Auto-injector

Abstract

An auto-injector, comprising: a pen cap (1), a front pen holder (2), and a compression mechanism. The compression mechanism is arranged inside the pen cap (1) and the front pen holder (2). The compression mechanism comprises a rear pen holder (7). During use, a limiting block (16) on the surface of a push rod (11) can rotate accordingly, a track (15) can cancel the limiting to the limiting block (16), and a push rod spring (10) in the push rod (11) is normally in a compressed state. When the limiting to the limiting block (16) is canceled, the push rod spring (10) is compressed to push the push rod (11) to move, then the push rod (11) can push a rubber plug (12) to move, subsequently, the rubber plug (12) squeezes a drug liquid in a needle cylinder (13), and the drug liquid flows out from the inside of the needle and finally enters the body of a patient. By means of using the simplified parts, production costs are reduced, and the stability of the injector can be improved. Meanwhile, the requirements of customers for small size are better met.

Description

Auto-injectors Technical Field

[0001] The present invention belongs to the technical field of medical devices, in particular to an automatic injector. Background Art

[0002] Autoinjectors are a product of modern medical technology that can significantly change people's understanding of injection therapy. The original intention of this medical device is to simplify the injection process, reduce the difficulty of operation, reduce the pain of patients, and better control the dosage and injection speed of the drug.

[0003] Due to their automated nature, autoinjectors have become popular among healthcare professionals and patients. However, the manufacturing process is complex, requiring extremely high component precision and quality. This is because the precision of an autoinjector directly impacts its performance and effectiveness. Every component, regardless of size or shape, undergoes rigorous testing and inspection to ensure it meets design requirements and quality standards.

[0004] To meet these requirements, auto-injectors typically require the use of high-quality materials that are not only durable enough to maintain their shape and precision over repeated uses, but also accurate enough to ensure that the syringe delivers the correct dose. These factors put pressure on the manufacturing costs of auto-injectors and may increase the cost of raw materials.

[0005] Therefore, during the production process, in order to ensure the quality and performance of the product, precision components usually need to use high-quality materials to ensure their durability and accuracy, which may increase the cost of raw materials.

[0006] Summary of the Invention

[0007] The object of the present invention is to provide an automatic injector to solve the problems raised in the above background technology. In order to achieve the above object, the present invention provides the following technical solution: the automatic injector includes:

[0008] pen cap and front barrel;

[0009] A compression mechanism is provided inside the pen cap and the front pen barrel;

[0010] The compression mechanism includes a rear pen holder, which is fixedly connected to one end of the front pen holder. A rear cover is provided inside the rear pen holder. A brake sleeve is movably connected inside the rear cover. A brake spring is movably sleeved on the surface of the brake sleeve. A trigger sleeve located inside the front pen holder is fixedly installed on one end of the brake sleeve.

[0011] The limiting mechanism is arranged inside the brake sleeve, and the limiting mechanism includes a fixed sleeve, which is rotatably connected to the inside of the brake sleeve, a track is opened on the surface of the fixed sleeve, a syringe sleeve is fixedly installed on one end of the fixed sleeve, and an elastic arm is movably connected inside the track;

[0012] The trigger mechanism is arranged inside the fixed sleeve, and the trigger mechanism includes a push rod, which is movably connected to the inside of the fixed sleeve, the surface of the push rod is movably fixedly connected to a limit block located inside the track, and the inside of the push rod is movably connected to a push rod spring;

[0013] An injection assembly is disposed inside the syringe sleeve, and the injection assembly has a syringe;

[0014] Among them, the limit block will rotate under the push of the trigger sleeve, and the limit block will move from the left end of the elastic arm to the right end of the elastic arm. The rubber plug will squeeze the liquid medicine inside the syringe under the elastic force of the push rod spring.

[0015] Preferably, the syringe is fixedly connected to the interior of the syringe sleeve, and a rubber plug located inside the syringe is fixedly mounted on one end of the push rod.

