Sound feedback mechanism, injection drive mechanism and automatic injection device

Abstract

The present invention discloses a sound feedback mechanism, an injection driving mechanism and an automatic injection device, relating to the technical field of automatic syringes. The sound feedback mechanism is used for an automatic injection device, the automatic injection device includes a guiding tube, the sound feedback mechanism includes a sounding ring, a first energy storage element in an energy storage state and a sound feedback component, and the first energy storage element in the energy storage state provides kinetic energy for the sounding ring. The sound feedback component includes a guiding surface and a terminating surface, and 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 sounding ring, a starting prompt sound is generated when the sounding ring moves from the mounting surface of the guiding tube to the first abutting surface. When the sounding ring moves on the inclined surface and drives the sounding ring to rotate, the first energy storage element can continue to store energy. When the sounding ring moves from the second abutting surface to the terminating surface, a terminating prompt sound is generated. The sound feedback mechanism improves the reliability and stability of sound feedback, and reduces the cost at the same time.

Description

Technical Field

[0001] The present invention relates to the technical field of auto-injectors, and particularly to a sound feedback mechanism, an injection driving mechanism and an auto-injection device. Background Art

[0002] An auto-injector is used to infuse a medicinal solution into the body of a person receiving an injection. The auto-injector includes an injection mechanism for holding the medicinal solution. 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, there is arranged an injection driving mechanism, which is used to drive the piston to complete the pushing action of the auto-injector on the medicinal solution. The injection operation of the auto-injector is usually completed independently by the person receiving the injection. Therefore, how to 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.

[0003] Existing auto-injectors usually have multi-dimensional feedback during the injection process, such as: auditory, visual and tactile. The person receiving the injection can control the entire injection process by obtaining feedback signals. However, most of the multi-dimensional feedback in the existing technology is completed by relying on electronic components. Therefore, the auto-injector needs to be self-powered by a 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 auto-injector; moreover, the cost is relatively high. Summary of the Invention

[0004] One of the purposes of the present invention is to provide a sound feedback mechanism and an auto-injection device. The auto-injection device applying the sound feedback mechanism can not only enable the person receiving the injection to control the injection process, but also ensure the stability and reliability of the auto-injection device, and the cost is relatively low.

[0005] To achieve this purpose, the present invention adopts the following technical solutions:

[0006] A sound feedback mechanism for an auto-injection device. The auto-injection device includes a guide tube. The sound feedback mechanism includes a sound ring, a first energy storage element in an energy storage state, and a sound feedback component. The first energy storage element in the energy storage state provides kinetic energy for the sound ring; the sound feedback component includes a guiding surface and a terminating surface. Among them, 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. When the sound ring moves, a starting prompt sound is generated when it moves from the mounting surface of the guide tube to the first abutting surface. When the sound ring moves on the inclined surface and drives the sound ring to rotate, the first energy storage element in the energy storage state can continue to store energy. When the sound ring moves from the second abutting surface to the terminating surface, a terminating prompt sound is generated.

[0007] As an alternative embodiment of the sound - generating feedback mechanism, bumps are provided on the outer surface of the sound - generating ring. The bumps include sound - generating feedback surfaces, and the sound - generating feedback surface is the side surface where the bump is connected to the sound - generating ring. The sound - generating feedback surface can be in contact with the mounting surface and can cooperate with the guiding surface and the terminating surface in sequence.

[0008] As an alternative embodiment of the sound - generating feedback mechanism, the automatic injection device includes a push rod. The push rod is disposed inside the guiding tube. The sound - generating ring and the first energy - storing element in the energy - storing state are sleeved outside the push rod. One end of the first energy - storing element in the energy - storing state is fixed to the sound - generating ring, and the other end is fixed to the push rod.

[0009] As an alternative embodiment of the sound - generating feedback mechanism, the first energy - storing element in the energy - storing state is a torsion spring. A first fixing hole is formed on the bump, and a second fixing hole is formed on the outer circumference of the push rod. The axes of the first fixing hole and the second fixing hole are both parallel to the axis of the guiding tube. One end of the torsion spring is inserted into the first fixing hole, and the other end is inserted into the second fixing hole.

[0010] As an alternative embodiment of the sound - generating feedback mechanism, a first limiting portion and a second limiting portion are spaced apart on the outer surface of the push rod. The sound - generating ring and the first energy - storing element in the energy - storing state are disposed between the first limiting portion and the second limiting portion. One end of the sound - generating ring away from the first energy - storing element in the energy - storing state cooperates with the first limiting portion, and one end of the first energy - storing element in the energy - storing state away from the sound - generating ring cooperates with the second limiting portion. The second fixing hole is disposed on the second limiting portion.

