CN111558109B

CN111558109B - Two-section type automatic injector with injection prompt sound

Info

Publication number: CN111558109B
Application number: CN202010363834.4A
Authority: CN
Inventors: 侯士双; 胡高扬; 陈常娇
Original assignee: Ningbo Ruiai Product Design Co ltd
Current assignee: Ningbo Ruiai Product Design Co ltd
Priority date: 2020-04-30
Filing date: 2020-04-30
Publication date: 2022-02-22
Anticipated expiration: 2040-04-30
Also published as: CN111558109A

Abstract

The invention discloses a two-section automatic injector with injection prompting sound, which has the technical scheme that the two-section automatic injector with the injection prompting sound comprises an upper shell, a lower shell, an injection medicine tube, an injection plunger, an injection spring, a trigger piece, a mounting frame, an upper slide seat, a lower slide seat and a locking spring.

Description

Two-section type automatic injector with injection prompt sound

Technical Field

The invention relates to an automatic injector, in particular to a two-section automatic injector with injection prompt sound.

Background

An auto-injector is a medical instrument that automatically injects a liquid drug in an injection tube into a patient. Since some diseases require patients to perform daily regular injections of drugs or products, auto-injectors are widely used for such regular injections of drugs or products in order to simplify treatment. An auto-injector is a medical device of the patient's own use. Since the patient is not a professional medical care provider, auto-injectors are currently required to give the user a notification sound when the auto-injector opens an injection of a drug in order to notify the user that the auto-injector has opened an injection of the drug.

Disclosure of Invention

In view of the shortcomings of the prior art, it is an object of the present invention to provide a two-stage automatic injector with injection prompt sound.

The above object of the present invention is achieved by the following technical solutions:

a two-section type automatic injector with injection prompt sound comprises a shell, an injection medicine tube, an injection plunger, an injection spring, a trigger piece, an installation frame, an upper sliding seat, a lower sliding seat and a locking spring, wherein the installation frame, the upper sliding seat, the lower sliding seat and the locking spring are installed on the shell; the lower sliding seat, the upper sliding seat and the locking spring are sequentially sleeved on the outer side of the mounting frame from bottom to top; the outer wall of the injection plunger is provided with a plunger locking block; the mounting frame is provided with a plunger placing hole for the sliding installation of the injection plunger and an injection chute for the sliding of the plunger locking block, a locking clamping groove for the clamping of the plunger locking block is formed in the side edge of the top of the chute, and the plunger locking block extends to the outer side of the mounting frame through the locking clamping groove; the mounting frame is provided with a limiting barrier strip on one side of the injection chute, which is far away from the locking clamping groove, and a locking gap is formed between the limiting barrier strip and the plunger locking block; the lower sliding seat is sleeved on the mounting frame along the axis direction of the mounting frame and transmits the thrust of the trigger piece to the upper sliding seat, and a rotary driving convex part is further arranged on the outer wall of the lower sliding seat; the lower sliding seat is also provided with an unlocking inclined plane which pushes the plunger locking block from the locking clamping groove to the injection sliding groove; the lower part of the upper sliding seat is sleeved outside the top of the lower sliding seat, and the upper sliding seat is provided with an impact ring surface which is right opposite to the top surface of the lower sliding seat; the upper sliding seat is also provided with a locking sliding block which is positioned in the locking gap and can be separated from an opening at the upper end of the locking gap after being driven by the lower sliding seat; when the locking slide block is arranged in the locking gap, the plunger locking block is limited in the locking clamping groove; the upper sliding seat is also provided with a rotary driving inclined plane for the abutment of the rotary driving convex part, and when the rotary driving convex part is in abutting fit with the rotary driving inclined plane, the upper sliding seat has a tendency of rotating along the circumferential direction from the plunger locking block to the limiting barrier strip; one end of the locking spring is abutted against the inner top wall of the shell, and the other end of the locking spring is abutted against the upper sliding seat.

Some automatic injectors available on the market also have the function of providing the user with a sound when injecting, and their principle is generally as follows: by increasing the distance from the bottom end of the injection plunger to the cartridge piston of the injection cartridge in the initial state, after the injection plunger is unlocked, the injection plunger impacts on the cartridge piston to make a prompt sound under the action of the injection spring. Because the casing of injection cartridge all adopts glass to make, when the striking of injection plunger on the piston of injection cartridge, the probability that the casing of injection cartridge takes place to damage promotes, has the potential safety hazard.

The principle of the two-stage automatic injector of the present invention providing a user with a notice of a noise at the start of injection is as follows:

1. when the two-section automatic injector starts to inject, a user pushes the trigger piece against the body of the user, and the trigger piece drives the lower sliding seat to slide upwards; 2. the rotary driving part of the lower sliding seat is abutted against the rotary driving inclined plane of the upper sliding seat, so that the upper sliding seat has the tendency of rotating along the circumferential direction from the plunger locking block to the limiting barrier strip, and the upper sliding seat overcomes the pressure of the locking spring and slides upwards as the locking sliding block is positioned in the locking gap and limited by the plunger locking block and the limiting barrier strip; 3 when the locking slide block slides out of the locking clearance, under the combined action of the rotary driving convex part, the rotary driving inclined plane and the locking spring, the upper sliding seat rotates along the circumferential direction from the plunger locking block to the limiting barrier strip, and the locking slide block slides to the other side of the limiting barrier strip; 4. under the action of the locking spring, the upper sliding seat slides downwards to enable the impact ring surface to impact on the top surface of the lower sliding seat, and a sound is generated. Meanwhile, when the locking slide block of the upper slide seat slides out of the locking gap, the unlocking inclined plane of the lower slide seat drives the plunger locking block to slide into the injection chute from the locking clamping groove, and the liquid medicine in the injection medicine tube is injected into the body of a user under the action of the injection spring. According to the two-section type automatic injector disclosed by the invention, the impact sound production of the upper sliding seat and the lower sliding seat is adopted to replace the impact sound production between the injection plunger and the medicine tube piston, so that the two-section type automatic injector is safer and more reliable.

