Drive mechanism, drive method, automatic injection device and injection method

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 push rod is coaxially arranged in the guide tube. The guide tube is provided with elastic arms and a first opening. The release sleeve is coaxially nested on the outer wall of the guide tube. The release sleeve is provided with a second opening and a first elastic hook. The rotor is nested on the outer wall of the release sleeve and is used for limiting the radial movement of the first elastic hook. The rotor is provided with a third opening. When the first opening and the third opening intersect, and when the first elastic hook moves to the intersecting position, the first elastic hook is ejected towards the third opening, so that the guide tube releases the axial limitation on the release sleeve. When the second opening reaches the position of the elastic arms, the outer elastic arms release the axial limitation on the push rod, and the push rod moves from the distal end to the proximal end. The control start of multiple nodes can be realized, and the uniformity of drug mixing during injection is improved.

Description

TECHNICAL FIELD

[0001] The present 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

[0002] Currently, there are some injection drugs that cannot be mixed in advance and stored for a long time before being injected into the human body. Because the drugs are unstable, they will quickly lose their efficacy. Therefore, the user, such as the patient himself or a medical staff, must mix the drugs within a limited time before delivering a certain dose of the drugs to the patient. This operation mode brings great inconvenience to the user. The current automatic injection device cannot mix the drugs before injection, or the drugs are not uniformly mixed before injection, which has adverse effects on the user and limits the use of the drugs or reduces the user experience when using the automatic injection device. SUMMARY

[0003] The present application provides a driving mechanism, a driving method, an automatic injection device and an injection method. The driving mechanism can control the working of the driving mechanism with multiple nodes, which is beneficial to the uniformity of drug mixing when applied to an injection device.

[0004] To solve the above technical problems, one technical solution adopted by the present application is to provide a driving mechanism for an injection device, which comprises a push rod, a guide tube, a release sleeve and a rotor. The push rod is coaxially arranged in the guide tube. The guide tube is provided with an elastic arm and a first opening. The elastic arm is used to limit the axial movement of the push rod. The release sleeve is coaxially nested on the outer wall of the guide tube. The release sleeve is provided with a second opening and a first elastic hook. The first elastic hook cooperates with the first opening of the guide tube to limit the axial movement of the release sleeve. The near end is the end close to the injection end, and the far end is the end away from the injection end. The rotor is nested on the outer wall of the release sleeve to limit the radial movement of the first elastic hook. The rotor is provided with a third opening. When the first opening and the third opening intersect, and when the first elastic hook moves to the intersection position, the first elastic hook pops towards the third opening, so that the guide tube releases the axial limitation of the release sleeve. When the second opening reaches the position of the elastic arm, the elastic arm releases the axial limitation of the push rod, and the push rod moves from the far end to the near end.

[0005] The rotor comprises a second elastic hook, and the near end of the guide tube is provided with a first boss. The second elastic hook cooperates with the first boss to limit the axial movement of the rotor and the first boss, so that the release sleeve is relatively stationary with the rotor when the force from the far end to the near end acting on the release sleeve is less than a preset force.

[0006] The inner wall of the rotor is provided with an axially extending sliding groove, or the outer wall of the release sleeve is provided with an axially extending first positioning protrusion, or the inner wall of the rotor is provided with an axially extending first positioning protrusion, and the outer wall of the release sleeve is provided with an axially extending sliding groove; the sliding groove and the first positioning protrusion are embedded with each other to limit the circumferential rotation of the rotor and the release sleeve.

[0007] The driving mechanism further comprises a shell and a release sleeve; the shell is sleeved on the outer periphery of the rotor, and the guide pipe and the release sleeve are located inside the shell; one end of the protective sleeve is connected to the proximal end of the shell.

[0008] The guide pipe is provided with a mounting hook, and the shell is provided with a limiting opening; the mounting hook is buckled with the limiting opening to limit the axial and circumferential movement of the guide pipe and the shell.

[0009] The protective sleeve is screwed with the shell, and when the protective sleeve moves away from the shell, the protective sleeve can abut against the end face of the rotor and push the rotor to move axially away from the shell, so that the third opening and the first opening of the rotor intersect.

[0010] The driving mechanism further comprises a limiting ring, which is buckled on the guide pipe to limit the position of the protective sleeve moving away from the shell.

[0011] The circumferential limiting assembly is arranged on the guide pipe and the release sleeve to limit the circumferential rotation of the guide pipe and the release sleeve.

[0012] The outer wall of the push rod comprises a clamping part, and the clamping part and the elastic arm form an axial limiting assembly.

[0013] The outer wall of the release sleeve is provided with a second protrusion, and the driving mechanism further comprises a first energy storage element; the first energy storage element is annularly arranged on the outer periphery of the release sleeve, one end of the first energy storage element abuts against the distal end face of the rotor, and the other end abuts against the second protrusion to give the rotor an action force from the distal end to the proximal end.

[0014] The driving mechanism further comprises a second energy storage element, which is used to give the push rod an action force, so that the second energy storage element makes the push rod and the guide pipe disengage when the elastic recovery.

[0015] The push rod is provided with a first inner hole with an open end, and the first end face opposite to the open end of the first inner hole; the second energy storage element is arranged in the first inner hole, and one end of the second energy storage element abuts against the first end face, and the other end abuts against the inner end face inside the guide pipe.

[0016] The driving mechanism further comprises a guide piece arranged in the first inner hole, and the second energy storage element is sleeved on the guide piece to limit the axial action force of the second energy storage element.

[0017] The driving mechanism further comprises a sound generating assembly, the sound generating assembly comprises a sound generating ring and a third energy storage element, the sound generating 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 the sound generating ring to rotate around the push rod axis, and the sound generating ring generates a prompt sound in the movement process.

[0018] The application further comprises a second technical scheme, a driving method of the driving mechanism, the driving method comprises the following steps: the rotor receives an axial force from the proximal end to the distal end, the rotor moves axially to the distal end, so that the third opening of the rotor and the first opening of the guide tube form a crossing; the distal end of the release sleeve receives an axial force from the distal end to the proximal end, so that the release sleeve moves axially to the proximal end, so that the first elastic clamping hook of the release sleeve moves to the crossing, the first elastic clamping hook pops out towards the crossing, and the axial positioning of the release sleeve by the guide tube is released; the second opening of the release sleeve reaches the elastic arm position, the elastic arm outside the elastic arm position releases the axial positioning of the push rod, and the push rod moves from the distal end to the proximal end.

[0019] The driving mechanism further comprises a shell and a protective sleeve, the shell is sleeved on the outer periphery of the rotor, and the guide tube and the release sleeve are located inside the shell; one end of the protective sleeve is in contact with the proximal end of the shell; the rotor receives an axial force from the proximal end to the distal end, the shell or / and the protective sleeve receives the force, so that the protective sleeve moves to the distal end relative to the shell, and the end face close to the distal end of the protective sleeve abuts against the rotor, thereby giving the rotor an axial force from the proximal end to the distal end.