[0011] As an alternative embodiment of the sound - generating feedback mechanism, a plurality of the guiding surfaces are sequentially provided 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 each of the guiding surfaces in sequence to generate sound, so as to produce continuous signal feedback.

[0012] An automatic injection device, which includes the sound - generating feedback mechanism according to any one of the above - mentioned embodiments.

[0013] Another object of the present invention is to provide an injection driving mechanism and an automatic injection device. The automatic injection device applying the injection driving mechanism has a simple structure and is easy to operate.

[0014] An injection driving mechanism for an automatic injection device, the automatic injection device comprising a protective sleeve and a housing, the injection driving mechanism comprising a guide tube, a push rod and a release sleeve, wherein an elastic arm of the guide tube cooperates with an engaging portion of the push rod to form a limiting assembly, the release sleeve is provided with a release opening, 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; axial movement of the protective sleeve drives axial movement of the release sleeve, when the release opening reaches the position of the elastic arm, the elastic arm springs outwards and separates from the engaging portion, the guide tube releases the limitation on the push rod, the push rod moves from the distal end to the proximal end, and the injection driving mechanism is released, the proximal end being the end close to the person receiving the injection.

[0015] As an alternative embodiment of the injection driving mechanism, the engaging portion comprises 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.

[0016] 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.

[0017] As an alternative embodiment of the injection driving mechanism, the push rod comprises a central hole with one end open, 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.

[0018] As an alternative embodiment of the injection driving mechanism, the injection driving mechanism further comprises a bottom cover, a guide rod is arranged 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.

[0019] As an alternative embodiment of the injection driving mechanism, a first fixing ring is arranged at one end of the guide tube with an end face, a hook is arranged on the bottom cover, and the hook is clamped with the first fixing ring to fix the bottom cover and the guide tube.

[0020] As an alternative embodiment of the injection driving mechanism, a second fixing ring is arranged at one end of the release sleeve, a third energy storage element is arranged on the outer periphery of the release sleeve, one end of the third energy storage element abuts against the first fixing ring, and the other end abuts against the second fixing ring.

[0021] As an alternative solution for the injection driving mechanism, a stop member is provided at one end of the guiding tube away from the end face. A limiting groove is provided on the release sleeve, and the limiting groove is arranged between the release port and the second fixing ring. The stop member abuts against one end of the limiting groove to limit the first extreme position of the release sleeve; the stop member abuts against the other end of the limiting groove to limit the second extreme position of the release sleeve.

[0022] As an alternative solution for the injection driving mechanism, the injection driving mechanism further includes a limiting ring, and the limiting ring is arranged 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.

[0023] As an alternative solution for 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 on the guiding tube.

[0024] As an alternative solution for 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.

[0025] As an alternative solution for the injection driving mechanism, the limiting hook is arranged 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 arranged between the two engaging blocks. The push rod moves, driving the pressing block to move to abut against the limiting hook to prevent the push rod from moving at high speed and causing the limiting hook to break out of the third fixing hole.

[0026] As an alternative solution for 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 limit the relative rotation of the release sleeve and the guiding tube.

[0027] An automatic injection device, which includes a housing, an injection mechanism, and an injection driving mechanism as described in any of the above solutions. Both the injection mechanism and the injection driving mechanism are arranged in the housing, and the injection mechanism is installed at one end of the injection driving mechanism close to the proximal end.

[0028] As an alternative solution for 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 limit the rotation of the release sleeve.

[0029] Another object of the present invention is to provide an automatic injection device that applies the above-mentioned sound feedback mechanism and the above-mentioned injection driving mechanism, so that the person receiving the injection can complete the injection alone and can control the injection process.

[0030] An automatic injection device, which includes the above-mentioned sound feedback mechanism and the above-mentioned injection driving mechanism.

