CN116688293A

CN116688293A - Driving mechanism, driving method, automatic injection device and injection method

Info

Publication number: CN116688293A
Application number: CN202310671372.6A
Authority: CN
Inventors: 赵剑; 刘孝永; 左鹏
Original assignee: Suzhou Hengrui Hongyuan Medical Technology Co ltd
Current assignee: Suzhou Hengrui Hongyuan Medical Technology Co ltd
Priority date: 2023-06-07
Filing date: 2023-06-07
Publication date: 2023-09-05

Abstract

The application discloses a driving mechanism, a driving method, an automatic injection device and an injection method. The driving mechanism comprises a push rod, a guide tube, a release sleeve and a rotor; the guide tube is coaxially provided with a push rod, and is provided with an elastic arm and a first opening; the release sleeve is coaxially nested on the outer wall of the guide tube, and a second opening and a first elastic clamping hook are arranged on the release sleeve; the rotor is nested on the outer wall of the release sleeve and used for limiting the radial movement of the first elastic clamping hook, a third opening is formed in the rotor and used for popping up the first elastic clamping hook towards the third opening when the first elastic clamping hook crosses the first opening and when the first elastic clamping hook moves to a crossing position, and the guide tube is enabled to release the axial limit of the release sleeve; the second opening reaches the position of the elastic arm, the elastic arm outwards flicks to release the axial limit of the push rod, and the push rod moves from the far end to the near end. Can realize the control start of multiple nodes and is used for improving the uniformity of medicine mixing during injection.

Description

Driving mechanism, driving method, automatic injection device and injection method

Technical Field

The application relates to the technical field of automatic injectors, in particular to a driving mechanism, a driving method, an automatic injection device and an injection method.

Background

At present, part of the injection medicines cannot be premixed and stored for a long time, so that the injection medicines are input into a human body. Because the agent is unstable, its efficacy is lost soon. Thus, users, such as the patient himself, medical personnel, have to mix for a limited time before a dose of the drug is delivered to the patient. This way of operation presents great inconvenience to the user. The existing automatic injection device cannot mix the medicines before injection; or when the medicines are mixed, the medicines are automatically injected without being uniformly mixed, and adverse effects are caused to a user; such that the user may have limited application of the medicament or a poor experience with the use of the automatic injection device.

Disclosure of Invention

The application provides a driving mechanism, a driving method, an automatic injection device and an injection method, wherein the driving mechanism structure can realize the work of a multi-node control driving mechanism, so that the driving mechanism is beneficial to the uniformity of medicine mixing when being applied to the injection device.

In order to solve the technical problems, the application adopts a technical scheme that: there is provided a drive mechanism for an injection device, the drive mechanism comprising: the device comprises a push rod, a guide tube, a release sleeve and a rotor; the guide tube is coaxially provided with an elastic arm and a first opening, and the elastic arm is used for limiting the axial movement of the push rod; the release sleeve is coaxially nested on the outer wall of the guide tube, a second opening and a first elastic clamping hook are arranged on the release sleeve, and the first elastic clamping hook is matched with the first opening of the guide tube so that the axial movement of the release sleeve is limited by the distal end surface of the first opening of the guide tube, wherein the proximal end is one end close to the injection end, and the distal end is one end far away from the injection end; the rotor is nested on the outer wall of the release sleeve and used for limiting the radial movement of the first elastic clamping hook, a third opening is formed in the rotor and used for popping up the first elastic clamping hook towards the third opening when the first elastic clamping hook crosses the first opening and when the first elastic clamping hook moves to a crossing position, and the guide tube is enabled to release the axial limit of the release sleeve; the second opening reaches the position of the elastic arm, the elastic arm outwards flicks to release the axial limit of the push rod, and the push rod moves from the far end to the near end.

The rotor comprises a second elastic clamping hook, a first boss is arranged at the proximal end of the guide tube, the second elastic clamping hook is matched with the first boss to limit the axial movement of the rotor and the first boss, and when the force applied to the release sleeve from the distal end to the proximal end is smaller than the preset force, the release sleeve and the rotor are relatively static.

The rotor inner wall is provided with a sliding groove extending along the axial direction, the outer wall of the release sleeve is provided with a first positioning protrusion extending along the axial direction, or the rotor inner wall is provided with a first positioning protrusion extending along the axial direction, and the outer wall of the release sleeve is provided with a sliding groove extending along the axial direction; the sliding groove and the first positioning protrusion are mutually embedded to limit the circumferential rotation of the rotor and the release sleeve.

Wherein the drive mechanism further comprises a housing and a release sleeve; the outer shell is sleeved on the periphery of the rotor, and the guide tube and the release sleeve are positioned in the outer shell; one end of the protective sleeve is inscribed on the proximal end of the outer shell.

Wherein, set up the installation on the stand pipe and collude, set up spacing mouth on the shell, the installation colludes with spacing mouthful lock to inject the axial and the circumference removal of stand pipe and shell.

When the protective sleeve is in threaded connection with the shell and moves towards the distal end relative to the shell, the protective sleeve can be abutted with the end face of the rotor and push the rotor to move towards the distal end axially, so that the third opening and the first opening of the rotor are intersected.

The driving mechanism further comprises a limiting ring which is buckled on the guide tube and used for limiting the position of the protective sleeve, which moves towards the distal end relative to the shell.

The circumferential limiting assembly is arranged on the guide tube and the release sleeve and used for limiting circumferential rotation of the guide tube and the release sleeve.

The outer wall of the push rod comprises a clamping part, and the clamping part and the elastic arm form an axial limiting assembly.

Wherein, the outer wall of the release sleeve is provided with a second boss, and the driving mechanism further comprises a first energy storage element; the first energy storage element is arranged on the periphery of the release sleeve in a surrounding mode, one end of the first energy storage element abuts against the distal end face of the rotor, and the other end of the first energy storage element abuts against the second boss so as to apply force to the rotor from the distal end to the proximal end.

The driving mechanism further comprises a second energy storage element, wherein the second energy storage element is used for giving acting force to the push rod, so that the push rod is separated from the guide tube when the second energy storage element is elastically restored.

The push rod is provided with a first inner hole with an opening at one end, one end of the first inner hole opposite to the opening is a first end face, the second energy storage element is arranged in the first inner hole, one end of the second energy storage element is propped against the first end face, and the other end of the second energy storage element is propped against the inner end face inside the guide tube.

The driving mechanism further comprises a guide piece, wherein the guide piece is arranged in the first inner hole, and the second energy storage element is sleeved on the guide piece to limit the second energy storage element to provide acting force along the axial direction.

The driving mechanism further comprises a sounding component, the sounding component comprises a sounding ring and a third energy storage element, the sounding ring and the third energy storage element are respectively nested with the push rod, the third energy storage element is used for providing kinetic energy for sounding to rotate around the axis of the push rod, and the sounding ring generates prompt tones in the motion process.