[0020] The application further comprises a third technical scheme, an automatic injection device, comprising a drug carrier assembly and the above-mentioned driving mechanism, the drug carrier assembly comprises a drug carrier, the drug carrier surrounds a containing cavity; a first piston and a second piston are arranged in the containing cavity in sequence, the second piston is located on the side close to the push rod of the first piston, and the first piston divides the containing cavity into a first containing cavity and a second containing cavity; wherein the drug carrier moves axially from the proximal end to the distal end relative to the push rod, so that the push rod drives the second piston to move axially, thereby driving the first piston to move synchronously, and the first containing cavity and the second containing cavity are communicated.

[0021] The drug carrier comprises an outer convex part, in the initial state, the first piston is located on the side close to the distal end of the outer convex part; when the first piston moves to the outer convex part, the first piston and the inner wall of the drug carrier form a communication port, so that the first containing cavity or the second containing cavity is communicated.

[0022] The driving mechanism further comprises a shell and a protection sleeve and a stop ring, the shell is sleeved on the outer periphery of the rotor and makes the guide tube and the release sleeve located inside the shell, one end of the protection sleeve is in contact with the proximal end of the shell, the protection sleeve limits the axial movement of the medicine carrier through the stop ring, the medicine carrier is fixed to the protection sleeve through the outer convex part, so that the axial movement of the protection sleeve drives the axial movement of the medicine carrier.

[0023] The fourth technical solution of the application is an automatic injection method using the automatic injection device, including that the medicine carrier receives the force from the proximal end to the distal end, the medicine carrier moves axially from the proximal end to the distal end relative to the push rod, so that the push rod pushes the second piston to move axially to drive the first piston to move synchronously, so that the first accommodation cavity and the second accommodation cavity are communicated; the rotor receives the axial force from the proximal end to the distal end, the rotor moves axially to the distal end to make the third opening of the rotor and the first opening of the guide tube form a cross section; the distal end of the release sleeve receives the force from the distal end to the proximal end, so that the release sleeve moves axially to the proximal end to make the first elastic hook of the release sleeve move to the cross section, the first elastic hook of the release sleeve pops towards the cross section, so that the guide tube releases the axial location of the release sleeve; the second opening of the release sleeve reaches the elastic arm position, the elastic arm releases the axial location of the push rod, the push rod moves from the distal end to the proximal end, and pushes the second piston to move from the distal end to the proximal end to complete the injection.

[0024] The driving mechanism further comprises a shell and a protection sleeve, the shell is sleeved on the outer periphery of the rotor and makes the guide tube and the release sleeve located inside the shell, one end of the protection sleeve is in contact with the proximal end of the shell, the medicine carrier receives the force from the proximal end to the distal end, and the rotor receives the axial force from the proximal end to the distal end, including that the shell or / and the protection sleeve receives the force, so that the protection sleeve moves to the distal end relative to the shell, and the medicine carrier receives the force from the proximal end to the distal end; the end face of the protection sleeve close to the distal end abuts against the rotor, and the rotor is given the axial force from the proximal end to the distal end.

[0025] The beneficial effects of this application are as follows: Unlike existing technologies, the driving mechanism provided in this application is used in an automatic injection device. The driving mechanism includes a push rod, a guide tube, a release sleeve, and a rotor. The push rod is coaxially housed within the guide tube, which has an elastic arm and a first opening. The elastic arm limits the axial movement of the push rod. The release sleeve is coaxially nested within the outer wall of the guide tube, and a first elastic hook is provided on the release sleeve. The rotor is nested within the outer wall of the release sleeve, and the inner wall of the rotor limits the radial movement of the first elastic hook. This allows the rotor to engage with the first opening of the guide tube, effectively limiting the axial movement of the first elastic hook and preventing the release sleeve from moving axially to the distal end. In the technical solution of this application embodiment, a third opening is provided on the rotor and a first opening is provided on the guide tube. When the third opening intersects with the first opening, and when the first elastic hook moves to the intersection position, the first elastic hook pops out toward the third opening, causing the guide tube hook to release the axial restriction on the release sleeve; when the second opening reaches the position of the elastic arm, the elastic arm pops outward, releasing the axial restriction on the push rod, and the push rod moves from the distal end to the proximal end, thus activating the push rod. This application provides a drive mechanism that, by nesting a release sleeve on the outer wall of the guide tube, providing a first elastic hook on the release sleeve, and nesting a rotor on the outer wall of the release sleeve, allows the rotor and guide tube to cooperate in limiting the first elastic hook. The drive mechanism of this application, through the interaction between the push rod, guide tube, release sleeve, and rotor, can achieve multi-node control to start the push rod, which is beneficial to the uniformity of drug mixing when applied to an injection device, making the drive mechanism more widely applicable and easier to operate. Attached Figure Description

[0026] Figure 1 This is a three-dimensional structural cross-sectional view of an embodiment of the drive mechanism provided in this application in its initial state;

[0027] Figure 2 This is a three-dimensional structural schematic diagram of the guide tube of an embodiment of the drive mechanism provided in this application;

[0028] Figure 3 This is a three-dimensional structural schematic diagram of the release sleeve according to an embodiment of the drive mechanism provided in this application;

[0029] Figure 4 This is a three-dimensional structural schematic diagram of the rotor of an embodiment of the drive mechanism provided in this application;

[0030] Figure 5 This is an assembly drawing of the rotor and guide tube of an embodiment of the drive mechanism provided in this application;

[0031] Figure 6 This is an overall exploded view of an embodiment of the automatic injection device provided in this application;

[0032] Figure 7is a schematic diagram of an overall structure of an embodiment of the automatic injection device provided in the present application;

[0033] Figure 8 is a schematic diagram of a protective sleeve of an embodiment of the driving mechanism provided in the present application;

[0034] Figure 9 is a schematic diagram of another embodiment of the driving mechanism provided in the present application;

[0035] Figure 10 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in an initial state;

[0036] Figure 11 is a schematic diagram of a driving method of an embodiment of the driving mechanism provided in the present application;

[0037] Figure 12 is a schematic diagram of a cross-section structure of an embodiment of the driving mechanism provided in the present application in a mixed state;

[0038] Figure 13 is a schematic diagram of a cross-section structure of an embodiment of the driving mechanism provided in the present application in a released state;

[0039] Figure 14 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in a completely mixed state;

[0040] Figure 15 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in a completely released state.

[0041] Figure 16 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in a completely released state.

[0042] Figure 17 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in a completely released state.