In addition, before the two-section automatic injector is injected, the upper sliding seat enables the locking sliding block of the upper sliding seat to be positioned in the locking gap under the pressure action of the locking spring, the probability that the plunger locking block of the injection plunger accidentally slides into the injection sliding groove from the locking clamping groove is reduced, the probability that the two-section automatic injector is accidentally started in the transportation and storage process is also reduced, and the safety and reliability of the two-section automatic injector are improved.

The invention is further provided that the bottom of the locking slide block is provided with a slide block inclined plane which is arranged along the height direction and inclined towards the corresponding plunger locking block; the top of one side of the limiting barrier strip far away from the locking clamping groove is provided with a barrier strip inclined plane.

Through adopting above-mentioned technical scheme, when the locking slide block from the roll-off in the locking clearance, under the combined action of rotation drive convex part, rotation drive inclined plane and locking spring, go up the slide holder and take place to rotate along plunger locking piece to the circumferencial direction of spacing blend stop, the setting on slider inclined plane and blend stop inclined plane can reduce the probability of the locking slide block card at spacing blend stop top of going up the slide, helps realizing above-mentioned two segmentation autoinjectors and provides the function of suggestion sound for the user when beginning to inject.

The invention is further provided that the locking slider has a cavity which is open at the upper end.

When the two-section type automatic injector falls down from a certain height in an inverted state, the tail end of the two-section type automatic injector is impacted on the ground, at the moment, the upper sliding seat, the lower sliding seat and the trigger piece have downward kinetic energy, the locking spring is compressed to neutralize the part of the kinetic energy, and in the process of compressing the locking spring, if the compressed amount of the locking spring is large, the locking sliding block of the upper sliding seat is easy to slide out of a locking gap, so that the two-section type automatic injector is started accidentally. Wherein, if the elastic modulus of the locking spring is not changed and the dropping height is not changed, the compression amount of the locking spring is related to the weights of the upper slide seat, the lower slide seat and the trigger, and the greater the weights of the upper slide seat, the lower slide seat and the trigger, the greater the compression amount of the locking spring is, the more easily the two-stage automatic injector is accidentally started. Therefore, the cavity is formed in the locking slide block, so that the weight of the upper slide seat is reduced, and the probability of accidental starting of the two-section automatic injector when the two-section automatic injector falls to the ground is reduced.

The invention is further provided that the lower slider comprises a sleeve part and a support arm which is connected with the bottom of the sleeve part and is used for the trigger to abut against; the sleeve part is provided with a first convex part on the inner wall, and the first convex part is provided with a first impact surface which is matched with the impact ring surface to realize impact sound production.

By adopting the technical scheme, the lower sliding seat comprises the sleeve part and the supporting arm instead of being integrally designed into a sleeve structure, so that the weight of the lower sliding seat is reduced, the probability of accidental starting of the two-section type automatic injector when the two-section type automatic injector falls down to the ground is reduced, and the specific reason is consistent with the reason that the weight of the upper sliding seat is reduced, and the probability of accidental starting of the two-section type automatic injector when the two-section type automatic injector falls down to the ground is reduced.

The sleeve part is provided with a first impact surface matched with the impact ring surface, so that the contact area of the upper sliding seat and the lower sliding seat during impact is increased, the lower sliding seat can stably bear the impact of the upper sliding seat, and the safety and reliability of the two-section type automatic injector are improved.

The sleeve portion may have a first recess formed in an outer wall thereof corresponding to the first protrusion.

By adopting the technical scheme, the weight of the lower sliding seat is further reduced, and the probability of accidental starting when the two-section automatic injector falls down to the ground is further reduced. The sleeve portion is provided with the first empty groove, so that the thickness of a partial area, which is used for bearing the upper sliding seat to collide, of the lower sliding seat is reduced, the sound frequency of a prompt sound generated by the upper sliding seat and the lower sliding seat through collision is improved, the prompt sound is more clear and crisp, and the prompt effect is better.

The invention is further provided that the sleeve part is also provided with a second convex part matched with the plunger locking block on the inner wall of the sleeve part; the unlocking inclined plane is arranged on the second convex part, and the second convex part is also provided with a second impact surface which is matched with the impact ring surface to realize impact sound production; the sleeve portion has a second hollow groove formed in an outer wall thereof corresponding to the second protrusion.

By adopting the technical scheme, the sleeve part is provided with the second impact surface matched with the impact ring surface, so that the contact area of the upper sliding seat and the lower sliding seat during impact is increased, the lower sliding seat can stably bear the impact of the upper sliding seat, and the safety and reliability of the two-section type automatic injector are improved. The second empty groove is set, so that the weight of the lower slide seat is further reduced, and the probability of accidental starting when the two-section automatic injector falls to the ground in an inverted mode is further reduced.

The invention is further arranged that a slide guide groove is formed between the first convex part and the second convex part; the mounting bracket has with slide guide way cooperation slide guide part.

