Piston movement system for continuous micro-dosing device and dosing device

Abstract

The utility model provides a piston motion system for a continuous micro-dosing device and a dosing device. The piston motion system comprises a shell, and a piston push rod device, a force storage device and a stored force release device are arranged on the shell; the piston push rod device comprises a piston body, a lead screw, a sleeve assembly and a worm gear, one end of the lead screw is fixedly connected with the piston body, the other end of the lead screw extends into the sleeve assembly and is in threaded connection with the inner wall of the sleeve assembly, and the worm gear is fixedly connected with the outer wall of the sleeve assembly; the force storage device outputs rotating torque to the piston push rod device, the stored force releasing device comprises a worm, and the worm gear is meshed with the worm. The force storage device serves as a power source, the stored force release device releases the stroke of the piston push rod device through cooperation of the worm and the worm gear, the force storage device pushes the piston push rod device to move by a certain length into the medicine storage device in a torque rotating mode, 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, in particular to a piston motion system for a continuous micro-dosing device and a dosing 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 motion system and a drug delivery device for a continuous micro-dosing device.

[0007] According to the utility model, a piston movement system for a continuous micro-dosing device is provided, including a shell, on which a piston push rod device, a force storage device and a force storage release device are arranged; the piston push rod device includes a piston body, a screw rod, a sleeve assembly and a worm gear, one end of the screw rod is fixedly connected to the piston body, the other end of the screw rod extends into the sleeve assembly and is threadedly connected to the inner wall of the sleeve assembly, and the worm gear is fixedly connected to the outer wall of the sleeve assembly; the force storage device outputs a rotational torque to the piston push rod device, and the force storage release device includes a worm, and the worm gear is meshed with the worm.

[0008] Preferably, the force storage device comprises a first torsion spring, one end of the first torsion spring is fixedly connected to the sleeve assembly, the other end of the first torsion spring is fixedly connected to the housing, and the first torsion spring is in a compressed state.

[0009] Preferably, the sleeve assembly includes a screw sleeve, a worm gear sleeve and a locking assembly, the screw sleeve extends into the worm gear sleeve, and the outer wall of the screw sleeve and the inner wall of the worm gear sleeve slide together along the axial direction of the sleeve assembly; the locking assembly fixedly connects the screw sleeve and the worm gear sleeve, the screw extends into the screw sleeve, and the worm gear is arranged on the outer wall of the worm gear sleeve.

[0010] Preferably, the locking assembly includes a locking steel ball and a locking slot, the locking slot is relatively fixedly connected to the worm gear sleeve, the screw sleeve passes through the locking slot and extends into the worm gear sleeve; the locking steel ball is arranged on the outer surface of the screw sleeve, and a receiving groove with a gradually decreasing diameter is arranged on the side of the locking slot close to the locking steel ball, and the locking steel ball is embedded in the receiving groove.

[0011] Preferably, the cross-section of the receiving groove is V-shaped.

[0012] Preferably, one or more locking steel balls are arranged at equal intervals around the central axis of the screw sleeve on the circumference of the screw sleeve.

[0013] Preferably, the force storage release device comprises a rotating magnetic brake assembly and a coupling assembly, and the rotating magnetic brake assembly is coupled to the piston push rod device via the coupling assembly.

[0014] Preferably, the rotating magnetic brake assembly comprises a fixed coil and a rotatably arranged permanent magnet, the permanent magnet is radially magnetized, the magnetic field generated by the fixed coil interacts with the radial magnetic field of the permanent magnet to drive the permanent magnet to rotate or position, and an output gear is fixedly arranged on the permanent magnet.

[0015] Preferably, the coupling assembly comprises a gear set, the output gear is meshed with the transmission starting end gear of the gear set, and the transmission end gear of the gear set is coaxially fixedly connected with the worm.

[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 push rod device 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 uses a force storage device as a power source, and the force storage release device releases the stroke of the piston push rod device with the help of the cooperation of the worm and the worm wheel. The force storage device pushes the piston push rod device to move a certain length into the medicine storage device by means of a rotational torque, thereby realizing quantitative injection of the medicine liquid. The structure is simple and the cost is low.

[0019] 2. The utility model injects liquid medicine into the medicine storage device. At this time, the piston body will move backward with the injection of liquid medicine. The screw and screw sleeve connected to the piston body need to slide freely backward in the worm sleeve. When the injection begins, the worm sleeve and the screw sleeve must be locked and cannot slide freely. Only then can the screw push the piston body forward to inject liquid medicine, thereby realizing the injection of medicine into the medicine storage device and quantitative injection.