[0016] Preferably, one end of the brake spring is fixedly connected to one end of the rear cover, and the other end of the brake spring is fixedly connected to the brake sleeve, and the brake spring can be compressed and deformed on the surface of the brake sleeve.

[0017] Preferably, the elastic arm is designed to be inclined.

[0018] Preferably, one end of the push rod spring is fixedly connected to one end inside the fixed sleeve, and the other end of the push rod spring is fixedly connected to one end of the push rod, and the push rod spring is normally in a compressed state.

[0019] Preferably, the fixed sleeve also includes a retaining clip. The trigger sleeve compresses the brake sleeve, which in turn compresses the brake spring and forces the stopper to move rightward. This is then forced forward by the push rod spring to complete the injection of the liquid medicine. The retaining clip, once it has cleared the step, stops the trigger sleeve from moving backward.

[0020] Preferably, the trigger sleeve is located inside the front pen barrel, and the trigger sleeve is movable inside the front pen barrel.

[0021] Preferably, a PFS needle cap is installed inside the pen cap, and a clamping block is provided inside the pen cap, and one end of the PFS needle cap contacts the clamping block.

[0022] Preferably, the diameter of the syringe sleeve is larger than the diameter of the syringe, and the syringe sleeve is located inside the trigger sleeve.

[0023] The beneficial effects of the present invention are as follows:

[0024] The present invention moves the trigger sleeve, and then the needle at one end of the syringe comes into contact with the patient's skin and then enters the patient's skin. Then, during the movement of the trigger sleeve, the brake sleeve is pushed to move. During the movement of the brake sleeve, the brake spring is compressed, and then the push rod rotates, and then the limit block on the surface of the push rod rotates accordingly, and then the track cancels the limit on the limit block.

[0025] The push rod spring inside the push rod is normally in a compressed state. When the limit of the limit block is released, the compressed push rod spring will push the push rod to move, and then the push rod will push the plug to move, and then the plug will squeeze the liquid medicine inside the syringe, and then the liquid medicine will flow out from the inside of the needle and finally enter the patient's body.

[0026] The present invention reduces production costs by using streamlined components, can improve the stability of the syringe, and can better meet the customer's requirements for small size. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] FIG1 is a diagram showing a syringe according to the present invention.

[0028] FIG2 is a cross-sectional view of a pen cap according to the present invention.

[0029] FIG3 is a cross-sectional view of the trigger sleeve of the present invention.

[0030] FIG4 is a cross-sectional view of the brake sleeve of the present invention.

[0031] FIG5 is a cross-sectional view of the syringe of the present invention.

[0032] FIG6 is a schematic diagram of the trigger sleeve of the present invention after being triggered.

[0033] In the figure: 1. Pen cap; 2. Front pen barrel; 3. Trigger sleeve; 4. Syringe sleeve; 5. Fixed sleeve; 6. Brake sleeve; 7. Rear pen barrel; 8. Rear cover; 9. Brake spring; 10. Push rod spring; 11. Push rod; 12. Rubber plug; 13. Syringe; 14. PFS needle cap; 15. Track; 16. Limit block; 17. Spring arm; 18. Block; 19. Retraction buckle. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. It is obvious that the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0035] As shown in Figures 1 to 6, an embodiment of the present invention provides an automatic injector, comprising:

[0036] The pen cap 1 and the front pen body 2 are provided with a PFS needle cap 14 fixedly installed inside the pen cap 1.

[0037] The compression mechanism is disposed within the pen cap 1 and the front pen barrel 2. The compression mechanism includes a rear pen barrel 7, which is fixedly connected to one end of the front pen barrel 2. A rear cover 8 is disposed within the rear pen barrel 7. A brake sleeve 6 is movably connected to the rear cover 8. A brake spring 9 is movably mounted on the surface of the brake sleeve 6. A trigger sleeve 3, located within the front pen barrel 2, is fixedly mounted on one end of the brake sleeve 6.