[0043] Figure 18 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in a completely released state.

[0044] Figure 19 is a schematic diagram of a half cross-section structure of an embodiment of the automatic injection device provided in the present application in a completely released state. DETAILED DESCRIPTION

[0045] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0046] The terms "first", "second" in the present application are only used for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0047] In the embodiments of the present application, the proximal end is the end close to the injection end, i.e. the end close to the needle of the automatic injection device, and the distal end is the end away from the injection end.

[0048] Please refer to Figure 1 The present application provides a driving mechanism for an automatic injection device, which comprises a push rod 8, a guide tube 2, a release sleeve 10 and a rotor 4. The push rod 8 is coaxially contained in the guide tube 2, the guide tube 2 is provided with an elastic arm 204 and a first opening 210, the elastic arm 204 is used to limit 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 hook 1001, the first elastic hook 1001 is used to cooperate with the first opening 210, so that the distal end surface 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 is used to limit the radial movement of the first elastic hook 1001, the rotor 4 is provided with a third opening 401, the third opening 401 is used to make the first elastic hook 1001 pop towards the third opening 401 when the first elastic hook 1001 moves to the intersecting position, so that the guide tube 2 releases the axial limitation of the release sleeve 10; the second opening 1002 reaches the position of the elastic arm 204, the outer elastic arm 204 releases the axial limitation of the push rod 8, and the push rod 8 moves from the distal end to the proximal end.

[0049] In the embodiment of the present application, the driving mechanism includes a push rod 8, a guide tube 2, a release sleeve 10 and a rotor 4 coaxially nested. The guide tube 2 is provided with an elastic arm 204 and a first opening 210, the elastic arm 204 can limit the axial movement of the push rod 8; the release sleeve 10 is provided with a first elastic hook 1001, the first elastic hook 1001 can cooperate with the first opening 210 to limit the axial movement of the release sleeve 10; the inner wall of the rotor 4 prevents the first elastic hook 1001 from being ejected outward, so that the first elastic hook 1001 cooperates with the first opening 210, and the guide tube 2 plays a role in preventing the release sleeve 10 from moving to the distal end. In the technical scheme of the embodiment of the present application, the rotor 4 is provided with a third opening 401, and the guide tube 2 is provided with a first opening 210. When the third opening 401 intersects with the first opening 210, and when the first elastic hook 1001 moves to the intersection position, the first elastic hook 1001 is ejected towards the third opening 401, so that the guide tube 2 releases the axial positioning of the release sleeve 10; the second opening 1002 reaches the position of the elastic arm 204, the elastic arm 204 is ejected outward, releasing the axial positioning of the push rod 8, the push rod 8 moves from the distal end to the proximal end, the push rod 8 is started, and the driving mechanism is completed. The driving mechanism provided by the present application sets the first elastic hook 1001 on the release sleeve 10 and nests the rotor 4 on the outer wall of the release sleeve 10, so that the rotor 4 can limit the first elastic hook 1001. The driving mechanism of the present application can realize the control and starting of the push rod 8 through the interaction between the push rod 8, the guide tube 2, the release sleeve 10 and the rotor 4, so that it can be applied to the injection device, which is beneficial to the uniformity of drug mixing, and the driving mechanism has a wider application scene and is convenient to operate.

[0050] 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, the axial position of the release sleeve 10 is limited in the initial state.

[0051] Specifically, in the embodiment of the present application, please refer to Figure 1 and Figure 2 The guide tube 2 has an inner cavity, which can accommodate the push rod 8 and limit 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 on the proximal side of the elastic arm 204.

[0052] Please refer to Figure 1 , Figure 3 and Figure 9The release sleeve 10 is coaxially nested outside the guide tube 2, and limits the guide tube 2 so that the guide tube 2 can only move axially and cannot rotate circumferentially. The release sleeve 10 is provided with a first elastic hook 1001 at the proximal end, and a second opening 1002 is arranged at the side distal to the first elastic hook 1001; the first elastic hook 1001 is used to limit the axial movement of the release sleeve 10, so that the release sleeve 10 does not move axially in the initial state.

[0053] Please refer to Figure 1 and Figure 4 The proximal end of the rotor 4 is provided with a third opening 401, which is used to cooperate with the first opening 210 of the guide tube 2 to release the restriction of the first elastic hook 1001 by the rotor 4, so that the driving mechanism can be normally started.

[0054] Please refer to Figure 1 and Figure 5 In an embodiment of the present application, the rotor 4 further comprises a second elastic hook 402 at the proximal end; the proximal end of the guide tube 2 is provided with a first boss 206, and the second elastic hook 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 the rotor 4 when the force applied to the release sleeve 10 from the distal end to the proximal end is less than the preset force. In the embodiment of the present application, the second elastic hook 402 on the rotor 4 cooperates with the first boss 206 of the guide tube 2, which can serve as a safety device to prevent the driving mechanism from being started due to accidental touch. The preset force in the embodiment of the present application is a force that prevents accidental touch. That is, when the axial force generated by accidental touch is less than the preset force, the second elastic hook 402 is lapped on the first boss 206, and the two cooperate with each other; in the case of non-accidental touch, the driving mechanism needs to be started, and the 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 and the first boss 206 are disengaged. The driving mechanism provided in the embodiment of the present application can be used in 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 an external force from the distal end to the proximal end, the external force is less than the preset force, and the release sleeve 10 and the rotor 4 are relatively stationary, thereby preventing the driving mechanism from being started due to accidental touch. In the embodiment of the present application, the first boss 206 has a circular arc protrusion, which can make the second elastic hook 402 pass over the first boss 206 when the driving mechanism is normally started.

[0055] Please refer to Figure 3 and Figure 4The inner wall of the rotor 4 is provided with sliding grooves 403 extending in the axial direction, and the outer wall of the release sleeve 10 is provided with first positioning protrusions 1006 extending in the axial direction. The sliding grooves 403 and the first positioning protrusions 1006 are matched with each other, so that the rotor 4 can only move 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 are arranged in an axial symmetry, and the sliding grooves 403 are also arranged in two rows, and the two rows of sliding grooves 403 are matched with the first positioning protrusions 1006 respectively, so that the rotor 4 cannot rotate in the circumferential direction relative to the release sleeve 10. In another embodiment of the application, the first positioning protrusions 1006 extending in the axial direction can be arranged on the inner wall of the rotor 4, and the sliding grooves 403 extending in the axial direction can be arranged on the outer wall of the release sleeve 10. In other embodiments, the number of the first positioning protrusions 1006 can be arranged in one row or multiple rows, and the number of the sliding grooves 403 can also be arranged in one row or multiple rows, and the first positioning protrusions 1006 and the sliding grooves 403 can be matched with each other to limit the circumferential rotation. The two rows or multiple rows of first positioning protrusions 1006 or sliding grooves 403 can be arranged in an axial symmetry to improve the uniformity of stress, or can be arranged in a non-axial symmetry.