[0020] 3. The utility model allows the locking steel ball to enter the locking groove for a certain distance and when the gap is smaller than the diameter of the locking steel ball, the locking steel ball, the locking groove and the screw sleeve are locked to each other, and the screw sleeve and the worm gear sleeve are locked to each other. 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 drug delivery device mainly embodied in the utility model;

[0023] Figure 2 This is an exploded view of the overall structure of the rotary magnetic brake assembly of the utility model;

[0024] Figure 3 This is a cross-sectional view of the overall structure of the rotary magnetic brake assembly of the utility model;

[0025] Figure 4 This is an exploded schematic diagram mainly showing the overall structure of the piston motion system of the utility model;

[0026] Figure 5 This is an exploded schematic diagram mainly showing the overall structure of the locking assembly of the utility model;

[0027] Figure 6 This is a cross-sectional view mainly showing the overall structure of the piston push rod device of the present utility model.

[0028] Reference numerals:

[0029] Accumulated force release device 1 Piston push rod device 3

[0030] Rotating magnetic brake assembly 11 piston body 31

[0031] Fixed coil 111 Locking steel ball 351

[0032] Permanent magnet 112 Locking slot 352

[0033] Output gear 113 Accommodating groove 353

[0034] Magnetic sheet 114 Locking trigger spring 354

[0035] Limit hole 115 Guide rod 36

[0036] Coupling assembly 12 Drug storage device 4

[0037] Gear set 121 Control device 6

[0038] Transmission start end gear 122 Circuit board 61

[0039] Transmission final gear 123 Housing 8

[0040] Worm 126 Sleeve lock signal switch 81

[0041] Accumulator 2 Guide seat 82

[0042] First torsion spring 22 DETAILED DESCRIPTION

[0043] 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.

[0044] like Figure 1 As shown, a piston motion system for a continuous micro-dosing device provided by the utility model includes a housing, on which a piston push rod device, a force storage device and a force storage release device are arranged. The piston push rod device includes a piston body, a screw, a sleeve assembly and a worm gear, one end of the screw is fixedly connected to the piston body, the other end of the screw extends into the sleeve assembly and is threadedly connected to the inner wall of the sleeve assembly, and the worm gear is fixedly connected to the outer wall of the sleeve assembly. The force storage device outputs a rotational torque to the piston push rod device, and the force storage release device includes a worm, and the worm gear is meshed with the worm.

[0045] The housing 8 is the installation base of the device on the injection device and has a certain structural strength. The power storage release device 1 includes a rotating magnetic brake assembly 11 and a coupling assembly 12. The rotating magnetic brake assembly 11 is electrically connected to the control device 6. The rotating magnetic brake assembly 11 controls the piston stroke of the piston push rod device 3 through the coupling assembly 12. The power storage device 2 outputs a linear thrust to the piston push rod device 3.

[0046] like Figure 1 , Figure 2 , Figure 3 As shown, more specifically, the rotary magnetic brake assembly 11 includes a fixed coil 111 and a rotatably arranged permanent magnet 112, the permanent magnet 112 is radially magnetized, 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, the fixed bracket is fixedly mounted on the housing 8 by fasteners, and a magnetic conductive sheet 114 is also fixedly mounted on the housing 8 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 permanent magnet 112 is cylindrical in shape, the cylindrical permanent magnet 112 is placed in the limiting hole 115 and is rotatably mounted on the housing 8 by 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.

[0047] It should be noted that the rotary magnetic brake assembly 11 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.

[0048] The control device 6 includes a circuit board 61, on which a communication module, a data processing module, a data storage module and a signal conversion module are integrated. The signal conversion module and the communication module are electrically connected, and the circuit board 61 is electrically connected to the fixed coil 111. The communication module of the control device 6 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.

[0049] like Figure 4 , Figure 5 as well as Figure 6As shown, the coupling assembly 12 includes a gear set 121, and the gear set 121 includes a plurality of meshing gear structures. Any gear of the gear set 121 is rotatably connected to the housing 8 via 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. The output gear 113 meshes with the transmission start end gear 122 of the gear set 121, and a worm 126 is provided on the transmission end gear 123 of the gear set 121. At least one intermediate transmission gear is provided 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.

