Needle concealment device for an automatic injector and automatic injector thereof

Abstract

The embodiment of the utility model provides a kind of needle-concealing device for automatic injector and its automatic injector, belong to the technical field of medical devices.The needle-concealing device includes: trigger part, it is hollow cylinder and is set on the needle head outside of automatic injector, and its front end is provided with pressing piece and rear end is provided with pusher;Stop ring, its front end is connected with pusher and rear end is provided with first buckle;Medicine bin, it is the cylindrical shell for accommodating medicine bag and is provided in the rear end of stop ring, and its front end is provided with second buckle;Second buckle and first buckle abut before injection and are located in the rear end of first buckle;Press pressing piece when injection, pusher pushes stop ring to move to rear end, and first buckle props open medicine bin and releases medicine bag to carry out automatic injection;After injection, trigger part resets, and second buckle is located in the front end of first buckle and is locked with stop ring together to lock trigger part.The needle-concealing device of the utility model can lock trigger part after injection and cannot retreat to protect needle head, and secondary use can be avoided.

Description

Technical Field

[0001] This utility model belongs to the technical field of medical devices, and specifically relates to a hidden needle device for an autoinjector and the autoinjector thereof. Background Technology

[0002] Subcutaneous injection of medications via syringe is a common method of drug administration. For example, insulin injectors used by diabetic patients deliver a capsule containing a measured amount of artificial insulin subcutaneously through an internal delivery mechanism to regulate blood sugar.

[0003] Because the delivery mechanism is hidden inside the syringe, it needs to be pushed from the outside by a triggering mechanism on the outside of the syringe to push the drug capsule. The triggering mechanism needs to ensure that it can smoothly trigger the internal delivery mechanism to complete the delivery and injection of the drug capsule during injection, and also needs to protect and shield the needle after injection to prevent accidental needle exposure and secondary triggering.

[0004] Existing pre-filled syringes have the following drawbacks: after injection, the needle at the injection end is shielded by an external protective sleeve, but the trigger mechanism inside the syringe is not locked. If the external protective sleeve falls off, the exposed needle could cause accidental injury. Furthermore, the lack of a locking mechanism can lead to secondary triggering, which is detrimental to the syringe's single-use and recycling capabilities and poses a safety hazard.

[0005] In view of this, there is a need for a new type of hidden needle device for autoinjectors and an autoinjector thereof to solve all or part of the above problems. Utility Model Content

[0006] To address at least one of the aforementioned problems and deficiencies in the prior art, embodiments of this utility model provide a concealed needle device for an auto-injector and the same device. By setting a stop ring at the rear end of the concealed needle device and engaging it with the cartridge via a snap-fit ​​mechanism, the device ensures that the cartridge is opened during injection to complete the automatic injection, and that the device will not retract upon resetting after injection and being pressed again. This effectively protects the needle, preventing accidental needle injury and secondary triggering of the auto-injector. The technical solution is as follows:

[0007] According to one aspect of the present invention, a concealed needle device for an autoinjector is provided. The concealed needle device includes:

[0008] The triggering part is a hollow cylinder that is sleeved on the outside of the needle of the auto-injector. A pressing part is provided at the front end of the hollow cylinder and a pushing part is provided at the rear end.

[0009] The stop ring has its front end connected to the pusher of the trigger part, and its rear end is provided with a first buckle.

[0010] The medicine container is a cylindrical shell located at the rear end of the stop ring. The medicine capsule is housed inside the cylindrical shell, and a second buckle is provided at the front end of the medicine container.

[0011] Before injection, the second latch of the drug cartridge abuts against the first latch of the stop ring and is located at the rear end of the first latch. During injection, pressing the trigger mechanism pushes the stop ring towards the rear end of the auto-injector, away from the needle. The first latch opens the drug cartridge to release the drug capsule for automatic injection. After injection, the trigger mechanism resets, and the second latch is located at the front end of the first latch and engages with the stop ring to lock the trigger mechanism.

[0012] In some embodiments, the trigger portion of the concealed needle device further includes a trigger spring, which is sleeved on the outside of the trigger portion. During injection, pressing the pressing member of the trigger portion compresses the trigger spring to store force, and after injection, the trigger spring releases the stored force to push the trigger portion back to its original position.

[0013] In some embodiments, specifically, the pressing member is an annular boss provided at the front end of the triggering part, the front end of the pushing member is provided with a limiting boss, one end of the triggering spring abuts against the annular boss, and the other end abuts against the limiting boss.

[0014] In some embodiments, preferably, the hidden needle device further includes a support ring, which is sleeved on the outside of the trigger portion, and the rear end of the support ring abuts against the limiting boss.