Through adopting above-mentioned technical scheme, the stability of sliding of lower slide on the mounting bracket has been promoted in the cooperation of slide guide way and slide guide part. The sliding seat guide groove is arranged between the first convex part and the second convex part, so that the lower sliding seat is kept compact in structure, the whole weight of the lower sliding seat is favorably controlled, and the probability that the two-section automatic injector is accidentally started when falling to the ground is favorably reduced.

The invention is further provided that the width of the locking gap is greater than the width of the locking slide; the top of the plunger locking block is provided with a first tangent plane matched with the inclined plane of the sliding block; the bottom of the plunger locking block is provided with a second tangent plane matched with the unlocking inclined plane.

Through adopting above-mentioned technical scheme, when unblock inclined plane butt when the second tangential plane, can drive plunger locking piece and slide towards the direction of injection slide, when the slider inclined plane cunning of locking slide block moved to the height of locking draw-in groove, the first tangential plane of plunger locking piece and the slider inclined plane cooperation of locking slide block for when locking slide block from the locking passageway roll-off, plunger locking piece can deviate from and enter into the injection spout in the locking draw-in groove more fast, help making the action that promotes the sound and begin the injection realize synchronous.

The invention is further provided that the outer wall of the mounting rack is also provided with a lock catch convex block, the lock catch convex block is provided with a first locking plane, and the upper sliding seat is provided with an elastic lock hook; when the impact ring surface impacts the top of the lower sliding seat, the hook part of the elastic lock hook is positioned above the lock catch convex block; when the two-section type automatic injector is taken down from a human body, the locking convex block is locked with the elastic locking hook.

Through adopting above-mentioned technical scheme, after above-mentioned auto-injector accomplished the injection, under the effect of locking spring, trigger piece, top slide and lower sliding seat all slide downwards, and the elasticity latch hook can slide to the below of hasp lug and realize the locking, has restricted trigger piece axial and upwards slided, helps protecting the syringe needle of injection pencil, avoids above-mentioned two segmentation auto-injectors to retrieve personnel and causes the injury in recovery process.

The invention is further provided that the trigger piece is provided with a protective convex ring at the circumferential direction of the inner wall of the bottom of the trigger piece; the two-section type automatic injector is further provided with a protective pen cap, and the protective pen cap is provided with a protective convex part clamped at the top of the protective convex ring.

By adopting the technical scheme, when the two-section automatic injector falls down from the ground in an inverted manner, the protective convex part of the inner cylinder of the pen cap abuts against the upper part of the protective convex ring of the trigger part to limit the downward sliding of the trigger part, so that the kinetic energy transmitted to the locking spring by the trigger part is reduced, and the probability of accidental starting of the automatic injector when the automatic injector falls from a high place in an inverted state is reduced.

In summary, the invention includes at least one of the following beneficial technical effects:

1. a two-section automatic injector with injection prompt sound comprises a shell, an injection medicine tube, an injection plunger, an injection spring, a trigger piece, a mounting rack, an upper slide seat, a lower slide seat and a locking spring, when the two-section automatic injector is started, the impact ring surface of the upper slide seat can impact on the lower slide seat to generate a prompt sound to remind a user that the two-section automatic injector starts to inject, before the injection of the two-section automatic injector, the upper sliding seat is pressed by the locking spring to enable the locking sliding block of the upper sliding seat to be positioned in the locking gap, the probability that the plunger locking block of the injection plunger accidentally slides into the injection chute from the locking clamping groove is reduced, the probability that the two-section automatic injector is accidentally started in the transportation and storage process is reduced, and the safety and reliability of the two-section automatic injector are improved;

2. the locking slide block is provided with a cavity with an opening at the upper end, so that the weight of the upper slide seat is reduced; the lower sliding seat comprises a sleeve part and a supporting arm, and is also provided with a first empty groove and a second empty groove, so that the weight of the lower sliding seat is reduced; the weight of the upper sliding seat and the lower sliding seat is reduced, the probability of accidental starting when the two-section automatic injector falls from a high place in an inverted state is reduced, and the safety and reliability of the two-section automatic injector are improved;

3. the bottom of the locking slide block is provided with a slide block inclined plane, so that when the locking plunger is installed, the plunger locking block of the locking plunger can enter the locking groove under the guidance of the slide block inclined plane, and the assembly of the two-section type automatic injector is facilitated;

4. the installation frame is provided with a lock catch convex block, the upper sliding seat is provided with an elastic lock hook matched with the lock catch convex block, and through the matching of the lock catch convex block and the elastic lock hook, the sliding of the trigger piece in the axial direction is limited after the two-section type automatic injector finishes injection, so that the probability that a recycling person is stabbed by an injection needle of an injection medicine tube is reduced in the process that the recycling person recycles the two-section type automatic injector;

5. the trigger part is provided with a protection convex ring, the protection pen cap is provided with a protection convex part, and when the two-section automatic injector falls down to the ground, the protection pen cap limits the falling of the trigger part, so that the kinetic energy transmitted to the locking spring by the trigger part is reduced, and the probability of accidental starting when the automatic injector falls down to the ground is reduced.

Drawings

Fig. 1 is a schematic structural view of a two-stage auto-injector with an injection prompt sound.

Fig. 2 is an exploded view of a two-piece auto-injector with an injection cue tone.

Fig. 3 is a cross-sectional schematic view of a two-piece auto-injector with an injection cue tone.

Fig. 4 is a schematic structural view of the syringe of the present invention.

Fig. 5 is a schematic sectional view of the syringe according to the present invention.

Fig. 6 is a schematic view of the explosion fit of the upper housing, mounting bracket and lower housing of the present invention.

Fig. 7 is a schematic view of the internal structure of the lower case of the present invention.

