Injection driving mechanism and automatic injection device

Abstract

The invention discloses an injection driving mechanism and an automatic injection device, and relates to the technical field of automatic injectors. The injection driving mechanism comprises a guide pipe, a push rod, a release sleeve and a third energy storage element, the guide pipe is nested in the release sleeve, and the third energy storage element is arranged on the periphery of the release sleeve. An elastic arm of the guide pipe is matched with a clamping part of the push rod to form a limiting assembly, a stop piece is arranged on the side, close to the near end, of the guide pipe, the side, close to the far end, of the stop piece is arranged to be a vertical face, the release sleeve is provided with a limiting groove, and the third energy storage element enables the side, away from the near end, of the limiting groove to abut against the vertical face; the vertical face of the stopper blocks proximal movement of the release sleeve. Meanwhile, the elastic arm of the guide pipe is pressed by the sleeve wall of the release sleeve, and the elastic arm is pressed against the clamping part of the push rod to position the push rod, so that the injection driving mechanism cannot be released automatically, and self-locking is realized.

Description

[0001] This application is a divisional application of the patent application with the application number 202211485881.1 (the filing date of the original application is November 24, 2022, and the invention title is Sound Feedback Mechanism, Injection Driving Mechanism and Automatic Injection Device). Technical Field

[0002] The present invention relates to the technical field of automatic syringes, and in particular to an injection driving mechanism and an automatic injection device. Background Art

[0003] An automatic syringe is used to infuse a liquid medicine into the body of a person receiving an injection. The automatic syringe includes an injection mechanism for containing the liquid medicine. One end of the injection mechanism is provided with an injection needle, and the other end is provided with a piston. At the end of the piston away from the injection needle, an injection driving mechanism is arranged. The injection driving mechanism is used to drive the piston to complete the pushing action of the automatic syringe on the liquid medicine. The injection operation of the automatic syringe is usually completed independently by the person receiving the injection. Therefore, how to improve the convenience of operation and achieve better prompting during the injection process is very important for the person receiving the injection to pay attention to the injection process in real time.

[0004] The structure of the injection driving mechanism of the existing automatic injection device is complex, and the operation convenience is poor; and the injection driving mechanism usually cannot exist independently of the automatic injection device. The injection driving mechanism in the existing technology must rely on external force to assemble all components together. When the external force is removed, the injection driving mechanism cannot be assembled independently, which is disadvantageous for the manufacturers of the medicine and the automatic injection device respectively. In addition, usually there are multi-dimensional feedbacks during the injection process, such as: auditory, visual and tactile. The person receiving the injection can control the entire injection process by obtaining the feedback signal. However, most of the multi-dimensional feedbacks in the existing technology are completed by electronic components. Therefore, the automatic syringe needs to be powered by its own battery, and the electronic components are easily affected by the environment, are prone to aging, are not easy to store for a long time, and it is difficult to ensure the stability and reliability of the automatic syringe; moreover, the cost is relatively high. Summary of the Invention

[0005] The purpose of the present invention is to provide an injection driving mechanism and an automatic injection device. By applying the injection driving mechanism and the automatic injection device, the convenience of the assembly operation can be improved, the person receiving the injection can fully control the assembly process and the injection process, and at the same time the cost can be reduced.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] An injection driving mechanism for an automatic injection device, comprising a guide tube, a push rod, a release sleeve and a third energy storage element. The guide tube is nested in the release sleeve, and the third energy storage element is arranged on the outer periphery of the release sleeve; wherein:

[0008] The elastic arm of the guide tube cooperates with the engaging portion of the push rod to form a limiting component. A stop is provided on the proximal side of the guide tube. The side of the stop near the distal end is a vertical surface. The release sleeve is provided with a limiting groove. The third energy storage element causes the side of the limiting groove away from the proximal end to abut against the vertical surface, and the vertical surface of the stop blocks the release sleeve from moving proximally. At the same time, the elastic arm of the guide tube is pressed by the wall of the release sleeve, and the elastic arm abuts against the engaging portion of the push rod to position the push rod, so that the injection driving mechanism cannot be self-released, achieving self-locking.

[0009] As an alternative embodiment of the injection driving mechanism, the guide tube is provided with a first fixing ring, the release sleeve is provided with a second fixing ring, one end of the third energy storage element abuts against the first fixing ring, and the other end abuts against the second fixing ring.

[0010] As an alternative embodiment of the injection driving mechanism, the release sleeve is provided with a release port, the limiting groove is provided between the release port and the second fixing ring, and the stop abuts against one end of the limiting groove to limit the first extreme position of the release sleeve; the stop abuts against the other end of the limiting groove to limit the second extreme position of the release sleeve.

[0011] As an alternative embodiment of the injection driving mechanism, the engaging portion includes an engaging ring and an engaging block. The engaging ring is provided on the outer periphery of the push rod, and the engaging ring and the engaging block are arranged at intervals along the axial direction of the push rod. The elastic arm is clamped between the engaging ring and the engaging block.

[0012] As an alternative embodiment of the injection driving mechanism, the inner wall of the guide tube is provided with a first sliding groove, and the engaging block moves along the first sliding groove to limit the rotation of the push rod.

[0013] As an alternative embodiment of the injection driving mechanism, the push rod includes a central hole with an open end, and a second energy storage element is arranged in the central hole; one end of the guide tube has an end face, one end of the second energy storage element abuts against the end face of the guide tube, and the other end abuts against the bottom of the central hole.

[0014] As an alternative embodiment of the injection driving mechanism, the injection driving mechanism further includes a bottom cover. A guide rod is provided at the center of the bottom cover. The bottom cover is fixedly connected to the guide tube. The guide rod can enter the central hole, and the second energy storage element is sleeved on the guide rod.

[0015] As an alternative embodiment of the injection driving mechanism, a hook is provided on the bottom cover, and the hook is clamped with the first fixing ring to fix the bottom cover and the guide tube.

[0016] As an alternative embodiment of the injection driving mechanism, the injection driving mechanism further includes a limiting ring disposed at one end of the guiding tube away from the end face, and the limiting ring is used to limit the extreme position of the push rod.

[0017] As an alternative embodiment of the injection driving mechanism, the guiding tube is provided with a third fixing hole, and the limiting ring is provided with a limiting hook, and the limiting hook cooperates with the third fixing hole to fix the limiting ring to the guiding tube.

[0018] As an alternative embodiment of the injection driving mechanism, the limiting ring includes a limiting arm. The push rod moves from the distal end to the proximal end, driving the engaging ring to move to abut against the side of the limiting arm away from the proximal end to limit the extreme position of the push rod.

[0019] As an alternative embodiment of the injection driving mechanism, the limiting hook is disposed on the limiting arm and penetrates through the limiting arm. A second sliding groove is provided on the inner side of the limiting arm, and the second sliding groove extends from the end of the limiting arm away from the proximal end to the limiting hook. There are two engaging blocks, and a pressing block is disposed between the two engaging blocks. When the push rod moves, it drives the pressing block to move to abut against the limiting hook, so as to limit the high-speed movement of the push rod and prevent the limiting hook from breaking out of the third fixing hole.

[0020] As an alternative embodiment of the injection driving mechanism, the inner wall of the release sleeve is provided with a first limiting groove, and the outer periphery of the guiding tube is provided with a first limiting protrusion. The first limiting protrusion cooperates with the first limiting groove to limit the relative rotation between the release sleeve and the guiding tube.

[0021] An injection driving mechanism for an automatic injection device. The automatic injection device includes a protective sleeve and a housing. The injection driving mechanism includes a guiding tube, a push rod and a release sleeve. Among them, the elastic arm of the guiding tube cooperates with the engaging portion of the push rod to form a limiting assembly. The release sleeve is provided with a release port. One end of the protective sleeve extending into the housing contacts the release sleeve. When the injection driving mechanism is not released, the elastic arm abuts against the engaging portion to position the push rod. When the protective sleeve moves axially to drive the release sleeve to move axially, when the release port reaches the position of the elastic arm, the elastic arm springs outwards and separates from the engaging portion, the guiding tube releases the limit on the push rod, and the push rod moves from the distal end to the proximal end, and the injection driving mechanism is released. The proximal end is the end close to the person receiving the injection.

[0022] As an alternative embodiment of the injection driving mechanism, a third energy storage element is provided on the outer periphery of the release sleeve. The guide tube is provided with a first fixing ring, and the release sleeve is provided with a second fixing ring. One end of the third energy storage element abuts against the first fixing ring, and the other end abuts against the second fixing ring.

[0023] As an alternative embodiment of the injection driving mechanism, the engaging portion includes an engaging ring and an engaging block. The engaging ring is provided on the outer periphery of the push rod. The engaging ring and the engaging block are arranged at intervals along the axial direction of the push rod, and the elastic arm is clamped between the engaging ring and the engaging block.

[0024] As an alternative embodiment of the injection driving mechanism, a first sliding groove is provided on the inner wall of the guide tube, and the engaging block moves along the first sliding groove to limit the rotation of the push rod.

[0025] As an alternative embodiment of the injection driving mechanism, the push rod includes a central hole with an open end, and a second energy storage element is arranged in the central hole; one end of the guide tube has an end face, one end of the second energy storage element abuts against the end face of the guide tube, and the other end abuts against the bottom of the central hole.