The application also includes a second technical scheme, a driving method of the driving mechanism, comprising the steps that the rotor receives axial acting force from the proximal end to the distal end, and the rotor moves axially to the distal end, so that a third opening of the rotor and a first opening of the guide tube form an intersection; the distal end of the release sleeve receives a force from the distal end to the proximal end, so that the release sleeve axially moves to the proximal end, the first elastic clamping hook of the release sleeve moves to an intersection, the first elastic clamping hook pops up towards the intersection, and the axial limit of the guide tube on the release sleeve is released; the second opening of the release sleeve reaches the position of the elastic arm, the elastic arm outwards flicks to release the axial limit of the push rod, and the push rod moves from the far end to the near end.

The driving mechanism further comprises a shell and a protective sleeve, wherein the shell is sleeved on the periphery of the rotor, and the guide tube and the release sleeve are positioned in the shell; one end of the protective sleeve is inscribed on the proximal end of the shell; the rotor receives axial force from the proximal end to the distal end, and the housing or/and the protective sleeve receives force, so that the protective sleeve moves distally relative to the housing, and the end face of the protective sleeve close to the distal end is abutted with the rotor, and the rotor is exerted with the axial force from the proximal end to the distal end.

The application also comprises a third technical scheme, an automatic injection device, a first automatic injection device and a second automatic injection device, wherein the automatic injection device comprises a medicine bearing assembly and the driving mechanism, the medicine bearing assembly comprises a medicine bearing, and the medicine bearing is enclosed into a containing cavity; the first piston and the second piston are sequentially arranged in the accommodating cavity, the second piston is positioned on one side of the first piston, which is close to the push rod, and the accommodating cavity is divided into a first accommodating cavity and a second accommodating cavity by the first piston; the medicine carrier axially moves from the proximal end to the distal end relative to the push rod, so that the push rod pushes the second piston to axially move to drive the first piston to synchronously move, and the first accommodating cavity is communicated with the second accommodating cavity.

The medicine carrier comprises an outer convex part, and in an initial state, the first piston is positioned at one side of the outer convex part facing to the far end; when the first piston moves to the outer protruding portion, a communication port is formed between the first piston and the inner wall of the medicine carrier, so that the first accommodating cavity or the second accommodating cavity is communicated.

The driving mechanism further comprises a shell, a protective sleeve and a baffle ring, wherein the shell is sleeved on the periphery of the rotor, and the guide tube and the release sleeve are positioned in the shell; one end of the protective sleeve is inscribed on the proximal end of the shell; the protective sleeve limits the axial movement of the medicine carrier through the baffle ring; the medicine carrier is fixed in the protection sleeve through the outer convex part, so that the axial movement of the protection sleeve drives the medicine carrier to move axially.

The application also comprises a fourth technical scheme, an automatic injection method, and the automatic injection device comprises the steps that the medicine carrier receives acting force from the proximal end to the distal end, and the medicine carrier axially moves relative to the push rod from the proximal end to the distal end, so that the push rod pushes the second piston to axially move, the first piston is driven to synchronously move, and the first accommodating cavity is communicated with the second accommodating cavity; the rotor receives axial force from the proximal end to the distal end, and the rotor moves axially to the distal end so that a third opening of the rotor and a first opening of the guide tube form an intersection; the distal end of the release sleeve receives a force from the distal end to the proximal end, so that the release sleeve moves axially to the proximal end, the first elastic clamping hook of the release sleeve moves to the intersection, the first elastic clamping hook of the release sleeve pops up towards the intersection, and the guide tube releases the axial limit of the release sleeve; the second opening of the release sleeve reaches the position of the elastic arm, the elastic arm outwards flicks to release the axial limit of the push rod, the push rod moves from the distal end to the proximal end, and the second piston is pushed to move from the distal end to the proximal end so as to complete injection.

The driving mechanism further comprises a shell and a protective sleeve, wherein the shell is sleeved on the periphery of the rotor, and the guide tube and the release sleeve are positioned in the shell; one end of the protective sleeve is inscribed on the proximal end of the shell; the drug carrier receives a proximal-to-distal force and the rotor receives a proximal-to-distal axial force, comprising: the outer shell or/and the protective sleeve receive an acting force, so that the protective sleeve moves distally relative to the outer shell and drives the medicine carrier to receive the acting force from the proximal end to the distal end; the end face of the protective sleeve close to the distal end is abutted against the rotor, and the rotor is imparted with axial force from the proximal end to the distal end.

The application has the beneficial effects that: unlike the prior art, the present application provides a drive mechanism for an automatic injection device, the drive mechanism comprising: push rod, guide tube, release sleeve and rotor. The guide tube is coaxially provided with an elastic arm and a first opening, and the elastic arm is used for limiting the axial movement of the push rod; the release sleeve is coaxially nested on the outer wall of the guide tube, and a first elastic clamping hook is arranged on the release sleeve; the rotor is nested in the outer wall of the release sleeve, and the inner wall of the rotor is used for limiting radial movement of the first elastic clamping hook, so that the rotor can be matched with the first opening of the guide tube, axial limiting of the first elastic clamping hook is limited, and the release sleeve is prevented from moving axially towards the distal end. According to the technical scheme, the rotor is provided with the third opening, the guide pipe is provided with the first opening, and when the third opening is intersected with the first opening and the first elastic clamping hook moves to the intersected position, the first elastic clamping hook pops out towards the third opening, so that the guide pipe hook releases the axial limit of the release sleeve; the second opening reaches the position of the elastic arm, the elastic arm outwards flicks, the axial limit of the push rod is relieved, the push rod moves from the far end to the near end, and the push rod is started. The application provides a driving mechanism, which is characterized in that a release sleeve is nested on the outer wall of a guide tube, a first elastic clamping hook is arranged on the release sleeve, and a rotor is nested on the outer wall of the release sleeve, so that the rotor and the guide tube cooperate to limit the first elastic clamping hook.

Drawings

FIG. 1 is a perspective cross-sectional view of an embodiment of a drive mechanism according to the present application in an initial state;

FIG. 2 is a schematic perspective view of a guide tube according to an embodiment of the driving mechanism of the present application;

FIG. 3 is a schematic perspective view of a release sleeve according to an embodiment of the driving mechanism of the present application;

FIG. 4 is a schematic perspective view of a rotor of an embodiment of a driving mechanism according to the present application;

FIG. 5 is an assembled view of a rotor and guide tube of an embodiment of a drive mechanism provided by the present application;

FIG. 6 is an overall exploded view of one embodiment of an automatic injection device provided by the present application;

FIG. 7 is a schematic overall view of an embodiment of an automatic injection device provided by the present application;

FIG. 8 is a schematic perspective view of a protection sleeve according to an embodiment of the driving mechanism provided by the present application;

FIG. 9 is a schematic perspective view of another embodiment of a driving mechanism according to the present application;

FIG. 10 is a schematic view in semi-section of an embodiment of an automatic injection device according to the present application in an initial state;

FIG. 11 is a schematic diagram of a driving method of an embodiment of a driving mechanism according to the present application;

FIG. 12 is a perspective cross-sectional view of an embodiment of a drive mechanism according to the present application in a hybrid configuration;

FIG. 13 is a perspective view of a drive mechanism according to an embodiment of the present application in a released state;

FIG. 14 is a schematic view in semi-section of an embodiment of an automatic injection device according to the present application in a fully mixed state;

FIG. 15 is a schematic perspective view of a medication carrier according to an embodiment of the automatic injection device provided by the present application;

FIG. 16 is a schematic perspective view of a retainer ring according to an embodiment of the driving mechanism of the present application;

FIG. 17 is a schematic illustration of an injection method of an embodiment of an automatic injection device provided by the present application;

FIG. 18 is a schematic view in semi-section of an embodiment of an automatic injection device according to the present application in a released state;

fig. 19 is a schematic view in semi-section of an embodiment of an automatic injection device according to the present application in a fully released state.

