Sound feedback system of automatic injection apparatus

Abstract

A sound feedback system of an automatic injection apparatus. The automatic injection apparatus comprises a needle protection sleeve (2), a trigger sleeve (9), a return spring (11), a start sound member (12), and an end cap (13). The outer wall of the trigger sleeve (9) is provided with an outer trigger structure (905). The outer trigger structure (905) is provided with an outer trigger inclined surface (9051). The inner surface of the start sound member (12) is provided with a first trigger inclined surface (1204). During use, the needle protection sleeve (2) is pressed down to push the trigger sleeve (9); the outer trigger inclined surface (9051) interacts with the first trigger inclined surface (1204) to drive the start sound member (12) to rotate, and the start sound member ultimately hits the end cap to produce a "start injection" sound signal. Triggering "injection" and triggering the "start injection sound" are accomplished by means of the same part, thereby ensuring that the start injection sound feedback is synchronized with the start of the actual injection action. The start sound member (12) and an end sound member (10) produce sounds by hitting the same end cap, which means that the two sound signals come from the same source, providing the patient with clear feedback for the start and end of the injection.

Description

An audible feedback system for an automatic injection device TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and more particularly to an audible feedback system for an automatic injection device. BACKGROUND

[0002] With the explosive growth of the population, the siphon effect of the city, the medical resources are increasingly scarce, the management of chronic diseases will occupy a large amount of medical resources, causing huge economic cost. Society puts forward higher requirements for the self-use injection device of patients, and people hope that the injection device is as simple as possible to operate and does not require special training. The traditional injection device usually needs to master the needle insertion angle and depth, and manually pushes the injection, which causes the injection effect of the drug to be different due to the proficiency of the user. With the development of pharmaceutical technology, more and more chronic diseases use periodic drug delivery. The traditional injection method is complicated and complex, and the patient may forget the use steps before each injection, which causes the drug to fail to play its due effect.

[0003] The emergence of the automatic injection device provides an effective solution to this problem. People hope that the injection device is simple to operate, has high patient compliance, and has multi-dimensional feedback during the injection process, such as hearing, vision, and touch. Patients can master the entire injection process by obtaining feedback signals, reduce anxiety, and improve confidence; at the same time, the needle insertion depth is stable and consistent, and the patient does not need to adjust it, and the needle tip is avoided from being exposed before and after injection to cause the fear of the patient; the injection process does not need to be manually pushed and the injection time is reasonable; after the injection is completed, the device should also have the functions of preventing accidental touch and / or preventing secondary use. At the same time, people pay more attention to personal privacy issues, and higher requirements are put forward for the miniaturization, portability, and usability of the product. How to realize the above functions and performance to meet the market demand is currently attracting more and more attention from engineering and technical personnel.

[0004] For example, Chinese patent CN116942962B discloses an automatic injection pen, which comprises a pre-filled syringe module, a guide sleeve provided with a guide groove, a push rod provided with a fin-shaped structure corresponding to the guide groove, a trigger sleeve provided with a spring, and a rib position corresponding to the fin-shaped structure. During the use of the injection pen, the spring is opened and the trigger sleeve is lowered, the trigger slope of the rib position pushes the fin-shaped structure to make the fin-shaped structure slide in the guide groove, the injection spring pushes the push rod to inject, and the spring frame is also lowered. This simplifies the number of parts, optimizes the assembly process, improves the assembly efficiency, and improves the safety of the assembly process.

[0005] During the injection process, the wing structure of the plunger moves in the guide groove of the guide sleeve from the distal end to the proximal end. When the injection is completed, the plunger moves to the proximal end limit position, at this time, the lower end surface of the plunger just moves to the hook surface of the long elastic arm of the injection spring bracket, the restriction of the deformation of the long elastic arm to the axial direction (inward) is released, because the hook surface of the spring bracket is inclined, under the reverse elastic force of the injection spring, the long elastic wall of the spring bracket deforms to the axial direction, the hook surface of the spring bracket is separated from the hook surface of the platform structure of the guide sleeve, the injection spring bracket is pushed to the distal end by the reverse elastic force of the injection spring, and finally impacts on the end cover to emit an impact sound, giving the user a sound feedback of the end of injection.

[0006] However, the patent does not provide sound feedback for starting injection, so that the injector suddenly performs injection when not ready, causing many troubles to the patient. SUMMARY

[0007] Therefore, the present application provides a sound feedback system of an automatic injection device, which comprises a needle protection sleeve 2, a trigger sleeve 9, a return spring 11, a starting sound member 12, and an end cover 13. An outer trigger structure 905 is arranged on the outer wall of the trigger sleeve 9, the outer trigger structure 905 is provided with an outer trigger inclined surface 9051, the inner surface of the starting sound member 12 is provided with a first trigger inclined surface 1204, and a certain distance is formed between the first lower end surface 1207 of the starting sound member 12 and the upper end surface 1303 of the end cover 13 through the support structure 1205 and the support arm 1301 before use. When the needle protection sleeve 2 is pressed downward during use, the trigger sleeve 9 is pushed, the outer trigger inclined surface 9051 interacts with the first trigger inclined surface 1204 to drive the trigger starting sound member 12 to rotate, when the containing groove 1206 of the starting sound member 12 rotates to the position of the support arm 1301 of the end cover 13, and at the same time, the support structure 1205 of the starting sound member 12 rotates to the position of the notch groove 1302 of the end cover 13, under the reverse thrust of the return spring 11, the starting sound member 12 moves downward quickly and finally impacts on the end cover 13 to emit a sound signal of “starting injection”, and at the same time, the inner trigger structure 902 of the trigger sleeve 9 pushes the wing structure 601 of the injection plunger 6 to trigger the “injection” action. The trigger “injection” and the trigger “starting injection sound” are completed by the same part (the trigger sleeve 9), so as to ensure that the sound feedback of starting injection is synchronous with the actual starting of the injection action; the starting sound member 12 and the ending sound member 10 emit sounds by impacting on the same part (the end cover 13), that is, the two sound signals are homologous, and the feedback of the patient starting injection and ending injection is clear.