[0026] As an alternative embodiment of the injection driving mechanism, the injection driving mechanism further includes a bottom cover. A guide rod is provided at the center of the bottom cover. The bottom cover is fixedly connected to the guide tube. The guide rod can enter the central hole, and the second energy storage element is sleeved on the guide rod.

[0027] As an alternative embodiment of the injection driving mechanism, a hook is provided on the bottom cover, and the hook is clamped with the first fixing ring to fix the bottom cover and the guide tube.

[0028] As an alternative embodiment of the injection driving mechanism, a stopper is provided on one side of the guide tube close to the proximal end. A limiting groove is provided on the release sleeve. The limiting groove is arranged between the release port and the second fixing ring. The stopper abuts against one end of the limiting groove to limit the first extreme position of the release sleeve; the stopper abuts against the other end of the limiting groove to limit the second extreme position of the release sleeve.

[0029] As an alternative embodiment of the injection driving mechanism, the injection driving mechanism further includes a limiting ring. The limiting ring is arranged at one end of the guide tube away from the end face, and the limiting ring is used to limit the extreme position of the push rod.

[0030] As an alternative embodiment of the injection driving mechanism, a third fixing hole is provided on the guiding tube, and a limiting hook is provided on the limiting ring. The limiting hook cooperates with the third fixing hole to fix the limiting ring to the guiding tube.

[0031] As an alternative embodiment of the injection driving mechanism, the limiting ring includes a limiting arm. The push rod moves from the distal end towards the proximal end, driving the engaging ring to move until it abuts against the side of the limiting arm away from the proximal end, thereby restricting the extreme position of the push rod.

[0032] As an alternative embodiment of the injection driving mechanism, the limiting hook is provided on the limiting arm and penetrates through the limiting arm. A second sliding groove is provided on the inner side of the limiting arm, extending from the end of the limiting arm away from the proximal end to the limiting hook. There are two engaging blocks, and a pressing block is provided between the two engaging blocks. When the push rod moves, it drives the pressing block to abut against the limiting hook, thereby restricting the high-speed movement of the push rod to prevent the limiting hook from breaking out of the third fixing hole.

[0033] As an alternative embodiment of the injection driving mechanism, a first limiting groove is provided on the inner wall of the release sleeve, and a first limiting protrusion is provided on the outer periphery of the guiding tube. The first limiting protrusion cooperates with the first limiting groove to restrict the relative rotation of the release sleeve and the guiding tube.

[0034] An automatic injection device, comprising a housing, an injection mechanism, and an injection driving mechanism as described in any of the above embodiments. The injection mechanism and the injection driving mechanism are both disposed within the housing, and the injection mechanism is installed at one end of the injection driving mechanism close to the proximal end.

[0035] As an alternative embodiment of the automatic injection device, a second limiting protrusion is provided at one end of the release sleeve close to the proximal end, and a second limiting groove is provided on the inner wall of the housing. The second limiting protrusion cooperates with the second limiting groove to restrict the rotation of the release sleeve.

[0036] An automatic injection device, which includes a protective sleeve, an outer shell, a sound feedback mechanism, and an injection driving mechanism as described in any of the above embodiments. Among them,

[0037] The sound - generating feedback mechanism includes a sound - generating ring, a first energy - storing element in an energy - storing state, and a sound - generating feedback component. The first energy - storing element in the energy - storing state provides kinetic energy for the sound - generating ring. The sound - generating feedback component includes a guiding surface and a terminating surface. The guiding surface includes a first abutting surface, a second abutting surface, and an inclined surface located between the first abutting surface and the second abutting surface. During the movement of the sound - generating ring, when it moves from the mounting surface of the guiding tube to the first abutting surface, a starting prompt sound is generated. When the sound - generating ring moves on the inclined surface and drives the sound - generating ring to rotate, the first energy - storing element in the energy - storing state can continue to store energy. When the sound - generating ring reaches the second abutting surface, the energy - storage of the first energy - storing element ends, and the second abutting surface can prevent the sound - generating ring from rotating. When the sound - generating ring moves from the second abutting surface to the terminating surface, a terminating prompt sound is generated.

[0038] As an alternative solution of the automatic injection device, a plurality of the guiding surfaces are sequentially arranged on the tube wall of the guiding tube between the mounting surface and the terminating surface. During the working process, the sound - generating ring impacts and generates sound with each guiding surface in sequence to generate continuous signal feedback.

[0039] Advantages of the present invention:

[0040] The automatic injection device provided by the present invention exerts a force from the proximal end to the distal end on the release sleeve of the injection driving mechanism. Through the cooperation between the elastic arm of the guiding tube and the engaging portion of the push rod, a limiting component is formed. When the protective sleeve is axially moved under force and drives the release sleeve to move to a position where the elastic arm is located at the release opening of the release sleeve, the elastic arm springs outwards and separates from the engaging portion, so that the guiding tube releases the restriction on the axial movement of the push rod. The push rod moves from the distal end to the proximal end to drive the piston of the automatic injection device to move, thereby completing the pushing of the liquid medicine. This injection driving mechanism has a simple structure and is more convenient to operate. The first energy - storing element in the energy - storing state provides kinetic energy for the rotation of the sound - generating ring, so that when the sound - generating ring moves from the distal end to the proximal end, the first energy - storing element in the energy - storing state stores energy and drives the sound - generating ring to rotate. At the beginning of the injection, the sound - generating ring impacts the first abutting surface to generate a starting prompt sound; at the end of the injection, the sound - generating ring impacts the terminating surface to generate a terminating prompt sound, effectively preventing the person receiving the injection from misjudging the injection process and causing harm during the injection process. Moreover, this injection driving mechanism does not require the use of electronic components, reducing the influence of the external environment on the feedback sound of the sound - generating feedback mechanism, improving the reliability and stability of the sound - generating feedback mechanism, and reducing the cost at the same time.

[0041] Multiple guiding surfaces can also be arranged along the inner wall of the guiding tube from the distal end to the proximal end. As the push rod is released and moves from the distal end to the proximal end, the recipient can hear a prompt sound at regular intervals during the injection process. When the prompt sound can no longer be heard, it indicates that the injection is completed. The arrangement of multiple guiding surfaces enables the automatic injection device to continuously emit sounds during the injection process, which has a more significant prompting effect on the elderly with dull reactions and recipients with hearing impairments. The continuous sound can continuously remind the recipient of the injection progress. Even if the second "click" impact sound is missed, the recipient can still hear continuous sounds during the subsequent injection process until the last "click" impact sound ends and no more impact sounds are heard, indicating that the injection is completed, preventing the recipient from misjudging the injection process and causing harm during the injection process.

[0042] During the injection process, obvious starting and ending prompt sounds can be emitted, which not only enables the recipient to accurately grasp the injection progress, but also has a more significant prompting effect on the elderly with dull reactions and recipients with hearing impairments; it reduces the influence of the external environment on the feedback sound of the sound feedback mechanism, improves the reliability and stability of the sound feedback mechanism, and reduces the cost at the same time. Brief Description of the Drawings

[0043] Figure 1 is a longitudinal sectional view of the automatic injection device provided in Embodiment 1 of the present invention;

[0044] Figure 2 is a schematic structural diagram of the injection driving mechanism provided in Embodiment 1 of the present invention;

[0045] Figure 3 is an exploded view of the injection driving mechanism provided in Embodiment 1 of the present invention;

[0046] Figure 4 is a longitudinal sectional view of the injection driving mechanism in the initial state provided in Embodiment 1 of the present invention;

[0047] Figure 5 is a longitudinal sectional view of the injection driving mechanism in the released state provided in Embodiment 1 of the present invention;

[0048] Figure 6 is a schematic structural diagram of the release sleeve provided in Embodiment 1 of the present invention;

[0049] Figure 7 is a schematic structural diagram of the guiding tube provided in Embodiment 1 of the present invention Figure 1 ;

[0050] Figure 8 is Figure 7 the sectional view taken along line A-A in

[0051] Figure 9 is a schematic structural diagram of the push rod provided in Embodiment 1 of the present inventionFigure 1 ;

[0052] Figure 10 is a schematic structural view of the push rod provided in the first embodiment of the present invention Figure 2 ;

[0053] Figure 11 is a schematic structural view of the guide tube provided in the first embodiment of the present invention Figure 2 ;

[0054] Figure 12 is a schematic structural view of the bottom cover provided in the first embodiment of the present invention;

[0055] Figure 13 is a schematic structural view of the limiting ring provided in the first embodiment of the present invention;

[0056] Figure 14 is an assembly schematic view of the sounding ring, the first energy storage element in the energy storage state, and the push rod provided in the second embodiment of the present invention;

[0057] Figure 15 is a schematic structural view of the sounding ring provided in the second embodiment of the present invention;

[0058] Figure 16 is a schematic structural view of the guide tube provided in the second embodiment of the present invention Figure 3 ;

[0059] Figure 17 is Figure 16 the sectional view taken along the line B-B in

[0060] Figure 18 is the force diagram of the push rod of the automatic injection device provided in the second embodiment of the present invention during the injection process;

[0061] Figure 19 is the force diagram of the sounding ring of the automatic injection device provided in the second embodiment of the present invention during the injection process;

[0062] Figure 20 is the cross-sectional view of the automatic injection device provided in the second embodiment of the present invention when generating the starting prompt sound;

[0063] Figure 21 is the cross-sectional view of the automatic injection device provided in the second embodiment of the present invention when generating the termination prompt sound.