[0031] Advantages of the present invention:

[0032] The sound feedback mechanism provided by the present invention is applied to an automatic injection device. The automatic injection device includes a guide tube. The sound feedback mechanism includes a sound-generating ring, a first energy storage element in an energy storage state, and a sound feedback component. The first energy storage element in an energy storage state provides kinetic energy for the sound-generating ring. The sound feedback component includes a guide surface and a termination surface. After the sound-generating ring gradually disengages from the abutment with the mounting surface, the sound-generating ring rotates under the action of the first energy storage element in an energy storage state and lands on the first abutment surface of the guide surface having a height difference from the mounting surface. The sound-generating ring collides with the first abutment surface to emit a "click" sound, which is the start prompt sound, to prompt the person receiving the injection that the injection has started. As the sound-generating ring moves to the inclined surface, the inclined surface causes the sound-generating ring to rotate, driving the first energy storage element in an energy storage state to continue storing energy. When the sound-generating ring reaches the second abutment surface, the energy storage of the first energy storage element ends, and the second abutment surface can prevent the sound-generating ring from rotating. The push rod continues to drive the sound-generating ring to move. When the sound-generating ring disengages from the abutment with the second abutment surface, the rotation of the sound-generating ring is no longer restricted. The first energy storage element in an energy storage state releases the torsional force it stores, driving the sound-generating ring to rotate. At the same time, the sound-generating ring lands on the termination surface having a height difference from the second abutment surface. The sound-generating ring collides with the termination surface to emit a "click" sound, which is the termination prompt sound, to prompt the person receiving the injection that the injection is about to end. The sound feedback mechanism provided by the present invention uses the first energy storage element in an energy storage state to provide 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 storage element in an energy storage state stores energy and drives the sound-generating ring to rotate. When the injection starts, the sound-generating ring collides with the first abutment surface to generate a start prompt sound; when the injection is about to end, the sound-generating ring collides with the termination surface to generate a termination prompt sound; effectively preventing the person receiving the injection from misjudging the injection process during the injection and causing harm. Moreover, the 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 feedback mechanism, improving the reliability and stability of the sound feedback mechanism, and reducing the cost at the same time.

[0033] A plurality of guiding surfaces can also be arranged along the tube 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 of the injection can hear a prompt sound at regular intervals. When the prompt sound can no longer be heard, it indicates that the injection is completed. The arrangement of the plurality of guiding surfaces enables the automatic injection device to continuously emit sound during the injection process, which has a more significant prompting effect on the elderly with insensitive reactions and the recipients of the injection with hearing impairments. The continuous sound can continuously remind the recipient 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 recipient of the injection from misjudging the injection process and causing harm during the injection process.

[0034] The automatic injection device applying the above sound feedback mechanism can emit obvious starting and ending prompt sounds during the injection process. It can not only enable the recipient of the injection to accurately master the injection process, but also has a more significant prompting effect on the elderly with insensitive reactions and the recipients of the injection 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.

[0035] The injection driving mechanism provided by the present invention applies a force from the proximal end to the distal end to the release sleeve on the injection driving mechanism. Through the cooperation of 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 by force to drive the release sleeve to move to a position where the elastic arm is located at the release port 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, and 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.

[0036] The automatic injection device provided by the present invention includes a housing, an injection mechanism, and the above injection driving mechanism. The injection driving mechanism and the injection mechanism are both installed in the housing. The injection mechanism is installed at one end of the injection driving mechanism close to the proximal end, and the injection driving mechanism is used to drive the injection mechanism to push the liquid medicine. This automatic injection device has a simple structure and is easy to operate, making it more convenient for the recipient of the injection to operate. Description of the Drawings

[0037] Figure 1 is a longitudinal sectional view of the automatic injection device provided by Embodiment 1 of the present invention;

[0038] Figure 2 is a schematic structural view of the injection driving mechanism provided by Embodiment 1 of the present invention;

[0039] Figure 3 is an exploded view of the injection driving mechanism provided by Embodiment 1 of the present invention;

[0040] Figure 4 is a longitudinal sectional view of the injection driving mechanism provided in the first embodiment of the present invention in the initial state;

[0041] Figure 5 is a longitudinal sectional view of the injection driving mechanism provided in the first embodiment of the present invention in the released state;

[0042] Figure 6 is a schematic structural diagram of the release sleeve provided in the first embodiment of the present invention;

[0043] Figure 7 is a schematic structural diagram of the guide tube provided in the first embodiment of the present invention Figure 1 ;

[0044] Figure 8 is Figure 7 a sectional view taken along the line A-A in

[0045] Figure 9 is a schematic structural diagram of the push rod provided in the first embodiment of the present invention Figure 1 ;

[0046] Figure 10 is a schematic structural diagram of the push rod provided in the first embodiment of the present invention Figure 2 ;

[0047] Figure 11 is a schematic structural diagram of the guide tube provided in the first embodiment of the present invention Figure 2 ;

