Piston driving device for continuous micro-dosing device and dosing device

Abstract

The utility model provides a piston driving device for a continuous micro-dosing device and a dosing device. The piston driving device for the continuous micro-dosing device comprises a shell, and a force storage device and a stored force release device are arranged on the shell; one end of the force storage device is connected with the piston body, the other end of the force storage device is connected with the shell, and the force storage device is in a force storage state; the accumulated force release device comprises a transmission tail end gear rotationally arranged on the shell, a reel is arranged on the transmission tail end gear, a pull wire is wound on the reel, and the pull wire extends to the piston body in the force release direction of the force storage device through the end, away from the piston body, of the force storage device and is connected with the piston body. The transmission tail end gear of the force storage release device rotates by a certain angle, the pull wire with a certain length is released, the piston body can move into the medicine storage device by a certain length under the action of the force of the force storage device, and therefore quantitative injection of liquid medicine is achieved, the structure is simple, and cost is low.

Description

Technical Field

[0001] The utility model relates to the technical field of medical devices, and in particular to a piston driving device and a drug delivery device for a continuous micro-dose drug delivery device. Background Art

[0002] Continuous drug administration refers to continuous drug administration every day to maintain the effective blood concentration of the drug. In the current clinical medical system, continuous drug administration is often used for treatment in medical fields such as endocrinology and analgesia.

[0003] Taking the treatment of diabetes as an example, there are currently two main methods for the treatment and control of diabetes: one is conventional treatment, which is 1-2 insulin injections and 1-2 blood sugar monitoring per day; the other is intensive treatment, which involves multiple blood sugar monitoring per day and continuous insulin infusion to simulate the way pancreatic cells secrete insulin, in order to keep blood sugar levels as close to normal as possible. This method is mostly achieved using an insulin pump.

[0004] The existing Chinese patent application document with publication number CN209984717U discloses a safe automatic insulin injection pen, including an insulin pen cartridge, a needle, a pen cartridge housing, an injection part, a control part and a push rod unit for removing the needle; the injection part includes an injection housing, a screw nut pair, a piston push plate and a first base for mounting a nut of the screw nut pair, and the outer ring of the nut of the screw nut pair is provided with gear teeth; the control part includes a control housing, a motor, a motor gear and a second base for mounting the motor gear, the outer ring of the motor gear is provided with gear teeth, and the gear teeth on the motor gear are meshed with the gear teeth on the nut of the screw nut pair; the push rod unit is arranged outside the pen cartridge housing.

[0005] The insulin injection pen in the prior art uses a motor as a power source to inject liquid medicine, which has a complex structure and high cost, and there is room for improvement. Utility Model Content

[0006] In view of the defects in the prior art, the purpose of the utility model is to provide a piston driving device and a drug delivery device for a continuous micro-dosing device.

[0007] According to the utility model, a piston driving device for a continuous micro-dosing device is provided, comprising a shell, on which a force storage device and a force storage release device are arranged; one end of the force storage device is connected to the piston body, and the other end of the force storage device is connected to the shell, and the force storage device is in a force storage state; the force storage release device comprises a transmission terminal gear rotatably arranged on the shell, a winding wheel is arranged on the transmission terminal gear, a pulling wire is wound on the winding wheel, and the pulling wire extends to the piston body along the release direction of the force of the force storage device through one end of the force storage device away from the piston body and is connected to the piston body.

[0008] Preferably, the force storage device comprises an elastic member, the expansion and contraction direction of the elastic member is the release direction of the force of the force storage device, and the expansion and contraction direction of the elastic member is in the same direction as the movement direction of the piston body.

[0009] Preferably, the winding wheel is coaxially and fixedly connected to the transmission end gear.

[0010] Preferably, the transmission gear is arranged on one radial side of the force storage device, and a guide column is arranged on the shell, and the guide column is located on the side of the force storage device away from the piston body; the pull wire first bypasses the guide column and then extends to the piston body along the force release direction of the force storage device through the end of the force storage device away from the piston body and is connected to the piston body.

[0011] Preferably, the pull wire passes coaxially through the force storage device.

[0012] Preferably, the force storage release device comprises a driving assembly and a gear set, and the driving assembly drives the transmission terminal gear to rotate or position through the gear set.