[0008] The application discloses a sound feedback system of an automatic injection device, the automatic injection device is divided into two ends, namely a near end and a far end, the automatic injection device comprises a needle protection sleeve 2, a trigger sleeve 9, a return spring 11, a start sound component 12 and an end cover 13, one end of the needle protection sleeve 2 close to the far end is in abutment with one end of the trigger sleeve 9 close to the near end, and the trigger sleeve 9 is sleeved with one end of the start sound component 12 close to the far end, the other end of the start sound component 12 is in abutment with the end cover 13, the return spring 11 is sleeved on the outer periphery of the trigger sleeve 9, one end of the return spring 11 is in abutment with the trigger sleeve 9, and the other end of the return spring 11 is in abutment with the start sound component 12, an outer trigger structure 905 is arranged on the outer wall of the trigger sleeve 9, the outer trigger structure 905 is provided with an outer trigger inclined surface 9051, the inner surface of the start sound component 12 is provided with a first trigger inclined surface 1204, the start sound component 12 is provided with a supporting structure 1205 for supporting the start sound component 12 before triggering, the outer wall of the end cover 13 is provided with a notch groove 1302 for accommodating the supporting structure 1205 of the start sound component after triggering, the end cover 13 is provided with a supporting arm 1301 for supporting the start sound component 12, and the outer surface of the start sound component 12 is provided with an accommodating groove 1206 for accommodating the supporting arm 1301 of the end cover 13 after triggering, before use, the supporting structure 1205 of the start sound component 12 is supported on the upper end face 1303 of the end cover 13, the supporting arm 1301 of the end cover is supported at the first lower end face 1207 of the start sound component 12, a certain distance is formed between the first lower end face 1207 of the start sound component 12 and the upper end face 1303 of the end cover 13, in use, the needle protection sleeve 2 is pressed downwards, thereby pushing the trigger sleeve 9, the outer trigger inclined surface 9051 and the first trigger inclined surface 1204 interact, the start sound component 12 is driven to rotate, when the supporting structure 1205 of the start sound component 12 just rotates to the position of the notch groove 1302 of the end cover 13, at the same time, when the accommodating groove 1206 of the start sound component 12 rotates to the position of the supporting arm 1301 of the end cover 13, the downward limiting of the start sound component 12 is released, under the reverse thrust of the return spring 11, the start sound component 12 moves downwards rapidly, and finally collides with the end cover 13 to emit a sound signal of “start injection”.

[0009] In some embodiments, the bottom of the trigger sleeve 9 is provided with at least two connecting structures 906, and the inner surface of the start sound component 12 is provided with a limiting groove 1203, the limiting groove 1203 is matched with the connecting structures 906 before triggering, and the rotation of the start sound component 12 relative to the trigger sleeve 9 before triggering is limited.

[0010] In some embodiments, the upper end of the trigger sleeve 9 is provided with a first flange structure 903, the first flange structure 903 is provided with a first upper surface 9031, the needle protection sleeve 2 is provided with an elongated cantilever structure 201, the cantilever structure 201 is provided with a second lower end surface 2011, the upper end of the first flange structure 903 abuts against the lower end of the second lower end surface 2011.

[0011] In some embodiments, the trigger sleeve 9 is provided with an elastic arm 901, a blocking wall structure 904 is arranged at the middle of the elastic arm 901 below, the start sound member 12 is provided with a second upper surface 1201 and an upper surface flange structure 1202, before use of the injection pen, one end of the return spring 11 abuts against the lower surface of the blocking wall structure 904 of the trigger sleeve 9, the other end is sleeved on the upper surface flange structure 1202 of the start sound member 12, the end surface of the return spring 11 abuts against the second upper surface 1201 of the start sound member 12, the return spring 11 is limited between the trigger sleeve 9 and the start sound member 12, before use, the return spring 11 is in its longest position.

[0012] In some embodiments, the automatic injection device further comprises an injection push rod 6, an injection spring 7, a guide sleeve 8 and an end sound member 10, the guide sleeve 8 is sleeved outside the end sound member 10, one end of the end sound member 10 close to the distal end is sleeved with the end cap 13 through the start sound member 12, the injection spring 7 is sleeved on the end sound member 10, the injection push rod 6 is sleeved outside the injection spring 7, the injection push rod 6 is cylindrical and is provided with a central axis (X), the injection push rod 6 contains at least two wing structures 601, the wing structures 601 are centrally symmetrically distributed along the central axis (X), the trigger sleeve 9 is slidably assembled outside the guide sleeve 8, the trigger sleeve 9 is provided with an inner trigger structure 902 for triggering the wing structures 601 of the injection push rod 6 to perform injection action.