[0015] In some embodiments, specifically, the stop ring includes a ring body and at least two ribs fixedly connected to the rear end of the ring body. One end of each of the at least two ribs is fixedly connected to the ring body, and the other end extends along the axial direction of the ring body. A first snap is provided on the end of each rib away from the ring body.

[0016] In some embodiments, specifically, during injection, as the stop ring moves rearward, the first latch opens the front end of the drug cartridge, and the second latch of the drug cartridge inserts between two adjacent ribs on the stop ring and engages with the ring body of the stop ring.

[0017] In some embodiments, preferably, the first buckle is a wedge-shaped structure having a first inclined surface, the end of the first inclined surface near the ring being higher than the end away from the ring.

[0018] In some embodiments, preferably, the second buckle is a protruding structure, which is disposed at the front end of the drug cartridge and protrudes into the interior of the drug cartridge to form a groove with the wall of the drug cartridge. After injection, the second buckle is engaged with the ring body of the stop ring through the groove.

[0019] According to another aspect of the present invention, an autoinjector is provided, comprising a needle, a concealed needle device, a drug capsule, and a delivery device sequentially connected inside a housing. The concealed needle device is the type described in the foregoing aspects.

[0020] In some embodiments, the medicine container is fixedly disposed together with the outer shell, and the pushing device is disposed at the rear end of the medicine container and the front end of the pushing device abuts against the medicine sac inside the medicine container.

[0021] During injection, pressing the pressing part at the front end of the trigger of the hidden needle device causes the pusher at its rear end to push the stop ring to move away from the rear end of the automatic injector. The first buckle of the stop ring opens the drug chamber, releasing the compressed force of the pusher to push the drug capsule for automatic injection.

[0022] After injection, the trigger part of the hidden needle device is pushed towards the needle tip by its trigger spring to reset, wherein the second latch of the drug cartridge engages with the stop ring of the hidden needle device to lock the trigger part of the hidden needle device so that it cannot retract.

[0023] The concealed needle device for an autoinjector and the autoinjector thereof provided by the embodiments of this utility model have at least one or a portion of the following advantages:

[0024] (1) By setting a stop ring at the rear end of the hidden needle device and engaging it with the drug cartridge via a snap-fit, the hidden needle device opens the drug cartridge during injection to complete automatic injection and ensures that the hidden needle device will not retract after being reset and pressed again, thereby protecting the needle and preventing accidental needle injury and secondary triggering of the automatic injector.

[0025] (2) The push before injection and the locking after injection are completed by the relative position change of the first buckle of the stop ring and the second buckle of the drug compartment before and after injection. The assembly structure and processing technology are simple and the assembly stability is high.

[0026] (3) The trigger part at the front end is fixed and locked by the stop ring and the medicine tank, so that the trigger part cannot move backward when the press is pressed again, thus avoiding the reuse of the automatic injector;

[0027] (4) By setting multiple ribs with first buckles at intervals on the stop ring, it is ensured that the pressing part of the trigger part can push the stop ring to move backward and smoothly open the drug chamber so that the rear push device can smoothly push the drug capsule to complete the injection.

[0028] (5) By installing a trigger spring between the pressing part and the pushing part of the trigger part, it is ensured that after the pressing part triggers the pushing device to push the drug capsule for automatic injection, the trigger part can be smoothly and quickly retracted and reset when the pressing part is released.

[0029] (6) By fitting a support ring at the rear end of the trigger part, the trigger part can be effectively positioned to prevent axial displacement of the internal components of the auto-injector before, during and after injection, thereby improving the assembly stability of the auto-injector. Attached Figure Description

[0030] These and / or other aspects and advantages of this utility model will become apparent and readily understood from the following description of preferred embodiments taken in conjunction with the accompanying drawings, in which:

[0031] Figure 1 This is a cross-sectional structural schematic diagram of an automatic injector according to an embodiment of the present invention;

[0032] Figure 2 for Figure 1 The diagram shows an enlarged structural schematic of the hidden needle device of one embodiment of the autoinjector before injection.

[0033] Figure 3 for Figure 2 The diagram shows an enlarged structural schematic of the hidden needle device used in the autoinjector after injection.