[0013] Preferably, the gear set comprises a transmission start end gear, a transmission end gear and an intermediate transmission gear, the transmission start end gear is transmission-connected to the driving assembly, and the intermediate transmission gear is transmission-connected to the transmission start end gear and the transmission end gear.

[0014] Preferably, any of the transmission starting end gear, the transmission end gear and the intermediate transmission gear are rotatably connected to the housing via a rotating shaft.

[0015] Preferably, the drive assembly outputs torque, and the drive assembly includes an electromagnetic drive.

[0016] According to a drug delivery device provided by the utility model, it also includes a drug storage device and a needle device, the piston body extends into the drug storage device, and the drug storage device is connected with the needle device.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model releases a certain length of the pull wire by rotating the transmission terminal gear of the force storage release device by a certain angle. Under the action of the force storage device, the piston body can move a certain length into the medicine storage device, thereby realizing quantitative injection of the medicine liquid. The utility model has a simple structure and low cost.

[0019] 2. The utility model uses an electromagnetically driven driving assembly as the power source of the force storage release device, and with the help of a gear set, the tiny force of the electromagnetically driven driving assembly can be used to control the larger force of the force storage device, which helps to reduce costs.

[0020] 3. The utility model helps to improve the stability of injection by passing the pull wire through the middle of the compression spring coaxially. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0022] Figure 1 This is a schematic diagram of the overall structure of the piston drive device mainly embodied in the utility model;

[0023] Figure 2 This is an exploded view of the overall structure of the driving component of the utility model;

[0024] Figure 3 This is a cross-sectional view mainly showing the overall structure of the drive assembly of the present invention.

[0025] Reference numerals:

[0026] Fixed coil 111 Transmission end gear 123

[0027] Permanent magnet 112 Winding wheel 124

[0028] Output gear 113 Pull wire 125

[0029] Magnetic sheet 114 Guide column 127

[0030] Limit hole 115 Compression spring 21

[0031] Gear set 121 Piston body 31

[0032] Transmission start end gear 122 DETAILED DESCRIPTION

[0033] The utility model is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the utility model, but do not limit the utility model in any form. It should be pointed out that for those of ordinary skill in the art, several changes and improvements can be made without departing from the concept of the utility model. These all belong to the protection scope of the utility model.

[0034] like Figure 1 , Figure 2 as well as Figure 3 As shown, a piston driving device for a continuous micro-dosing device provided by the utility model includes a housing, a force storage device and a force storage release device are arranged on the housing, one end of the force storage device is connected to the piston body 31, and the other end of the force storage device is connected to the housing, and the force storage device is in a force storage state. The force storage release device includes a transmission terminal gear 123 rotatably arranged on the housing, a winding wheel 124 is arranged on the transmission terminal gear 123, a pull wire 125 is wound on the winding wheel 124, and the pull wire 125 extends to the piston body 31 along the release direction of the force storage device through one end of the force storage device away from the piston body 31 and is connected to the piston body 31.

[0035] Specifically, the housing is the installation base of the device on the injection device and has a certain structural strength. The force storage release device includes a driving component and a gear set 121. The driving component drives the transmission end gear 123 to rotate or position through the gear set 121. The driving component can be electrically connected to the circuit board. The driving component controls the stroke of the piston body 31 through the gear set. The force storage device outputs a linear thrust to the piston body 31.

[0036] More specifically, the drive assembly outputs torque, and the drive assembly includes an electromagnetic drive. The technical solution of the present application provides a feasible implementation method: the drive assembly includes a fixed coil 111 and a rotatably arranged permanent magnet 112, the permanent magnet 112 is radially magnetized, and the magnetic field generated by the fixed coil 111 interacts with the radial magnetic field of the permanent magnet 112 to drive the permanent magnet 112 to rotate or position, and an output gear 113 is fixedly arranged on the permanent magnet 112. The fixed coil 111 includes a coil and a fixed bracket, the coil is wound on the fixed bracket, and the fixed bracket is fixedly mounted on the shell by fasteners. A magnetic conductive sheet 114 is also fixedly mounted on the shell by fasteners, and a limiting hole 115 is arranged on the magnetic conductive sheet 114 to allow the permanent magnet 112 to rotate and position. The shape of the permanent magnet 112 is cylindrical, and the cylindrical permanent magnet 112 is placed in the limiting hole 115 and is rotatably mounted on the shell through a coaxially arranged rotating shaft. The magnetic sheet 114 can be used to generate a magnetic field in an alternating direction. The magnetic field generated by the fixed coil 111 can interact with the magnetic field of the permanent magnet 112 to rotate the permanent magnet 112 by a certain angle, especially 180 degrees. The output gear 113 is coaxially fixedly mounted on the permanent magnet 112, and the rotation of the permanent magnet 112 can drive the output gear 113 to rotate.