Fig. 8 is a schematic structural view of the trigger of the present invention.

Fig. 9 is a schematic structural view of the cartridge holder of the present invention.

FIG. 10 is a schematic view of the engagement of the trigger and the protective cap of the present invention.

Fig. 11 is a schematic view of the engagement of the mounting bracket and injection plunger of the present invention.

Fig. 12 is a schematic view of the injection plunger of the present invention.

Fig. 13 is an enlarged view at a in fig. 3.

Figure 14 is an exploded view of the cushion support assembly of the present invention.

Fig. 15 is a schematic view of the structure of the cushion support assembly within the mounting bracket after injection of the two-piece automatic injector with an injection cue tone is completed.

Fig. 16 is a schematic structural view of the lower slider in the present invention.

Fig. 17 is a schematic view of the bottom structure of the lower slider in the present invention.

Fig. 18 is a schematic structural view of an upper slider in the present invention.

Fig. 19 is a bottom structure view of the upper slider in the present invention.

Fig. 20 is a schematic view of the positions of the lock slide, limit stop, plunger lock and unlock ramp when the two-piece automatic injector with an injection cue tone is not starting an injection.

Fig. 21 is a schematic view of the position of the locking slide, the positive stop, the plunger locking block and the unlocking ramp when the locking slide is slid out of the locking gap.

In the figure: 11. an upper housing; 12. a lower housing; 121. an observation window; 122. a window convex part; 123. triggering the guide groove; 124. a carrier support ring; 1241. supporting the inner flanging; 13. a housing clamping hole; 2. injecting a medicine tube; 21. a glass outer tube; 22. a cartridge piston; 23. an injection needle; 24. a protective cover; 25. a liquid storage cavity; 26. a cartridge holder; 261. a medicine tube jack; 262. a bracket through hole; 3. a mounting frame; 31. an upper mounting portion; 311. a first card slot; 32. a lower mounting portion; 33. abutting the sheet; 34. a shell is buckled; 35. mounting a support column; 351. an injection chute; 352. locking the clamping groove; 353. a limiting barrier strip; 3531. a barrier strip inclined plane; 354. a locking gap; 355. a first slide guide projection; 356. a second slide guide projection; 357. a third slide guide projection; 358. a locking lug; 3581. a first locking surface; 359. a limiting lug; 36. mounting holes; 361. a first limit groove; 362. a second limit groove; 363. a jaw abutment; 37. a plunger placement hole; 38. positioning the inserted column; 39. triggering the through groove; 41. an injection plunger; 411. a plunger locking block; 4111. a first section; 4112. a second section; 412. a spring placement hole; 413. limiting cutting grooves; 42. an injection spring; 5. a buffer support assembly; 51. a buffering top seat; 511. a top seat plate; 512. an elastic claw; 5121. a jaw head; 52. a buffer spring; 53. a buffer base; 531. a first buckle; 54. a buffer gap; 61. an upper slide base; 611. an impact ring surface; 612. locking the slide block; 6121. a slider ramp; 613. a rotation driving groove; 6131. rotating the driving surface; 614. an elastic latch hook; 6141. a second locking surface; 62. a lower slide base; 621. a sleeve portion; 6211. a rotation driving protrusion; 62111. a convex part inclined plane; 6212. a first convex portion; 62121. a first impact surface; 6213. a first empty slot; 6214. a second convex portion; 62141. unlocking the inclined plane; 62142. a second impact surface; 6215. a second empty slot; 62161. a first slider guide groove; 62162. a second carriage guide slot; 62163. a third slide guide groove; 622. a support arm; 6221. triggering the abutting groove; 7. a locking spring; 8. a trigger; 81. a protective cylinder; 811. a protective convex ring; 82. triggering the inserting sheet; 821. an insert through hole; 822. triggering the guide bar; 823. triggering a guide block; 9. a protective pen cap; 91. an inner barrel of the pen cap; 92. a protective spring plate; 93. a protective protrusion.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In the present invention, a direction close to the injection end of the two-stage automatic injector having the injection cue sound is defined as a lower direction, and a direction away from the injection end of the two-stage automatic injector having the injection cue sound is defined as an upper direction.

Referring to fig. 1 and 2, the two-section automatic injector with injection prompt sound disclosed by the present invention comprises a housing, a locking spring 7, an upper sliding seat 61, a lower sliding seat 62, a mounting frame 3, an injection spring 42, an injection plunger 41, a buffer support assembly 5, an injection cartridge 2, a cartridge holder 26, a trigger 8 and a protective cap 9.

In this embodiment, the housing of the two-part auto-injector comprises an upper housing 11 and a lower housing 12.

Referring to fig. 4 and 5, the injection cartridge 2 includes a glass outer tube 21, a cartridge piston 22, an injection needle 23, and a protective cover 24. The glass outer tube 21 is made of transparent glass and has a liquid storage cavity 25 for storing the liquid medicine. The cartridge piston 22 is slidably and sealingly arranged in the reservoir cavity 25, and when the cartridge piston 22 is pushed towards the injection needle 23, the liquid medicine stored in the reservoir cavity 25 can be discharged from the injection needle 23. The protecting cover 24 is disposed at the end of the glass outer tube 21 and covers the injection needle 23.