[0013] Further, the guide sleeve 8 is provided with a platform structure 801 and a guide chute 802, the guide chute 802 is provided with a limiting straight surface 8021 at the lower end, before use of the injection pen, the third upper surface 6011 of the wing structure 601 of the injection push rod 6 abuts against the limiting straight surface 8021 at the lower end of the guide chute 802 of the guide sleeve 8, at this time, the injection spring 7 is compressed between the injection push rod 6 and the end sound member 10, and the injection spring 7 is in the shortest position of compression, at this time, the deformation of the end sound member 10 in the direction of the central axis (inward) is limited by the injection push rod 6.

[0014] Further, the third upper surface 6011 of the wing structure 601 is a slope or a circular arc surface.

[0015] Further, the bottom of the inner trigger structure 902 is provided with an inner trigger slope 9021, the distance between the third upper surface 6011 of the wing-shaped structure 601 and the inner trigger slope 9021 is equal to the distance between the outer trigger slope 9051 of the outer trigger structure 905 and the first trigger slope 1204 of the sound starting member 12. When the trigger sleeve 9 is pushed to a certain position by the needle protection sleeve 2, the outer trigger slope 9051 of the outer trigger structure 905 of the trigger sleeve 9 will contact the first trigger slope 1204 of the sound starting member 12, and the inner trigger slope 9021 of the inner trigger structure 902 of the trigger sleeve 9 will contact the third upper surface 6011 of the wing-shaped structure 601 of the injection push rod 6. At this time, the patient continues to push, the trigger sleeve 9 will continue to move to the distal end, the outer trigger slope 9051 of the outer trigger structure 905 will push the sound starting member 12 to rotate along its central axis, and the inner trigger slope 9021 of the inner trigger structure 902 will push the injection push rod 6 to rotate along its central axis. When the needle protection sleeve 2 moves to contact the shell 4, the shell 4 limits the further movement of the needle protection sleeve 2. At this time, the outer trigger slope 9051 of the trigger sleeve 9 pushes the sound starting member 12 to rotate to the position where the limit of the sound starting member 12 downward is released, at which time the return spring 11 is in the maximum compression position, the sound starting member 12 moves downward quickly under the action of the reverse pushing force of the return spring 11, and finally collides with the end cover 13 to emit a "start injection" sound signal. At the same time, the inner trigger slope 9021 of the trigger sleeve pushes the injection push rod 6 to rotate to the maximum position, so that it is out of the limit of the limit straight surface 8021 of the guide sliding groove 802 of the guide sleeve 8, and the injection push rod 6 is no longer limited by the guide sleeve 8, and starts to move to the proximal end under the action of the upward elastic force of the injection spring 7, thereby pushing the piston to inject the liquid medicine into the human body, and the injection action starts.

[0016] In some embodiments, the end sound member 10 comprises a spring guide 1002 arranged in the middle and at least two elongated spring arms arranged on the left and right sides, each of which has a protruding hook 1001, the hook 1001 is provided with a hooking surface 10011 and an upper inclined surface 10012, the inner wall of the elastic arm 901 has three protrusions, two of which are symmetrically distributed on the first protrusions 9011, the upper and lower surfaces of which are flat, and the middle second protrusion 9012 has an inclined upper and lower surface, before use, the injection spring 7 is sleeved on the spring guide 1002 of the end sound member 10, the injection push rod 6 is sleeved outside the injection spring 7, and the injection push rod 6 is inside the elongated spring arm of the end sound member 10, the hooking surface 10011 of the hook 1001 of the end sound member 10 hooks on the platform structure 801 on the left and right sides of the guide sleeve 8, and the upper inclined surface 10012 of the hook 1001 abuts against the lower inclined surface of the middle second protrusion 9012 of the elastic arm 901 on the front and rear sides of the trigger sleeve 9.

[0017] Further, the hooking surface 10011 is an inclined surface, and the end cap 13 is further provided with a first bottom surface 1304, because the hooking surface 10011 of the hook 1001 of the end sound member 10 is an inclined surface, under the reverse (downward) elastic force of the injection spring 7, the elongated spring arm of the end sound member 10 deforms towards the axial direction, the hooking surface 10011 of the hook 1001 is disengaged from the hooking with the platform structure 801 of the guide sleeve 8, (as shown in FIG. 25) the end sound member 10 is pushed by the reverse elastic force of the injection spring 7 to the distal end, and finally impacts on the first bottom surface 1304 of the end cap 13 (as shown in FIG. 26) to emit an impact sound, giving the user an end sound feedback.

[0018] Further, the injection push rod 6 is provided with a notched end surface 602, when the injection is completed, the notched end surface 602 of the injection push rod 6 just moves to the upper surface of the hook 1001 on the elongated spring arm of the end sound member 10, and the restriction of the deformation of the elongated spring arm towards the axial direction (inward) is removed.

[0019] Further, the bottom of the end sound member 10 is provided with a hollow second bottom surface 1003 for emitting a larger sound when impacting.

[0020] In some embodiments, the automatic injection device further comprises a cap 1, a needle protection sleeve 2, a window 3, a housing 4, a pre-filled syringe module 5, before use (initial state), the pre-filled syringe module 5 is preloaded at the proximal end of the housing 4, surrounded by the window 3, the window 3 is transparent, the window 3 is covered by the housing 4, the housing 4 is provided with a window structure, through the window structure of the housing 4 and the window 3, the liquid medicine can be seen, the needle protection sleeve 2 is slidably assembled between the housing 4 and the window 3, and the cap 1 is provided on the opening of the proximal end of the housing 4.