[0048] Figure 12 is a schematic structural diagram of the bottom cover provided in the first embodiment of the present invention;

[0049] Figure 13 is a schematic structural diagram of the limiting ring provided in the first embodiment of the present invention;

[0050] Figure 14 is an assembly schematic diagram of the sound generating ring, the first energy storage element in the energy storage state and the push rod provided in the second embodiment of the present invention;

[0051] Figure 15 is a schematic structural diagram of the sound generating ring provided in the second embodiment of the present invention;

[0052] Figure 16 is a schematic structural diagram of the guide tube provided in the second embodiment of the present invention Figure 3 ;

[0053] Figure 17 is Figure 16 a sectional view taken along the line B-B in

[0054] Figure 18 is a force diagram of the push rod of the automatic injection device provided in the second embodiment of the present invention during injection;

[0055] Figure 19 It is the force diagram of the sound - generating ring of the automatic injection device provided in the second embodiment of the present invention during the injection process;

[0056] Figure 20 It 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;

[0057] Figure 21 It 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.

[0058] In the figure:

[0059] 100, housing; 101, outer shell; 102, protective sleeve;

[0060] 200, injection mechanism; 201, syringe barrel; 202, piston; 203, needle protection cap;

[0061] 1, guide tube; 11, mounting 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, clamping groove; 17, stopper; 18, first limiting protrusion; 19, third fixing hole;

[0062] 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;

[0063] 3, release sleeve; 31, release port; 32, second fixing ring; 321, second limiting protrusion; 33, limiting groove; 34, first limiting groove;

[0064] 4, sound - generating ring; 41, convex block; 411, sound - generating feedback surface; 412, first fixing hole;

[0065] 5, first energy - storage element;

[0066] 6, second energy - storage element;

[0067] 7, bottom cover; 71, guide rod; 72, hook;

[0068] 8, third energy - storage element;

[0069] 9, limiting ring; 91, limiting hook; 92, second chute. Detailed implementation manners

[0070] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the accompanying drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0071] 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 accompanying drawings. These are only for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0072] Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. 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.

[0073] Unless otherwise clearly specified and defined, the first feature being "above" or "below" 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 therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the first feature has a lower horizontal height than the second feature.

[0074] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0075] Embodiment 1:

[0076] As Figure 1As shown in the figure, this embodiment provides an automatic injection device, which includes a housing 100, an injection mechanism 200, and an injection driving mechanism. The injection mechanism 200 and the injection driving mechanism are both arranged inside 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.

[0077] 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 inside the syringe barrel 201; the injection needle can pass through the protective sleeve 102 and contact the skin of the person receiving the injection.

[0078] When using the automatic injection device, press the protective sleeve 102 on the skin surface of the person receiving the injection 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, one end of the protective sleeve 102 away from the proximal end acts on the injection driving mechanism, and the injection driving mechanism can drive the piston 202 to move from the distal end to the proximal end under the force, so as to push the liquid medicine through the injection needle into the body of the person receiving the injection and complete the automatic injection.

[0079] The automatic injection device provided in this embodiment includes a housing, an injection mechanism, and the above-mentioned injection driving mechanism. The injection driving mechanism and the injection mechanism are both installed inside the housing. The injection mechanism is installed at one end of the injection driving mechanism close to the proximal end. The injection driving mechanism is used to drive the injection mechanism to push the liquid medicine. The structure of this automatic injection device is simple and easy to operate, making it more convenient for the person receiving the injection to operate.

[0080] As Figures 2 - 13 As shown in the figure, this embodiment provides an injection driving mechanism for the above-mentioned automatic injection device. The injection driving mechanism includes a guide tube 1, a push rod 2, and a release sleeve 3. The push rod 2 is arranged inside the guide tube 1. The guide tube 1 is nested inside the release sleeve 3. When the release sleeve 3 is forced to move from the proximal end to the distal end, it can release the restriction on the axial movement of the push rod 2 by the guide tube 1, so that the push rod 2 moves from the distal end to the proximal end.

[0081] 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 opening 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 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 opening 31 reaches the position of the elastic arm 14, the elastic arm 14 springs outwards and separates from the engaging portion, and 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.

[0082] For the injection driving mechanism provided in this embodiment, by applying a force from the proximal end to the distal end to the release sleeve 3 on the injection driving mechanism, a limiting assembly is formed through the cooperation of the elastic arm 14 of the guide tube 1 and the engaging portion of the push rod 2. When the protective sleeve 102 is axially moved under force to drive the release sleeve 3 to move until the elastic arm 14 is located at the release opening 31 of the release sleeve 3, the elastic arm 14 springs outwards and separates from the engaging portion, so that the guide 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. This injection driving mechanism has a simple structure and more convenient operation.