[0037] It should be noted that the drive component of the present application may also be a magneto-electric brake, an electromagnetic swing fork or an electromagnetic ring etc. that can output torque in the prior art.

[0038] A circuit board is also provided on the shell, and a communication module, a data processing module, a data storage module and a signal conversion module are integrated on the circuit board. The signal conversion module and the communication module are electrically connected, and the circuit board is electrically connected to the fixed coil 111. The communication module of the circuit board can receive external wired or wireless infusion command signals or infusion programs. According to the received infusion information, the data processing module can automatically control the signal conversion module to generate corresponding electric pulse signals as required. The electric pulse signals are transmitted to the fixed coil 111 to control the permanent magnet 112 to rotate a certain angle, thereby realizing the control of the output gear 113 to rotate a certain angle.

[0039] The gear set 121 includes a plurality of meshing gear structures, and any gear of the gear set 121 is rotatably connected to the housing through a rotating shaft, and the gear set 121 includes at least one transmission start end gear 122 and at least one transmission end gear 123, and the output gear 113 is meshed with the transmission start end gear 122 of the gear set 121. At least one intermediate transmission gear is arranged between the transmission start end gear 122 and the transmission end gear 123, and the intermediate transmission gear is respectively meshed with the transmission start end gear 122 and another intermediate transmission gear, or is respectively meshed with the transmission end gear 123 and another intermediate transmission gear, or is respectively meshed with the other two intermediate transmission gears.

[0040] The force storage device includes an elastic part, which is in a compressed state. The elastic part of the present application outputs a linear thrust and can be an elastic device capable of storing potential energy, such as a compression spring 21, a rubber band, a compressed air spring, etc. in the prior art. The elastic part of the embodiment of the present application is preferably a compression spring 21.

[0041] A winding wheel 124 is coaxially arranged on the transmission end gear 123 of the gear set 121, and a pull wire 125 is wound on the winding wheel 124. The pull wire 125 extends to the piston push rod device 3 along the expansion and contraction direction of the compression spring 21 through the end of the compression spring 21 away from the piston push rod device 3 and is connected to the piston push rod device 3. The gear set 121 can convert the rotation angle of the output gear 113 into the linear motion stroke of the pull wire 125 at a certain ratio. When the liquid medicine needs to be injected, the user can send a specific infusion instruction to the circuit board. After receiving the specific infusion instruction, the circuit board sends a corresponding electric pulse signal to the fixed coil 111, so that the permanent magnet 112 and the output gear 113 rotate a certain angle. The output gear 113 releases a certain length of the pull wire 125 through the gear set 121 to realize the release of the specified piston stroke. At this time, the specified piston stroke is the same as the length of the released pull wire 125.

[0042] Furthermore, the gear set 121 is arranged on one radial side of the compression spring 21, and a guide column 127 is arranged on the shell body. The guide column 127 is arranged on the side of the compression spring 21 away from the piston push rod device 3. The pull wire 125 on the take-up wheel first bypasses the guide column 127 and then extends through the end of the compression spring 21 away from the piston push rod device 3 along the telescopic direction of the compression spring 21 to the piston push rod device 3 and is connected to the piston push rod device 3, and the pull wire 125 passes coaxially from the middle of the compression spring 21.

[0043] With the help of the gear set 121, the tiny force of the electromagnetically driven driving assembly can be used to control the larger force of the force storage device. Under the condition of meeting the clinical needs equally, compared with the servo motor and memory alloy, the cost of the technical solution of the present application is greatly reduced, and the required power consumption is also one tenth or even one hundredth, which can greatly reduce the cost of patients to purchase medical equipment and reduce battery consumption and pollution.