[0064] In the figure:

[0065] 100, housing; 101, outer shell; 102, protective sleeve;

[0066] 200, injection mechanism; 201, syringe; 202, piston; 203, needle protection cap;

[0067] 1. Guide tube; 11. Installation surface; 12. Guide surface; 121. First abutting surface; 122. Inclined surface; 123. Second abutting surface; 13. Termination surface; 14. Elastic arm; 141. Clamping protrusion; 142. Inclined surface; 15. First chute; 151. First limiting strip; 152. Second limiting strip; 16. First fixing ring; 161. Card slot; 17. Stopper; 18. First limiting protrusion; 19. Third fixing hole;

[0068] 2. Push rod; 21. First limiting part; 22. Second limiting part; 221. Second fixing hole; 23. Engaging ring; 24. Engaging block; 25. Central hole; 26. Pressing block;

[0069] 3. Release sleeve; 31. Release port; 32. Second fixing ring; 321. Second limiting protrusion; 33. Limiting groove; 34. First limiting groove;

[0070] 4. Sound - emitting ring; 41. Protrusion; 411. Sound - emitting feedback surface; 412. First fixing hole;

[0071] 5. First energy - storage element;

[0072] 6. Second energy - storage element;

[0073] 7. Bottom cover; 71. Guide rod; 72. Hook;

[0074] 8. Third energy - storage element;

[0075] 9. Limiting ring; 91. Limiting hook; 92. Second chute. Detailed implementation manners

[0076] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, in which the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions from beginning to end. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention.

[0077] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0078] Unless otherwise clearly defined and limited, the terms "installation", "connection", "attachment", and "fixation" shall be understood in a broad sense. For example, it may be a fixed connection or a detachable connection; it may be a mechanical connection or an electrical connection; it may be a direct connection or an indirect connection through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0079] Unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through other features between them. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature is at a higher horizontal height than the second feature. The first feature being "under", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature is at a lower horizontal height than the second feature.

[0080] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0081] Example 1:

[0082] As Figure 1 shown, this embodiment provides an automatic injection device, including a housing 100, an injection mechanism 200, and an injection driving mechanism. The injection mechanism 200 and the injection driving mechanism are both arranged in the housing 100, and the injection mechanism 200 is installed at one end of the injection driving mechanism close to the proximal end. The proximal end is the end close to the person receiving the injection. The injection mechanism 200 and the injection driving mechanism are coaxially nested together, and the injection mechanism 200 is driven by the injection driving mechanism to inject the liquid medicine.

[0083] The housing 100 includes an outer shell 101 and a protective sleeve 102. The outer shell 101 is fixedly connected to the injection driving mechanism. The protective sleeve 102 is arranged at one end of the outer shell 101 and slides relative to the outer shell 101. The injection mechanism 200 includes a piston 202, a syringe barrel 201, a needle protection cap 203, and the liquid medicine. The piston 202 is arranged between the injection driving mechanism and the syringe barrel 201. The needle protection cap 203 is arranged at one end of the syringe barrel 201 away from the piston 202. The liquid medicine is arranged in the syringe barrel 201; the injection needle can pass through the protective sleeve 102 to contact the skin of the person receiving the injection.

[0084] When using the automatic injection device, the protective sleeve 102 is pressed against the skin surface of the recipient and pressed down with force. The shell 101 moves from the distal end to the proximal end, and the protective sleeve 102 moves from the proximal end to the distal end relative to the shell 101. The injection needle gradually extends out of the protective sleeve 102 and penetrates the skin; at the same time, the end of the protective sleeve 102 away from the proximal end acts on the injection drive mechanism, and the injection drive mechanism is forced to drive the piston 202 to move from the distal end to the proximal end, so as to push the drug solution through the injection needle into the body of the recipient, thereby completing the automatic injection.

[0085] The automatic injection device provided in this embodiment includes a housing, an injection mechanism and the above-mentioned injection drive mechanism, the injection drive mechanism and the injection mechanism are both installed in the housing, the injection mechanism is installed at one end of the injection drive mechanism close to the proximal end, and the injection drive mechanism is used to drive the injection mechanism to push the drug solution. The automatic injection device has a simple structure and is easy to operate, making it more convenient for the recipient to operate.

[0086] like Figures 2 - 13 As shown, this embodiment provides an injection drive mechanism for the above-mentioned automatic injection device, the injection drive mechanism includes a guide tube 1, a push rod 2 and a release sleeve 3, the push rod 2 is arranged in the guide tube 1, the guide tube 1 is nested in the release sleeve 3, the release sleeve 3 is forced to move from the proximal end to the distal end, and the guide tube 1 can release the restriction on the axial movement of the push rod 2, so that the push rod 2 moves from the distal end to the proximal end.

[0087] Specifically, the elastic arm 14 of the guide tube 1 cooperates with the engaging portion of the push rod 2 to form a limiting assembly, the release sleeve 3 is provided with a release port 31, and one end of the protective sleeve 102 extends into the outer shell 101 and contacts the release sleeve 3. When the injection drive mechanism is not released, the elastic arm 14 abuts against the engaging portion to position the push rod 2; the axial movement of the protective sleeve 102 drives the axial movement of the release sleeve 3. When the release port 31 reaches the position of the elastic arm 14, the elastic arm 14 bounces outward and separates from the engaging portion, the guide tube 1 releases the limit on the push rod 2, the push rod 2 moves from the distal end to the proximal end, and the injection drive mechanism is released.

[0088] The injection drive mechanism provided in this embodiment applies a force from the proximal end to the distal end to the release sleeve 3 on the injection drive mechanism, and the elastic arm 14 of the guide tube 1 cooperates with the clamping part of the push rod 2 to form a limit assembly. When the protective sleeve 102 is axially moved by the force and drives the release sleeve 3 to move to the release port 31 of the release sleeve 3 where the elastic arm 14 is located, the elastic arm 14 is outwardly elastic and separated from the clamping part, so that the guide tube 1 releases the restriction on the axial movement of the push rod 2, and the push rod 2 moves from the distal end to the proximal end to drive the piston 202 of the automatic injection device to move, thereby completing the pushing of the liquid medicine. The injection drive mechanism has a simple structure and is more convenient to operate.

[0089] An elastic arm 14 is provided on the tube wall of the guide tube 1. The elastic arm 14 penetrates through the inner and outer walls of the guide tube 1. The engaging portion includes an engaging ring 23 and an engaging block 24. The engaging ring 23 is provided on the outer periphery of the push rod 2. The engaging ring 23 and the engaging block 24 are arranged at intervals along the axial direction of the push rod 2. The elastic arm 14 is engaged between the engaging ring 23 and the engaging block 24 to limit the axial movement of the push rod 2. The elastic arm 14 can pop out through the release port 31 to release the axial movement restriction of the guide tube 1 on the push rod 2. In the initial state, the elastic arm 14 is compressed by the tube wall of the release sleeve 3 and engaged between the engaging ring 23 and the engaging block 24. When the release sleeve 3 is forced to move from the proximal end to the distal end and moves to the position where the release port 31 is above the elastic arm 14, the elastic arm 14 is released through the release port 31, so that the guide tube 1 releases the axial movement restriction on the push rod 2.

[0090] A clamping protrusion 141 is provided at the free end of the elastic arm 14 facing the push rod 2, and the free end of the elastic arm 14 is located at the end of the elastic arm 14 close to the distal end. The clamping protrusion 141 is engaged between the engaging ring 23 and the engaging block 24. In order to facilitate the clamping protrusion 141 to pop out from between the engaging ring 23 and the engaging block 24 when the elastic arm 14 is below the release port 31, an inverted trapezoidal structure is formed between the engaging ring 23 and the engaging block 24. The clamping protrusion 141 is adapted to the inverted trapezoidal structure. The inverted trapezoidal structure is larger at the top and smaller at the bottom, which is convenient for the clamping protrusion 141 to pop out.

[0091] A slope 142 is provided at the end of the clamping protrusion 141 close to the distal end. The slope 142 slopes obliquely upward from the distal end to the proximal end, so that when the release sleeve 3 is reset, the elastic arm 14 can enter the release sleeve 3 again and be compressed by the inner wall of the release sleeve 3 and engaged between the engaging ring 23 and the engaging block 24.

[0092] Both the elastic arm 14 and the engaging block 24 are provided with two. Two clamping blocks are provided on the engaging ring 23. Two engaging portions are formed between the two clamping blocks and the two engaging blocks 24. The two engaging portions are symmetrically arranged and cooperate with the two clamping protrusions 141 respectively to ensure the balanced force on the push rod 2.

[0093] Optionally, a first sliding groove 15 is provided on the inner wall of the guide tube 1. The engaging block 24 moves along the first sliding groove 15 to limit the rotation of the push rod 2. In this embodiment, both the clamping block and the engaging block 24 move along the first sliding groove 15. The first sliding groove 15 is also provided with two. The two first sliding grooves 15 and the two engaging blocks 24 are in one-to-one correspondence and cooperation, so that during the operation of the injection driving mechanism, the push rod 2 can only move along the axial direction.