[0038] The limiting mechanism is arranged inside the brake sleeve 6. The limiting mechanism includes a fixed sleeve 5, which is rotatably connected to the inside of the brake sleeve 6. A track 15 is opened on the surface of the fixed sleeve 5, and a syringe sleeve 4 is fixedly installed at one end of the fixed sleeve 5.

[0039] The trigger mechanism is arranged inside the fixed sleeve 5. The trigger mechanism includes a push rod 11, which is movably connected to the inside of the fixed sleeve 5. The surface of the push rod 11 is movably fixedly connected to a limit block 16 located inside the track 15, and the push rod 11 is movably connected to the push rod spring 10 inside.

[0040] The injection assembly is disposed inside the syringe sleeve 4 and includes a syringe 13 .

[0041] Among them, the limit block 16 will rotate under the push of the trigger sleeve 3, and the limit block 16 will move from the left end of the elastic arm 17 to the right end of the elastic arm 17. The rubber plug 12 will squeeze the liquid medicine inside the syringe 13 under the elastic force of the push rod spring 10.

[0042] The operator pulls out the pen cap 1, and during the movement of the pen cap 1, the PFS needle cap 14 will be pulled out, and then the surface of the trigger sleeve 3 will contact the patient's skin, and then the trigger sleeve 3 will be pushed to move. During the movement of the trigger sleeve 3, the needle of the injection assembly will enter the patient's skin. During the movement of the trigger sleeve 3, the brake sleeve 6 will be pushed to move, and then the brake sleeve 6 will compress the brake spring 9, and the push rod 11 will rotate, the limit block 16 will move inside the track 15, and then the track 15 will cancel the limit on the limit block 16, and then the compressed push rod spring 10 will push the push rod 11 to move. When the push rod 11 moves, the medicine inside the injection assembly will be injected into the patient's body.

[0043] As shown in FIG5 , the syringe 13 is fixedly connected to the interior of the syringe sleeve 4 , and a rubber plug 12 located inside the syringe 13 is fixedly mounted on one end of the push rod 11 .

[0044] Through the design of the injection assembly, when the limit of the limit block 16 is cancelled, the push rod spring 10 will push the push rod 11 and the limit block 16 to move, and then the push rod 11 will push the plug 12 to move inside the syringe 13, and then the plug 12 will push the medicine to move, and then the medicine will enter the patient's body.

[0045] As shown in FIG3 , one end of the brake spring 9 is fixedly connected to one end of the rear cover 8 , and the other end of the brake spring 9 is fixedly connected to the brake sleeve 6 . The brake spring 9 can be compressed and deformed on the surface of the brake sleeve 6 .

[0046] Among them, through the design of the brake spring 9, when the brake spring 9 moves, because the rear cover 8 is fixed inside the rear pen barrel 7, the rear cover 8 will serve as a support point, and there is a groove on the surface of the brake sleeve 6, and then the other end of the brake spring 9 is fixedly connected in the groove, so that when the brake sleeve 6 moves, the brake spring 9 will be squeezed, so that the brake spring 9 will be smoothly compressed.

[0047] As shown in FIG5 , a guide groove is provided on the inner wall of the brake sleeve 6 , and a retaining buckle 19 is provided in the fixing sleeve 5 .

[0048] The brake sleeve 6 is squeezed and moved by the trigger sleeve 3, compressing the brake spring 9 and forcing the stopper 16 to move rightward. The stopper 16 is then forced forward by the push rod spring 10, completing the drug injection. The stopper 19, after crossing the step, stops the trigger sleeve 3 from moving backward, thus protecting the needle.

[0049] As shown in Figure 4, through the design of the elastic arm 17, because the elastic arm 17 is located inside the track 15, when the limit block 16 moves, it will contact the surface of the elastic arm 17, and then push the elastic arm 17 to move, and then the limit block 16 will pass through the surface of the elastic arm 17. When the limit block 16 is away from the surface of the elastic arm 17, the elastic arm 17 will recover, thereby preventing the limit block 16 from resetting.