[0021] The beneficial effects of the present application: the present application provides a sound feedback system of an automatic injection device, which comprises a needle protection sleeve 2, a trigger sleeve 9, a return spring 11, a start sound component 12 and an end cap 13, the outer wall of the trigger sleeve 9 is provided with an outer trigger structure 905, the outer trigger structure 905 is provided with an outer trigger slope 9051, the inner surface of the start sound component 12 is provided with a first trigger slope 1204, before use, a certain distance is formed between the first lower end surface 1207 of the start sound component 12 and the upper end surface 1303 of the end cap 13 through the support structure 1205 and the support arm 1301, when in use, the needle protection sleeve 2 is pressed down, thereby pushing the trigger sleeve 9, the outer trigger slope 9051 interacts with the first trigger slope 1204 to drive the trigger start sound component 12 to rotate, when the containing groove 1206 of the start sound component 12 rotates to the position of the support arm 1301 of the end cap 13, at the same time, the support structure 1205 of the start sound component 12 rotates to the position of the notch groove 1302 of the end cap 13, under the reverse thrust of the return spring 11, it moves downward quickly and finally collides with the end cap 13 to emit a "start injection" sound signal, at the same time, the inner trigger structure 902 of the trigger sleeve 9 pushes the fin structure 601 of the injection push rod 6 to trigger the "injection" action. The trigger "injection" and the trigger "start injection sound" are completed by the same part (the trigger sleeve 9), so as to ensure that the start injection sound feedback is synchronous with the actual start injection action; the start sound component 12 and the end sound component 10 emit sound by colliding on the same part (the end cap 13), that is, the two sound signals are homologous, which clearly feedbacks the start injection and the end injection to the patient. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is an exploded view of the overall structure of the automatic injection device of the present application.

[0023] Figure 2 is a half-sectional view of the trigger sleeve of the automatic injection device of the present application.

[0024] Figure 3 is a sectional view of the trigger sleeve of the automatic injection device of the present application.

[0025] FIG. 4 is a perspective view of a trigger sleeve of the automatic injection device of the present application.

[0026] FIG. 5 is a perspective view of a start sound member of the automatic injection device of the present application.

[0027] FIG. 6 is a schematic view of an end sound member of the automatic injection device of the present application.

[0028] FIG. 7 is a side view of an end cap of the automatic injection device of the present application.

[0029] FIG. 8 is a front view of the end cap of the automatic injection device of the present application.

[0030] FIG. 9 is a schematic view of a guide sleeve of the automatic injection device of the present application.

[0031] FIG. 10 is a perspective view of an injection plunger of the automatic injection device of the present application.

[0032] FIG. 11 is a perspective view of a needle guard sleeve of the automatic injection device of the present application.

[0033] FIG. 12 is a cross-sectional view of the overall structure of the automatic injection device of the present application before use.

[0034] FIG. 13 is a partial enlarged view A of FIG. 12.

[0035] FIG. 14 is a semi-cross-sectional view of the overall structure of the automatic injection device of the present application before use.

[0036] FIG. 15 is a partial enlarged view B of FIG. 14.

[0037] FIG. 16 is a cross-sectional view of the position of the trigger sleeve and the start sound member of the automatic injection device of the present application before use.

[0038] FIG. 17 is a partial enlarged view C of FIG. 16.

[0039] FIG. 18 is a semi-cross-sectional view of the position of the trigger sleeve and the start sound member of the automatic injection device of the present application before use.

[0040] FIG. 19 is a semi-cross-sectional view of the position of the trigger sleeve and the start sound member of the automatic injection device of the present application during use.

[0041] FIG. 20 is a semi-cross-sectional view of the position of the trigger sleeve and the injection plunger of the automatic injection device of the present application during use.

[0042] FIG. 21 is a semi-cross-sectional view of the overall structure of the automatic injection device of the present application during use.

[0043] FIG. 22 is a semi-cross-sectional view of the position of the trigger sleeve and the start sound member of the automatic injection device of the present application just before injection.

[0044] Figure 23 is a semi-cross sectional view of the position of the trigger sleeve and the injection plunger of the automatic injection device of the present application just before injection.

[0045] Figure 24 is a cross sectional view of the overall structure of the automatic injection device of the present application just before injection.

[0046] Figure 25 is a cross sectional view of the overall structure of the automatic injection device of the present application during injection.

[0047] Figure 26 is a cross sectional view of the overall structure of the automatic injection device of the present application after injection.

[0048] Main component symbol explanation Cap 1 Needle protection sleeve 2 Window 3 Housing 4 Pre-filled syringe module 5 Injection plunger 6 Injection spring 7 Guide sleeve 8 Trigger sleeve 9 End sound member 10 Return spring 11 Start sound member 12 End cap 13

[0049] The following detailed description will further describe the present application in conjunction with the above-mentioned figures. DETAILED DESCRIPTION

[0050] Example 1:

[0051] An automatic injection device sound feedback system, as shown in Figure 1, the injection pen includes cap 1 needle protection sleeve 2 window 3 housing 4 pre-filled syringe module 5 injection plunger 6 injection spring 7 guide sleeve 8 trigger sleeve 9 end sound member 10 return spring 11 start sound member 12 end cap 13.