Referring to fig. 6, the mounting bracket 3 includes upper and lower mounting

portions

31 and 32 to which the upper and

lower cases

11 and 12 are mounted, respectively. The mounting bracket 3 is further provided with an abutment piece 33 between the upper mounting portion 31 and the lower mounting portion 32. When the upper case 11 and the lower case 12 are mounted on the mounting frame 3, both the end portion of the upper case 11 and the end portion of the lower case 12 abut on the abutting piece 33. The upper housing 11 and the lower housing 12 are each provided with a housing catching hole 13. The upper mounting portion 31 and the lower mounting portion 32 are each provided with a housing catch 34 which is bayonet-fitted to the housing. When the upper and

lower cases

11 and 12 are mounted on the mounting frame 3, the case snaps 34 snap into the corresponding case snap holes 13.

Referring to fig. 6 and 7, the lower housing 12 is a hollow tubular structure, and two observation windows 121 are symmetrically formed in the circumferential direction of the side wall. The inner wall of the lower case 12 is provided with a window protrusion 122 along the edge of the observation window 121. The lower housing 12 is provided with an axially arranged trigger guide 123 on its inner wall between the two viewing window protrusions 122. Wherein, trigger guide slot 123 and be the spout that the top open-ended and bottom sealed. The lower housing 12 is also provided with a bracket support ring 124 that connects the bottoms of the two window protrusions 122. The bottom edge of carrier support ring 124 is bent inward to form a support cuff 1241.

Referring to fig. 7 and 8, the trigger 8 sequentially includes, from bottom to top, a protective cylinder 81 and two trigger insertion sheets 82 symmetrically arranged in the circumferential direction. The protective cylinder 81 has a protective collar 811 at the inner edge of its bottom. The trigger insert 82 has a plurality of insert through holes 821 formed through the inner and outer surfaces thereof at intervals in the longitudinal direction thereof, and a trigger bar 822 extending downward is provided at the upper edge of the insert through hole 821 at the lowermost end. The trigger bar 822 has a certain elasticity. The end of the trigger guide 822 is provided with a trigger guide 823 which is fitted with the trigger guide groove 123. When the trigger 8 is mounted on the lower housing 12, the two trigger insertion pieces 82 of the trigger 8 are respectively located between the two window protrusions 122, and the trigger guide 823 slides into the trigger guide groove 123 of the lower housing 12.

Referring to fig. 2, 7 and 9, the cartridge holder 26 has a cartridge insertion hole 261 for mounting the injection cartridge 2, and a holder through-hole 262 for passing the injection needle 23 and the protective cover 24 is opened at a bottom surface of the cartridge insertion hole 261. The cartridge holder 26 is mounted in the lower housing 12 and the bottom end of the cartridge holder 26 abuts against a support flange 1241 of the holder support ring 124. The top of the cartridge holder 26 has a holder flange that rests on top of the window ledge 122.

Referring to fig. 3 and 10, the protective cap 9 is fastened to the bottom end of the lower housing 12 and has a cap inner cylinder 91 into which the protective cap 24 of the drug injection tube 2 is inserted. The protective pen cap 9 is symmetrically provided with a notch on the outer wall of the protective pen cap in the circumferential direction, and a protective elastic sheet 92 extending downwards is arranged on the upper edge of the notch. The protective elastic piece 92 is provided with a protective protrusion 93 on the outer side surface thereof. When the protective cap 9 is fastened to the bottom end of the lower housing 12, the protective tube 81 of the trigger 8 extends into the protective cap 9 and is located outside the cap inner tube 91, and the protective protrusion 93 abuts against the top edge of the protective protrusion 811.

Referring to fig. 3, 11 and 13, the mounting bracket 3 is further provided with a hollow mounting pillar 35 connected to the top center of the upper mounting portion 31. The bottom of the mounting bracket 3 is opened with a mounting hole 36 and a plunger mounting hole 37 is coaxially provided at the bottom of the mounting hole 36. The top wall of the plunger placement hole 37 is provided with a positioning stud 38 extending downward and coaxially arranged.

The injection spring 42 and the injection plunger 41 are both mounted in the plunger placement hole 37. The injection spring 42 is sleeved outside the positioning plug 38. Injection plunger 41 is axially slidably mounted in plunger placement hole 37 and has a spring placement hole 412 into which injection spring 42 is inserted.

Referring to fig. 11 and 12, the injection plunger 41 is provided with two plunger locking blocks 411 circumferentially symmetrically on the top side wall thereof. The plunger lock block 411 has a rectangular parallelepiped shape as a whole. The injection plunger 41 is further provided with two limit slits 413 at its rear end in circumferential symmetry, the two limit slits 413 being located between the two plunger locking blocks 411. The top of the plunger locking block 411 has a first cut surface 4111; the bottom of the plunger locking block 411 has a second cut surface 4112.

The mounting column 35 has an injection chute 351 formed in a side wall thereof for allowing the plunger lock block 411 to axially slide. A locking slot 352 for the plunger locking block 411 to be clamped is formed in the circumferential direction of the top of the sliding groove. The mounting strut 35 is provided with an axially arranged stop web 353 on the side of the injection runner 351 remote from the locking notch 352. When the injection plunger 41 is mounted in the plunger placement hole 37 of the mounting bracket 3, the plunger locking block 411 of the injection plunger 41 is engaged in the locking groove 352 and extends to the outside of the mounting bracket, and a locking gap 354 is formed between the limit stopper 353 and the plunger locking block 411 locked in the locking groove 352. The limiting barrier 353 is provided with a barrier inclined plane 3531 at a side back to the locking slot 352, and the barrier inclined plane 3531 inclines downwards in a direction away from the corresponding locking slot 352.