[0094] First limiting strips 151 and second limiting strips 152 are arranged at intervals on the inner wall of the guide tube 1. A first sliding groove 15 is formed between the first limiting strip 151 and the second limiting strip 152.

[0095] The push rod 2 includes a central hole 25 with one end open, and a second energy storage element 6 is arranged in the central hole 25; one end of the guide tube 1 has an end face, one end of the second energy storage element 6 abuts against the end face of the guide tube 1, and the other end abuts against the bottom of the central hole 25.

[0096] The second energy storage element 6 is a spring. In the initial state, the second energy storage element 6 is in a compressed state. When the elastic arm 14 releases the restriction on the axial movement of the push rod 2, the push rod 2 moves from the distal end to the proximal end under the action of the elastic restoring force of the second energy storage element 6.

[0097] Since the second energy storage element 6 is relatively long, in order to prevent the second energy storage element 6 from being twisted under external force, causing the thrust of the push rod 2 to deviate. As Figure 4 、 Figure 5 and Figure 12 shown, the injection driving mechanism further includes a bottom cover 7. A guide rod 71 is arranged at the center of the bottom cover 7. The bottom cover 7 is fixedly connected to the guide tube 1. The guide rod 71 can enter the central hole 25, and the second energy storage element 6 is sleeved on the guide rod 71. The guide rod 71 provides guidance for the second energy storage element 6 to prevent the second energy storage element 6 from being twisted.

[0098] In this embodiment, the guide rod 71 needs to enter the central hole 25 through the end face of the guide tube 1 with an end face. In order to enable the guide rod 71 to enter the central hole 25, an avoidance hole is provided on the end face of the guide tube 1, and the guide rod 71 passes through the avoidance hole and enters the central hole 25.

[0099] Since the automatic injection device is for single use, in order to reduce costs, the guide tube 1, the push rod 2, the release sleeve 3 and the sound - emitting ring 4 are all made of plastic material, while the guide rod 71 is a steel rod. The setting of the steel rod can prevent the release sleeve 3 from being stressed unevenly during the process of the injection driving mechanism driving the piston 202, causing the guide rod 71 to be skewed, thereby causing the thrust of the push rod 2 to be incorrect and the injection needle to be skewed, which may cause harm to the person receiving the injection. The steel rod is injection - molded at the center of the bottom cover 7.

[0100] One end of the guide tube 1 with an end face is provided with a first fixing ring 16, and a hook 72 is provided on the bottom cover 7. The hook 72 is clamped with the first fixing ring 16 to fix the bottom cover 7 and the guide tube 1. The bottom cover 7 and the guide tube 1 are fixed by clamping. Of course, in other embodiments, the fixing method of the bottom cover 7 and the guide tube 1 is not limited to clamping, and can also be other methods such as plugging or screwing.

[0101] Two hooks 72 are oppositely arranged on the bottom cover 7. A clamping groove 161 is arranged between the first fixing ring 16 and the outer wall of the guide tube 1. The two hooks 72 extend into the clamping groove 161 and hook on the end of the first fixing ring 16 away from the bottom cover 7, so that the hooks 72 are located inside the first fixing ring 16 and are not easily disassembled by mistake, affecting the use of the injection driving mechanism.

[0102] Of course, in other embodiments, the card slot 161 may also be provided on the outer periphery of the first fixing ring 16, and the two hooks 72 are clamped with the first fixing ring 16 from the outside of the first fixing ring 16.

[0103] In addition, the outer surface of the bottom cover 7 is set as an arc surface, and the outer diameter of the arc surface is greater than the maximum outer diameters of the release sleeve 3 and the guide tube 1, so as to cooperate with the housing 101 of the automatic injection device. The setting of the arc surface increases the aesthetics of the automatic injection device; meanwhile, it plays a protective role.

[0104] One end of the release sleeve 3 is provided with a second fixing ring 32. A third energy storage element 8 is arranged on the outer periphery of the release sleeve 3. One end of the third energy storage element 8 abuts against the first fixing ring 16, and the other end abuts against the second fixing ring 32. The third energy storage element 8 is a spring. The third energy storage element 8 is sleeved on the outer periphery of the release sleeve 3, which is convenient for the release sleeve 3 to reset when not stressed.

[0105] As an alternative solution of the automatic injection device, a second limiting protrusion 321 is arranged at one end of the release sleeve 3 close to the proximal end, and a second limiting groove is arranged on the inner wall of the housing 100. The second limiting protrusion 321 cooperates with the second limiting groove to limit the rotation of the release sleeve 3. Through the cooperation of the second limiting protrusion 321 and the second limiting groove, when the release sleeve 3 is pushed by the protective sleeve 102, it can only move along the axial direction of the push rod 2.

[0106] The second limiting protrusion 321 is arranged on the outer periphery of the second fixing ring 32, and the second limiting groove is arranged on the inner wall of the housing 101. There are two second limiting protrusions 321 arranged oppositely. Correspondingly, there are also two second limiting grooves arranged oppositely. The two second limiting protrusions 321 and the two second limiting grooves are in one-to-one correspondence and cooperation to ensure the balanced force of the release sleeve 3.

[0107] Continue to refer to Figures 4 - 7 , a stopper 17 is arranged at one end of the guide tube 1 away from the end face. A limiting groove 33 is arranged on the release sleeve 3. The limiting groove 33 is arranged between the release port 31 and the second fixing ring 32. The stopper 17 abuts against one end of the limiting groove 33 to limit the first extreme position of the release sleeve 3; the stopper 17 abuts against the other end of the limiting groove 33 to limit the second extreme position of the release sleeve 3. In the initial state, the side of the stopper 17 close to the distal end abuts against the side wall of the limiting groove 33 far from the proximal end, and the release sleeve 3 is located at the first extreme position. In the release state, the side of the stopper 17 close to the proximal end abuts against the side wall of the limiting groove 33 close to the proximal end, and the release sleeve 3 is located at the second extreme position. Through the cooperation of the limiting groove 33 and the stopper 17, it can prevent the release sleeve 3 from detaching from the guide tube 1 when moving axially under force.

[0108] There are two stop members 17 and two limit slots 33. The two stop members 17 are symmetrically arranged with respect to the center line of the guide tube 1, and the limit slots 33 are symmetrically arranged with respect to the center line of the release sleeve 3. The two stop members 17 and the two limit slots 33 are in one-to-one correspondence and cooperation to ensure that the release sleeve 3 is evenly stressed.

[0109] Continue to refer to Figure 6 and Figure 11 , a first limit groove 34 is provided on the inner wall of the release sleeve 3, and a first limit protrusion 18 is provided on the outer periphery of the guide tube 1. The first limit protrusion 18 cooperates with the first limit groove 34 to limit the relative rotation of the release sleeve 3 and the guide tube 1. In order to prevent the release sleeve 3 and the guide tube 1 from rotating relative to each other under force, the first limit protrusion 18 and the first limit groove 34 are cooperated to limit their relative rotation. Two first limit grooves 34 are symmetrically arranged with respect to the center line of the release sleeve 3, and the lengths of the two first limit grooves 34 are the same as the length of the release sleeve 3. Correspondingly, there are also two first limit protrusions 18, and the two first limit protrusions 18 and the two first limit grooves 34 are in one-to-one correspondence and cooperation to ensure that the guide tube 1 is evenly stressed.

[0110] As Figure 13 shown, the injection driving mechanism further includes a limit ring 9. The limit ring 9 is arranged at one end of the guide tube 1 away from the end face, and the limit ring 9 is used to limit the extreme position of the push rod 2. The limit ring 9 is arranged at one end of the guide tube 1 close to the proximal end, and is used to limit the extreme position of the push rod 2 when the push rod 2 moves from the distal end to the proximal end under force. When the push rod 2 moves to the extreme position, the liquid medicine in the syringe 201 is just squeezed out.

[0111] A third fixing hole 19 is provided on the guide tube 1, and a limit hook 91 is provided on the limit ring 9. The limit hook 91 cooperates with the third fixing hole 19 to fix the limit ring 9 to the guide tube 1. Through the cooperation of the limit hook 91 and the third fixing hole 19, the fixation of the guide tube 1 and the limit ring 9 is realized. Of course, the limit ring 9 can also be fixed to the guide tube 1 by other means such as plugging or screwing.

[0112] The limit ring 9 includes a limit arm. When the push rod 2 moves from the distal end to the proximal end, it drives the engaging ring 23 to move to abut against the side of the limit arm away from the proximal end to limit the extreme position of the push rod 2.

[0113] There are two limit arms arranged oppositely. The limit arm includes a first side wall and a second side wall. When the push rod 2 moves, one engaging block 24 moves between the first side wall of one limit arm and the second side wall of the other limit arm, and the other engaging block 24 moves between the second side wall of one limit arm and the first side wall of the other limit arm until the engaging ring 23 abuts against the side of the limit arm away from the proximal end.