[0052] As shown in Fig. 2, the trigger sleeve 9 is provided with elastic arms 901, the inner wall of which has three protrusions, two first protrusions 9011 on the sides are symmetrically distributed, the upper and lower surfaces of which are flat. The second protrusion 9012 in the middle has an inclined upper and lower surface. As shown in Fig. 5, the trigger sleeve 9 is provided with an inner trigger structure 902, the bottom of which is provided with an inner trigger inclined surface 9021 for triggering the wing-shaped structure 601 of the injection push rod 6 to perform an injection action.

[0053] As shown in Figs. 3 and 4, the upper end of the trigger sleeve 9 is provided with a first flange structure 903, which is provided with a first upper surface 9031. The middle part of the trigger sleeve is provided with a blocking wall structure 904 below the elastic arms 901. As shown in Fig. 4, the outer wall of the trigger sleeve is provided with an outer trigger structure 905, which is provided with an outer trigger inclined surface 9051 that interacts with the first trigger inclined surface 1204 of the start sound member 12 when triggered to drive the start sound member 12 to rotate. The bottom of the trigger sleeve is provided with at least two coupling structures 906 for coupling with the start sound member 12 before triggering to limit the rotation of the start sound member 12 relative to the trigger sleeve 9.

[0054] As shown in Fig. 5, the start sound member 12 is provided with a second upper surface 1201 and an upper surface flange structure 1202 for fixing the return spring 11. The inner surface of the start sound member 12 is provided with a limiting groove 1203 and a first trigger inclined surface 1204. The limiting groove 1203 cooperates with the coupling structure 906 before triggering to limit the rotation of the start sound member 12. The first trigger inclined surface 1204 interacts with the outer trigger inclined surface 9051 of the trigger sleeve 9 when triggered. The start sound member 12 is provided with a support structure 1205 for supporting the start sound member 12 before triggering to form a certain distance between the first lower end surface 1207 of the start sound member 12 and the upper surface of the end cover 13. The outer surface of the start sound member 12 is provided with a receiving groove 1206 for accommodating the support arm 1301 of the end cover after triggering.

[0055] As shown in Fig. 6, the end sound member 10 has at least two elongated elastic arms, each of which has a protruding hook 1001, the hook 1001 is provided with a hooking surface 10011 and an upper inclined surface 10012, the hooking surface 10011 is also inclined. The end sound member 10 has an elongated spring guide structure 1002 in the middle, which is provided with a hollow second bottom surface 1003 for making a louder sound when impacted.

[0056] As shown in Fig. 7, the end cap 13 is provided with a support arm 1301 for supporting the start sound member 12; the outer wall of the end cap 13 is provided with a notch groove 1302 for accommodating the support structure 1205 of the start sound member after triggering; as shown in Fig. 8, the end cap 13 is further provided with an upper end face 1303 and a first bottom face 1304, the upper end face 1303 is used for impacting the start sound member 12 to emit a start injection sound, and the first bottom face 1304 is used for impacting the end sound member 10 to emit an injection end sound. As shown in Fig. 9, the guide sleeve 8 is provided with a platform structure 801 and a guide sliding groove 802, the lower end of the guide sliding groove 802 has a limiting straight face 8021. The trigger sleeve 9 is slidably assembled on the periphery of the guide sleeve 8.

[0057] As shown in Fig. 10, the injection push rod 6 is in a cylindrical shape and is provided with a central axis (X), the injection push rod 6 at least contains two wing-shaped structures 601, the wing-shaped structures 601 are centrally symmetrically distributed along the central axis (X), the third upper surface 6011 of the wing-shaped structure 601 is a bevel or a circular arc surface, and the injection push rod 6 is provided with a notch end face 602. As shown in Fig. 11, the needle protection sleeve 2 is provided with an elongated cantilever structure 201, and the cantilever structure 201 is provided with a second lower end face 2011. The needle protection sleeve is slidably assembled between the outer shell 4 and the window 3.

[0058] As shown in Fig. 12, the injection pen has two ends, a proximal end and a distal end. Before use (initial state), the pre-filled syringe module 5 is pre-assembled at the proximal end of the injection pen and is surrounded by the window 3, the window 3 is a transparent part, the window 3 is covered by the outer shell 4, the outer shell 4 is provided with a window structure, and the liquid medicine can be seen through the window structure of the outer shell 4 and the window 3. As shown in Fig. 12, in the initial state, the injection spring 7 is sleeved on the spring guide rod 1002 of the end sound member 10, the injection push rod 6 is sleeved outside the injection spring 7, and the injection push rod 6 is inside the elongated elastic arm of the end sound member 10.

[0059] As shown in Fig. 13, in this state, the hooking surface 10011 of the catch 1001 of the end sound member 10 is hooked on the platform structure 801 on the left and right sides of the guide sleeve 8, and the upper bevel 10012 of the catch 1001 is abutted on the lower bevel of the middle second protrusion 9012 of the catch (901) on the front and back sides of the trigger sleeve 9. At this time, the deformation of the elongated elastic arm of the end sound member 10 towards the axial direction (inward) is limited by the injection push rod 6.

[0060] At this time, as shown in Fig. 14, Fig. 15, the third upper surface 6011 of the fin structure 601 of the injection push rod 6 abuts against the limiting straight surface 8021 at the lower end of the guide groove 802 of the guide sleeve 8. At this time, the injection spring 7 is compressed between the injection push rod 6 and the end sound member 10, and the injection spring 7 is at the shortest position of compression.