[0056] Please refer to Figure 6 and Figure 7 In the embodiment of the application, the driving mechanism further comprises a housing 1 and a protective sleeve 11. The housing 1 is sleeved on the outer periphery of the rotor 4, and the guide pipe 2 and the release sleeve 10 are located inside the housing 1. One end of the protective sleeve 11 is connected to the proximal end of the housing 1.

[0057] Specifically, in the embodiment of the application, the distal end of the protective sleeve 11 is connected to the proximal end of the housing 1, and the proximal end of the protective sleeve 11 is used for connecting the injection pen needle. In the embodiment of the application, the proximal end of the protective sleeve 11 is provided with a first thread 1104, which is used for screwing with the injection pen needle to improve the stability of the connection, thereby improving the safety and reliability of the driving mechanism. In other embodiments, the connection can also be achieved by other means.

[0058] In the embodiment of the application, the housing 1 is sleeved on the outer periphery of the rotor 4, and the guide pipe 2 and the release sleeve 10 are located inside the housing 1, so as to protect the rotor 4, the guide pipe 2, the release sleeve 10, the guide pipe 2 and other components from external damage, such as accidentally dropping the driving mechanism on the ground.

[0059] Please refer to Figure 2 and Figure 6In an embodiment of the present application, the end surface of the first boss 206 of the guide tube 2 is provided with a mounting hook 207, and a limiting opening is correspondingly provided on the shell 1. The mounting hook 207 is buckled with the limiting opening, so as to limit the circumferential rotation of the guide tube 2 and the shell 1, so that the driving mechanism cannot be twisted, and the stability and safety of the driving mechanism are improved. Meanwhile, the mounting hook 207 is buckled with the limiting opening, so as to limit the axial movement of the guide tube 2 and the shell 1, so that the guide tube 2 and the shell 1 are axially relatively stationary. In another embodiment, the end surface of the first boss 206 can also be provided as a limiting opening, and a mounting hook 207 is correspondingly provided on the shell 1. In other embodiments, other structures capable of corresponding buckling can also be provided, so as to limit the circumferential rotation and axial movement of the guide tube 2 and the shell 1.

[0060] Please refer to Figure 7 , Figure 8 and Figure 10 In an embodiment of the present application, the distal end of the protective sleeve 11 is provided with a second thread 1101, which is an external thread. The proximal end of the shell 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 relative to the shell 1 towards the distal end, the protective sleeve 11 can abut against the proximal end surface of the rotor 4, and push the rotor 4 to move axially towards the distal end. At the same time, the rotor 4 cannot be pushed to move due to the reaction force of the rotor 4, so as to make the third opening 401 of the rotor 4 and the first opening 210 of the guide tube 2 cross, and the driving mechanism can be normally started. In other embodiments, the connection mode of the protective sleeve 11 and the shell 1 can also be other modes, so that the protective sleeve 11 can push the rotor 4 to move axially towards the distal end, which is not limited here.

[0061] Please refer to Figure 6 and Figure 14 In an embodiment of the present application, the driving mechanism further comprises a limiting ring 9, which is buckled on the proximal end of the guide tube 2, and is used to limit the position of the protective sleeve 11 moving from the distal end to the proximal end, so as to protect the normal operation of the driving mechanism, and improve the reliability of the automatic injection device.

[0062] Please refer to Figure 2 and Figure 3The driving mechanism in the embodiments of the present application further comprises a circumferential limiting assembly. The circumferential limiting assembly is arranged on the guide tube 2 and the release sleeve 10 to limit the circumferential rotation of the guide tube 2 and the release sleeve 10. In an embodiment of the present application, the circumferential limiting assembly comprises a second positioning protrusion 205 and a groove 1005. The second positioning protrusion 205 is arranged on the outer periphery of the proximal end of the guide tube 2. Correspondingly, the groove 1005 is arranged in the release sleeve 10. The width of the groove 1005 is arranged to be just enough to accommodate the second positioning protrusion 205. 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, thereby ensuring the normal operation of the driving mechanism. In other embodiments, the guide tube 2 can also be arranged as a groove, and the release sleeve 10 can be correspondingly arranged with an inner protrusion, or the circumferential limiting assembly can comprise other structures for limiting the circumferential rotation of the guide tube 2 and the release sleeve 10.

[0063] Referring to Figure 6 , the push rod 8 is arranged with a clamping portion. The clamping portion cooperates with the elastic arm 204 to form an axial limiting assembly, which limits the axial movement of the push rod 8. In the embodiments of the present application, the clamping portion comprises an I-shaped table and a trapezoidal table. In other embodiments, the clamping portion can also have other shapes or structures.

[0064] Referring to Figure 4 and Figure 9 , the outer wall of the release sleeve 10 is arranged with a second protrusion 1004, which has a proximal end face 1007. The driving mechanism in the embodiments of the present application further comprises a first energy storage element 5, which is arranged around the outer 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 abuts against the proximal end face 1007 of the second protrusion 1004. Thus, the distal end of the rotor 4 is given a force towards the proximal end. The position of the rotor 4 can be at a predetermined position in different states of the driving mechanism, and the rotor 4 cannot move randomly, so that the driving mechanism has strong stability.

[0065] Referring to Figure 6 , the driving mechanism in the embodiments of the present application further comprises a second energy storage element 7 for giving the push rod 8 a force, so that the push rod 8 is separated from the guide tube 2 when the second energy storage element 7 is elastically recovered. Specifically, when the driving mechanism is working, the second energy storage element 7 can push the push rod 8 to move axially, so that the push rod 8 is separated from the axial limitation of the guide tube 2.

[0066] In the embodiments of the present application, the push rod 8 is arranged with a first inner hole (not shown in the figure) with an open end. The end of the first inner hole opposite to the open end 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 abuts against the first end face, and the other end abuts against the end face inside the guide tube 2. When the driving mechanism is not started, the second energy storage element 7 is in a compressed state.

[0067] AsFigure 10 As shown, the driving mechanism of the embodiment of the present application further comprises a guide member 201 arranged in the first inner hole. The second energy storage element 7 is sleeved on the guide member 201, thereby defining the second energy storage element 7 to provide an axial force, so that the second energy storage element 7 gives the push rod 8 an axial force, so that the push rod 8 is subjected to a larger axial force.