Referring to fig. 3, 13 and 14, the cushion support member 5 is disposed in the mounting hole 36 of the mounting bracket 3. The buffering support assembly 5 comprises a buffering top seat 51, a buffering spring 52 and a buffering base 53 in sequence from top to bottom. Wherein the cushion top 51 and the cushion bottom 53 each have a through hole through which the injection plunger 41 passes.

Referring to fig. 11 and 14, two first buckles 531 are symmetrically arranged on the outer wall of the buffer base 53 in the circumferential direction. The lateral wall circumference symmetry of the last installation department 31 of mounting bracket 3 is equipped with the first draw-in groove 311 that supplies first buckle 531 joint and supply first buckle 531 axial to slide.

The buffering top seat 51 includes a top seat plate 511 and two elastic claws 512 connected to the top seat plate 511 and extending away from the buffering base 53. Two elastic claws 512 are arranged symmetrically in the circumferential direction. The elastic claws 512 are provided at their ends with claw heads 5121 extending in the axial direction of the cushion top base 51.

Referring to fig. 13 and 14, the bottom surface of the mounting hole 36 is sequentially formed with a first limiting groove 361 and a second limiting groove 362 which are engaged with the elastic claw 512. The width of the first limit groove 361 is greater than the width of the second limit groove 362, and a claw abutting part 363 is formed at the joint of the first limit groove 361 and the second limit groove 362. The first and

second limit grooves

361 and 362 are communicated with the plunger placement hole 37.

Referring to fig. 13, after the buffering support assembly is installed in the installation hole 36, the latch head 5121 of the elastic latch 512 abuts against the outer wall of the injection plunger 41, the elastic latch 512 is elastically deformed, and the elastic latch 512 abuts against the latch abutment 363, so that the buffering support assembly is positioned in the installation hole 36. At this time, a cushion gap 54 is formed between the top seat plate 511 of the cushion top seat 51 and the bottom surface of the mounting hole 36.

Referring to fig. 15, when the injection plunger 41 completes the injection under the action of the injection spring 42, the jaw head 5121 of the elastic jaw 512 of the buffering top seat 51 faces the limiting slot 413, the jaw head 5121 of the elastic jaw 512 is separated from the jaw abutting part 363 and extends into the limiting slot 413, the limiting support of the elastic jaw 512 is lost, the buffering top seat 51 slides upwards and impacts on the top surface of the mounting hole 36, and a second sound prompt sound is emitted to inform the user that the two-stage automatic injector has completed the injection.

Referring to fig. 11, the mounting bracket 3 is further provided with a trigger through slot 39 for the trigger insertion sheet 82 of the trigger 8 to axially penetrate.

Referring to fig. 2 and 3, the lower slide 62, the upper slide 61 and the locking spring 7 are sequentially sleeved on the outer side of the mounting pillar 35 from bottom to top.

Referring to fig. 11, 16 and 17, lower slide 62 is axially slidably mounted on mounting post 35 of mounting bracket 3. The lower slider 62 includes a sleeve portion 621 and two support arms 622 attached to the bottom of the sleeve portion 621. Two support arms 622 are arranged circumferentially and symmetrically, and the bottom of the support arms 622 is provided with trigger abutting grooves 6221 for inserting the tops of the trigger insertion sheets 82 of the trigger 8, so that when the trigger 8 slides upwards, the lower sliding seat 62 can synchronously slide upwards.

The sleeve portion 621 is provided at an inner wall thereof with two first protrusions 6212 arranged circumferentially symmetrically. The top surface of first lobe 6212 is a first impact surface 62121 that is flush with the top surface of lower slider 62. The sleeve portion 621 is circumferentially symmetrically arranged with two second protrusions 6214 on an inner wall thereof, the first protrusions 6212 and the second protrusions 6214 being arranged at intervals. The second protrusion 6214 has a second striking surface 62142 flush with the top surface of the lower slider 62 and an unlocking inclined surface 62141 for pushing the plunger locking piece 411 out of the locking notch (352), and the unlocking inclined surface 62141 is a cambered surface structure.

Referring to fig. 11, 15, and 16, the first and second

convex portions

6212 and 6214 are located on both circumferential sides of the support arm 622, respectively. A carriage guide groove is formed between the first convex portion 6212 and the second convex portion 6214. The mounting strut 35 is provided with a slide guide projection which cooperates with the slide guide groove. The carriage guide slots include a first carriage guide slot 62161 not located at the same peripheral angle as the support arm 622 and a second carriage guide slot 62162 located at the same peripheral angle as the support arm 622. The lower slider 62 is provided with a third slider guide groove 62163 communicating with the second slider guide groove 62162 on the inner wall of the support arm 622.

The slide guide projection includes a first slide guide projection 355 which covers the lower portion notch of the injection chute 351 and is slidably fitted into the first slide guide groove 62161, a second slide guide projection 356 which is slidably fitted into the second slide guide groove 62162, and a third slide guide projection 357 which is slidably fitted into the third slide guide groove 62163. The first guide projection is provided with a stopper projection 359 supported on the bottom surface of the sleeve portion 621 on both left and right sides.

In order to further reduce the weight of the lower slider 62, the sleeve portion 621 is opened with a first empty groove 6213 in an outer wall corresponding to the first convex portion 6212, and a distance between a top surface of the first empty groove 6213 and a top surface of the sleeve portion 621 is not more than 5 mm. The sleeve portion 621 has a second hollow 6215 formed in an outer wall corresponding to the second projection 6214.

The lower carriage 62 is further provided with a rotary driving protrusion 6211 between the first hollow groove 6213 and the second hollow groove 6215. The top of the rotational drive lobe 6211 is provided with a lobe ramp 62111.

