial direction; A memory metal wire (5), wherein one end of the memory metal wire (5) is provided with a paddle assembly (6), and the paddle assembly (6) is used to reciprocate with the memory metal wire (5) and thereby drive the ratchet nut (4) to rotate; a reset assembly (8), the reset assembly (8) being arranged between the paddle assembly (6) and the ratchet nut (4) so ​​as to reset the paddle assembly (6); A non-return component (10), wherein the non-return component (10) is arranged on one side of the ratchet nut (4), and the non-return component (10) is used for preventing the ratchet nut (4) from returning.

2. The infusion drive mechanism for a patch-type drug infusion device according to claim 1, characterized in that: The paddle assembly (6) comprises a driving paddle (61), one end of the driving paddle (61) being fixedly connected to the memory metal wire (5), and the driving paddle (61) being provided with paddle teeth (62) that mesh with ratchet teeth on the ratchet nut (4); A mounting assembly (7) is provided between the driving paddle (61) and the ratchet nut sleeve (4), and the mounting assembly (7) is used for rotatably mounting the driving paddle (61) on the ratchet nut sleeve (4); The reset component (8) is arranged between the mounting component (7) and the ratchet nut (4), and the reset component (8) is used to drive the driving paddle (61) to reset after the memory metal wire (5) is reset.

3. The infusion drive mechanism for a patch-type drug infusion device according to claim 2, characterized in that: The mounting assembly (7) comprises a driving ring (71) sleeved on the ratchet nut (4); a mounting platform (72) is provided on one side of the driving ring (71); a surface of the mounting platform (72) is tangent to an outer surface of the driving ring (71); and a clamping structure (9) is provided between the mounting platform (72) and the driving paddle (61) so that the driving paddle (61) is fixedly mounted on the mounting platform (72).

4. The infusion drive mechanism for a patch-type drug infusion device according to claim 3, characterized in that: The snap-fit ​​structure (9) comprises an elastic snap-fit ​​(91) fixedly arranged on the mounting platform (72), and the driving paddle (61) is provided with a snap-fitting groove (92) that is snap-fitted with the elastic snap-fit ​​(91).

5. The infusion drive mechanism for a patch-type drug infusion device according to claim 3, characterized in that: The reset assembly (8) comprises a reset torsion spring (81) sleeved on the drive ring (71), one end of the reset torsion spring (81) being fixedly disposed between the mounting platform (72) and the drive paddle (61), and the other end of the reset torsion spring (81) being fixedly disposed in the infusion device.

6. The infusion drive mechanism for a patch-type drug infusion device according to claim 2, characterized in that: The reset assembly (8) comprises a reset spring (82), one end of the reset spring (82) is fixedly disposed in the infusion device, and the other end of the reset spring (82) abuts against a side of the driving paddle (61) close to the memory metal wire (5).

7. The infusion drive mechanism for a patch-type drug infusion device according to claim 1, characterized in that: The non-return assembly (10) comprises a non-return paddle (101) fixedly arranged in the infusion device, one end of the non-return paddle (101) being engaged with the ratchet teeth on the ratchet nut (4) so ​​that the ratchet nut (4) does not rotate.

8. The infusion drive mechanism for a patch-type drug infusion device according to claim 7, characterized in that: The non-return paddle (101) comprises a fixing portion (1011) and a non-return portion (1012); the fixing portion (1011) is fixedly arranged in the infusion device; the non-return portion (1012) is a spring; one end of the non-return portion (1012) is fixedly connected to the fixing portion (1011); and the other end of the non-return portion (1012) is meshed with ratchet teeth of the ratchet nut (4).

9. An infusion drive mechanism for a patch-type drug infusion device according to any one of claims 1 to 8, characterized in that: A sealing ring (11) is fixedly sleeved on the outer surface of the piston (2), and a side of the sealing ring (11) facing away from the piston (2) abuts against an inner wall of the medicine storage bin (1).

10. A control method for an infusion drive mechanism for a patch-type drug infusion device, applied to an infusion drive mechanism for a patch-type drug infusion device as claimed in any one of claims 1 to 9, characterized in that: The control method comprises: Controlling the two ends of the memory metal wire (5) to be energized, detecting the temperature of the memory metal wire (5), and when the temperature reaches the phase change temperature of the memory metal wire (5), the memory metal wire (5) changes from an extended state to a contracted state and controls the movement of the paddle assembly (6), and the movement of the paddle assembly (6) drives the ratchet nut (4) to rotate; The ratchet nut (4) rotates to drive the screw (3) to rotate, thereby controlling the piston (2) to slide along the inner wall of the medicine storage bin (1), so as to squeeze out the medicine liquid in the medicine storage bin (1); Controlling the two ends of the memory metal wire (5) to lose power, the temperature of the memory metal wire (5) gradually drops below the phase change temperature, the memory metal wire (5) changes from a contracted state to an extended state, controlling the reset component (8) to drive the paddle component (6) to reset, and controlling the non-return component (10) to prevent the ratchet nut (4) from rotating; By controlling the power on and off of the two ends of the memory metal wire (5), the memory metal wire (5) is controlled to change repeatedly between the stretched state and the contracted state, thereby driving the piston (2) to achieve step-by-step extrusion of the drug liquid in the drug storage bin (1).

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