[0114] Optionally, the limit catch 91 is arranged on the limit arm and penetrates through the limit arm. A second chute 92 is arranged on the inner side of the limit arm. The second chute 92 extends from the end of the limit arm far from the proximal end to the limit catch 91. A pressing block 26 is arranged between the two engaging blocks 24. When the push rod 2 moves, it drives the pressing block 26 to move along the second chute 92 until it abuts against the limit catch 91, so as to limit the high-speed movement of the push rod 2 and prevent the limit catch 91 from punching out of the third fixing hole 19.

[0115] In this embodiment, two limit catches 91 are oppositely arranged on the peripheral wall of the limit ring 9, and two third fixing holes 19 are arranged on the guide tube 1. Correspondingly, two second chutes 92 and pressing blocks 26 are also provided. To ensure the stability of the fixation of the limit ring 9 and the balance of the force on the push rod 2.

[0116] The working principle of the injection driving mechanism provided in this embodiment is as follows:

[0117] When using the automatic injection device, press the protective sleeve 102 against the skin surface of the person to be injected and press down forcefully. The outer shell 101 moves from the distal end to the proximal end, and the protective sleeve 102 moves from the proximal end to the distal end relative to the outer shell 101, and the injection needle gradually extends out of the protective sleeve 102 and pierces the skin; at the same time, the release sleeve 3 moves from the proximal end to the distal end under the driving force of the protective sleeve 102. When the release opening 31 on the release sleeve 3 reaches above the elastic arm 14 on the guide tube 1, the release sleeve 3 loses the circumferential restriction on the elastic arm 14, and the elastic arm 14 springs outwards, that is, the convex 141 on the elastic arm 14 pops out from between the block and the engaging block 24. At this time, the push rod 2 loses the circumferential rotation restriction, and the second energy storage element 6 resets and releases energy to drive the push rod 2 to move from the distal end to the proximal end. The push rod 2 acts on the piston 202, squeezing the liquid medicine in the syringe barrel 201 into the person to be injected through the injection needle, completing the automatic injection.

[0118] Embodiment 2:

[0119] This embodiment provides an automatic injection device. The automatic injection device includes an injection driving mechanism and a sound feedback mechanism. The injection driving mechanism can be the injection driving mechanism provided in Embodiment 1 or an injection driving mechanism with other structures.

[0120] As Figures 14 - 17 shown, this embodiment also provides a sound feedback mechanism for the above automatic injection device. The automatic injection device includes a guide tube 1 and a push rod 2. The sound feedback mechanism includes a sound ring 4, a first energy storage element 5 in an energy storage state, and a sound feedback component. The sound ring 4 and the first energy storage element 5 in an energy storage state are sleeved outside the push rod 2. One end of the first energy storage element 5 in an energy storage state is fixed to the sound ring 4, and the other end is fixed to the push rod 2. The first energy storage element 5 in an energy storage state provides kinetic energy for the sound ring 4 to rotate around the axis of the push rod 2.

[0121] An installation surface 11 is provided on the inner wall of the guide tube 1, and the sound - generating ring 4 abuts against the installation surface 11. When the push rod 2 moves to drive the sound - generating ring 4 to move, the sound - generating ring 4 gradually disengages from the abutment with the installation surface 11, and the sound - generating ring 4 rotates under the torsional force of the first energy - storage element 5 in the energy - storage state. The sound - generating feedback assembly includes a guiding surface 12 and a terminating surface 13 provided on the tube wall of the guide tube 1. The installation surface 11, the guiding surface 12, and the terminating surface 13 are arranged in sequence along the direction from the distal end to the proximal end. Moreover, there are certain height differences in the circumferential direction of the guide tube 1 at one end of the installation surface 11 and the guiding surface 12 close to the installation surface 11, one end of the guiding surface 12 close to the terminating surface 13, and the terminating surface 13. The guiding surface 12 includes a first abutting surface 121, a second abutting surface 123, and an inclined surface 122 for connecting the first abutting surface 121 and the second abutting surface 123. During the movement of the sound - generating ring 4, when it moves from the installation surface 11 to the first abutting surface 121, a starting prompt sound is generated. When moving on the inclined surface 122 to drive the sound - generating ring 4 to rotate, it can enable the first energy - storage element 5 in the energy - storage state to continue storing energy. When the sound - generating ring 4 moves from the second abutting surface 123 to the terminating surface 13, a terminating prompt sound is generated.

[0122] By applying a force from the proximal end to the distal end to the release sleeve 3 on the injection driving mechanism, the guiding tube 1 releases the restriction on the axial movement of the push rod 2. The push rod 2 moves from the distal end to the proximal end to drive the piston 202 of the automatic injection device to move, thereby completing the pushing of the liquid medicine. In the initial state, the sound - generating ring 4 abuts against the mounting surface 11 on the inner wall of the guiding tube 1. During the process of the push rod 2 driving the sound - generating ring 4 and the first energy - storage element 5 in the energy - storage state to move from the distal end to the proximal end, after the sound - generating ring 4 gradually disengages from the abutment with the mounting surface 11, the sound - generating ring 4 rotates under the torsional force of the first energy - storage element 5 in the energy - storage state and lands on the first abutting surface 121 of the guiding surface 12 with a height difference from the mounting surface 11. The sound - generating ring 4 collides with the first abutting surface 121 to emit a "click" sound, which is the starting prompt sound, indicating to the person receiving the injection that the injection has started. As the sound - generating ring 4 moves to the inclined surface 122, the inclined surface 122 causes the sound - generating ring 4 to rotate, driving the first energy - storage element 5 to continue storing energy. When the sound - generating ring 4 reaches the second abutting surface 123, the energy storage of the first energy - storage element 5 ends, and the second abutting surface 123 can prevent the sound - generating ring 4 from rotating. The push rod 2 continues to drive the sound - generating ring 4 to move. When the sound - generating ring 4 disengages from the abutment with the second abutting surface 123, the rotation of the sound - generating ring 4 is no longer restricted. The first energy - storage element 5 in the energy - storage state releases the stored torsional force, driving the sound - generating ring 4 to rotate. At the same time, the sound - generating ring 4 lands on the termination surface 13 with a height difference from the second abutting surface 123. The sound - generating ring 4 collides with the termination surface 13 to emit a "click" sound, which is the termination prompt sound, indicating to the person receiving the injection that the injection is about to end. The automatic injection driving device provided in this embodiment, by providing the mounting surface 11, the guiding surface 12, and the termination surface 13 on the tube wall of the guiding tube 1, the first energy - storage element 5 in the energy - storage state provides kinetic energy for the sound - generating ring 4 to rotate around the axis of the push rod 2, so that when the sound - generating ring 4 moves from the distal end to the proximal end along with the push rod 2, the first energy - storage element 5 in the energy - storage state drives the sound - generating ring 4 to rotate, generating a starting prompt sound when colliding with the first abutting surface 121 at the start of the injection; generating a termination prompt sound when colliding with the termination surface 13 when the injection is about to end; effectively preventing the person receiving the injection from misjudging the injection process during the injection and causing harm. Moreover, this automatic injection driving device does not need to use electronic components, reducing the influence of the external environment on the feedback sound of the sound - generating feedback mechanism, improving the reliability and stability of the sound - generating feedback mechanism while reducing the cost.

[0123] The sound - generating ring 4 rotates between two first sliding grooves 15 in the guiding tube 1. The guiding surface 12 and the termination surface 13 are arranged between the two first sliding grooves 15. The first limiting strip 151 runs through the guiding tube 1 along the axial direction, and the second limiting strip 152 extends from the proximal - end - close position of the guiding tube 1 to a position close to the mounting surface 11 and then stops.

[0124] In this embodiment, the bump 41 of the sound - generating ring 4 includes a sound - generating feedback surface 411, and the length of the first limiting strip 151 is longer than that of the second limiting strip 152. When assembling the automatic injection device, the push rod 2, the sound - generating ring 4, and the first energy - storage element 5 in the energy - storage state feed along the first chute 15. The first chute 15 restricts the feeding paths of the push rod 2 and the sound - generating ring 4. Since the first energy - storage element 5 in the energy - storage state has a tendency to release the torsional force and return to its original position, the bump 41 of the sound - generating ring 4 is driven by the torsional force, so that the sound - generating feedback surface 411 abuts against the second limiting strip 152 and feeds along the inner side of the second limiting strip 152. At the same time, the engaging block 24 and the locking block of the push rod 2 are driven by the torsional force of the first energy - storage element 5 in the energy - storage state, so that the engaging block 24 and the locking block abut against the first limiting strip 151 and feed along the inner side of the first limiting strip 151. When the sound - generating ring 4 feeds to the farthest end position of the second limiting strip 152, the bump 41 of the sound - generating ring 4 loses the circumferential restriction, and the first energy - storage element 5 in the energy - storage state partially releases the stored torsional force. The bump 41 of the sound - generating ring 4 disengages from the second limiting strip 152, so that the sound - generating feedback surface 411 can abut against the mounting surface 11. At this time, the assembly of the automatic injection device is completed. The first limiting strip and the second limiting strip are also provided in two.

[0125] Of course, the lengths of the first limiting strip 151 and the second limiting strip 152 are not limited to the above - mentioned situation. The length of the first limiting strip 151 can also be less than that of the second limiting strip 152. When the length of the first limiting strip 151 is less than that of the second limiting strip 152, the rotation direction of the sound - generating ring 4 will change accordingly, and no specific limitation is made here.