[0068] As shown in the drawings, Figure 2 And Figure 6 The driving mechanism of the embodiment of the present application further comprises a sound emitting assembly. The sound emitting assembly comprises a sound emitting ring 6 and a third energy storage element 3. The sound emitting 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 to provide kinetic energy for the sound emitting ring 6 to rotate around the axis of the push rod 8. The guide tube 2 further comprises a first abutting surface 202, a second abutting surface (not marked in the figure), an inclined surface 203 and a terminal surface (not shown in the figure). The first abutting surface 202 is at the distal end of the inclined surface 203, and the second abutting surface is at the proximal end of the inclined surface 203. When the driving mechanism is driven, the sound emitting ring 6 rotates under the action of the third energy storage element 3 in the energy storage state, collides with the first abutting surface 202 to emit a "click" sound, prompting the patient to start injection. As the sound emitting ring 6 moves to the inclined surface, the inclined surface makes the sound emitting ring 6 rotate, driving the third energy storage element 3 in the energy storage state to continue to store energy. When the sound emitting ring 6 reaches the second abutting surface, the third energy storage element 3 ends the energy storage, and the second abutting surface can prevent the sound emitting ring 6 from rotating. The push rod 8 continues to drive the sound emitting ring 6 to move, and when the sound emitting ring 6 is separated from the second abutting surface, the rotation of the sound emitting ring 6 is no longer limited, and the third energy storage element 3 in the energy storage state releases the stored torsional force, driving the sound emitting ring 6 to rotate, and at the same time, the sound emitting ring 6 falls on the terminal surface which has a height difference with the second abutting surface, and the sound emitting ring 6 collides with the terminal surface to emit a "click" sound, i.e. the termination prompt sound, prompting the injection recipient that the injection is about to end. The sound emitting assembly provided by the present application, the third energy storage element 3 in the energy storage state provides kinetic energy for the sound emitting ring 6 to rotate, so that when the sound emitting ring 6 moves from the distal end to the proximal end, the third energy storage element 3 in the energy storage state stores energy to drive the sound emitting ring 6 to rotate. At the beginning of injection, the sound emitting ring 6 collides with the first abutting surface 202 to produce a starting prompt sound; at the end of injection, the sound emitting ring 6 collides with the terminal surface to produce a termination prompt sound; effectively preventing the injection recipient from misjudging the injection process during injection, causing harm. Moreover, the injection driving mechanism does not need to use electronic components, reducing the influence of the external environment on the feedback sound of the sound emitting assembly, improving the reliability and stability of the sound emitting assembly, and reducing the cost.

[0069] As shown in the drawings, Figure 11 In the embodiment of the present application, a driving method using the above driving mechanism is provided, comprising:

[0070] 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 a cross (not marked in the figure) with the first opening 210 of the guide tube 2.

[0071] The driving mechanism has three stages, namely initial state, mixed state and release state. In the initial state, as shown in the figure, 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 face of the first opening 210 of the guide tube 2 abuts against the first elastic hook 1001 of the release sleeve 10, and the inner wall of the rotor 4 limits the outward movement of the first elastic hook 1001 of the release sleeve 10. Figure 1

[0072] In an embodiment of the present application, in the mixed state of the driving mechanism, as shown in the figure, the protective sleeve 11 is rotated (see Figure 12 Figure 7 , an external force is applied to the protective sleeve 11 from the proximal end to the distal end, so that the distal end of the protective sleeve 11 abuts against the rotor 4 and pushes the rotor 4 to move axially to the distal end. At the end of the movement, the third opening 401 of the rotor 4 moves above the first opening 210 of the guide tube 2 and forms a cross with the first opening 210. In other embodiments, the protective sleeve 11 can also be moved to the distal end relative to the shell 1 by rotating the shell 1.

[0073] S120, the distal end of the release sleeve 10 receives an axial force from the distal end to the proximal end, so that the release sleeve 10 moves axially to the proximal end, so that the first elastic hook 1001 of the release sleeve 10 moves to the cross, the first elastic hook 1001 pops towards the cross, and the axial limit of the guide tube 2 to the release sleeve 10 is released.

[0074] In an embodiment of the present application, as shown in the figure, by pressing the second boss 1004 at the distal end of the release sleeve 10, an axial force is applied to the release sleeve 10 from the distal end to the proximal end, so that the first elastic hook 1001 pops towards the cross, and the release sleeve 10 can continue to move axially to the proximal end. Figure 13

[0075] S130, the second opening 1002 of the release sleeve 10 reaches the position of the elastic arm 204, the elastic arm 204 pops out to release the axial limit of the push rod 8, and the push rod 8 moves from the distal end to the proximal end.

[0076] In an embodiment of the present application, in the release state of the driving mechanism, as shown in the figure, Figure 13 ​​​As shown, by releasing the axial movement of the sleeve 10, the second opening 1002 reaches above the position of the elastic arm 204 of the guide tube 2, and the elastic arm 204 loses the restriction of the inner wall of the release sleeve 10. The push rod 8 is pushed by the second energy storage element 7, and the elastic arm 204 is pushed out of the engagement part and starts to move from the distal end to the proximal end. The driving mechanism starts to drive the axial movement of the push rod, and the operation is simple and convenient.

[0077] Please refer to Figure 6 and Figure 10 In another embodiment of the present application, an automatic injection device includes a drug carrying assembly and the above-mentioned driving mechanism. The drug carrying assembly includes a drug carrier 13, which is arranged to form a receiving cavity 13.5; a first piston 13.1 and a second piston 13.2, which are arranged in the receiving cavity 13.5 in sequence, and the second piston 13.2 is located on the side of the first piston 13.1 close to the push rod 8, and the first piston 13.1 divides the receiving cavity 13.5 into a first receiving cavity and a second receiving cavity.

[0078] In an embodiment of the present application, as shown in Figure 10 , the drug carrier 13 can use a double-cavity vial assembly. The inner cavity of the double-cavity vial is provided with the first piston 13.1 and the second piston 13.2. The first piston 13.1 is installed at the distal end of the outer convex part 1301, forming a first sealed chamber, i.e. the first receiving cavity, which can contain a lyophilized active substance, such as powder, etc. The second piston 13.2 is arranged at the distal end of the double-cavity vial, forming a second sealed chamber between the two pistons, i.e. the second receiving cavity, which can contain a solvent and a drug solution, etc. The aluminum cover 13.3 and the inner gasket 13.4 of the double-cavity vial assembly press the mouth of the double-cavity vial. The double-cavity vial has good sealing performance and will not cause undesired or premature mixing of the drug solution.

[0079] In an embodiment of the present application, the automatic injection device mixes the powder. When in the mixed 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 receiving cavity and the second receiving cavity are connected, so that the drug solution in the second receiving cavity flows into the first receiving cavity, realizing the mixing of the powder or the complete mixing of the two drug solutions. In other embodiments, other structures of the drug carrier can also be used for mixing the drug solution before injection. In an embodiment of the present application, the drug carrier assembly can realize the mixing of the drug solution before injection, so that it will not cause undesired or premature mixing of the drug solution.