[0083] 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 opening 31 to enable the guide tube 1 to release the restriction on the axial movement of the push rod 2. In the initial state, the elastic arm 14 is compressed by the tube wall of the release sleeve 3 and is 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 a position where the release opening 31 is above the elastic arm 14, the elastic arm 14 is released through the release opening 31, so that the guide tube 1 releases the restriction on the axial movement of the push rod 2.

[0084] 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 opening 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.

[0085] One end of the lug 141 near the distal end is provided with an inclined surface 142, and the inclined surface 142 is inclined 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 and engaged between the engagement ring 23 and the engagement block 24 by the inner wall of the release sleeve 3.

[0086] There are two elastic arms 14 and two engagement blocks 24. There are two engagement blocks on the engagement ring 23. Two engagement parts are formed between the two engagement blocks and the two engagement blocks 24. The two engagement parts are symmetrically arranged and cooperate with the two lugs 141 respectively to ensure the balanced force on the push rod 2.

[0087] Optionally, the inner wall of the guide tube 1 is provided with a first chute 15, and the engagement block 24 moves along the first chute 15 to limit the rotation of the push rod 2. In this embodiment, both the engagement block and the engagement block 24 move along the first chute 15, and the first chute 15 is also provided with two. The two first chutes 15 and the two engagement 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.

[0088] The inner wall of the guide tube 1 is provided with a first limiting strip 151 and a second limiting strip 152 at intervals, and a first chute 15 is formed between the first limiting strip 151 and the second limiting strip 152.

[0089] 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.

[0090] 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.

[0091] Since the length of 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 shift. As Figure 4 、 Figure 5 and Figure 12 shown, 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. The guide rod 71 provides guidance for the second energy storage element 6 to prevent the second energy storage element 6 from being twisted.

[0092] In this embodiment, the guide rod 71 needs to enter the central hole 25 through the end 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.

[0093] 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, 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, resulting in the skew of the guide rod 71, and then causing the skew of the thrust of the push rod 2 and the skew of the injection needle, which may cause harm to the person receiving the injection. The steel rod is injection - molded in the center of the bottom cover 7.

[0094] A first fixing ring 16 is provided at the end of the guide tube 1 with an end face, and 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 and the guide tube 1. The bottom cover 7 and the guide tube 1 are fixed by means of 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.

[0095] Two hooks 72 are oppositely arranged on the bottom cover 7. A clamping groove 161 is provided 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.

[0096] Of course, in other embodiments, the clamping groove 161 can also be provided on the outer periphery of the first fixing ring 16, and the two hooks 72 are engaged with the first fixing ring 16 from the outside of the first fixing ring 16.

[0097] 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 larger than the maximum outer diameters of the release sleeve 3 and the guide tube 1, so as to cooperate with the outer shell 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.

[0098] A second fixing ring 32 is provided at one end of the release sleeve 3. A third energy - storage element 8 is provided 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.

[0099] As an alternative to the automatic injection device, a second limiting protrusion 321 is provided at one end of the release sleeve 3 near the proximal end, and a second limiting groove is provided 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 subjected to the thrust of the protective sleeve 102, it can only move along the axis direction of the push rod 2.

[0100] The second limiting protrusion 321 is provided on the outer periphery of the second fixing ring 32, and the second limiting groove is provided on the inner wall of the outer shell 101. There are two relatively arranged second limiting protrusions 321. Correspondingly, there are also two relatively arranged second limiting grooves. 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.

[0101] Continue to refer to Figures 4 - 7 One end of the guide tube 1 away from the end face is provided with a stop member 17, and a limiting groove 33 is provided on the release sleeve 3. The limiting groove 33 is provided between the release port 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. In the initial state, the side of the stop member 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 stop member 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 stop member 17, it is possible to prevent the release sleeve 3 from detaching from the guide tube 1 when moving axially under force.

[0102] There are two stop members 17 and two limiting grooves 33. The two stop members 17 are symmetrically arranged with respect to the center line of the guide tube 1, and the limiting grooves 33 are symmetrically arranged with respect to the center line of the release sleeve 3. The two stop members 17 and the two limiting grooves 33 are in one-to-one correspondence and cooperation to ensure the balanced force of the release sleeve 3.