Detailed Description

The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The terms "first," "second," and "first," herein, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

In the embodiment of the application, the proximal end is the end near the injection end, i.e., the end near the needle of the automatic injection device, and the distal end is the end far from the injection end.

Referring to fig. 1, the present application provides a drive mechanism for an automatic injection device, the drive mechanism comprising a push rod 8, a guide tube 2, a release sleeve 10 and a rotor 4. The guide tube 2 is coaxially provided with a push rod 8, the guide tube 2 is provided with an elastic arm 204 and a first opening 210, and the elastic arm 204 is used for limiting the axial movement of the push rod 8; the release sleeve 10 is coaxially nested on the outer wall of the guide tube 2, the release sleeve 10 is provided with a second opening 1002 and a first elastic clamping hook 1001, and the first elastic clamping hook 1001 is used for being matched with the first opening 210, so that the distal end face of the first opening 210 of the guide tube 2 can prevent the release sleeve 10 from moving distally; the rotor 4 is nested on the outer wall of the release sleeve 10 and used for limiting the radial movement of the first elastic clamping hook 1001, the rotor 4 is provided with a third opening 401, and the third opening 401 is used for popping up the first elastic clamping hook 1001 towards the third opening 401 when the first elastic clamping hook 1001 crosses the first opening 210 and when the first elastic clamping hook 1001 moves to a crossing position, so that the guide tube 2 releases the axial limit of the release sleeve 10; the second opening 1002 reaches the position of the elastic arm 204, the elastic arm 204 bounces outwards to release the axial limit of the push rod 8, and the push rod 8 moves from the distal end to the proximal end.

In the embodiment of the application, the driving mechanism comprises a push rod 8, a guide tube 2, a release sleeve 10 and a rotor 4 which are coaxially nested. The guide tube 2 is provided with a resilient arm 204 and a first opening 210, the resilient arm 204 being able to limit the axial movement of the push rod 8; the release sleeve 10 is provided with a first elastic hook 1001, and the first elastic hook 1001 can be matched with the first opening 210, so that the axial movement of the release sleeve 10 is limited; the inner wall of the rotor 4 prevents the first elastic catching hook 1001 from being sprung outward so that the first elastic catching hook 1001 is engaged with the first opening 210, so that the guide tube 2 has an effect of preventing the release sleeve 10 from moving distally. In the technical scheme of the embodiment of the application, a third opening 401 is arranged on the rotor 4, a first opening 210 is arranged on the guide tube 2, and when the third opening 401 is intersected with the first opening 210 and the first elastic clamping hook 1001 moves to the intersected position, the first elastic clamping hook 1001 pops up towards the third opening 401, so that the guide tube 2 releases the axial limit of the release sleeve 10; the second opening 1002 reaches the position of the elastic arm 204, the elastic arm 204 springs outwards, the axial limit of the push rod 8 is released, the push rod 8 moves from the distal end to the proximal end, the push rod 8 is started, and the driving mechanism is started. According to the driving mechanism provided by the application, the first elastic clamping hook 1001 is arranged on the release sleeve 10, and the rotor 4 is nested on the outer wall of the release sleeve 10, so that the rotor 4 can play a limiting role on the first elastic clamping hook 1001.

Specifically, in the embodiment of the present application, the rotor 4 is nested on the outer wall of the release sleeve 10 to limit the circumferential movement of the release sleeve 10, and at the same time, to limit the axial position of the release sleeve 10 in the initial state.

Specifically, referring to fig. 1 and 2, the guide tube 2 has an inner cavity that can accommodate the push rod 8 while limiting the circumferential movement of the push rod 8. Specifically, in the embodiment of the present application, the elastic arm 204 is located at the distal end of the guide tube 2, and the first opening 210 is located at the proximal side of the elastic arm 204.

Referring to fig. 1, 3 and 9, the release sleeve 10 is coaxially nested on the outer wall of the guide tube 2 to limit the guide tube 2 so that the guide tube 2 can only move axially and cannot rotate circumferentially. The proximal end of the release sleeve 10 is provided with a first elastic hook 1001, and the second opening 1002 is at the distal end side of the first elastic hook 1001; the first elastic hook 1001 serves to limit the axial movement of the release sleeve 10 so that the release sleeve 10 does not move axially in the initial state.

Referring to fig. 1 and 4, a third opening 401 is provided at the proximal end of the rotor 4, and the third opening 401 is configured to cooperate with the first opening 210 of the guide tube 2 to release the restriction of the rotor 4 on the first elastic hook 1001, so that the driving mechanism is normally started.

Referring to fig. 1 and 5, in an embodiment of the present application, the rotor 4 further includes a second elastic hook 402 located at a proximal end of the rotor 4; the proximal end of the guide tube 2 is provided with a first boss 206, and the second resilient catch 402 cooperates with the first boss 206 to limit the axial movement of the rotor 4, thereby limiting the axial movement of the release sleeve 10, so that the release sleeve 10 is relatively stationary with respect to the rotor 4 when the release sleeve 10 is subjected to a force from distal to proximal that is less than a predetermined force. In the embodiment of the application, the second elastic clamping hook 402 is arranged on the rotor 4, so that the second elastic clamping hook is matched with the first boss 206 of the guide tube 2, thereby playing a role in safety and preventing the driving mechanism from being started due to false touch. The preset force in the embodiment of the application is a preset force for preventing false touch. That is, when the axial force generated by the false touch is smaller than the preset force, the second elastic hook 402 is overlapped on the first boss 206, and the two are matched with each other; in the case of a non-false touch, the driving mechanism needs to be started, and the acting force applied to the second elastic hook 402 is greater than the preset force, so that the second elastic hook 402 can pass over the first boss 206, and the second elastic hook 402 is disengaged from the first boss 206. When the driving mechanism provided by the embodiment of the application is used for an automatic injection device, when the automatic injection device or the driving mechanism falls to the ground or other external factors cause the release sleeve 10 to be subjected to external force from the distal end to the proximal end, the external force is smaller than the preset force, and the release sleeve 10 and the rotor 4 are relatively static, so that the driving mechanism is prevented from being started due to false touch. In the embodiment of the present application, the first boss 206 has an arc convex portion, and the arc convex portion is configured, so that the second elastic hook 402 can pass over the first boss 206 when the driving mechanism is started normally.