[0061] At the same time, as shown in Fig. 16, Fig. 17, one end of the return spring 11 abuts against the lower surface of the blocking wall structure 904 of the trigger sleeve 9, and the other end is sleeved on the upper surface flange structure 1202 of the start sound member 12, and the end surface abuts against the second upper surface 1201 of the start sound member 12. The return spring 11 is limited between the trigger sleeve 9 and the start sound member 12, and is at the longest position.

[0062] At the same time, as shown in Fig. 18, the support structure 1205 of the start sound member 12 is supported on the upper end surface 1303 of the end cap 13, and the support arm 1301 of the end cap is supported at the first lower end surface 1207 of the start sound member. At this time, as shown in Fig. 16, Fig. 17, the lower surface (2011) of the cantilever structure 201 of the needle protection sleeve 2 abuts against the first upper surface 9031 of the first flange structure 903 of the trigger sleeve 9.

[0063] In use, first, the patient needs to pull off the pen cap 1, then holds the injection pen shell 4 with the hand, aligns the upper end surface of the needle protection sleeve 2 with the injection position of the body, and presses the proximal end with force. The needle protection sleeve 2 pushes the trigger sleeve 9 to move to the distal end. Continue to push, the needle will pierce into the human body, when the trigger sleeve 9 is pushed to a certain position by the needle protection sleeve 2, as shown in Fig. 19, the outer trigger slope 9051 of the outer trigger structure 905 of the trigger sleeve will contact the first trigger slope 1204 of the start sound member 12, as shown in Fig. 20, the inner trigger slope 9021 of the inner trigger structure 902 of the trigger sleeve 9 will contact the third upper surface 6011 of the fin structure 601 of the injection push rod 6.

[0064] At this time, the patient continues to push, the trigger sleeve 9 will continue to move to the distal end, the outer trigger slope 9051 of the outer trigger structure 905 will push the start sound member 12 to rotate along the central axis thereof, and the inner trigger slope 9021 of the inner trigger structure 902 will push the injection push rod 6 to rotate along the central axis thereof, when the needle protection sleeve 2 moves to abut against the shell 4, the shell 4 limits the continuous movement of the needle protection sleeve 2.

[0065] At this time, the outer trigger slope 9051 of the trigger sleeve 9 will start to push the start sound member 12 to rotate to a certain position, at this time, the return spring 11 is at the maximum compression position, the support structure 1205 of the start sound member 12 is just rotated to the position of the notch slot 1302 of the end cap 13, at the same time, the containing slot 1206 of the start sound member 12 is rotated to the position of the support arm 1301 of the end cap 13, so the downward limit of the start sound member 12 is removed, under the reverse pushing force of the return spring 11, it moves quickly downward and finally collides with the end cap 13 to emit the sound signal of "start injection". After the collision, the support structure 1205 of the start sound member 12 falls into the notch slot 1302 of the end cap 13, and the containing slot 1206 of the start sound member 12 contains the support arm 1301 of the end cap 13 in the slot, as shown in FIG. 22.

[0066] At the same time, the inner trigger slope 9021 of the trigger sleeve will push the injection push rod 6 to rotate to the maximum position, so that it is separated from the limit straight surface 8021 of the guide slot 802 of the guide sleeve 8, as shown in FIG. 23. Without the restriction of the guide sleeve 8, the injection push rod 6 starts to move towards the proximal end under the upward elastic force of the injection spring 7, thereby pushing the piston to inject the liquid medicine into the human body, and the injection action starts. During the process of injecting the liquid medicine, the injection push rod 6 moves from the distal end to the proximal end. As shown in FIG. 24, when the injection is completed, the injection push rod moves to the limit position of the proximal end, at this time, the notch end face 602 of the injection push rod 6 is just moved to the top of the hook 1001 on the elongated elastic arm of the end sound member 10, and the restriction of the deformation of the elongated elastic arm towards the axis (inward) is removed, because the hooking surface 10011 of the hook 1001 of the end sound member 10 is a slope, under the reverse (downward) elastic pushing force of the injection spring 7, the elongated elastic arm of the end sound member 10 deforms towards the axis, and the hooking surface 10011 of the hook 1001 is separated from the hooking of the platform structure 801 of the guide sleeve 8, as shown in FIG. 25, the end sound member 10 is pushed to the distal end by the reverse elastic force of the injection spring 7, and finally collides with the first bottom surface 1304 of the end cap 13 (as shown in FIG. 26) to emit the collision sound, giving the user the sound feedback of the end of injection. Before and after the injection, the state and position of the injection push rod (8) and the end sound member 10 change, as shown in FIGS. 16, 24, 25 and 26.