Referring to fig. 2 and 18, the lower portion of the upper slide 61 is sleeved on the top outer side of the lower slide 62.

Referring to fig. 17 and 19, upper shoe 61 has an impact annulus 611 opposite the top surface of lower shoe 62. The upper slider 61 is provided with a rotation driving groove 613 into which the rotation driving protrusion 6211 of the lower slider 62 is inserted, and the rotation driving groove 613 has a rotation driving surface 6131 which is in contact with the protrusion inclined surface 62111. When the lower slide 62 drives the upper slide 61 to slide upward synchronously, the upper slide 61 has a tendency to rotate in the circumferential direction from the plunger locking block 411 to the limit stopper 353 due to the cooperation of the convex inclined surface 62111 and the rotation driving surface 6131.

Referring to fig. 11 and 18, the upper slider 61 is further provided with a locking slider 612 which is located in the locking gap 354 and can be disengaged from the upper end opening of the locking gap 354 after being driven by the lower slider 62. The bottom surface of the locking slider 612 is provided with a slider inclined surface 6121, and the slider inclined surface 6121 is inclined toward the corresponding plunger locking block 411 along the height direction. The locking slider 612 is a hollow cavity with an open upper end. When the lock slide 612 is placed in the lock gap 354, the plunger lock 411 is placed in the lock slot 352 and cannot slide into the injection chute 351.

Referring to fig. 11, 16 and 19, the width of the locking slider 612 is less than the width of the locking gap 354. In the process of starting the two-stage automatic injector, when the slider inclined plane 6121 of the locking slider 612 is aligned with the plunger locking block 411 in the locking slot 352, the plunger locking block 411 slides towards the locking slider 612 under the driving of the unlocking inclined plane 62141 of the lower sliding seat 62, so that when the locking slider 612 slides out of the locking channel, the plunger locking block 411 can be more quickly separated from the locking slot 352 and enters the injection sliding slot 351, and the prompt sound and the injection starting action are synchronized.

Referring to fig. 11 and 18, the outer wall of the mounting post 35 is also provided with a locking projection 358. The bottom surface of the locking projection 358 is a first locking surface 3581 that is perpendicular to the axis of the mounting post 35. The upper sliding seat 61 is provided with an elastic locking hook 614 which is matched with the locking protrusion 358, and the top surface of the elastic locking hook 614 is a second locking surface 6141 which is parallel to the first locking surface 3581. When the striking ring surface 611 of the upper slide 61 strikes the top of the lower slide 62, the hook of the elastic latch hook 614 is above the latch projection 358. When the two-section automatic injector is taken down from a human body, the trigger 8, the lower sliding seat 62 and the upper sliding seat 61 slide down in the axial direction and reset under the driving of the locking spring 7, the locking lug 358 is locked with the elastic locking hook 614, and the second locking surface 6141 is positioned below the first locking surface 3581.

Referring to fig. 1 to 21, the two-stage automatic injector with injection prompt sound may be used as follows:

1. the user takes down the protective cap 9 of the two-stage automatic injector and the protective cap 24 of the drug injection tube 2 to expose the injection needle 23 of the drug injection tube 2;

2. the user presses down the end of the two-stage automatic injector which exposes the injection needle 23 to the area to be injected in the body, so that the injection needle 23 is inserted subcutaneously, and the trigger 8 slides away from the body (towards the tail end of the two-stage automatic injector) due to the obstruction of the body;

3. the trigger 8 drives the lower slide carriage 62 and the upper slide carriage 61 to move up synchronously, the locking slide block 612 of the upper slide carriage 61 slides upwards in the locking gap 354, and the plunger locking block 411 also slides towards the locking slide block 612 under the driving of the unlocking inclined plane 62141 of the lower slide carriage 62;

4. when the locking slider 612 slides out of the locking gap 354, under the combined action of the locking spring 7, the rotary driving convex part 6211 and the rotary driving surface 6131, the upper sliding seat 61 rotates and slides downwards along the circumferential direction from the plunger locking block 411 to the limit barrier 353, so that the impact ring surface 611 of the upper sliding seat 61 impacts on the top surface of the lower sliding seat 62 to make a first sound prompt sound, and at the moment, the hook part of the elastic locking hook 614 is positioned above the locking convex part 358; meanwhile, as the plunger locking block 411 is not obstructed by the locking slide block 612, the plunger locking block 411 slides into the injection chute 351 from the locking clamping groove 352, the injection plunger 41 abuts against the medicine tube piston 22 of the injection medicine tube 2 under the action of the injection spring 42, and the medicine liquid in the injection medicine tube 2 is injected into the body of the user;

5. when the injection plunger 41 finishes injection under the action of the injection spring 42, the jaw head 5121 of the elastic jaw 512 of the buffering footstock 51 is opposite to the limiting cutting groove 413, the jaw head 5121 of the elastic jaw 512 is separated from the jaw abutting part 363 and extends into the limiting cutting groove 413, the limiting support of the elastic jaw 512 is lost, the buffering footstock 51 slides upwards and impacts the top surface of the mounting hole 36, and a second sound prompt sound is emitted, so that a user can know that the two-section type automatic injector finishes injection;