[0103] Continue to refer to Figure 6 and Figure 11, a first limiting groove 34 is provided on the inner wall of the release sleeve 3, and a first limiting protrusion 18 is provided 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. In order to prevent the release sleeve 3 and the guide tube 1 from rotating relative to each other under force, the first limiting protrusion 18 and the first limiting groove 34 cooperate to limit their relative rotation. Two first limiting grooves 34 are symmetrically arranged relative to the center line of the release sleeve 3, and the lengths of the two first limiting grooves 34 are the same as the length of the release sleeve 3. Correspondingly, two first limiting protrusions 18 are also provided, and the two first limiting protrusions 18 and the two first limiting grooves 34 are in one-to-one correspondence and cooperation to ensure the balanced force on the guide tube 1.

[0104] As Figure 13 shown, 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, and the limiting ring 9 is used to limit the extreme position of the push rod 2. The limiting 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.

[0105] A third fixing hole 19 is provided on the guide tube 1, and 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 on the guide tube 1. Through the cooperation of the limiting hook 91 and the third fixing hole 19, the fixation of the guide tube 1 and the limiting ring 9 is realized. Of course, the limiting ring 9 can also be fixed to the guide tube 1 by other means such as plugging or screwing.

[0106] 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.

[0107] Two limiting arms are arranged oppositely. The limiting 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 limiting arm and the second side wall of the other limiting arm, and the other engaging block 24 moves between the second side wall of one limiting arm and the first side wall of the other limiting arm until the engaging ring 23 abuts against the side of the limiting arm away from the proximal end.

[0108] Optionally, 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 away from the proximal end to the limiting hook 91. A pressing block 26 is arranged between the two engaging blocks 24. The push rod 2 moves, driving the pressing block 26 to move along the second sliding groove 92 to abut against the limiting hook 91 to limit the push rod 2 from moving at high speed so that the limiting hook 91 breaks out of the third fixing hole 19.

[0109] In this embodiment, two limiting hooks 91 are oppositely arranged on the peripheral wall of the limiting ring 9, and two third fixing holes 19 are arranged on the guiding tube 1. Correspondingly, two second sliding grooves 92 and pressing blocks 26 are also provided. This ensures the stability of the fixation of the limiting ring 9 and the balance of the force on the push rod 2.

[0110] The working principle of the injection driving mechanism provided in this embodiment is as follows:

[0111] 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 relative to the outer shell 101 from the proximal end to the distal end, 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 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 convex block 141 on the elastic arm 14 pops out from between the clamping 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 body of the person to be injected through the injection needle, completing the automatic injection.

[0112] Embodiment Two:

[0113] 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 One, or an injection driving mechanism with other structures.

[0114] 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 guiding tube 1 and a push rod 2. The sound feedback mechanism includes a sounding ring 4, a first energy storage element 5 in an energy storage state, and a sound feedback component. The sounding 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 sounding 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 sounding ring 4 to rotate around the axis of the push rod 2.

[0115] 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 generation feedback assembly includes a guide surface 12 and a termination surface 13 provided on the tube wall of the guide tube 1. The installation surface 11, the guide surface 12, and the termination surface 13 are arranged in sequence in the direction from the distal end to the proximal end, and there is a certain height difference in the circumferential direction of the guide tube 1 at one end of the installation surface 11 and the guide surface 12 close to the installation surface 11, one end of the guide surface 12 close to the termination surface 13, and the termination surface 13. The guide surface 12 includes a first abutment surface 121, a second abutment surface 123, and an inclined surface 122 for connecting the first abutment surface 121 and the second abutment surface 123. During the movement of the sound generating ring 4, when it moves from the installation surface 11 to the first abutment surface 121, a starting prompt sound is generated. When moving on the inclined surface 122 to drive the sound generating ring 4 to rotate, the first energy storage element 5 in the energy storage state can continue to store energy. When the sound generating ring 4 moves from the second abutment surface 123 to the termination surface 13, a termination prompt sound is generated.

[0116] 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, 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. 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 - storing element 5 in the energy - storing 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 - storing element 5 in the energy - storing 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 impacts with the first abutting surface 121 to emit a "click" sound, that is, the starting prompt sound, to prompt the injection recipient 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 - storing 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 - storing 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 - storing element 5 in the energy - storing 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 impacts with the termination surface 13 to emit a "click" sound, that is, the termination prompt sound, to prompt the injection recipient 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 - storing element 5 in the energy - storing 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 - storing element 5 in the energy - storing state drives the sound - generating ring 4 to rotate, generating a starting prompt sound when impacting with the first abutting surface 121 at the start of the injection; generating a termination prompt sound when impacting with the termination surface 13 when the injection is about to end; effectively preventing the injection recipient from misjudging the injection process and causing harm during the injection. 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.