[0034] Figure 4 for Figure 2 A schematic diagram of the trigger section of one embodiment of the hidden needle device shown;

[0035] Figure 5 for Figure 2 A schematic diagram of the stop ring structure of one embodiment of the concealed needle device shown;

[0036] Figure 6 for Figure 2 A schematic diagram of the drug reservoir of one embodiment of the hidden needle device shown. Detailed Implementation

[0037] The technical concept and technical solution of this utility model will be further described in detail below through embodiments and in conjunction with the accompanying drawings. In this specification, the same or similar reference numerals indicate the same or similar components. The following description of the embodiments of this utility model with reference to the accompanying drawings is intended to explain the overall concept of this utility model and should not be construed as a limitation thereof.

[0038] It should also be understood that although the terms "first," "second," "third," etc., may be used in the following embodiments of this utility model to describe a component comprising two or more of the same component, these components should not be limited to these terms, which are only used to distinguish each component from one another. Furthermore, descriptions indicating orientation such as "upper," "lower," "left," "right," "front," and "rear" are merely illustrative of the relative positions of components and should not be construed as a limitation of this utility model.

[0039] To address the problems of existing pre-filled syringes, such as accidental triggering before injection, inability to inject all medication during injection, lack of internal braking mechanism after injection, and inability to protect the needle externally, embodiments of this utility model provide a concealed needle device for an auto-injector and the auto-injector thereof. By setting a stop ring at the rear end of the concealed needle device and engaging it with the medication cartridge via a snap-fit, the device ensures that the medication cartridge is opened during injection to complete automatic injection, and that the device will not retract after being reset and pressed again. This effectively protects the needle, preventing accidental needle injury and secondary triggering of the auto-injector.

[0040] According to one aspect of the present invention, a hidden needle device 100 for an autoinjector is provided.

[0041] See Figure 1 The diagram shows a cross-sectional structure of a concealed needle device 100 according to one embodiment, wherein the concealed needle device 100 is disposed at the injection end of an autoinjector 200 according to one embodiment. For example... Figure 1 The left side shown, where the needle 201 is located, is the front end of the autoinjector 200. Conversely, Figure 1 The right side shows the rear end of the autoinjector 200.

[0042] See Figure 2 This shows, as Figure 1 The diagram shows an enlarged view of the hidden needle device 100 in its unused state before injection by the autoinjector 200.

[0043] Combination Figure 1 and Figure 2 As shown, the concealed needle device 100 includes three main parts: a trigger unit 10, a stop ring 20, and a drug cartridge 30, which are sequentially linked together from the front end to the rear end of the autoinjector 200. Specifically, the trigger unit 10 is a hollow cylinder fitted around the outside of the needle 201 of the autoinjector 200. A pressing member 11 is provided at the front end of the hollow cylinder, and a pushing member 12 is provided at the rear end. The front end of the stop ring 20 is connected to the pushing member 12 of the trigger unit 10, and a first latch 21 is provided at its rear end. The drug cartridge 30 is a cylindrical shell located at the rear end of the stop ring 20. The drug capsule 202 is housed inside the cylindrical shell, and a second latch 32 is provided at the front end of the drug cartridge 30.

[0044] Exemplarily, the sac 202 may be a capsule pre-filled with a drug, and the capsule may be a shell structure made of a soluble material to contain the drug. The sac 202 may also be a liquid drug or a solid drug (tablet, granule, etc.) directly pre-filled into the sac 30. This is merely an illustrative example and should not be construed as a limitation of the present invention by those skilled in the art.

[0045] See Figure 3 This shows, as Figure 1 An enlarged view of the structure of the hidden needle device 100 after injection by the autoinjector 200.

[0046] Combination Figures 1-3 As shown, before injection, the second latch 32 of the drug chamber 30 abuts against the first latch 21 of the stop ring 20 and is located at the rear end of the first latch 21. During injection, pressing the pressing member 11 of the trigger part 10 causes its pushing member 12 to push the stop ring 20 towards the rear end of the auto-injector 200 away from the needle 201, and the first latch 21 opens the drug chamber 30 to release the drug capsule 202 for automatic injection. After injection, the trigger part 10 resets, and the second latch 32 is located at the front end of the first latch 21 and engages with the stop ring 20 to lock the trigger part 10.

[0047] In one example, the trigger portion 10 of the hidden needle device 100 further includes a trigger spring 13, which is sleeved on the outside of the trigger portion 10. During injection, pressing the pressing member 11 of the trigger portion 10 compresses the trigger spring 13 to store force, and after injection, the trigger spring 13 releases the stored force to push the trigger portion 10 to reset.

[0048] See Figure 4 , showing the use of Figure 1 The overall structure of the trigger section 10 in one embodiment of the hidden needle device 100.