[0050] As shown in FIG5 , one end of the push rod spring 10 is fixedly connected to one end inside the fixed sleeve 5 , and the other end of the push rod spring 10 is fixedly connected to one end inside the rear cover 8 . The push rod spring 10 is normally in a compressed state.

[0051] Among them, through the design of the push rod spring 10, when the push rod spring 10 is installed, the push rod spring 10 is normally in a compressed state. When the track 15 cancels the compression of the limit block 16, the compressed push rod spring 10 will push the push rod 11 to move inside the fixed sleeve 5, and then the push rod 11 will push the plug 12 to move, and then inject the medicine into the patient's skin.

[0052] As shown in FIG. 5 , the surface of the rubber plug 12 fits into the interior of the syringe 13 , and the rubber plug 12 can move inside the syringe 13 .

[0053] Among them, through the design of the plug 12, when the plug 12 moves, because the plug 12 fits the inner wall of the syringe 13 and the plug 12 can move inside the syringe 13, the plug 12 will squeeze the medicine inside the syringe 13 and enter the patient's body through the needle.

[0054] As shown in FIG. 4 , the trigger sleeve 3 is located in the front pen barrel 2 , and the trigger sleeve 3 can move inside the front pen barrel 2 .

[0055] Among them, through the design of the trigger sleeve 3, when the trigger sleeve 3 is not moved, the trigger sleeve 3 will wrap the needle at one end of the syringe 13, and when the trigger sleeve 3 is pushed to move, the needle will leak out and pierce into the patient's skin.

[0056] As shown in FIG3 , a clamping block 18 is provided inside the pen cap 1 , and one end of the PFS needle cap 14 contacts the clamping block 18 .

[0057] Among them, through the design of the PFS needle cap 14, when the pen cap 1 moves, the blocking block 18 will clamp the PFS needle cap 14, so that when the pen cap 1 moves, the PFS needle cap 14 will be pulled out.

[0058] As shown in FIG. 3 , the diameter of the syringe sleeve 4 is larger than that of the syringe 13 , and the syringe sleeve 4 is located inside the trigger sleeve 3 .

[0059] Among them, through the design of the syringe sleeve 4, the syringe sleeve 4 can support and fix the syringe 13, thereby preventing the interior of the syringe 13 from shifting when injecting the liquid medicine.

[0060] Working principle and usage process:

[0061] When the user uses the syringe, he first needs to pull out the pen cap 1, which will also pull out the PFS needle cap 14. Then the PFS needle cap 14 will be separated from one end of the syringe 13. Then, one end of the trigger sleeve 3 will come into contact with the patient's skin. Then, the trigger sleeve 3 is squeezed. While squeezing, the trigger sleeve 3 will move. Then, the needle at one end of the syringe 13 will come into contact with the patient's skin and then enter the patient's skin.

[0062] During the movement of the trigger sleeve 3, the brake sleeve 6 will be pushed to move. During the movement of the brake sleeve 6, the brake spring 9 will be compressed, and then the push rod 11 will rotate, and then the limit block 16 on the surface of the push rod 11 will rotate accordingly, and then the track 15 will cancel the limit on the limit block 16. The push rod spring 10 inside the push rod 11 is normally in a compressed state. When the limit on the limit block 16 is canceled, the compressed push rod spring 10 will push the push rod 11 to move.

[0063] Then, the push rod 11 pushes the rubber plug 12 to move, and the rubber plug 12 squeezes the liquid medicine inside the syringe 13, and the liquid medicine flows out from the needle and finally enters the patient's body. After the injection is completed, the syringe can be pulled out of the patient's skin. When the trigger sleeve 3 is not compressed, the compressed brake spring 9 pushes the brake sleeve 6 and the trigger sleeve 3, and then the trigger sleeve 3 wraps around the needle, thereby protecting the needle.