[0067] The beneficial effects of this invention: This invention proposes a sound feedback system for an automatic injection device. The automatic injection device includes a needle protection sleeve 2, a trigger sleeve 9, a return spring 11, a start sound component 12, and an end cap 13. The outer wall of the trigger sleeve 9 is provided with an external trigger structure 905, which has an external trigger inclined surface 9051. The inner surface of the start sound component 12 is provided with a first trigger inclined surface 1204. Before use, a certain distance is formed between the first lower end face 1207 of the start sound component 12 and the upper end face 1303 of the end cap 13 by the support structure 1205 and the support arm 1301. During use, the needle protection sleeve 2 is pressed down. The protective sleeve 2 pushes the trigger sleeve 9, and the outer trigger inclined surface 9051 interacts with the first trigger inclined surface 1204 to drive the trigger start sound component 12 to rotate. When the receiving groove 1206 of the start sound component 12 rotates to the position of the support arm 1301 of the end cover 13, at the same time, the support structure 1205 of the start sound component 12 rotates to the position of the notch 1302 of the end cover 13. Under the reverse thrust of the return spring 11, it moves down quickly and finally hits the end cover 13 to emit a "start injection" sound signal. At the same time, the inner trigger structure 902 of the trigger sleeve 9 pushes the wing-shaped structure 601 of the injection push rod 6 to trigger the "injection" action. The trigger for "injection" and the trigger for "injection start sound" are accomplished by the same part (trigger sleeve 9), thus ensuring that the sound feedback for injection start is synchronized with the start of the actual injection action; the start sound component 12 and the end sound component 10 emit sound by striking the same part (end cap 13), that is, the two sound signals are from the same source, providing clear feedback to the patient on the start and end of injection.

[0068] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A sound feedback system for an automatic injection device, the automatic injection device being divided into two ends, a proximal end and a distal end, the automatic injection device comprising a needle protection sleeve (2), a trigger sleeve (9), a return spring (11), a start sound member (12), an end cap (13), the needle protection sleeve (2) abutting the trigger sleeve (9) at an end closest to the distal end, characterised in that: The trigger sleeve (9) is sleeved on one end of the start sound member (12) near the distal end, the other end of the start sound member (12) is in abutment with the end cover (13), the return spring (11) is sleeved on the outer periphery of the trigger sleeve (9), one end of the return spring (11) is in abutment with the trigger sleeve (9), the other end is in abutment with the start sound member (12), the outer wall of the trigger sleeve (9) is provided with an outer trigger structure (905), the outer trigger structure (905) is provided with an outer trigger slope (9051), the inner surface of the start sound member (12) is provided with a first trigger slope (1204), the start sound member (12) is provided with a support structure (1205) for supporting the start sound member (12) before triggering, the outer wall of the end cover (13) is provided with a notch groove (1302) for accommodating the support structure (1205) of the start sound member after triggering; the end cover (13) is provided with a support arm (1301) for supporting the start sound member (12), the outer surface of the start sound member (12) is provided with an accommodation groove (1206) for accommodating the support arm (1301) of the end cover (13) after triggering; before use, the support structure (1205) of the start sound member (12) is supported on the upper end surface (1303) of the end cover (13), the support arm (1301) of the end cover is supported at the first lower end surface (1207) of the start sound member, so that a certain distance is formed between the first lower end surface (1207) of the start sound member (12) and the upper end surface (1303) of the end cover (13), when using, the needle protection sleeve (2) is pressed downward, so as to push the trigger sleeve (9), the outer trigger slope (9051) interacts with the first trigger slope (1204), drives the trigger start sound member (12) to rotate, when the support structure (1205) of the start sound member (12) just rotates to the position of the notch groove (1302) of the end cover (13), at the same time, when the accommodation groove (1206) of the start sound member (12) rotates to the position of the support arm (1301) of the end cover (13), the downward limiting of the start sound member (12) is released, under the action of the reverse thrust of the return spring (11), the start sound member (12) moves downward quickly, and finally collides with the end cover (13) to emit a "start injection" sound signal.

2. A sound feedback system for an automatic injection device as defined in claim 1, wherein: The bottom of the trigger sleeve (9) is provided with at least two connecting structures (906), the inner surface of the start sound member (12) is provided with a limiting groove (1203), the limiting groove (1203) cooperates with the connecting structure (906) before triggering, and the rotation of the start sound member (12) relative to the trigger sleeve (9) before triggering is limited.

3. The audible feedback system of an automatic injection device of claim 1, wherein: The upper end of the trigger sleeve (9) is provided with a first flange structure (903), the first flange structure (903) is provided with a first upper surface (9031), the needle protection sleeve (2) is provided with an elongated cantilever structure (201), the cantilever structure (201) is provided with a second lower end surface (2011), the upper end of the first flange structure (903) is in contact with the lower end of the second lower end surface (2011).

4. The audible feedback system of an automatic injection device of claim 1, wherein: The trigger sleeve (9) is provided with an elastic arm (901), a blocking wall structure (904) is arranged at the middle part below the elastic arm (901), the start sound component (12) is provided with a second upper surface (1201) and an upper surface flange structure (1202), before use of the injection pen, one end of the return spring (11) is in contact with the lower surface of the blocking wall structure (904) of the trigger sleeve (9), the other end is sleeved on the upper surface flange structure (1202) of the start sound component (12), the end surface of the return spring (11) is in contact with the second upper surface (1201) of the start sound component (12), the return spring (11) is limited between the trigger sleeve (9) and the start sound component (12), before use, the return spring (11) is in its longest position.

5. The audible feedback system of an automatic injection device of claim 1, wherein: The automatic injection device further comprises an injection push rod (6), an injection spring (7), a guide sleeve (8) and an end sound component (10), the guide sleeve (8) is sleeved outside the end sound component (10), one end of the end sound component (10) close to the far end passes through the start sound component (12) and is sleeved with the end cover (13), the injection spring (7) is sleeved on the end sound component (10), the injection push rod (6) is sleeved outside the injection spring (7), the injection push rod (6) is cylindrical and is provided with a central axis (X), the injection push rod (6) contains at least two wing-shaped structures (601), the wing-shaped structures (601) are centrally symmetrically distributed along the central axis (X), the trigger sleeve (9) is slidably assembled on the periphery of the guide sleeve (8), the trigger sleeve (9) is provided with an inner trigger structure (902) for triggering the wing-shaped structures (601) of the injection push rod (6) to perform injection action.