[0080] Please refer to Figure 10 and Figure 14 , the drug carrier 13 includes an outer convex part 1301. In an embodiment of the present application, as shown in Figure 15As shown, the medicine carrier 13 adopts a double-cavity vial, which has an outer protrusion 1301. In the initial state, the first piston 13.1 is located at the outer protrusion 1301 towards the distal side. In the mixing state, the first piston 13.1 moves to the outer protrusion 1301, and the first piston 13.1 forms a communication port (not shown in the figure) with the inner wall of the medicine carrier 13, so that the first accommodation cavity or the second accommodation cavity is communicated, and the liquid medicine in the second accommodation cavity flows into the first accommodation cavity through the communication port, thereby realizing the mixing of the powder or the complete mixing of the two liquid medicines. In another embodiment, the double-cavity vial can also be provided with an inner protrusion, and the first piston 13.1 is provided with a recess. When the recess and the inner protrusion are matched, the recess and the inner protrusion are separated, and the recess of the first piston 13.1 forms a communication port with the inner wall of the container. The inner wall of the corresponding protective sleeve 11 is provided with another matching part, which is embedded with the inner protrusion, so as to achieve the effect of fixing the medicine carrier 13 and driving the medicine carrier 13 to move axially. In other embodiments, other structures of medicine carriers can also be used to realize the mixing of the liquid medicine before injection.

[0081] Please refer to Figure 10 and Figure 16 In the embodiment of the present application, the driving mechanism further comprises a housing 1, a protective sleeve 11 and a stop ring 12. The housing 1 is sleeved on the outer periphery of the rotor 4, and the guide pipe 2 and the release sleeve 10 are located inside the housing 1. One end of the protective sleeve 11 is in contact with the proximal end of the housing 1. In the embodiment of the present application, the distal end of the protective sleeve 11 is provided with a first clamping hole 1103. The outer wall of the stop ring 12 is provided with two third elastic clamping hooks 1201 and a fastener 1202. The fastener 1202 is embedded in the distal end of the straight groove 1102 of the protective sleeve 11, and the third elastic clamping hook 1201 is buckled in the first clamping hole 1103 of the protective sleeve 11, thereby limiting the axial movement of the medicine carrier 13, ensuring its sealing, and preventing the mixing of the liquid medicine from being caused unexpectedly or prematurely. In another embodiment, the fourth elastic clamping hook of the protective sleeve 11 can be buckled with the second clamping hole of the stop ring, and the inner protrusion of the protective sleeve 11 and the notch of the stop ring can be matched and fixed. Other fixing structures can also be provided, so that the medicine carrier 13 can only move axially and cannot rotate circumferentially. Thus, the stability and reliability of the driving mechanism are improved.

[0082] Please refer to Figure 17 In another embodiment of the present application, an automatic injection method is also provided, which uses the automatic injection device described above, comprising:

[0083] In S210, the medicine carrier 13 receives the force from the proximal end to the distal end, so that the medicine carrier 13 moves axially relative to the push rod 8 from the proximal end to the distal end, thereby driving the push rod 8 to push the second piston 13.2 to move axially, so as to drive the first piston 13.1 to move synchronously, so that the first accommodation cavity and the second accommodation cavity are communicated.

[0084] In the embodiment of the present application, when the automatic injection device is in the initial state, as shown in FIG. 1, the drug carrier 13 can ensure the sealing property and will not cause undesired or premature mixing of the drug solution, and the driving mechanism is in the unstarted state. Figure 10

[0085] In the embodiment of the present application, the protective sleeve 11 is screwed with the housing 1, when the automatic injection device is in the mixing state, the protective sleeve 11 is rotated to move axially from the proximal end to the distal end, so as to apply a force from the proximal end to the distal end to the drug carrier 13, the drug carrier 13 moves axially from the proximal end to the distal end relative to the push rod 8, so as to make the push rod 8 push the second piston 13.2 to move axially, since the drug carrier 13 is in the sealed state, the movement of the second piston 13.2 makes the pressure in the second accommodating cavity increase, the first piston 13.1 and the second piston 13.2 are synchronously moved by the pressure in the second accommodating cavity. When the first piston 13.1 moves to the outer protrusion 1301, the first piston 13.1 and the outer protrusion 1301 form a gap to form a communication port, the pressure in the second accommodating cavity decreases, so as to make the first piston 13.1 stop moving, the second piston 13.2 continues to be pushed by the push rod 8 to make the drug solution in the second accommodating cavity flow into the first accommodating cavity through the outer protrusion 1301, so as to realize the mixing of the powder or the complete mixing of the two drug solutions, and the automatic injection device is in the completely mixed state, as shown in FIG. 4. Figure 14

[0086] 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 as to make the third opening 401 of the rotor 4 form a cross port with the first opening 210 of the guide tube 2.

[0087] In the above-mentioned rotation of the protective sleeve 11 to move axially from the proximal end to the distal end, the distal end of the protective sleeve 11 can abut against the rotor 4 to push the rotor 4 to move axially to the distal end. In the embodiment of the present application, when the distal end surface of the protective sleeve 11 contacts with the proximal end surface of the limiting ring 9, the protective sleeve 11 cannot continue to rotate to move to the distal end. When the automatic injection device is in the completely mixed state, as shown in FIG. 4, the third opening 401 of the rotor 4 moves to the upper side of the first opening 210 of the guide tube 2 to form a cross port with the first opening 210. Figure 14

[0088] S230, the distal end of the release sleeve 10 receives the force from the distal end to the proximal end, so as to make the release sleeve 10 move axially to the proximal end, so as to make the first elastic clamping hook 1001 of the release sleeve 10 move to the cross port, the first elastic clamping hook 1001 of the release sleeve 10 pops towards the cross port, so as to make the guide tube 2 release the axial limiting of the release sleeve 10;

[0089] ​​​In the embodiment of the present application, the second boss 1004 at the distal end of the pressing release sleeve 10 exerts a force on the release sleeve 10 from the distal end to the proximal end, so that the release sleeve 10 moves axially. After the first elastic hook 1001 of the release sleeve 10 moves to the intersection, it continues to move to the intersection and pops out, so that the first elastic hook 1001 can slide on the outer wall of the guide tube 2, thereby releasing the axial positioning of the release sleeve 10 by the guide tube 2, and the automatic injection device is in a released state, as shown in Figure 18 .

[0090] S240, the second opening 1002 of the release sleeve 10 reaches the position of the elastic arm 204, the outer elastic arm 204 releases the axial positioning 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.