[0050] The force storage device 2 outputs a rotational torque, and the force storage device 2 includes a first torsion spring 22, and the first torsion spring 22 is in a compressed state. The piston push rod device 3 includes a piston body 31, a screw rod 32, a sleeve assembly 34 and a worm gear 33. The piston body 31 is arranged in the medicine storage device 4, one end of the screw rod 32 is fixedly connected to the piston body 31, the other end of the screw rod 32 extends into the sleeve assembly 34 and is threadedly connected to the inner wall of the sleeve assembly 34, the worm gear 33 is fixedly connected to the outer wall of the sleeve assembly 34, and the worm gear 33 is meshed with the worm 126. One end of the first torsion spring 22 is fixedly connected to the sleeve assembly 34, and the other end of the first torsion spring 22 is fixedly connected to the housing 8 of the injection device.

[0051] Further, the sleeve assembly 34 includes a screw sleeve 341, a worm gear sleeve 342 and a locking assembly 35. The screw sleeve 341 extends into the worm gear sleeve 342, and the outer wall of the screw sleeve 341 and the inner wall of the worm gear sleeve 342 are slidably matched along the axial direction of the sleeve assembly 34. The locking assembly 35 fixedly connects the screw sleeve 341 and the worm gear sleeve 342. Before the locking assembly 35 fixedly connects the screw sleeve 341 and the worm gear sleeve 342, the screw sleeve 341 can slide on the worm gear sleeve 342 along the axis of the sleeve assembly 34. After the locking assembly 35 fixedly connects the screw sleeve 341 and the worm gear sleeve 342, the screw sleeve 341 and the worm gear sleeve 342 do not generate relative movement.

[0052] The locking assembly 35 includes a locking steel ball 351 and a locking slot 352. The locking slot 352 is relatively fixedly connected to the worm gear sleeve 342. The screw sleeve 341 passes through the locking slot 352 and extends into the worm gear sleeve 342. The locking steel ball 351 is arranged on the outer surface of the screw sleeve 341. The locking slot 352 is provided with a gradually decreasing diameter receiving slot 353 on one side close to the locking steel ball 351. The locking steel ball 351 is embedded and matched with the receiving slot 353. The receiving slot 353 is formed by the inner wall of the locking slot 352 and the outer wall of the screw sleeve 341, and the cross-sectional shape of the receiving slot 353 is approximately "V"-shaped. When the locking steel ball 351 enters the locking slot 352 for a certain distance and reaches a gap smaller than the diameter of the locking steel ball 351, the locking steel ball 351, the locking slot 352 and the screw sleeve 341 are mutually locked, and the screw sleeve 341 and the worm gear sleeve 342 are mutually locked.

[0053] Furthermore, a locking trigger spring 354 is coaxially sleeved on the screw sleeve 341, and the locking trigger spring 354 is arranged on the side of the locking steel ball 351 away from the locking slot 352, and a semicircular groove is arranged on the locking trigger spring 354 to fit with the locking steel ball 351. One or more locking steel balls 351 are arranged at equal intervals around the central axis of the screw sleeve 341 on the circumference of the screw sleeve 341, and the semicircular groove on the locking trigger spring 354 is arranged corresponding to the locking steel ball 351. The housing 8 is provided with a sleeve locking signal switch 81.

[0054] Before use, there is no medicine in the medicine storage device 4, and the user needs to use a syringe to inject the medicine into the medicine storage device 4. At this time, the piston body 31 will move backward with the injection of the medicine, and the screw 32 and the screw sleeve 341 connected to the piston body 31 need to slide freely backward in the worm gear sleeve 342. When the injection starts, the worm gear sleeve 342 and the screw sleeve 341 must be locked and cannot slide freely. Only then can the screw 32 push the piston body 31 forward to inject the medicine.

[0055] When the turbine starts to rotate during injection, the locking trigger spring 354 rotates with the turbine. When the locking signal switch 81 of the sleeve cannot block the locking trigger spring 354, the locking trigger spring 354 pushes the locking steel ball 351 into the locking slot 352. The gap between the locking slot 352 and the screw sleeve 341 is V-shaped. The gap between the locking steel ball 351 and the screw sleeve 341 is smaller as it goes into the locking slot 352. When the locking steel ball 351 enters the locking slot 352 for a certain distance and reaches a point where the gap is smaller than the diameter of the locking steel ball 351, the locking steel ball 351, the locking slot 352 and the screw sleeve 341 are locked together, and the screw sleeve 341 is locked with the worm gear sleeve 342. This solves the problem that the worm gear sleeve 342 and the screw sleeve 341 need to slide freely when filling medicine and are locked with each other when injecting.