Referring to fig. 3 and 4, the inner wall of the rotor 4 is provided with a sliding groove 403 extending in the axial direction, and a first positioning protrusion 1006 extending in the axial direction is provided on the outer periphery of the release sleeve 10. The slide groove 403 and the first positioning boss 1006 are fitted to each other so that the rotor 4 can move only in the axial direction and cannot rotate in the circumferential direction. In the embodiment of the application, the first positioning protrusions 1006 are arranged in two rows, and the sliding grooves 403 are also arranged in two rows in an axisymmetric manner, and the two rows of sliding grooves 403 are respectively matched with the first positioning protrusions 1006, so that the rotor 4 can be well limited from rotating circumferentially relative to the release sleeve 10. In another embodiment of the application, it is also possible to provide the first positioning protrusion 1006 extending in the axial direction on the inner wall of the rotor 4, and the sliding groove 403 extending in the axial direction on the outer wall of the release sleeve 10. In other embodiments, the number of the first positioning protrusions 1006 may be one or more rows, the number of the sliding grooves 403 may be one or more rows, and the first positioning protrusions 1006 and the sliding grooves 403 may cooperate with each other to limit the circumferential rotation. Two or more rows of first positioning protrusions 1006 or sliding grooves 403 can be axisymmetrically arranged to improve stress uniformity; but may also be arranged non-axisymmetrically.

Referring to fig. 6 and 7, the driving mechanism in an embodiment of the present application further includes a housing 1 and a protection sleeve 11. The shell 1 is sleeved on the periphery of the rotor 4, and the guide tube 2 and the release sleeve 10 are positioned in the shell 1; one end of the protective sleeve 11 is inscribed in the proximal end of the housing 1.

Specifically, in the embodiment of the present application, the distal end of the protection sleeve 11 is inscribed in the proximal end of the housing 1, and the proximal end of the protection sleeve 11 is used for connecting with a needle of an injection pen, in one embodiment of the present application, the proximal end of the protection sleeve 11 is provided with a first thread 1104, and the first thread 1104 is used for screwing with the needle of the injection pen, so as to improve the stability of connection, thereby improving the safety and reliability of the driving mechanism, and in other embodiments, the connection can also be performed by other manners.

In the embodiment of the application, the casing 1 is sleeved on the periphery of the rotor 4, so that the guide tube 2 and the release sleeve 10 are positioned inside the casing 1, and the components of the rotor 4, the guide tube 2, the release sleeve 10, the guide tube 2 and the like are protected from external damage, for example, the driving mechanism is dropped on the ground by careless.

Referring to fig. 2 and 6, in an embodiment of the present application, an end surface of a first boss 206 of the guide tube 2 is provided with a mounting hook 207, and a housing 1 is correspondingly provided with a limiting opening, and the mounting hook 207 is buckled with the limiting opening, so as to limit circumferential rotation of the guide tube 2 and the housing 1, so that the driving mechanism is not twisted, and stability and safety of the driving mechanism are improved. Meanwhile, the mounting hook 207 is buckled with the limiting opening, so that the axial movement of the guide tube 2 and the shell 1 can be limited, and the guide tube 2 and the shell 1 are axially and relatively static. In another embodiment, the end surface of the first boss 206 may be set as a limiting opening, and the mounting hook 207 is correspondingly disposed on the housing 1; in other embodiments, other structures capable of corresponding snap-fitting may be provided, defining circumferential rotation and axial movement of the guide tube 2 and the housing 1.

Referring to fig. 7, 8 and 10, in the embodiment of the present application, the distal end of the protection sleeve 11 is provided with a second thread 1101, and the second thread 1101 is an external thread; the proximal end of the housing 1 is provided with an internal thread 101, the second thread 1101 is connected with the internal thread 101, and when the protective sleeve 11 moves distally relative to the housing 1, the protective sleeve can be abutted against the proximal end face of the rotor 4, so that the rotor 4 can not be pushed to move due to the reaction force of the rotor 4 while the rotor 4 is pushed to move axially distally, the third opening 401 of the rotor 4 is crossed with the first opening 210 of the guide tube 2, and the driving mechanism can be started normally. In other embodiments, the connection between the protection sleeve 11 and the housing 1 may be other, such that the protection sleeve 11 may push the rotor 4 to move axially distally, which is not limited herein.

Referring to fig. 6 and 14, the driving mechanism in the embodiment of the present application further includes a limiting ring 9, where the limiting ring 9 is buckled to the proximal end of the guide tube 2, so as to limit the position of the protecting sleeve 11 moving from the distal end to the proximal end, thereby protecting the normal operation of the driving mechanism and improving the reliability of the automatic injection device.

Referring to fig. 2 and 3, the driving mechanism in the embodiment of the application further includes a circumferential limiting component. The circumferential limiting assembly is arranged on the guide tube 2 and the release sleeve 10, and limits circumferential rotation of the guide tube 2 and the release sleeve 10. In an embodiment of the present application, the circumferential spacing assembly includes a second positioning protrusion 205 and a groove 1005, where the second positioning protrusion 205 is disposed on the outer periphery of the proximal end of the guide tube 2, and correspondingly, the release sleeve 10 is provided with a groove 1005, and the width of the groove 1005 is set to just accommodate the second positioning protrusion 205, and the second positioning protrusion 205 limits the circumferential movement of the groove 1005, so that the guide tube 2 and the release sleeve 10 can only move axially, and the normal operation of the driving mechanism is ensured. In other embodiments, the guide tube 2 may be provided as a groove, with a corresponding inward projection in the release sleeve 10, or the circumferential stop assembly may include other structures for limiting circumferential rotation of the guide tube 2 and release sleeve 10.

Referring to fig. 6, a locking portion is disposed on the push rod 8, and the locking portion cooperates with the elastic arm 204 to form an axial limiting assembly for limiting the axial movement of the push rod 8. In the embodiment of the application, the clamping part comprises an I-shaped table and a trapezoid table; in other embodiments, the engaging portion may have other shapes or structures.

Referring to fig. 4 and 9, the outer wall of the release sleeve 10 is provided with a second boss 1004, the second boss 1004 having a proximal face 1007. The driving mechanism in the embodiment of the application further comprises a first energy storage element 5, wherein the first energy storage element 5 is annularly arranged on the periphery of the release sleeve 10, one end of the first energy storage element is propped against the distal end face 404 of the rotor 4, and the other end of the first energy storage element is propped against the proximal end face 1007 of the second boss 1004, so that the driving mechanism gives a force to the distal end of the rotor 4 towards the proximal end, and the position of the rotor 4 can be at a preset position without any movement under different states, so that the driving mechanism has stronger stability.

Referring to fig. 6, the driving mechanism of the embodiment of the present application further includes a second energy storage element 7 for imparting a force to the push rod 8, so that the second energy storage element 7 disengages the push rod 8 from the guide tube 2 when the elasticity is recovered. In particular, the second energy accumulating element 7 can push the push rod 8 axially, releasing it from the axial constraint of the guide tube 2, when the drive mechanism is in operation.

In the embodiment of the present application, the push rod 8 is provided with a first inner hole (not shown) having an opening at one end, the end of the first inner hole facing away from the opening is a first end surface, the second energy storage element 7 is disposed in the first inner hole, one end of the second energy storage element abuts against the first end surface, the other end abuts against the end surface inside the guide tube 2, and when the driving mechanism is not started, the second energy storage element 7 is in a compressed state.

As shown in fig. 10, the driving mechanism according to the embodiment of the present application further includes a guide 201, where the guide 201 is disposed in the first inner hole. The second energy storage element 7 is sleeved on the guide piece 201, so that the second energy storage element 7 is limited to provide acting force along the axial direction, so that the second energy storage element 7 gives axial acting force to the push rod 8, and the push rod 8 is subjected to larger axial acting force.