6. A sound feedback system for an automatic injection device as defined in claim 5, wherein: The guide sleeve (8) is provided with a platform structure (801) and a guide chute (802), the guide chute (802) is provided with a limiting straight surface (8021) at the lower end, before use of the injection pen, the third upper surface (6011) of the wing-shaped structure (601) of the injection push rod (6) is in contact with the limiting straight surface (8021) at the lower end of the guide chute (802) of the guide sleeve (8), at this time, the injection spring (7) is compressed between the injection push rod (6) and the end sound component (10), and the injection spring (7) is in the shortest position of compression, at this time, the deformation of the end sound component (10) in the direction of the central axis (inward) is limited by the injection push rod (6).

7. A sound feedback system for an automatic injection device as defined in claim 5, wherein: Before use, the bottom of the inner trigger structure (902) is provided with an inner trigger slope (9021), and the distance between the third upper surface (6011) of the wing-shaped structure (601) and the inner trigger slope (9021) is equal to the distance between the outer trigger slope (9051) and the first trigger slope (1204). When the trigger sleeve (9) is pushed to a certain position by the needle protection sleeve (2), the outer trigger slope (9051) of the outer trigger structure (905) of the trigger sleeve (9) contacts the first trigger slope (1204) of the starting sound member (12), and the inner trigger slope (9021) of the inner trigger structure (902) of the trigger sleeve (9) contacts the third upper surface (6011) of the wing-shaped structure (601) of the injection push rod (6). At this time, the patient continues to push, the trigger sleeve (9) continues to move to the distal end, the outer trigger slope (9051) of the outer trigger structure (905) of the trigger sleeve (9) pushes the starting sound member (12) to rotate along the central axis, and the inner trigger slope (9021) of the inner trigger structure (902) pushes the injection push rod (6) to rotate along the central axis. When the needle protection sleeve (2) moves to be in contact with the shell (4), the shell (4) limits the continuous movement of the needle protection sleeve (2). At this time, the outer trigger slope (9051) of the trigger sleeve (9) pushes the starting sound member (12) to rotate to a position where the limit of the starting sound member (12) downward is released. At this time, the return spring (11) is in the maximum compression position, the starting sound member (12) moves downward quickly under the reverse pushing force of the return spring (11), and finally collides with the end cover (13) to emit a "start injection" sound signal. At the same time, the inner trigger slope (9021) of the trigger sleeve pushes the injection push rod (6) to rotate to the maximum position, so that it is separated from the limit straight surface (8021) of the guide sliding groove (802) of the guide sleeve (8), and the injection push rod (6) is not limited by the guide sleeve (8). Under the upward elastic force of the injection spring (7), the injection push rod (6) starts to move to the proximal end, thereby pushing the piston to inject the liquid medicine into the human body, and the injection action starts.

8. A sound feedback system for an automatic injection device as defined in claim 5, wherein: The end sound member (10) comprises a spring guide rod (1002) arranged in the middle and at least two slender elastic arms arranged on the left and right sides, each of the at least two slender elastic arms has a protruding hook (1001), the hook (1001) is provided with a hooking surface (10011) and an upper inclined surface (10012), the inner wall of the elastic arm (901) has three protrusions, the upper and lower surfaces of the first protrusions (9011) symmetrically distributed on the two sides are planes, and the upper and lower surfaces of the second protrusion (9012) in the middle are inclined surfaces, before use of the injection pen, the injection spring (7) is sleeved on the spring guide rod (1002) of the end sound member (10), the injection push rod (6) is sleeved outside the injection spring (7), and the injection push rod (6) is located inside the slender elastic arm of the end sound member (10), the hooking surface (10011) of the hook (1001) of the end sound member (10) is hooked on the platform structure (801) on the left and right sides of the guide sleeve (8), and the upper inclined surface (10012) of the hook (1001) abuts against the lower inclined surface of the middle second protrusion (9012) of the elastic arm (901) on the front and rear sides of the trigger sleeve (9).

9. A sound feedback system for an automatic injection device as defined in claim 8, wherein: The hooking surface (10011) is an inclined surface, and the end cap (13) is further provided with a first bottom surface (1304), because the hooking surface (10011) of the hook (1001) of the end sound member (10) is an inclined surface, under the reverse (downward) elastic force of the injection spring (7), the slender elastic arm of the end sound member (10) is deformed in the axial direction, the hooking surface (10011) of the hook (1001) is separated from the hooking of the platform structure (801) of the guide sleeve (8), and the end sound member (10) is pushed to the distal end by the reverse elastic force of the injection spring (7), and finally impacts the first bottom surface (1304) of the end cap (13), as shown in FIG. 26, to emit an impact sound and give the user an end sound feedback.

10. A sound feedback system for an automatic injection device as defined in claim 5, wherein: The injection push rod (6) is provided with a notched end surface (602), when the injection is completed, the notched end surface (602) of the injection push rod (6) just moves to the upper surface of the hook (1001) on the slender elastic arm of the end sound member (10), and the restriction of deformation of the slender elastic arm in the axial direction (inward) is removed.

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