[0117] 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 penetrates along the axial direction of the guiding tube 1, 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.

[0118] 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 auto - 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 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 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 auto - injection device is completed. The first limiting strip and the second limiting strip are also provided in two.

[0119] Of course, the lengths of the first limiting strip 151 and the second limiting strip 152 are not limited to the above 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.

[0120] 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.

[0121] The sound - generating feedback mechanism provided in this embodiment can adjust the sound volume of the ending prompt sound by adjusting the height difference between the second abutting surface 123 and the ending 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 ending surface 13 is the first limiting strip 151 of the other first chute 15.

[0122] Such as Figure 15 and Figure 17As shown, the outer surface of the sound ring 4 is provided with a protrusion 41, and the protrusion 41 includes a sound feedback surface 411. The sound feedback surface 411 is a side surface where the protrusion 41 is connected to the outer wall of the sound ring 4. The sound feedback surface 411 can abut against the mounting surface 11, and can sequentially cooperate with the guide surface 12 and the end surface 13. When the injection drive mechanism is in the initial state, the sound feedback surface 411 abuts against the mounting surface 11. As the push rod 2 drives the sound ring 4 and the first energy storage element 5 in the energy storage state to move from the distal end to the proximal end, the sound feedback surface 411 is separated from the abutment with the mounting surface 11. Under the action of the torsional force of the first energy storage element 5 in the energy storage state, the sound ring 4 rotates to the first abutment surface 121 of the guide surface 12 having a height difference with the mounting surface 11, and the sound feedback surface 411 collides with the first abutment surface 121 to produce a starting prompt sound. At this time, the energy of the first energy storage element 5 in the energy storage state is partially released, and the sound ring 4 moves along the inclined surface 122 driven by the push rod 2. The inclined surface 122 causes the sound ring 4 to rotate, causing the first energy storage element 5 to twist and store energy again, until the energy storage ends when it moves to the second abutment surface 123, and the sound ring 4 stops rotating. The sound ring 4 continues to move with the push rod 2. When it is completely out of contact with the second abutment surface 123, the rotation of the sound ring 4 is no longer restricted. The energy of the first energy storage element 5 in the energy storage state is released again, driving the sound ring 4 to rotate to the termination surface 13 with a height difference from the second abutment surface 123, and the sound feedback surface 411 collides with the termination surface 13 to produce a termination prompt sound.

[0123] In order to facilitate the processing of the guide surface 12 and the end surface 13, when processing the guide surface 12 and the end surface 13, a groove is firstly made on the guide tube 1 to form a guide surface 12 connecting the first abutting surface 121 and the second abutting surface 123 through the inclined surface 122, and a end surface 13 having a height difference with the guide surface 12.

[0124] In this embodiment, two protrusions 41 are provided, and the two protrusions 41 are arranged opposite to each other; accordingly, two mounting surfaces 11 and two sound feedback components are also provided.

[0125] like 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 in the bump 41, and a second fixing hole 221 is formed in the outer circumference 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 sound generating 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 sound generating 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 sound generating ring 4 to rotate, so that the sound generating 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, which can be heard more clearly by the recipient of the injection, and the recipient of the injection with long-term treatment and weak perception ability can also control the injection process.

[0126] 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 guiding 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 guiding 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 generated.

[0127] First limiting portions 21 and second limiting portions 22 are arranged at intervals on the outer surface of the push rod 2. The sound generating 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 sound generating 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 sound generating 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 sound generating ring 4 on the push rod 2 is restricted by the first limiting portion 21 and the second limiting portion 22 to prevent the sound generating ring 4 from separating 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.

[0128] 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.

[0129] The first limiting portion 21 includes two relatively arranged limiting platforms, and the second limiting portion 22 is arranged as an annular ring.

[0130] The engaging ring 23 is disposed close to the second limiting portion 22. To accommodate the length of the inserting 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 inserting portion of the torsion spring away from the sounding ring 4 is inserted into the second fixing holes 221 on the two fixing portions.

[0131] The working principle of the sound feedback mechanism of the automatic injection device provided in this embodiment is as follows:

[0132] 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 F 1 (not shown in the figure) from the distal end to the proximal end is 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 F 2 is generated on the push rod 2, and a radial counterclockwise tangential force F 3 is generated on the sounding ring 4. Under the action of F 1 , F 2 and F 3 , the latch and the engaging block 24 of the push rod 2 tend to fit the first chute 15, 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.