[0126] The sound - generating feedback mechanism provided in this embodiment can adjust the sound volume of the starting prompt sound by adjusting the height difference between the mounting surface 11 and the first abutting surface 121. Preferably, the mounting surface 11 is arranged close to the second limiting strip 152 of one of the first chutes 15, and the maximum limit position of the first abutting surface 121 is the first limiting strip 151 of the other first chute 15.

[0127] The sound - generating feedback mechanism provided in this embodiment can adjust the sound volume of the termination prompt sound by adjusting the height difference between the second abutting surface 123 and the termination surface 13. Preferably, the second abutting surface 123 is arranged close to the second limiting strip 152 of one of the first chutes 15, and the maximum limit position of the termination surface 13 is the first limiting strip 151 of the other first chute 15.

[0128] Such as Figure 15 and Figure 17As shown, bumps 41 are provided on the outer surface of the sound - generating ring 4. The bump 41 includes a sound - generating feedback surface 411. The sound - generating feedback surface 411 is the side surface where the bump 41 is connected to the outer wall of the sound - generating ring 4. The sound - generating feedback surface 411 can abut against the mounting surface 11 and can cooperate with the guiding surface 12 and the terminating surface 13 in sequence. When the injection driving mechanism is in the initial state, the sound - generating feedback surface 411 abuts against the mounting surface 11. As the push rod 2 drives the sound - generating ring 4 and the first energy - storing element 5 in the energy - storing state to move from the distal end to the proximal end, the sound - generating feedback surface 411 disengages from the abutment with the mounting surface 11. Under the torsional force of the first energy - storing element 5 in the energy - storing state, the sound - generating ring 4 rotates until it reaches the first abutting surface 121 of the guiding surface 12 with a height difference from the mounting surface 11, and the sound - generating feedback surface 411 impacts the first abutting surface 121 to generate a starting prompt sound. At this time, part of the energy of the first energy - storing element 5 in the energy - storing state is released, and the sound - generating ring 4 moves along the inclined surface 122 driven by the push rod 2. The inclined surface 122 causes the sound - generating ring 4 to rotate, enabling the first energy - storing element 5 to be torsionally energy - stored again until it moves to the second abutting surface 123 and the energy - storing ends, and the sound - generating ring 4 stops rotating. The sound - generating ring 4 continues to move with the push rod 2. When it completely disengages from the second abutting surface 123, the rotation of the sound - generating ring 4 is no longer restricted. The energy of the first energy - storing element 5 in the energy - storing state is released again, driving the sound - generating ring 4 to rotate to the terminating surface 13 with a height difference from the second abutting surface 123, and the sound - generating feedback surface 411 impacts the terminating surface 13 to generate a terminating prompt sound.

[0129] To facilitate the machining of the guiding surface 12 and the terminating surface 13, when machining the guiding surface 12 and the terminating surface 13, grooves are first formed on the guiding tube 1 to facilitate the formation of the guiding surface 12 connecting the first abutting surface 121 and the second abutting surface 123 through the inclined surface 122, and the terminating surface 13 with a height difference from the guiding surface 12.

[0130] In this embodiment, two bumps 41 are provided, and the two bumps 41 are arranged oppositely; correspondingly, both the mounting surface 11 and the sound - generating feedback assembly are also provided with two.

[0131] As Figure 14 and Figure 15As shown in the figure, the first energy storage element 5 in the energy storage state is a torsion spring. A first fixing hole 412 is formed on the bump 41, and a second fixing hole 221 is formed on the outer periphery of the push rod 2. The axes of the first fixing hole 412 and the second fixing hole 221 are both parallel to the axis of the guide tube 1. One end of the torsion spring is inserted into the first fixing hole 412, and the other end is inserted into the second fixing hole 221. The torsion spring is fixed to the sounding ring 4 and the push rod 2 through the first fixing hole 412 and the second fixing hole 221, so that the rotation of the sounding ring 4 can store energy in the first energy storage element 5; when the first energy storage element 5 in the energy storage state releases energy, it can drive the sounding ring 4 to rotate, so that the sounding ring 4 collides with the first abutting surface 121 to generate an obvious start prompt sound, and collides with the end surface 13 to generate an obvious end prompt sound, making it clearer for the recipient of the injection to hear, and the recipient of the injection with long-term treatment and weak perception ability can also control the injection process.

[0132] For the sound feedback mechanism provided in this embodiment, during the production process, the sound volumes of the start prompt sound and the end prompt sound can be adjusted by selecting the first energy storage element 5 with different elastic coefficients, adjusting the length of the inclined surface 122, adjusting the relative height of the guide surface 12 and the mounting surface 11 in the circumferential direction of the guide tube 1, or adjusting the height difference between the second abutting surface 123 and the end surface 13 in the circumferential direction of the guide tube 1. The greater the elastic coefficient of the first energy storage element 5, the greater the driving force, and the greater the start prompt sound and the end prompt sound; the greater the height difference between the guide surface 12 and the mounting surface 11 in the circumferential direction of the guide tube 1, the greater the start sound; the longer the length of the inclined surface 122, and the greater the height difference between the second abutting surface 123 and the end surface 13 in the circumferential direction of the guide tube 1, the greater the end prompt sound.

[0133] A first limiting portion 21 and a second limiting portion 22 are arranged at intervals on the outer surface of the push rod 2. The sounding ring 4 and the first energy storage element 5 in the energy storage state are arranged between the first limiting portion 21 and the second limiting portion 22. One end of the sounding ring 4 away from the first energy storage element 5 in the energy storage state cooperates with the first limiting portion 21, and one end of the first energy storage element 5 in the energy storage state away from the sounding ring 4 cooperates with the second limiting portion 22. The second fixing hole 221 is arranged on the second limiting portion 22. The position of the sounding ring 4 on the push rod 2 is restricted by the first limiting portion 21 and the second limiting portion 22 to prevent the sounding ring 4 from detaching from the push rod 2 during the energy storage and energy release processes of the first energy storage element 5 in the energy storage state.

[0134] A fixing portion is arranged on the second limiting portion 22, and the second fixing hole 221 is arranged on the fixing portion so that the height of the second fixing hole 221 is adapted to the height of the insertion portion on the torsion spring. An insertion portion is arranged at each end of the torsion spring.

[0135] The first limiting portion 21 includes two relatively arranged limiting platforms, and the second limiting portion 22 is arranged as an annular ring.

[0136] The engaging ring 23 is disposed close to the second limiting portion 22. To accommodate the length of the insertion portion of the torsion spring, fixing portions are also provided on the engaging ring 23. The second fixing holes 221 on the two fixing portions are oppositely disposed, so that the insertion portion of the torsion spring away from the sounding ring 4 is inserted into the second fixing holes 221 on the two fixing portions.

[0137] The working principle of the sound feedback mechanism of the automatic injection device provided in this embodiment is as follows:

[0138] As Figure 18 and Figure 19 shown, by providing a mounting surface 11 on the inner wall of the guide tube 1, when the injection driving mechanism is in the initial state, the sound feedback surface 411 of the sounding ring 4 abuts against the mounting surface 11. At this time, the first energy storage element 5 is in the energy storage state. Since the second energy storage element 6 has a tendency to reset and release energy, a thrust F1 (not shown in the figure) from the distal end to the proximal end will be generated on the push rod 2 and the sounding ring 4. The first energy storage element 5 in the energy storage state needs to rotate and reset to release energy. From the proximal perspective, a radial clockwise tangential force F2 will be generated on the push rod 2, and a radial counterclockwise tangential force F3 will be generated on the sounding ring 4. Under the action of F1, F2 and F3, the latch and the engaging block 24 of the push rod 2 tend to fit the first sliding groove 15, and the convex block 41 of the sounding ring 4 tends to slide into the guiding surface 12, and the push rod 2 drives the sounding ring 4 to move proximally.

[0139] As Figure 20 and Figure 21As shown, at the moment when the injection driving mechanism is triggered by the protective sleeve 102, since the first energy storage element 5 in the energy storage state needs to rotate and reset to release energy, the bump 41 slides into the guiding surface 12, and the sound generating feedback surface 411 of the bump 41 impacts the first abutting surface 121, emitting a first "click" impact sound to prompt the person receiving the injection that the injection has started. As the sound generating ring 4 continues to move from the distal end to the proximal end, the bump 41 continues to slide along the inclined surface 122 and the second abutting surface 123 of the guiding surface 12. The inclined surface 122 causes the sound generating ring 4 to rotate around the axis of the push rod 2, and the first energy storage element 5 stores energy. When the sound generating ring 4 slides to the second abutting surface 123, the energy storage of the first energy storage element 5 ends, and the second abutting surface 123 limits the position of the bump 41 to prevent the sound generating ring 4 from continuing to rotate under the action of the first energy storage element 5 in the energy storage state. The push rod 2, the first energy storage element 5 in the energy storage state, and the sound generating ring 4 maintain a relatively static state under the action of the second energy storage element 6 and move linearly together from the distal end to the proximal end. As the sound generating ring 4 continues to move, when the sound generating ring 4 is completely disengaged from the second abutting surface 123, the second abutting surface 123 no longer limits the position of the bump 41, and the first energy storage element 5 in the energy storage state releases the stored torsional force, driving the sound generating ring 4 to start rotating circumferentially around the axis of the push rod 2 (under the action of the counterclockwise tangential force F3). When the sound generating ring 4 moves from the second abutting surface 123 to the termination surface 13, due to the relatively large energy of the first energy storage element 5 in the energy storage state, the sound generating feedback surface 411 impacts the termination surface 13, emitting a second "click" impact sound to prompt the person receiving the injection that the injection is about to end.