[0056] Furthermore, a guide rod 36 is fixedly provided on the piston body 31 , and the length direction of the guide rod 36 is parallel to the length direction of the screw rod 32 . A guide seat 82 is provided on the housing 8 , and the guide rod 36 horizontally passes through the guide seat 82 and slides therewith.

[0057] The utility model provides a piston motion system for a continuous micro-dosing device and a dosing device, which also includes a drug storage device 4 and a needle device 5. The piston body 31 extends into the drug storage device 4, and the drug storage device 4 is connected to the needle device 5.

[0058] 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 referred device or element 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.

[0059] 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 motion system for a continuous microdosing device, characterized in that: It comprises a housing (8), on which a piston push rod device (3), a force storage device (2) and a force storage release device (1) are arranged; The piston push rod device (3) comprises a piston body (31), a screw rod (32), a sleeve assembly (34) and a worm gear (33); one end of the screw rod (32) is fixedly connected to the piston body (31); the other end of the screw rod (32) extends into the sleeve assembly (34) and is threadedly connected to the inner wall of the sleeve assembly (34); and the worm gear (33) is fixedly connected to the outer wall of the sleeve assembly (34); The force storage device (2) outputs a rotational torque to the piston push rod device (3), the force storage release device (1) comprises a worm (126), and the worm wheel (33) meshes with the worm (126).

2. The piston motion system for a continuous micro-dosing device according to claim 1, characterized in that: The force storage device (2) comprises a first torsion spring (22), one end of the first torsion spring (22) is fixedly connected to the sleeve assembly (34), the other end of the first torsion spring (22) is fixedly connected to the housing (8), and the first torsion spring (22) is in a compressed state.

3. The piston motion system for a continuous micro-dosing device according to claim 1, characterized in that: The sleeve assembly (34) comprises a screw sleeve (341), a worm gear sleeve (342) and a locking assembly (35); the screw sleeve (341) extends into the worm gear sleeve (342), and the outer wall of the screw sleeve (341) and the inner wall of the worm gear sleeve (342) are slidably matched along the axial direction of the sleeve assembly (34); The locking assembly (35) fixedly connects the screw sleeve (341) and the worm gear sleeve (342); the screw (32) extends into the screw sleeve (341); and the worm gear (33) is arranged on the outer wall of the worm gear sleeve (342).

4. The piston motion system for a continuous micro-dosing device according to claim 3, characterized in that: The locking assembly (35) comprises a locking steel ball (351) and a locking slot (352), the locking slot (352) being relatively fixedly connected to the worm gear sleeve (342), and the screw sleeve (341) passes through the locking slot (352) and extends into the worm gear sleeve (342); The locking steel ball (351) is arranged on the outer surface of the screw sleeve (341), and a receiving groove (353) with a gradually decreasing diameter is arranged on the side of the locking slot (352) close to the locking steel ball (351), and the locking steel ball (351) is embedded and matched with the receiving groove (353).

5. The piston motion system for a continuous micro-dosing device according to claim 4, characterized in that: The cross-sectional shape of the containing groove (353) is "V"-shaped.

6. The piston motion system for a continuous micro-dosing device according to claim 4, characterized in that: One or more locking steel balls (351) are arranged at equal intervals around the central axis of the screw sleeve (341) on the circumference of the screw sleeve (341).

7. The piston motion system for a continuous micro-dosing device according to claim 1, characterized in that: The force storage release device (1) comprises a rotating magnetic brake component (11) and a coupling component (12); the rotating magnetic brake component (11) is coupled to the piston push rod device (3) via the coupling component (12).

8. The piston motion system for a continuous micro-dosing device according to claim 7, characterized in that: The rotary magnetic brake assembly (11) comprises a fixed coil (111) and a rotatably arranged permanent magnet (112); the permanent magnet (112) is radially magnetized; 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).

9. The piston motion system for a continuous micro-dosing device according to claim 8, characterized in that: The coupling assembly (12) comprises a gear set (121), the output gear (113) meshes with a transmission start-end gear (122) of the gear set (121), and the transmission end gear (123) of the gear set (121) is coaxially fixedly connected to a worm (126).

10. A drug delivery device, characterized in that: The piston motion system for a continuous micro-dosing device according to any one of claims 1 to 9 also includes a drug storage device (4) and a needle device (5), wherein the piston push rod device (3) extends into the drug storage device (4), and the drug storage device (4) is connected to the needle device (5).

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