Referring to fig. 2 and 6, the driving mechanism of the embodiment of the present application further includes a sound generating component. The sound generating assembly comprises a sound generating ring 6 and a third energy storage element 3. The sounding ring 6 and the third energy storage element 3 are respectively nested with the push rod 8, and the third energy storage element 3 is used for providing kinetic energy for the sounding ring 6 to rotate around the axis of the push rod 8; the guide tube 2 further comprises a first abutment surface 202, a second abutment surface (not shown), a sloping surface 203 and a terminating surface (not shown), the first abutment surface 202 being distal to the sloping surface 203, the second abutment surface being proximal to the sloping surface 203. When the driving mechanism is driven, the sounding ring 6 rotates under the action of the third energy storage element 3 in an energy storage state, and collides with the first abutting surface 202 to make a click sound, so that the patient is prompted to start injection. Along with the sounding ring 6 moving to the inclined plane, the sounding ring 6 is enabled to rotate by the inclined plane, the third energy storage element 3 in the energy storage state is driven to continue energy storage, when the sounding ring 6 reaches the second abutting surface, the energy storage of the third energy storage element 3 is finished, and the second abutting surface can prevent the sounding ring 6 from rotating. The push rod 8 continues to drive the sounding ring 6 to move, when the sounding ring 6 is separated from the second abutting surface, the rotation of the sounding ring 6 is not limited any more, the third energy storage element 3 in the energy storage state releases the stored torsion force to drive the sounding ring 6 to rotate, meanwhile, the sounding ring 6 falls on the termination surface with the height difference with the second abutting surface, the sounding ring 6 and the termination surface collide to give out a 'click' sound, namely a termination prompt tone, and the injector is prompted to accept the injection to be about to finish. According to the sounding assembly provided by the application, the third energy storage element 3 in the energy storage state provides kinetic energy for the rotation of the sounding ring 6, so that when the sounding ring 6 moves from the far end to the near end, the third energy storage element 3 in the energy storage state stores energy to drive the sounding ring 6 to rotate, and the sounding ring 6 collides with the first abutting surface 202 to generate an initial prompt tone when injection begins; the sound ring 6 collides with the stop surface to generate a stop prompt sound when the injection is about to be ended; effectively prevents the injection receiving person from misjudging the injection process in the injection process to cause injury. In addition, the injection driving mechanism does not need to use electronic elements, reduces the influence of external environment on feedback sound of the sounding assembly, improves the reliability and stability of the sounding assembly, and reduces the cost.

Referring to fig. 11, in an embodiment of the present application, a driving method using the driving mechanism is provided, including:

s110, the rotor 4 receives an axial force from the proximal end to the distal end, and the rotor 4 moves axially to the distal end, so that the third opening 401 of the rotor 4 forms an intersection (not shown) with the first opening 210 of the guide tube 2.

The drive mechanism is started in three stages, namely an initial state, a mixed state and a release state. In the initial state, as shown in fig. 1, the rotor 4 is nested outside the release sleeve 10, and the release sleeve 10 is nested outside the guide tube 2. The distal end surface of the first opening 210 of the guide tube 2 abuts against the first elastic catch 1001 of the release sleeve 10, and the inner wall of the rotor 4 restricts the first elastic catch 1001 of the release sleeve 10 from springing outward.

In an embodiment of the present application, as shown in fig. 12, when the driving mechanism is in a mixed state, an external force is applied to the protection sleeve 11 from the proximal end to the distal end by rotating the protection sleeve 11 (see fig. 7), so that the distal end of the protection sleeve 11 abuts against the rotor 4, and the rotor 4 is pushed to move axially along the distal end. At the end of the movement, the third opening 401 of the rotor 4 moves over the first opening 210 of the guide tube 2, forming an intersection with the first opening 210. In other embodiments, the protective sleeve 11 may be moved distally relative to the housing 1 by rotating the housing 1.

And S120, the distal end of the release sleeve 10 receives a force from the distal end to the proximal end, so that the release sleeve 10 moves axially to the proximal end, the first elastic clamping hook 1001 of the release sleeve 10 moves to an intersection, the first elastic clamping hook 1001 pops up towards the intersection, and the axial limit of the guide tube 2 on the release sleeve 10 is released.

In the embodiment of the present application, as shown in fig. 13, by pressing the second boss 1004 at the distal end of the release sleeve 10, a force is applied to the release sleeve 10 from the distal end to the proximal end, so that the first elastic hook 1001 pops up toward the intersection, and the release sleeve 10 can continue to move proximally in the axial direction.

S130, the second opening 1002 of the release sleeve 10 reaches the position of the elastic arm 204, the elastic arm 204 springs outwards to release the axial limit of the push rod 8, and the push rod 8 moves from the distal end to the proximal end.

In the embodiment of the present application, in the released state of the driving mechanism, as shown in fig. 13, the second opening 1002 reaches the position above the elastic arm 204 of the guide tube 2 by the axial movement of the release sleeve 10, and the elastic arm 204 loses the restriction of the inner wall of the release sleeve 10. The push rod 8 is operated by the second energy storage element 7, so that the elastic arm 204 outwards springs and breaks away from the clamping part, and starts to move from the distal end to the proximal end. The driving mechanism is started and completed, and the push rod is driven to axially move, so that the operation is simple and convenient.

Referring to fig. 6 and 10, in another embodiment of the present application, an automatic injection device includes a medicine carrying assembly and the driving mechanism, the medicine carrying assembly includes a medicine carrier 13, and the medicine carrier 13 encloses a housing cavity 13.5; the first piston 13.1 and the second piston 13.2 are sequentially arranged in the accommodating cavity 13.5, the second piston 13.2 is positioned on one side of the first piston 13.1 close to the push rod 8, and the accommodating cavity 13.5 is divided into a first accommodating cavity and a second accommodating cavity by the first piston 13.1.

In an embodiment of the present application, as shown in fig. 10, the drug carrier 13 may use a dual-cavity cartridge bottle assembly, wherein a first piston 13.1 and a second piston 13.2 are disposed in an inner cavity of the dual-cavity cartridge bottle, and the first piston 13.1 is mounted at a distal end of the outer flange 1301 to form a first sealed cavity, i.e. a first accommodating cavity, and the first accommodating cavity may accommodate a lyophilized active substance, such as powder; the second piston 13.2 is arranged at the far end of the double-cavity card bottle, namely a second sealed cavity between the two pistons is formed, namely a second accommodating cavity which can accommodate solvent, liquid medicine and the like; the aluminum cover 13.3 and the lining gasket 13.4 of the double-cavity clamping bottle assembly are used for riveting the mouth part of the double-cavity clamping bottle; the double-cavity card bottle has good sealing performance and can not cause unexpected or premature liquid medicine mixing.