[0049] In one example, specifically, the pressing member 11 is an annular boss located at the front end of the trigger portion 10, and the front end of the pushing member 12 is provided with a limiting boss 121. Combined with... Figure 1 and Figure 4 As shown, the trigger spring 13 is sleeved on the outside of the trigger part 10 and located between the pressing member 11 and the pushing member 12. One end of the trigger spring 13 abuts against the annular boss (the rear end of the pressing member 11), and the other end abuts against the limiting boss 121.

[0050] In one example, preferably, the pressing member 11 is a double-layered annular boss, that is, as shown in the example. Figure 4The device shown has two circular ring structures along the axial direction, and a reinforcing rib connects the two ring structures. This arrangement reinforces the pressing member 11 and also makes it more convenient to use the automatic injector 200. This is only an illustrative example and should not be construed as a limitation of the present invention by those skilled in the art.

[0051] In one example, preferably, combined Figure 1 and Figure 4 As shown, the concealed needle device 100 also includes a support ring 40, which is sleeved on the outside of the trigger portion 10, with its rear end abutting against the limiting boss 121 of the trigger portion 10. The support ring 40 provides positioning and support for the concealed needle device 100 during assembly of the autoinjector 200. The positioning and assembly of the support ring 40 with the limiting structure on the housing 204 of the autoinjector 200 limits the extreme position of the trigger portion 10 towards the rear end of the autoinjector 200. When the trigger portion 10 is pressed to this extreme position, the released capsule 202 can be fully pushed for injection by the rearmost pushing device 203.

[0052] See Figure 5 , showing the use of Figure 1 The overall structure of the stop ring 20 in one embodiment of the hidden needle device 100. See also Figure 6 , showing the use of Figure 1 The overall structure of the medicine container 30 in one embodiment of the hidden needle device 100.

[0053] In one example, specifically, such as Figure 5 As shown, the stop ring 20 includes a ring body 23 and at least two reinforcing ribs 22 fixedly connected to the rear end of the ring body 23. One end of each of the at least two reinforcing ribs 22 is fixedly connected to the ring body 23, and the other end extends along the axial direction of the ring body 23. A first latch 21 is provided on the end of each of the at least two reinforcing ribs 22 away from the ring body 23.

[0054] In one example, alternatively, four ribs 22 may be arranged symmetrically and at equal intervals around the circumference of the ring 23. In a specific autoinjector 200, other numbers of ribs 22 may be used depending on structural or injection requirements, and the size of each rib 22 and the spacing between adjacent ribs 22 may also be specifically designed according to actual conditions. These are merely illustrative examples and should not be construed as limiting the scope of this invention.

[0055] Combination Figure 3 , Figure 5 and Figure 6As shown, in one example, specifically, during injection, as the stop ring 20 moves to the rear end, the first latch 21 opens the front end of the drug cartridge 30, and the second latch 32 of the drug cartridge 30 inserts between two adjacent ribs 22 on the stop ring 20 and engages with the ring body 23 of the stop ring 20.

[0056] In one example, preferably, such as Figure 2 As shown, the first latch 21 of the stop ring 20 is a wedge-shaped structure with a first inclined surface 211. The end of the first inclined surface 211 near the ring body 23 is higher than the end away from the ring body 23. During injection, pressing the trigger part 10 pushes the stop ring 20, and the first latch 21 can smoothly open the drug chamber 30 at its rear end to smoothly initiate and complete the injection of the drug capsule.

[0057] In one example, preferably, such as Figure 2 As shown, the second latch 32 at the front end of the drug reservoir 30 is a protruding structure. This protruding structure is located at the front end of the drug reservoir 30 and protrudes into the inside of the drug reservoir 30 to form a groove 321 with the wall surface of the drug reservoir 30. After injection, the second latch 32 is engaged with the ring body 23 of the stop ring 20 through the groove 321.

[0058] Combination Figure 2 and Figure 3 As shown, the hidden needle device 100 of the automatic injector 200 initiates injection by pressing the pressing member 11 of the trigger unit 10. The trigger unit 10 drives the stop ring 20 to move axially to the rear end. The stop ring 20 ensures that the first latch 21 smoothly passes through the second latch 32 of the drug cartridge 30 through the first inclined surface 211 of its first latch 21. After injection, the trigger unit 10 returns to the initial position via the trigger spring 13 (i.e., Figure 2 The position of the trigger part 10), but at this time the stop ring 20 is stuck by the medicine tank 30 and cannot be reset (i.e. Figure 3 The first latch 21 is located at the rear end of the second latch 32, and the second latch 32 is engaged with the stop ring 20. The first latch 21 of the stop ring 20 and the second latch 32 of the medicine tank 30 support each other. At this time, even if the pressing member 11 at the front end of the trigger part 10 is pressed, the trigger part 10 can no longer move to the rear end of the autoinjector 200, so that the needle 201 part of the autoinjector 200 can be completely covered and protected by the trigger part 10 after the injection is completed.