[0140] In this embodiment, when the sound generating feedback surface 411 impacts the termination surface 13, the energy of the first energy storage element 5 in the energy storage state is not completely released.

[0141] The working principle of the automatic injection device provided in this embodiment is as follows:

[0142] The release sleeve 3 moves from the proximal end to the distal end under the driving force of the protective sleeve 102. When the release port 31 on the release sleeve 3 reaches above the elastic arm 14 on the guiding tube 1, the release sleeve 3 loses the circumferential restriction on the elastic arm 14, and the elastic arm 14 springs outwards, that is, the clamping protrusion 141 on the elastic arm 14 pops out from between the engaging ring 23 and the engaging block 24. At this time, the push rod 2 loses the circumferential rotation restriction, and the second energy storage element 6 resets and releases energy to drive the push rod 2 to move from the distal end to the proximal end.

[0143] When the push rod 2 moves from the distal end to the proximal end, the thrust force F acting on the push rod 2 causes the first energy storage element 5 in the energy storage state to tend to reset, and drives the sound - generating ring 4 to slide from the mounting surface 11 into the guiding surface 12, emitting the first "click" start - prompt sound to prompt the recipient of the injection to start the injection. The second energy storage element 6 continuously releases energy, driving the push rod 2 and the sound - generating ring 4 to continuously move towards the proximal end. The sound - generating feedback surface 411 of the bump 41 slides along the first abutting surface 121, the inclined surface 122, and the second abutting surface 123. When the sound - generating ring 4 slides on the inclined surface 122, the first energy storage element 5 continuously stores energy. When the sound - generating ring 4 moves to the second abutting surface 123, the sound - generating ring 4 stops rotating, and the first energy storage element 5 stops storing energy. When the sound - generating ring 4 moves from the second abutting surface 123 to the termination surface 13, the second "click" termination - prompt sound is emitted to prompt the recipient of the injection that the injection is completed.

[0144] During the process of the push rod 2 moving from the distal end to the proximal end, the latch and the engaging block 24 always move from the distal end to the proximal end along the first chute 15. When the pressing block 26 on the push rod 2 moves to the second chute 92 of the limit ring 9 and the limit arm abuts against the engaging ring 23, the push rod 2 cannot move. At the same time, the pressing block 26 restricts the excessive impact force of the push rod from causing the limit hook 91 to rush out of the third fixing hole 19. The recipient of the injection hears the termination - prompt sound, and the liquid medicine pushing is completed. After the liquid medicine pushing is completed, the recipient of the injection removes the automatic injection device from the skin surface, and the driving force acting on the release sleeve 3 disappears. The release sleeve 3 resets under the action of the elastic restoring force of the third energy storage element 8. The elastic arm 14 is compressed by the force inside the release sleeve 3, and the clamping projection 141 is engaged between the latch and the engaging block 24. Under the action of the release sleeve 3, the protective sleeve 102 moves along the housing 101 towards the proximal - end direction to retract the injection needle.

[0145] The automatic injection device applying the above - mentioned sound - generating feedback mechanism can emit start - prompt sounds and termination - prompt sounds during the injection process to prompt the recipient of the injection about the injection process, can effectively avoid the influence of the external environment on the sound - generating feedback mechanism, and prevent the recipient of the injection from misjudging the injection process and causing harm during the injection; moreover, it reduces the cost of the automatic injection device.

[0146] Embodiment Three:

[0147] For the recipient of the injection with high - dose liquid medicine infusion, if the infusion time is too long, the recipient of the injection may be confused about whether they missed the termination - prompt sound because they have waited for a long time to listen to the prompt sound of the injection completion, and the experience is relatively poor. To solve this problem, the sound - generating feedback mechanism of the automatic injection device provided in this embodiment emits continuous sounds, that is, during the process from the start of the injection to the completion of the injection, it emits sounds at a set interval. When no sound is heard, it means that the injection has been completed.

[0148] The automatic injection device provided in this embodiment is basically the same in structure as the automatic injection device provided in Embodiment 2, except for the setting of the guiding surface 12.

[0149] In this embodiment, a plurality of guiding surfaces 12 are sequentially arranged on the tube wall of the guiding tube 1 between the mounting surface 11 and the termination surface 13. During the working process, the sounding ring 4 sequentially impacts and makes sounds with each guiding surface 12 to generate continuous signal feedback. After the mounting surface 11 on the tube wall of the guiding tube 1, a first guiding surface, a second guiding surface, a third guiding surface,... and a termination surface are sequentially arranged, and the number of guiding surfaces 12 is set according to the dose of the liquid medicine.

[0150] As the push rod 2 is released and moves from the distal end to the proximal end, the convex block 41 of the sounding ring 4 impacts and makes a sound with the first abutting surface 121 of the first guiding surface, and then the first energy storage element 5 stores energy on the inclined surface 122 of the first guiding surface and continues to move to the second abutting surface 123 of the first guiding surface. When the sounding ring 4 moves to the first abutting surface 121 of the second guiding surface, the convex block 41 impacts and makes a sound with the first abutting surface 121 of the second guiding surface, and the first energy storage element 5 stores energy again through the inclined surface 122 of the second guiding surface,... until the convex block 41 impacts the termination surface 13 to emit a termination prompt sound, that is, during the injection process of the automatic injection device, it will make a sound at regular intervals to prompt the person receiving the injection that they are being injected. When the prompt sound cannot be heard, it indicates that the injection is completed.

[0151] The setting of continuous sounding has a more significant prompting effect on the elderly with insensitive reactions and the persons receiving injections with hearing impairments. The continuous sounding can continuously remind the person receiving the injection of the injection process. Even if the second "click" impact sound is missed, the continuous sound can still be heard during the subsequent injection process until the last "click" impact sound ends and no more impact sounds are heard, indicating that the injection is completed, preventing the person receiving the injection from misjudging the injection process and causing harm during the injection process.

[0152] The above content is only a preferred embodiment of the present invention. For those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. The content of this specification should not be construed as a limitation to the present invention.

Claims

1. Injection driving mechanism for an automatic injection device, comprising a guide tube (1), a push rod (2), a release sleeve (3) and a third energy storage element (8). The guide tube (1) is nested within the release sleeve (3), and the third energy storage element (8) is provided on the outer periphery of the release sleeve (3); characterized in that, The elastic arm (14) of the guide tube (1) cooperates with the engaging portion of the push rod (2) to form a limiting component. A stop member (17) is provided on the guide tube (1) near the proximal end. The side of the stop member (17) near the distal end is set as a vertical surface. The release sleeve (3) is provided with a limiting groove (33). The third energy storage element (8) causes the side of the limiting groove (33) away from the proximal end to abut against the vertical surface, and the vertical surface of the stop member (17) blocks the release sleeve (3) from moving towards the proximal end; at the same time, the elastic arm (14) of the guide tube (1) is pressed by the wall of the release sleeve (3), and the elastic arm (14) abuts against the engaging portion of the push rod (2) to position the push rod (2), so that the injection driving mechanism cannot be self-released, achieving self-locking; the proximal end is the end close to the person receiving the injection.

2. The injection driving mechanism according to claim 1, wherein The guide tube (1) is provided with a first fixing ring (16), and the release sleeve (3) is provided with a second fixing ring (32). One end of the third energy storage element (8) abuts against the first fixing ring (16), and the other end abuts against the second fixing ring (32).

3. The injection driving mechanism according to claim 2, wherein The release sleeve (3) is provided with a release opening (31), and the limiting groove (33) is provided between the release opening (31) and the second fixing ring (32). The stop member (17) abuts against one end of the limiting groove (33) to limit the first extreme position of the release sleeve (3); the stop member (17) abuts against the other end of the limiting groove (33) to limit the second extreme position of the release sleeve (3).

4. The injection driving mechanism according to claim 2, characterized in that, The engaging portion includes an engaging ring (23) and an engaging block (24). The engaging ring (23) is provided on the outer periphery of the push rod (2). The engaging ring (23) and the engaging block (24) are arranged at intervals along the axial direction of the push rod (2), and the elastic arm (14) is clamped between the engaging ring (23) and the engaging block (24).

5. The injection driving mechanism according to claim 4, wherein, The inner wall of the guide tube (1) is provided with a first sliding groove (15), and the engaging block (24) moves along the first sliding groove (15) to limit the rotation of the push rod (2).

6. The injection driving mechanism according to claim 4, wherein, The push rod (2) includes a central hole (25) with one end open, and a second energy storage element (6) is arranged in the central hole (25); one end of the guide tube (1) has an end face. One end of the second energy storage element (6) abuts against the end face of the guide tube (1), and the other end abuts against the bottom of the central hole (25).

7. The injection driving mechanism according to claim 6, wherein The injection driving mechanism further includes a bottom cover (7). A guide rod (71) is provided at the center of the bottom cover (7). The bottom cover (7) is fixedly connected to the guide tube (1). The guide rod (71) can enter the central hole (25), and the second energy storage element (6) is sleeved on the guide rod (71).