In the embodiment of the application, the automatic injection device performs powder mixing, and when the automatic injection device is in a mixing state, the drug carrier 13 moves from the proximal end to the distal end, so that the push rod 8 pushes the second piston 13.2 to move axially, and the first piston 13.1 moves from the distal end to the proximal end relative to the drug carrier 13, so that the first accommodating cavity and the second accommodating cavity are communicated, and the liquid medicine in the second accommodating cavity flows into the first accommodating cavity, thereby realizing powder mixing or complete mixing of the two liquid medicines. In other embodiments, other configurations of drug carriers may be used for mixing the drug solution prior to injection. In embodiments of the present application, the drug carrier assembly may effect drug solution mixing prior to injection such that it may cause undesired or premature drug solution mixing.

Referring to fig. 10 and 14, in the embodiment of the present application, as shown in fig. 15, the drug carrier 13 is a dual-cavity cartridge bottle, and the dual-cavity cartridge bottle has an outer protrusion 1301, and in an initial state, the first piston 13.1 is located on a side of the outer protrusion 1301 toward the distal end; in the mixing state, the first piston 13.1 moves to the outer protruding portion 1301, and a communication port (not shown) is formed between the first piston 13.1 and the inner wall of the drug carrier 13, so that the first accommodating cavity or the second accommodating cavity is communicated, and the drug solution in the second accommodating cavity flows into the first accommodating cavity through the communication port, so that powder mixing or complete mixing of the two drug solutions is realized. In another embodiment, the dual-cavity card bottle can also be provided with an inner convex part, the first piston 13.1 is provided with a pit, the pit is matched with the inner convex part, and when the pit is separated from the inner convex part, the pit of the first piston 13.1 forms a communication port with the inner wall of the container. The corresponding inner wall of the protective sleeve 11 is provided with an additional matching part which is embedded with the inner convex part, so as to achieve the effects of fixing the medicine carrier 13 and driving the medicine carrier 13 to axially move. Other configurations of drug carriers may be used in other embodiments to achieve drug solution mixing prior to injection.

Referring to fig. 10 and 16, in the embodiment of the present application, the driving mechanism further includes a housing 1, a protection sleeve 11, and a stop ring 12, where the housing 1 is sleeved on the periphery of the rotor 4, and the guide tube 2 and the release sleeve 10 are located inside the housing 1; one end of the protective sleeve 11 is inscribed on the proximal end of the housing 1; in the embodiment of the application, a first bayonet 1103 is arranged at the distal end of the protective sleeve 11; the outer wall of the baffle ring 12 is provided with two third elastic hooks 1201 and a fastener 1202, the fastener 1202 is embedded into the far end of the straight slot 1102 of the protective sleeve 11, and the third elastic hooks 1201 are buckled on the first bayonet 1103 of the protective sleeve 11, so that the axial movement of the medicine carrier 13 is limited, the tightness of the medicine carrier is ensured, and unexpected or premature medicine liquid mixing is prevented; in another embodiment, the fourth elastic hook of the protection sleeve 11 can be buckled with the second bayonet of the baffle ring, the protection sleeve 11 is internally provided with an inward bulge, and the baffle ring is provided with a notch for matching and fixing; other fixing structures can be provided, so that the medicine carrier 13 can only move axially and cannot rotate circumferentially. Thereby improving the stability and reliability of the driving mechanism.

Referring to fig. 17, another embodiment of the present application further includes an injection method of automatic injection, using the above automatic injection device, including:

S210, the drug carrier 13 receives a force from the proximal end to the distal end, so that the drug carrier 13 moves axially from the proximal end to the distal end relative to the push rod 8, and the push rod 8 pushes the second piston 13.2 to move axially, so as to drive the first piston 13.1 to move synchronously, and the first accommodating cavity is communicated with the second accommodating cavity.

In the embodiment of the present application, when the automatic injection device is in the initial state, as shown in fig. 10, the medicine carrier 13 can ensure the sealing property, and the unexpected or premature medicine liquid mixing is not caused, and the driving mechanism is in the non-activated state.

In an embodiment of the present application, when the protection sleeve 11 is screwed to the housing 1 and the automatic injection device is in a mixing state, the protection sleeve 11 is rotated to enable the protection sleeve 11 to axially move from the proximal end to the distal end, so that a force from the proximal end to the distal end is applied to the medicine carrier 13, the medicine carrier 13 axially moves relative to the push rod 8 from the proximal end to the distal end, so that the push rod 8 pushes the second piston 13.2 to axially move, and because the medicine carrier 13 is in a sealing state, the pressure in the second accommodating cavity is increased due to the movement of the second piston 13.2, and the first piston 13.1 and the second piston 13.2 synchronously move due to the pressure in the second accommodating cavity. When the first piston 13.1 moves to the outer protruding portion 1301, a gap is formed between the first piston 13.1 and the outer protruding portion 1301 to form a communication port, the pressure in the second accommodating cavity becomes small, so that the first piston 13.1 stops moving, the second piston 13.2 continues to be pushed by the push rod 8 to enable the liquid medicine in the second accommodating cavity to flow into the first accommodating cavity through the outer protruding portion 1301, powder mixing or complete mixing of the two liquid medicines is achieved, and the automatic injection device is in a complete mixing state as shown in fig. 14. In other embodiments, the protective sleeve 11 and the housing 1 may be connected in other ways by which the protective sleeve 11 is moved axially distally.

S220, the rotor 4 receives the axial force from the proximal end to the distal end, and the rotor 4 moves axially to the distal end, so that the third opening 401 of the rotor 4 forms an intersection with the first opening 210 of the guide tube 2.

When the protection sleeve 11 is rotated to axially move from the proximal end to the distal end, the distal end of the protection sleeve 11 may be abutted against the rotor 4, so that the rotor 4 is pushed to axially move in the distal direction. In one embodiment of the present application, the distal surface of the protective sleeve 11 is not able to continue to rotate distally when the distal surface of the protective sleeve 11 contacts the proximal surface of the stop collar 9. When the automatic injection device is in a fully mixed state, as shown in fig. 14, the third opening 401 of the rotor 4 moves over the first opening 210 of the guide tube 2, forming an intersection with the first opening 210.

S230, the distal end of the release sleeve 10 receives a force from the distal end to the proximal end, so that the release sleeve 10 moves axially to the proximal end, the first elastic clamping hook 1001 of the release sleeve 10 moves to the intersection, the first elastic clamping hook 1001 of the release sleeve 10 pops up towards the intersection, and the guide tube 2 releases the axial limit of the release sleeve 10;

in an embodiment of the present application, pressing the second boss 1004 on the distal end of the release sleeve 10 applies a distally-to-proximally-directed force to the release sleeve 10, causing it to move axially. After the first elastic hook 1001 of the release sleeve 10 moves to the intersection, the first elastic hook 1001 continues to move to pop out towards the intersection, so that the first elastic hook 1001 can slide on the outer wall of the guide tube 2, and the guide tube 2 releases the axial limit of the release sleeve 10, and the automatic injection device is in a release state, as shown in fig. 18.

S240, the second opening 1002 of the release sleeve 10 reaches the position of the elastic arm 204, the elastic arm 204 springs outwards to release the axial limit of the push rod 8, the push rod 8 moves from the distal end to the proximal end, and the second piston 13.2 is pushed to move from the distal end to the proximal end to complete the injection.