6. after the user takes the two-section automatic injector off the body, under the action of the locking spring 7, the trigger 8, the lower slide 62 and the upper slide 61 all reset in the axial direction, the locking lug 358 is locked with the elastic locking hook 614, and the second locking face 6141 is located below the first locking face 3581, so that the upward axial movement of the trigger 8 is limited.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A two-section type automatic injector with injection prompt sound comprises a shell, an injection medicine tube (2), an injection plunger (41), an injection spring (42) and a trigger (8), and is characterized by further comprising a mounting frame (3), an upper sliding seat (61), a lower sliding seat (62) and a locking spring (7), wherein the mounting frame is mounted on the shell; the lower sliding seat (62), the upper sliding seat (61) and the locking spring (7) are sequentially sleeved on the outer side of the mounting frame (3) from bottom to top;

the outer wall of the injection plunger (41) is provided with a plunger locking block (411);

the mounting frame (3) is provided with a plunger placing hole (37) for the injection plunger (41) to slide and an injection sliding groove (351) for the plunger locking block (411) to slide, a locking clamping groove (352) for the plunger locking block (411) to be clamped in is formed in the side edge of the top of the sliding groove of the mounting frame (3), and the plunger locking block (411) extends to the outer side of the mounting frame (3) through the locking clamping groove (352); a limiting stop strip (353) is arranged on one side, away from the locking clamping groove (352), of the injection sliding groove (351) of the mounting frame (3), and a locking gap (354) is formed between the limiting stop strip (353) and the plunger locking block (411);

the lower sliding seat (62) is sleeved on the mounting frame (3) along the axial direction of the mounting frame (3) and transmits the thrust of the trigger piece (8) to the upper sliding seat (61), and a rotary driving convex part (6211) is further arranged on the outer wall of the lower sliding seat (62); the lower sliding seat (62) is also provided with an unlocking inclined surface (62141) which pushes the plunger locking block (411) from the locking clamping groove (352) to the injection chute (351);

the lower part of the upper sliding seat (61) is sleeved on the outer side of the top of the lower sliding seat (62), and the upper sliding seat (61) is provided with an impact ring surface (611) which is opposite to the top surface of the lower sliding seat (62); the upper sliding seat (61) is also provided with a locking sliding block (612) which is positioned in the locking gap (354) and can be disengaged from an upper end opening of the locking gap (354) after being driven by the lower sliding seat (62); when the locking slider (612) is placed in the locking gap (354), the plunger locking block (411) is trapped within the locking slot (352); the upper sliding seat (61) is also provided with a rotary driving inclined surface for abutting of the rotary driving convex part (6211), and when the rotary driving convex part (6211) is abutted and matched with the rotary driving inclined surface, the upper sliding seat (61) has a tendency of rotating along the circumferential direction from the plunger locking block (411) to the limit stop bar (353);

one end of the locking spring (7) is abutted against the inner top wall of the shell, and the other end of the locking spring is abutted against the upper sliding seat (61).

2. The two-stage automatic injector with injection prompt sound according to claim 1, wherein the bottom of the locking slider (612) is provided with a slider inclined plane (6121), and the slider inclined plane (6121) is inclined towards the corresponding plunger locking block (411) along the height direction; the top of one side of the limiting barrier (353) far away from the locking clamping groove (352) is provided with a barrier inclined plane (3531).

3. The two-part automatic injector with an injection cue sound of claim 1 wherein the lock slide (612) has a cavity with an open upper end.

4. The two-part automatic injector with injection cue sound of claim 1 wherein the lower slide (62) comprises a sleeve portion (621) and a support arm (622) connected to the bottom of the sleeve portion (621) and against which the trigger (8) abuts; the sleeve portion (621) is provided with a first convex portion (6212) on the inner wall thereof, and the first convex portion (6212) is provided with a first impact surface (62121) which is matched with the impact ring surface (611) to realize impact sound emission.

5. The two-part automatic injector with injection prompting sound according to claim 4, characterized in that the sleeve part (621) is provided with a first empty groove (6213) at the outer wall corresponding to the first convex part (6212).

6. The two-part automatic injector with injection cue sound of claim 5 wherein the barrel portion (621) is further provided with a second protrusion (6214) on its inner wall which mates with the plunger locking block (411); the unlocking inclined plane (62141) is arranged on the second convex part (6214), and the second convex part (6214) is also provided with a second impact surface (62142) which is matched with the impact ring surface (611) to realize impact sound production; the sleeve portion (621) has a second hollow groove (6215) formed in an outer wall thereof corresponding to the second protrusion (6214).

7. The two-part automatic injector with injection cue sound of claim 6, wherein a slider guide groove is formed between the first boss (6212) and the second boss (6214); the mounting frame (3) is provided with a sliding seat guide part matched with the sliding seat guide groove.

8. The two-piece auto-injector with injection cue tone of claim 2 wherein the width of the locking gap (354) is greater than the width of the locking slide (612); the top of the plunger locking block (411) is provided with a first tangent plane (4111) matched with the slide block inclined plane (6121); the bottom of the plunger locking block (411) has a second cut surface (4112) which is matched with the unlocking inclined surface (62141).

9. The two-stage automatic injector with injection prompting sound is characterized in that the outer wall of the mounting rack (3) is further provided with a locking lug (358), the locking lug (358) is provided with a first locking plane, and the upper slide (61) is provided with an elastic locking hook (614); when the impact ring surface (611) impacts on the top of the lower sliding seat (62), the hook part of the elastic locking hook (614) is positioned above the locking lug (358); when the two-segment automatic injector is taken off from a human body, the locking lug (358) is locked with the elastic locking hook (614).

10. The two-stage automatic injector with injection prompt sound as claimed in claim 1, wherein the trigger (8) is provided with a protection convex ring (811) at the circumference of the inner wall of the bottom part thereof; the two-section type automatic injector is further provided with a protective pen cap (9), and the protective pen cap (9) is provided with a protective convex part (93) clamped at the top of the protective convex ring (811).