[0133] 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 convex block 41 slides into the guiding surface 12, and the sound generating feedback surface 411 of the convex block 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 convex block 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 convex block 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 remain relatively stationary 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 convex block 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 F 3 ), 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.

[0134] 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.

[0135] The working principle of the automatic injection device provided in this embodiment is as follows:

[0136] 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 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.

[0137] When the push rod 2 moves from the distal end to the proximal end, the thrust F received by 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 convex block 411 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 over.

[0138] 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 sliding groove 15. When the pressing block 26 on the push rod 2 moves to the second sliding groove 92 of the limiting ring 9 and the limiting 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 limiting hook 91 to rush out of the third fixing hole 19. The recipient of the injection hears the termination - prompt sound, and the drug solution pushing is completed. After the drug solution 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 in the release sleeve 3, and the engaging convex 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.

[0139] 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 process; moreover, it reduces the cost of the automatic injection device.

[0140] Embodiment Three:

[0141] For the recipient of the injection with high - dose drug solution infusion, if the infusion time is too long, the recipient of the injection may be confused about whether they missed the termination - prompt sound due to waiting for a long time to hear 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 is continuous sound - generating, 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 is completed.

[0142] 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.

[0143] 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 strikes each guiding surface 12 in sequence 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.

[0144] 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 strikes the first abutting surface 121 of the first guiding surface to generate sound, 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 strikes the first abutting surface 121 of the second guiding surface to generate sound, 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 strikes the termination surface 13 to emit a termination prompt sound, that is, during the injection process of the automatic injection device, a sound will be generated 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.

[0145] 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. 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.

[0146] 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. An automatic injection device, the automatic injection device comprising a sound feedback mechanism and an injection driving mechanism; the injection driving mechanism includes a guide tube (1), and the sound feedback mechanism includes a sound generating ring (4), a first energy storage element (5) in an energy storage state, and a sound feedback component, and the first energy storage element (5) in the energy storage state provides kinetic energy for the sound generating ring (4); the sound feedback component includes a guide surface (12) and a termination surface (13), Characterized in that, the guide 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). During the movement of the sound generating ring (4), when it moves from the mounting surface (11) of the guide tube (1) to the first abutting surface (121), a start prompt sound is generated. When the sound generating ring (4) moves on the inclined surface (122), driving the sound generating ring (4) to rotate can enable the first energy storage element (5) in the energy storage state to continue to store energy. When the sound generating ring (4) moves from the second abutting surface (123) to the termination surface (13), a termination prompt sound is generated; the injection driving mechanism further includes a push rod (2), and the axial movement of the push rod (2) drives the sound feedback mechanism to function; the push rod (2) only has axial movement from before the automatic injection device is triggered to after the automatic injection device is used up; the guide tube (1) has a first chute (15), and the push rod (2) has a clamping block (24), and the clamping block (24) axially moves along the first chute (15) to limit the rotation of the push rod (2).

2. The automatic injection device according to claim 1, Characterized in that, a convex block (41) is provided on the outer surface of the sound generating ring (4), the convex block (41) includes a sound feedback surface (411), the sound feedback surface (411) is a side surface where the convex block (41) is connected to the sound generating ring (4), and the sound feedback surface (411) can abut against the mounting surface (11) and can cooperate with the guide surface (12) and the termination surface (13) in sequence.

3. The automatic injection device according to claim 2, Characterized in that, the push rod (2) is arranged in the guide tube (1), the sound generating ring (4) and the first energy storage element (5) in the energy storage state are sleeved outside the push rod (2), one end of the first energy storage element (5) in the energy storage state is fixed to the sound generating ring (4), and the other end is fixed to the push rod (2).

4. The automatic injection device according to claim 3, Characterized in that, The first energy storage element (5) in the energy storage state is a torsion spring. A first fixing hole (412) is formed in the bump (41), and a second fixing hole (221) is formed in 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).

5. The automatic injection device according to claim 4, wherein, 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).

6. The automatic injection device according to any one of claims 1-5, wherein, a plurality of the guide surfaces (12) are sequentially arranged on the tube wall of the guide tube (1) between the mounting surface (11) and the termination surface (13). During the working process, the sounding ring (4) impacts and sounds with each of the guide surfaces (12) in sequence to generate continuous signal feedback.

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