[0064] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0065] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An auto-injector, characterized in that, the auto-injector comprises: a pen cap (1) and a front pen barrel (2); a compression mechanism disposed inside the pen cap (1) and the front pen barrel (2), the compression mechanism includes a rear pen barrel (7), the rear pen barrel (7) is fixedly connected to one end of the front pen barrel (2), a rear cover (8) is disposed inside the rear pen barrel (7), a brake sleeve (6) is movably connected inside the rear cover (8), a brake spring (9) is movably sleeved on the surface of the brake sleeve (6), and a trigger sleeve (3) located inside the front pen barrel (2) is fixedly installed at one end of the brake sleeve (6); a limiting mechanism disposed inside the brake sleeve (6), the limiting mechanism includes a fixed sleeve (5), the fixed sleeve (5) is rotatably connected inside the brake sleeve (6), a track (15) is provided on the surface of the fixed sleeve (5), a syringe barrel sleeve (4) is fixedly installed at one end of the fixed sleeve (5), and a spring arm (17) is movably connected inside the track (15); a triggering mechanism disposed inside the fixed sleeve (5), the triggering mechanism includes a push rod (11), the push rod (11) is movably connected inside the fixed sleeve (5), a limiting block (16) located inside the track (15) is movably and fixedly connected to the surface of the push rod (11), and a push rod spring (10) is movably connected inside the push rod (11); and an injection assembly disposed inside the syringe barrel sleeve (4), and the injection assembly has a syringe barrel (13); wherein, the limiting block (16) rotates under the push of the trigger sleeve (3), the limiting block (16) moves from the left end of the spring arm (17) to the right end of the spring arm (17), and the rubber plug (12) squeezes the liquid medicine inside the syringe barrel (13) under the elastic force of the push rod spring (10).

2. The auto-injector according to claim 1, characterized in that, the syringe barrel (13) is fixedly connected inside the syringe barrel sleeve (4), and a rubber plug (12) located inside the syringe barrel (13) is fixedly installed at one end of the push rod (11).

3. The auto-injector according to claim 1, characterized in that, one end of the brake spring (9) is fixedly connected to one end of the rear cover (8), the other end of the brake spring (9) is fixedly connected to the brake sleeve (6), and the brake spring (9) can be compressed and deformed on the surface of the brake sleeve (6).

4. The auto-injector according to claim 1, characterized in that, the spring arm (17) is inclined.

5. The auto-injector according to claim 1, characterized in that, one end of the push rod spring (10) is fixedly connected to one end inside the fixed sleeve (5), the other end of the push rod spring (10) is fixedly connected to one end of the push rod (11), and the push rod spring (10) is normally in a compressed state.

6. The auto-injector according to claim 1, characterized in that, The fixed sleeve (5) also includes a stop buckle (19). The brake sleeve (6) is squeezed and moved by the trigger sleeve (3). While compressing the brake spring (9), the limit block (16) is forced to move to the right. Then, the limit block (16) is squeezed and moved forward by the push rod spring (10) to complete the injection of the liquid medicine. After the stop buckle (19) passes over the step, it achieves the stop function. At this time, the trigger sleeve (3) cannot move backward.

7. The automatic injector according to claim 1, It is characterized in that The trigger sleeve (3) is located inside the front pen shaft (2), and the trigger sleeve (3) is capable of moving inside the front pen shaft (2).

8. The automatic injector according to claim 1, It is characterized in that A PFS needle cap (14) is installed inside the pen cap (1), and a clamping block (18) is arranged inside the pen cap (1), and one end of the PFS needle cap (14) is in contact with the clamping block (18).

9. The automatic injector according to claim 1, It is characterized in that The diameter of the syringe sleeve (4) is larger than the diameter of the syringe (13), and the syringe sleeve (4) is located inside the trigger sleeve (3).

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