In the embodiment of the present application, after the first elastic hook 1001 pops up from the intersection, the guide tube 2 releases the axial limit of the release sleeve 10, the release sleeve 10 continues to move axially proximally, when the second opening 1002 reaches the position of the elastic arm 204 of the guide tube 2, the driving mechanism is started, the push rod 8 is driven to move proximally from the distal end, and the sound generating assembly is reset through the third energy storage element 3 to provide kinetic energy to prompt the user of the stage of injection. In other embodiments, the first elastic hook 1001 and the second opening 1002 may be simultaneously reached to the position of the elastic arm 204. When the automatic injection device is in the fully released state, as shown in fig. 19, the injection is completed.

The driving mechanism of the embodiment of the application can be divided into two mutually independent stages with certain relevance, namely, in the first stage, the automatic injection device can be in a mixing state, medicines in the first accommodating cavity and medicines in the second accommodating cavity are fully mixed, and the medicine mixing time can be automatically controlled according to the needs, so that the medicine mixing effect is improved. In the second phase, the automatic injection function of the injection device may be activated by directly or indirectly pressing the distal end of the release sleeve 10. Meanwhile, the second stage can be started only after the first stage is started, so that misoperation is avoided. The driving mechanism of the embodiment of the application can be applied to an automatic injection device for realizing the mixing and automatic injection of medicines, so that the application scene of the driving mechanism is wider. The driving mechanism and the automatic injection device enable a user to operate simply, mix medicines uniformly, safely and reliably, facilitate self-injection of patients and realize household and self-administration in the use process.

In the automatic injection device according to the embodiment of the present application, the second boss 1004 corresponds to an injection button, when the injection pen needle is screwed in, the protection sleeve 11 is rotated, the medicine liquid is automatically mixed, and the injection function is automatically unlocked. The needle penetrates the skin, and the injection button is pressed to complete automatic injection; has the functions of sound, vision and touch feedback, and prompts the patient to be in the stage of injection. Is suitable for non-professional self-administration and under emergency and complex environmental conditions.

The foregoing description is only of embodiments of the present application, and is not intended to limit the scope of the application, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present application or directly or indirectly applied to other related technical fields are included in the scope of the present application.

Claims

1. A drive mechanism for an injection device, the drive mechanism comprising:

a push rod (8);

the guide tube (2) is coaxially accommodated in the guide tube (2), the guide tube (2) is provided with an elastic arm (204) and a first opening (210), and the elastic arm (204) is used for limiting the axial movement of the push rod (8);

The release sleeve (10) is coaxially nested on the outer wall of the guide tube (2), a second opening (1002) and a first elastic clamping hook (1001) are arranged on the release sleeve (10), the first elastic clamping hook (1001) is matched with the first opening (210) of the guide tube (2), so that the distal end surface of the first opening (210) of the guide tube (2) prevents the release sleeve (10) from moving towards the distal end, wherein the proximal end is one end close to an injection end, and the distal end is one end far away from the injection end;

the rotor (4) is nested on the outer wall of the release sleeve (10) and used for limiting the first elastic clamping hook (1001) to move radially, a third opening (401) is formed in the rotor (4), the third opening (401) is used for enabling the first elastic clamping hook (1001) to pop up towards the third opening (401) when the first elastic clamping hook (1001) is intersected with the first opening (210) and when the first elastic clamping hook (1001) moves to the intersected position, and therefore the guide tube (2) releases the axial limit of the release sleeve (10); the second opening (1002) reaches the position of the elastic arm (204), the elastic arm (204) outwards flicks to release the axial limit of the push rod (8), and the push rod (8) moves from the distal end to the proximal end.

2. The drive mechanism of claim 1, wherein the drive mechanism comprises a drive mechanism,

the rotor (4) comprises a second elastic clamping hook (402), a first boss (206) is arranged at the proximal end of the guide tube (2), the second elastic clamping hook (402) is matched with the first boss (206) to limit the axial movement of the rotor (4) and the first boss (206), and when the force from the distal end to the proximal end of the release sleeve (10) is smaller than a preset force, the release sleeve (10) and the rotor (4) are relatively static.

3. The drive mechanism of claim 1, wherein the drive mechanism comprises a drive mechanism,

the inner wall of the rotor (4) is provided with a sliding groove (403) extending along the axial direction, the outer wall of the release sleeve (10) is provided with a first positioning bulge (1006) extending along the axial direction, or,

the inner wall of the rotor (4) is provided with a bulge extending along the axial direction, and the outer wall of the release sleeve (10) is provided with a sliding groove extending along the axial direction;

wherein the sliding groove (403) and the first positioning protrusion (1006) are mutually engaged to limit circumferential rotation of the rotor (4) and the release sleeve (10).

4. A drive mechanism according to any one of claims 1-3, further comprising:

the shell (1) is sleeved on the periphery of the rotor (4) and enables the guide tube (2) and the release sleeve (10) to be positioned in the shell (1);

-a protective sleeve (11), one end of the protective sleeve (11) being inscribed in the proximal end of the housing (1).

5. The driving mechanism as recited in claim 4, wherein,

the guide tube (2) is provided with a mounting hook (207), the shell (1) is provided with a limiting opening, and the mounting hook (207) is buckled with the limiting opening to limit the axial and circumferential movement of the guide tube (2) and the shell (1).

6. The driving mechanism as recited in claim 4, wherein,

the protection sleeve (11) is in threaded connection with the shell (1), and when the protection sleeve (11) moves towards the distal end relative to the shell (1), the protection sleeve (11) can be abutted with the end face of the rotor (4) and push the rotor (4) to move towards the distal end axially, so that a third opening (401) of the rotor (4) and the first opening (210) are intersected.

7. The drive mechanism of claim 4, further comprising:

and the limiting ring (9) is buckled on the guide tube (2) and is used for limiting the position of the protective sleeve (11) moving towards the far end relative to the shell (1).

8. The drive mechanism of claim 1, comprising:

the circumferential limiting assembly is arranged on the guide tube (2) and the release sleeve (10) and is used for limiting circumferential rotation of the guide tube (2) and the release sleeve (10).

9. The drive mechanism of claim 1, wherein the drive mechanism comprises a drive mechanism,

the outer wall of the push rod (8) comprises a clamping part, and the clamping part and the elastic arm (204) form an axial limiting assembly.

10. Drive mechanism according to claim 1, characterized in that the outer wall of the release sleeve (10) is provided with a second boss (1004),

the drive mechanism further includes:

the first energy storage element (5) is arranged around the periphery of the release sleeve (10), one end of the first energy storage element (5) abuts against the distal end face (404) of the rotor (4), and the other end of the first energy storage element abuts against the second boss (1004) so as to apply a force to the rotor (4) from the distal end towards the proximal end.

11. The drive mechanism according to claim 1, further comprising a second energy accumulating element (7), the second energy accumulating element (7) being adapted to give the push rod (8) a force such that the second energy accumulating element (7) upon elastic recovery disengages the push rod (8) from the guide tube (2).

12. The drive mechanism of claim 11, wherein the drive mechanism comprises a drive mechanism,

the push rod (8) is provided with a first inner hole with an opening at one end, one end of the first inner hole opposite to the opening is a first end face, the second energy storage element (7) is arranged in the first inner hole, one end of the second energy storage element (7) is propped against the first end face, and the other end of the second energy storage element is propped against the inner end face inside the guide tube (2).