8. The injection driving mechanism according to claim 7, wherein A hook (72) is provided on the bottom cover (7). The hook (72) is clamped with the first fixing ring (16) to fix the bottom cover (7) and the guide tube (1).

9. The injection driving mechanism according to claim 6, characterized in that, The injection driving mechanism further includes a limit ring (9). The limit ring (9) is arranged at one end of the guide tube (1) away from the end face. The limit ring (9) is used to limit the extreme position of the push rod (2).

10. The injection driving mechanism according to claim 9, characterized in that, A third fixing hole (19) is provided on the guide tube (1). A limit hook (91) is provided on the limit ring (9). The limit hook (91) cooperates with the third fixing hole (19) to fix the limit ring (9) on the guide tube (1).

11. The injection driving mechanism according to claim 10, wherein, The limit ring (9) includes a limit arm. The push rod (2) moves from the distal end to the proximal end, driving the engaging ring (23) to move to abut against the side of the limit arm away from the proximal end, so as to limit the extreme position of the push rod (2).

12. The injection driving mechanism according to claim 11, wherein, The limit hook (91) is arranged on the limit arm and penetrates through the limit arm. A second sliding groove (92) is arranged on the inner side of the limit arm. The second sliding groove (92) extends from the end of the limit arm away from the proximal end to the limit hook (91). There are two engaging blocks (24). A pressing block (26) is arranged between the two engaging blocks (24). The push rod (2) moves, driving the pressing block (26) to move to abut against the limit hook (91), so as to limit the high-speed movement of the push rod (2) to prevent the limit hook (91) from breaking out of the third fixing hole (19).

13. The injection driving mechanism according to claim 1, characterized in that, A first limit groove (34) is provided on the inner wall of the release sleeve (3). A first limit protrusion (18) is arranged on the outer periphery of the guide tube (1). The first limit protrusion (18) cooperates with the first limit groove (34) to limit the relative rotation of the release sleeve (3) and the guide tube (1).

14. Injection driving mechanism for an automatic injection device, the automatic injection device comprising a protective sleeve (102) and a housing (101), the injection driving mechanism comprising a guide tube (1), a push rod (2) and a release sleeve (3), characterized in that, The elastic arm (14) of the guide tube (1) and the engaging part of the push rod (2) cooperate to form a limit assembly. The release sleeve (3) is provided with a release port (31). One end of the protective sleeve (102) extending into the housing (101) contacts the release sleeve (3). When the injection driving mechanism is not released, the elastic arm (14) abuts against the engaging part to position the push rod (2). The axial movement of the protective sleeve (102) drives the axial movement of the release sleeve (3). When the release port (31) reaches the position of the elastic arm (14), the elastic arm (14) springs outwards and separates from the engaging part. The guide tube (1) releases the limit on the push rod (2). The push rod (2) moves from the distal end to the proximal end, and the injection driving mechanism is released. The proximal end is the end close to the person receiving the injection.

15. The injection driving mechanism according to claim 14, characterized in that, A third energy storage element (8) is provided on the outer periphery of the release sleeve (3). The guide tube (1) is provided with a first fixing ring (16), and the release sleeve (3) is provided with a second fixing ring (32). One end of the third energy storage element (8) abuts against the first fixing ring (16), and the other end abuts against the second fixing ring (32).

16. The injection driving mechanism according to claim 15, characterized in that, The engaging portion includes an engaging ring (23) and an engaging block (24). The engaging ring (23) is provided on the outer periphery of the push rod (2). The engaging ring (23) and the engaging block (24) are arranged at intervals along the axial direction of the push rod (2). The elastic arm (14) is clamped between the engaging ring (23) and the engaging block (24).

17. The injection driving mechanism according to claim 16, wherein A first sliding groove (15) is provided on the inner wall of the guide tube (1). The engaging block (24) moves along the first sliding groove (15) to limit the rotation of the push rod (2).

18. The injection driving mechanism according to claim 16, wherein, The push rod (2) includes a central hole (25) with one end open, and a second energy storage element (6) is arranged in the central hole (25); one end of the guide tube (1) has an end face, one end of the second energy storage element (6) abuts against the end face of the guide tube (1), and the other end abuts against the bottom of the central hole (25).

19. The injection driving mechanism according to claim 18, wherein The injection driving mechanism further includes a bottom cover (7). A guide rod (71) is provided at the center of the bottom cover (7). The bottom cover (7) is fixedly connected to the guide tube (1). The guide rod (71) can enter the central hole (25), and the second energy storage element (6) is sleeved on the guide rod (71).

20. The injection driving mechanism according to claim 19, wherein A hook (72) is provided on the bottom cover (7). The hook (72) is engaged with the first fixing ring (16) to fix the bottom cover (7) to the guide tube (1).

21. The injection driving mechanism according to claim 15, characterized in that, A stopper (17) is provided on one side of the guide tube (1) close to the proximal end. A limiting groove (33) is provided on the release sleeve (3). The limiting groove (33) is arranged between the release port (31) and the second fixing ring (32). The stopper (17) abuts against one end of the limiting groove (33) to limit the first extreme position of the release sleeve (3); the stopper (17) abuts against the other end of the limiting groove (33) to limit the second extreme position of the release sleeve (3).

22. The injection driving mechanism according to claim 18, wherein, The injection driving mechanism further includes a limiting ring (9). The limiting ring (9) is arranged at one end of the guide tube (1) away from the end face. The limiting ring (9) is used to limit the extreme position of the push rod (2).

23. The injection driving mechanism according to claim 22, wherein, A third fixing hole (19) is provided on the guide tube (1). A limiting hook (91) is provided on the limiting ring (9). The limiting hook (91) cooperates with the third fixing hole (19) to fix the limiting ring (9) to the guide tube (1).

24. The injection driving mechanism according to claim 23, wherein, The limiting ring (9) includes a limiting arm. The push rod (2) moves from the distal end to the proximal end, driving the engaging ring (23) to move to abut against the side of the limiting arm away from the proximal end to limit the extreme position of the push rod (2).

25. The injection driving mechanism according to claim 24, wherein, The limiting hook (91) is arranged on the limiting arm and penetrates through the limiting arm. A second sliding groove (92) is arranged on the inner side of the limiting arm. The second sliding groove (92) extends from the end of the limiting arm far away from the proximal end to the limiting hook (91). There are two engaging blocks (24). A pressing block (26) is arranged between the two engaging blocks (24). The push rod (2) moves to drive the pressing block (26) to move to abut against the limiting hook (91), so as to limit the high-speed movement of the push rod (2) and prevent the limiting hook (91) from punching out of the third fixing hole (19).

26. The injection driving mechanism according to claim 14, characterized in that, A first limiting groove (34) is arranged on the inner wall of the release sleeve (3). A first limiting protrusion (18) is arranged on the outer periphery of the guide tube (1). The first limiting protrusion (18) cooperates with the first limiting groove (34) to limit the relative rotation of the release sleeve (3) and the guide tube (1).

27. An auto-injection device, characterized in that, It includes a housing (100), an injection mechanism (200) and the injection driving mechanism according to any one of claims 1-26. The injection mechanism (200) and the injection driving mechanism are both arranged in the housing (100). The injection mechanism (200) is installed at one end of the injection driving mechanism close to the proximal end.

28. The auto-injector device according to claim 27, characterized in that, A second limiting protrusion (321) is arranged at the end of the release sleeve (3) close to the proximal end. A second limiting groove is arranged on the inner wall of the housing (100). The second limiting protrusion (321) cooperates with the second limiting groove to limit the rotation of the release sleeve (3).

29. An automatic injection device, the automatic injection device includes a protective sleeve (102), a housing (101), a sound feedback mechanism and the injection driving mechanism according to any one of claims 1-26, characterized in that The sound feedback mechanism includes a sounding ring (4), a first energy storage element (5) in an energy storage state and a sound feedback assembly. The first energy storage element (5) in the energy storage state provides kinetic energy for the sounding ring (4). The sound feedback assembly includes a guiding surface (12) and a terminating surface (13). The guiding surface (12) includes a first abutting surface (121), a second abutting surface (123) and an inclined surface (122) located between the first abutting surface (121) and the second abutting surface (123). When the sounding ring (4) moves during the movement process, a starting prompt sound is generated when it moves from the mounting surface (11) of the guide tube (1) to the first abutting surface (121). When the sounding ring (4) moves on the inclined surface (122), driving the sounding ring (4) to rotate can enable the first energy storage element (5) in the energy storage state to continue to store energy. When the sounding ring (4) reaches the second abutting surface (123), the energy storage of the first energy storage element (5) ends, and the second abutting surface (123) can prevent the sounding ring (4) from rotating. When the sounding ring (4) moves from the second abutting surface (123) to the terminating surface (13), a terminating prompt sound is generated.

30. The auto-injection device according to claim 29, characterized in that, A plurality of the guiding surfaces (12) are sequentially arranged on the tube wall of the guiding tube (1) between the mounting surface (11) and the termination surface (13). During the working process, the sounding ring (4) impacts and generates sound with each of the guiding surfaces (12) in sequence to generate continuous signal feedback.

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