[0044] The utility model also provides a drug delivery device, which adopts the above-mentioned piston drive system for continuous micro-dosing device, and also includes a drug storage device and a needle device, wherein the piston body 31 extends into the drug storage device, and the drug storage device is connected with the needle device. The piston body 31 extends into the drug storage device and is slidably connected with the inner wall of the drug storage device, and a dynamic seal is provided between the piston body 31 and the inner wall of the drug storage device, so as to prevent the drug liquid from leaking out from the connection between the piston body 31 and the inner wall of the drug storage device. The movement direction of the piston body 31 in the drug storage device is parallel to the expansion and contraction direction of the compression spring 21, and the compression spring 21 is connected or crimped with the piston body 31. Since the compression spring 21 is in a compressed state, it stores sufficient elastic potential energy. When the gear set 121 releases a certain length of the pull wire 125, under the action of the compression spring 21, the piston body 31 can move a certain length into the drug storage device. It should be noted that the cross-sectional area of ​​the cavity of the medicine storage device can be determined during processing. When the piston body 31 moves a certain length into the medicine storage device, the volume of the medicine liquid discharged when the piston body 31 moves a certain length in the medicine storage device can be calculated, thereby realizing quantitative infusion of the medicine liquid, which helps to improve the accuracy of the medicine liquid infusion.

[0045] In the description of the present application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0046] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which does not affect the essence of the present invention. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other at will.

Claims

1. A piston drive device for a continuous micro-dosing device, characterized in that: It comprises a shell, on which a force storage device and a force storage release device are arranged; One end of the force storage device is connected to the piston body (31), the other end of the force storage device is connected to the housing, and the force storage device is in a force storage state; The force storage release device comprises a transmission end gear (123) rotatably arranged on a housing, a winding wheel (124) being arranged on the transmission end gear (123), a pulling wire (125) being wound around the winding wheel (124), and the pulling wire (125) extending from one end of the force storage device away from the piston body (31) along the release direction of the force of the force storage device to the piston body (31) and being connected to the piston body (31).

2. The piston drive device for a continuous micro-dosing device according to claim 1, characterized in that: The force storage device comprises an elastic member, the expansion and contraction direction of the elastic member is the release direction of the force of the force storage device, and the expansion and contraction direction of the elastic member is in the same direction as the movement direction of the piston body (31).

3. The piston drive device for a continuous micro-dosing device according to claim 1, characterized in that: The winding wheel (124) is coaxially and fixedly connected to the transmission end gear (123).

4. The piston drive device for a continuous micro-dosing device according to claim 1, characterized in that: The transmission final gear (123) is arranged on one side of the force storage device in the radial direction, and a guide column (127) is arranged on the housing, and the guide column (127) is located on a side of the force storage device away from the piston body (31); The pull wire (125) first passes around the guide column (127) and then extends to the piston body (31) along the force release direction of the force storage device through one end of the force storage device away from the piston body (31) and is connected to the piston body (31).

5. The piston drive device for a continuous micro-dosing device according to claim 4, characterized in that: The pull wire (125) coaxially passes through the force storage device.

6. The piston drive device for a continuous micro-dosing device according to claim 1, characterized in that: The force storage release device comprises a driving component and a gear set (121), and the driving component drives the transmission terminal gear (123) to rotate or position through the gear set (121).

7. The piston drive device for a continuous micro-dosing device according to claim 6, characterized in that: The gear set (121) comprises a transmission start end gear (122), a transmission end gear (123) and an intermediate transmission gear; the transmission start end gear (122) is transmission-connected to the drive assembly; and the intermediate transmission gear is transmission-connected to the transmission start end gear (122) and the transmission end gear (123).

8. The piston drive device for a continuous micro-dosing device according to claim 7, characterized in that: Any of the transmission starting end gear (122), the transmission end gear (123) and the intermediate transmission gear are rotatably connected to the housing via a rotating shaft.

9. The piston drive device for a continuous micro-dosing device according to claim 7, characterized in that: The drive assembly outputs torque, and the drive assembly includes an electromagnetic drive.

10. A drug delivery device, characterized in that: The piston drive device for a continuous micro-dosing device according to any one of claims 1 to 9 further comprises a drug storage device and a needle device, wherein the piston body (31) extends into the drug storage device, and the drug storage device is connected to the needle device.

Images