13. The drive mechanism of claim 12, wherein the drive mechanism comprises a drive mechanism,

the device further comprises a guide piece (201), wherein the guide piece (201) is arranged in the first inner hole, and the second energy storage element (7) is sleeved on the guide piece (201) to limit the second energy storage element (7) to provide acting force along the axial direction.

14. The drive mechanism of claim 12, further comprising:

the sound production assembly comprises a sound production ring (6) and a third energy storage element (3), the sound production ring (6) and the third energy storage element (3) are respectively nested with the push rod (8), the third energy storage element (3) is used for providing kinetic energy for the sound production ring (6) to rotate around the axis of the push rod (8), and the sound production ring (6) generates prompt tones in the movement process.

15. A driving method using the driving mechanism according to any one of claims 1 to 14, comprising:

-the rotor (4) receiving an axial force from the proximal end towards the distal end, the rotor (4) being axially displaced towards the distal end such that a third opening (401) of the rotor (4) forms an intersection with the first opening (210) of the guide tube (2);

the distal end of the release sleeve (10) receives a force from the distal end to the proximal end, so that the release sleeve (10) moves axially to the proximal end, the first elastic clamping hook (1001) of the release sleeve (10) moves to the intersection, the first elastic clamping hook (1001) pops up towards the intersection, and the guide tube (2) releases the axial limit of the release sleeve (10);

The second opening (1002) of the release sleeve (10) reaches the position of the elastic arm (204), the elastic arm (204) is sprung outwards to release the axial limit of the push rod (8), and the push rod (8) moves from the distal end to the proximal end.

16. The driving method according to claim 15, characterized in that the driving structure further comprises a housing (1) and a protective sleeve (11), the housing being arranged around the rotor (4) such that the guide tube (2) and the release sleeve (10) are located inside the housing (1); one end of the protective sleeve (11) is inscribed on the proximal end of the shell (1);

-said rotor (4) receiving an axial force from said proximal end to said distal end, comprising:

the housing (1) or/and the protective sleeve (11) receives a force, so that the protective sleeve (11) moves distally relative to the housing (1), and the end face of the protective sleeve (11) close to the distal end is abutted with the rotor (4), and the rotor (4) is given an axial force from the proximal end to the distal end.

17. An automatic injection device comprising a drug carrier assembly and a drive mechanism, the drive mechanism comprising:

The rotor (4) is nested on the outer wall of the release sleeve (10) and is used for limiting the first elastic clamping hook (1001) of the release sleeve (10) to move radially, a third opening (401) is formed in the rotor (4), the third opening (401) is used for enabling the guide tube (2) to release the axial limit of the release sleeve (10) when the third opening (401) is intersected with the first opening (210) of the guide tube (2) and when the first elastic clamping hook (1001) moves to the intersected position, the first elastic clamping hook (1001) ejects towards the third opening (401); the second opening (1002) of the release sleeve (10) reaches the position of the elastic arm (204) of the guide tube (2), the elastic arm (204) is outwards sprung to release the axial limit of the push rod (8), and the push rod (8) moves from the distal end to the proximal end, wherein the proximal end is one end close to an injection end, and the distal end is one end far away from the injection end;

the drug carrier assembly includes:

a medicine carrier (13), wherein the medicine carrier (13) is enclosed into a containing cavity (13.5);

the first piston (13.1) and the second piston (13.2) are sequentially arranged in the accommodating cavity, the second piston (13.2) is positioned on one side of the first piston (13.1) close to the push rod (8), and the accommodating cavity is divided into a first accommodating cavity and a second accommodating cavity by the first piston (13.1);

The medicine carrier (13) moves axially relative to the push rod (8) from the proximal end to the distal end, so that the push rod (8) pushes the second piston (13.2) to move axially, the first piston (13.1) is driven to move synchronously, and the first accommodating cavity is communicated with the second accommodating cavity.

18. The automatic injection device of claim 17, further comprising:

a push rod (8);

the guide tube (2) is coaxially accommodated in the push rod (8), the guide tube (2) is provided with the elastic arm (204) and the first opening (210), and the elastic arm (204) is used for limiting the axial movement of the push rod (8);

the release sleeve (10), release sleeve (10) coaxial nest is in stand pipe (2) outer wall, be provided with on release sleeve (10) second opening (1002) with first elasticity pothook (1001), first elasticity pothook (1001) with first opening (210) cooperation of stand pipe (2), so that the distal end face of first opening (210) of stand pipe (2) prevents release sleeve (10) to the distal end removes.

19. An automatic injection device according to claim 17 or 18, further comprising a drive mechanism according to any of claims 2-14.

20. An automatic injection device according to claim 17 or 18, wherein,

the drug carrier (13) comprises an outer flange (1301), the first piston (13.1) being located towards the distal end side of the outer flange (1301) in an initial state; when the first piston (13.1) moves to the outer protruding part (1301), a communication port is formed between the first piston (13.1) and the inner wall of the medicine carrier (13), so that the first accommodating cavity or the second accommodating cavity is communicated.

21. The automatic injection device of claim 20, wherein the injection device comprises a housing,

the driving mechanism further comprises a shell (1) and a protective sleeve (11), wherein the shell is sleeved on the periphery of the rotor (4) and enables the guide tube (2) and the release sleeve (10) to be positioned in the shell (1); one end of the protective sleeve (11) is inscribed on the proximal end of the shell (1);

the medicine carrier (13) is fixed on the protection sleeve (11) through the outer protruding part, so that the axial movement of the protection sleeve (11) drives the medicine carrier (13) to move axially.

22. An injection method of automatic injection, characterized in that an automatic injection device according to any one of claims 17-21 is used;

The medicine carrier (13) receives acting force from the proximal end to the distal end, and the medicine carrier (13) axially moves relative to the push rod (8) from the proximal end to the distal end, so that the push rod (8) pushes the second piston (13.2) to axially move to drive the first piston (13.1) to synchronously move, and the first accommodating cavity is communicated with the second accommodating cavity;

the distal end of the release sleeve (10) receives a force from the distal end to the proximal end, so that the release sleeve (10) moves axially proximally, the first elastic clamping hook (1001) of the release sleeve (10) moves to the intersection, the first elastic clamping hook (1001) pops up towards the intersection, and the guide tube (2) releases the axial limit of the release sleeve (10);

the second opening (1002) of the release sleeve (10) reaches the position of the elastic arm (204), the elastic arm (204) is sprung outwards to release the axial limit of the push rod (8), the push rod (8) moves from the distal end to the proximal end, and the second piston is pushed to move from the distal end to the proximal end so as to complete injection.

23. The method of injection according to claim 22, wherein the injection is performed,

the drug carrier (13) receives a proximal-to-distal force, and the rotor (4) receives an axial force from the proximal end to the distal end, comprising:

the housing (1) or/and the protective sleeve (11) receives acting force, so that the protective sleeve (11) moves towards the distal end relative to the housing (1) and drives the medicine carrier (13) to receive acting force from the proximal end to the distal end; an end face of the protective sleeve (11) near the distal end is abutted against the rotor (4), and the rotor (4) is given an axial force applied from the proximal end to the distal end.