[0091] In the embodiment of the present application, after the first elastic hook 1001 pops out of the intersection, the guide tube 2 releases the axial positioning of the release sleeve 10, and the release sleeve 10 continues to move axially to the proximal end. 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 from the distal end to the proximal end, and the sound emitting assembly provides kinetic energy through the reset of the third energy storage element 3 to prompt the user about the stage of the injection. In other embodiments, the first elastic hook 1001 can reach the intersection and the second opening 1002 can reach the position of the elastic arm 204 at the same time. When the automatic injection device is in a completely released state, as shown in Figure 19 , the injection is completed.

[0092] The driving mechanism of the embodiment of the present application can be divided into two stages which are independent of each other and have a certain correlation. In the first stage, the automatic injection device can be in a mixed state, so that the drugs in the first accommodating cavity and the second accommodating cavity are fully mixed. The mixing time of the drugs can be controlled as needed to improve the mixing effect of the drugs. In the second stage, the distal end of the release sleeve 10 can be directly or indirectly pressed to start the automatic injection function of the injection device. At the same time, only after the first stage is started, the second stage can be started to avoid misoperation. The driving mechanism of the embodiment of the present application can be applied to the automatic injection device to realize the mixing and automatic injection of the drugs, so that the application scenarios are more extensive. The driving mechanism and the automatic injection device of the present application make the operation simple, the drugs mixed uniformly, safe and reliable, and convenient for patients to inject themselves, achieving home use and self-administration.

[0093] In the automatic injection device of the embodiment of the application, the second boss 1004 corresponds to an injection button, a needle for an injection pen is screwed in use, the protective sleeve 11 is rotated, the liquid medicine is automatically mixed, and the injection function is automatically unlocked. The needle pierces the skin, the injection button is pressed, and the automatic injection is completed; the sound, visual and tactile feedback functions are provided to prompt the patient about the stage at which the injection is at. The automatic injection device is suitable for self-administration by non-professionals and use in emergency situations and complex environmental conditions.

[0094] The above description is merely an embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent process transformation using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A drive mechanism for an injection device, characterized in that, The drive mechanism includes: Pusher (8); The guide tube (2) is coaxially housed within the guide tube (2). The guide tube (2) is provided with an elastic arm (204) and a first opening (210). The elastic arm (204) is used to limit the axial movement of the push rod (8). Release sleeve (10), which is coaxially nested in the outer wall of the guide tube (2). The release sleeve (10) is provided with a second opening (1002) and a first elastic hook (1001). The first elastic hook (1001) cooperates with the first opening (210) of the guide tube (2) so that the distal end of the first opening (210) of the guide tube (2) prevents the release sleeve (10) from moving to the distal end. The proximal end is the end close to the injection end, and the distal end is the end away from the injection end. The rotor (4) is nested in the outer wall of the release sleeve (10) to limit the radial movement of the first elastic hook (1001). The rotor (4) is provided with a third opening (401). The third opening (401) is used to pop out toward the third opening (401) when it intersects with the first opening (210) and when the first elastic hook (1001) moves to the intersection position, so that the guide tube (2) releases the axial restriction on the release sleeve (10); the second opening (1002) reaches the position of the elastic arm (204), and the elastic arm (204) pops out to release the axial restriction on the push rod (8), and the push rod (8) moves from the distal end to the proximal end; The rotor (4) includes a second elastic hook (402), and a first boss (206) is provided at the proximal end of the guide tube (2). The second elastic hook (402) cooperates with the first boss (206) to limit the axial movement of the rotor (4) and the first boss (206), so that when the force on the release sleeve (10) from the distal end to the proximal end is less than a preset force, the release sleeve (10) and the rotor (4) are relatively stationary.

2. The driving mechanism according to claim 1, characterized in that, The inner wall of the rotor (4) is provided with an axially extending sliding groove (403), and the outer wall of the release sleeve (10) is provided with an axially extending first positioning protrusion (1006), or... The inner wall of the rotor (4) is provided with an axially extending protrusion, and the outer wall of the release sleeve (10) is provided with an axially extending sliding groove. The sliding groove (403) engages with the first positioning protrusion (1006) to limit the circumferential rotation of the rotor (4) and the release sleeve (10).

3. The drive mechanism according to any one of claims 1 or 2, characterized in that, Also includes: The outer casing (1) is fitted around the outer periphery of the rotor (4), and the guide tube (2) and the release sleeve (10) are located inside the outer casing (1); A protective sleeve (11), one end of which is connected to the proximal end of the outer shell (1).

4. The driving mechanism according to claim 3, characterized in that, The guide tube (2) is provided with an installation hook (207), and the outer shell (1) is provided with a limiting port. The installation hook (207) is engaged with the limiting port to limit the axial and circumferential movement of the guide tube (2) and the outer shell (1).

5. The driving mechanism according to claim 3, characterized in that, The protective sleeve (11) is screwed to the outer shell (1), and when the protective sleeve (11) moves to the far end relative to the outer shell (1), the protective sleeve (11) abuts against the end face of the rotor (4) and pushes the rotor (4) to move axially to the far end, so that the third opening (401) of the rotor (4) and the first opening (210) intersect.

6. The driving mechanism according to claim 3, characterized in that, Also includes: A limiting ring (9) is fastened to the guide tube (2) to limit the position of the protective sleeve (11) relative to the outer shell (1) as it moves to the far end.

7. The driving mechanism according to claim 1, characterized in that, include: A circumferential limiting component is disposed on the guide tube (2) and the release sleeve (10) to limit the circumferential rotation of the guide tube (2) and the release sleeve (10).

8. The driving mechanism according to claim 1, characterized in that, The outer wall of the push rod (8) includes a locking part, which forms an axial limiting assembly with the elastic arm (204).

9. The driving 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 also includes: The first energy storage element (5) is arranged around the outer 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 abuts against the second boss (1004) to give the rotor (4) a force from the distal end toward the proximal end.

10. The driving mechanism according to claim 1, characterized in that, It also includes a second energy storage element (7), which is used to apply force to the push rod (8) so that the push rod (8) is disengaged from the guide tube (2) when the second energy storage element (7) recovers its elasticity.

11. The driving mechanism according to claim 10, characterized in that, The push rod (8) is provided with a first inner hole with one end open. The end of the first inner hole facing away from the opening is a first end face. The second energy storage element (7) is disposed in the first inner hole, such that one end of the second energy storage element (7) abuts against the first end face, and the other end abuts against the inner end face inside the guide tube (2).

12. The driving mechanism according to claim 11, characterized in that, It also includes a guide (201) disposed in the first inner hole, such that the second energy storage element (7) is sleeved on the guide (201) to limit the second energy storage element (7) to provide force along the axial direction.

13. The driving mechanism according to claim 11, characterized in that, The drive mechanism also includes: The sound-generating component includes a sound-generating ring (6) and a third energy storage element (3). The sound-generating ring (6) and the third energy storage element (3) are nested with the push rod (8). The third energy storage element (3) is used to provide kinetic energy for the sound-generating ring (6) to rotate around the axis of the push rod (8). The sound-generating ring (6) generates a prompting sound during the movement.

14. An automatic injection device, characterized in that, It includes a drug-carrying component and a driving mechanism, wherein the driving mechanism includes: The rotor (4) is nested on the outer wall of the release sleeve (10) to limit the radial movement of the first elastic hook (1001) of the release sleeve (10). The rotor (4) is provided with a third opening (401). The third opening (401) is used to pop out toward the third opening (401) when it intersects with the first opening (210) of the guide tube (2) and when the first elastic hook (1001) moves to the intersection position, so that the guide tube (2) releases the axial restriction on the release sleeve (10). 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) pops out to release the axial restriction on the push rod (8). Moving from the distal end to the proximal end, wherein the proximal end is the end closer to the injection end and the distal end is the end farther from the injection end; the rotor (4) includes a second elastic hook (402), and the proximal end of the guide tube (2) is provided with a first boss (206). The second elastic hook (402) cooperates with the first boss (206) to limit the axial movement of the rotor (4) and the first boss (206), so that when the force on the release sleeve (10) from the distal end to the proximal end is less than a preset force, the release sleeve (10) and the rotor (4) are relatively stationary; The drug carrier component includes: A drug carrier (13) is provided to form a receiving cavity (13.5). The first piston (13.1) and the second piston (13.2) are sequentially disposed in the accommodating cavity. The second piston (13.2) is located on the side of the first piston (13.1) near the push rod (8). The first piston (13.1) divides the accommodating cavity into a first accommodating cavity and a second accommodating cavity. The drug carrier (13) moves axially from the proximal end to the distal end relative to the push rod (8), thereby causing the push rod (8) to push the second piston (13.2) to move axially, so as to drive the first piston (13.1) to move synchronously, and to make the first accommodating cavity and the second accommodating cavity connected.

15. The automatic injection device according to claim 14, characterized in that, The automated injection device also includes: Pusher (8); The guide tube (2) is coaxially housed within the guide tube (2). The guide tube (2) is provided with the elastic arm (204) and the first opening (210). The elastic arm (204) is used to limit the axial movement of the push rod (8). Release sleeve (10), which is coaxially nested on the outer wall of the guide tube (2), is provided with a second opening (1002) and a first elastic hook (1001). The first elastic hook (1001) cooperates with the first opening (210) of the guide tube (2) so that the distal end of the first opening (210) of the guide tube (2) prevents the release sleeve (10) from moving to the distal end.

16. The automatic injection device according to claim 14 or 15, characterized in that, The drug carrier (13) includes an outward protrusion (1301). In the initial state, the first piston (13.1) is located on the side of the outward protrusion (1301) facing the distal end. When the first piston (13.1) moves to the outward protrusion (1301), the first piston (13.1) forms a communication port with the inner wall of the drug carrier (13) so that the first accommodating cavity or the second accommodating cavity is connected.

17. The automatic injection device according to claim 16, characterized in that, The drive mechanism also includes a housing (1) and a protective sleeve (11). The housing is fitted around the outer 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 connected to the proximal end of the housing (1). The drug carrier (13) is fixed to the protective sleeve (11) by the protrusion, so that the axial movement of the protective sleeve (11) drives the axial movement of the drug carrier (13).

18. The automatic injection device according to claim 14, characterized in that, The inner wall of the rotor (4) is provided with an axially extending sliding groove (403), and the outer wall of the release sleeve (10) is provided with an axially extending first positioning protrusion (1006), or... The inner wall of the rotor (4) is provided with an axially extending protrusion, and the outer wall of the release sleeve (10) is provided with an axially extending sliding groove. The sliding groove (403) engages with the first positioning protrusion (1006) to limit the circumferential rotation of the rotor (4) and the release sleeve (10).

19. The automatic injection device according to claim 17, characterized in that, The guide tube (2) is provided with an installation hook (207), and the outer shell (1) is provided with a limiting port. The installation hook (207) is engaged with the limiting port to limit the axial and circumferential movement of the guide tube (2) and the outer shell (1).

20. The automatic injection device according to claim 17, characterized in that, The protective sleeve (11) is screwed to the outer shell (1), and when the protective sleeve (11) moves to the far end relative to the outer shell (1), the protective sleeve (11) abuts against the end face of the rotor (4) and pushes the rotor (4) to move axially to the far end, so that the third opening (401) of the rotor (4) and the first opening (210) intersect.

21. The automatic injection device according to claim 17, characterized in that, Also includes: A limiting ring (9) is fastened to the guide tube (2) to limit the position of the protective sleeve (11) relative to the outer shell (1) as it moves to the far end.

22. The automatic injection device according to claim 15, characterized in that, The drive mechanism also includes: A circumferential limiting component is disposed on the guide tube (2) and the release sleeve (10) to limit the circumferential rotation of the guide tube (2) and the release sleeve (10).

23. The automatic injection device according to claim 17, characterized in that, The outer wall of the push rod (8) includes a locking part, which forms an axial limiting assembly with the elastic arm (204).

24. The automatic injection device according to claim 15, characterized in that, The outer wall of the release sleeve (10) is provided with a second boss (1004). The drive mechanism also includes: The first energy storage element (5) is arranged around the outer 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 abuts against the second boss (1004) to give the rotor (4) a force from the distal end toward the proximal end.

25. The automatic injection device according to claim 15, characterized in that, It also includes a second energy storage element (7), which is used to apply force to the push rod (8) so that the push rod (8) is disengaged from the guide tube (2) when the second energy storage element (7) recovers its elasticity.

26. The automatic injection device according to claim 25, characterized in that, The push rod (8) is provided with a first inner hole with one end open. The end of the first inner hole facing away from the opening is a first end face. The second energy storage element (7) is disposed in the first inner hole, such that one end of the second energy storage element (7) abuts against the first end face, and the other end abuts against the inner end face inside the guide tube (2).

27. The automatic injection device according to claim 26, characterized in that, The drive mechanism further includes a guide (201) disposed in the first inner hole, such that the second energy storage element (7) is sleeved on the guide (201) to limit the second energy storage element (7) to provide force along the axial direction.

28. The automatic injection device according to claim 26, characterized in that, The drive mechanism also includes: The sound-generating component includes a sound-generating ring (6) and a third energy storage element (3). The sound-generating ring (6) and the third energy storage element (3) are nested with the push rod (8). The third energy storage element (3) is used to provide kinetic energy for the sound-generating ring (6) to rotate around the axis of the push rod (8). The sound-generating ring (6) generates a prompting sound during the movement.

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