[0059] According to another aspect of the present invention, an autoinjector 200 is provided, which includes a needle 201, a concealed needle device 100, a drug capsule 202, and a delivery device 203 sequentially connected inside a housing 204. The concealed needle device 100 is the same as the concealed needle device 100 described in the embodiments of the above aspects. The specific structure of the concealed needle device 100 can be found in the descriptions of the above embodiments, and will not be repeated here.

[0060] In one example, specifically, the drug reservoir 30 of the hidden needle device 100 is fixedly disposed together with the housing 204 of the autoinjector 200, and the pusher 203 is disposed at the rear end of the drug reservoir 30 and the front end of the pusher 203 abuts against the drug capsule 202 inside the drug reservoir 30.

[0061] During injection, pressing the pressing member 11 at the front end of the trigger part 10 of the hidden needle device 100 causes the pusher 12 at its rear end to push the stop ring 20 to move away from the rear end of the auto-injector 200 away from the needle 201. The first buckle 21 of the stop ring 20 opens the drug chamber 30, so that the compression and storage of the pusher 203 is released to push the drug capsule 202 to perform automatic injection.

[0062] After injection, the trigger part 10 of the hidden needle device 100 is pushed by its trigger spring 13 to move and reset in the direction of the needle 201, wherein the second latch 32 of the drug cartridge 30 engages with the stop ring 20 of the hidden needle device 100 to lock the trigger part 10 of the hidden needle device 100 so that it cannot retract.

[0063] The concealed needle device for an autoinjector and the autoinjector thereof provided by the embodiments of this utility model have at least one or a portion of the following advantages:

[0064] (1) By setting a stop ring at the rear end of the hidden needle device and engaging it with the drug cartridge via a snap-fit, the hidden needle device opens the drug cartridge during injection to complete automatic injection and ensures that the hidden needle device will not retract after being reset and pressed again, thereby protecting the needle and preventing accidental needle injury and secondary triggering of the automatic injector.

[0065] (2) The push before injection and the locking after injection are completed by the relative position change of the first buckle of the stop ring and the second buckle of the drug compartment before and after injection. The assembly structure and processing technology are simple and the assembly stability is high.

[0066] (3) The trigger part at the front end is fixed and locked by the stop ring and the medicine tank, so that the trigger part cannot move backward when the press is pressed again, thus avoiding the reuse of the automatic injector;

[0067] (4) By setting multiple ribs with first buckles at intervals on the stop ring, it is ensured that the pressing part of the trigger part can push the stop ring to move backward and smoothly open the drug chamber so that the rear push device can smoothly push the drug capsule to complete the injection.

[0068] (5) By installing a trigger spring between the pressing part and the pushing part of the trigger part, it is ensured that after the pressing part triggers the pushing device to push the drug capsule for automatic injection, the trigger part can be smoothly and quickly retracted and reset when the pressing part is released.

[0069] (6) By fitting a support ring at the rear end of the trigger part, the trigger part can be effectively positioned to prevent axial displacement of the internal components of the auto-injector before, during and after injection, thereby improving the assembly stability of the auto-injector.

[0070] While some embodiments of the general concept of this utility model have been shown and described, those skilled in the art will understand that changes may be made to these embodiments without departing from the principles and spirit of the general concept of this utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A hidden needle device for an automatic injector, characterized in that, The hidden needle device includes: The triggering part is a hollow cylinder that is sleeved on the outside of the needle of the auto-injector. A pressing element is provided at the front end of the hollow cylinder, and a pushing element is provided at the rear end of the hollow cylinder. A stop ring, the front end of which is connected to the pusher, and a first buckle is provided at the rear end of the stop ring; The medicine container is a cylindrical shell and is located at the rear end of the stop ring. The medicine bag is housed inside the cylindrical shell, and a second buckle is provided at the front end of the medicine container. Before injection, the second buckle abuts against the first buckle and is located at the rear end of the first buckle; During injection, pressing the pressing member pushes the stop ring to move away from the rear end of the auto-injector, and the first buckle opens the drug chamber to release the drug capsule; After injection, the trigger part is reset, and the second buckle is located at the front end of the first buckle and engages with the stop ring to lock the trigger part.

2. The hidden needle device according to claim 1, characterized in that, The triggering part further includes a triggering spring, which is sleeved on the outside of the triggering part; During injection, pressing the pressing element of the trigger part compresses the trigger spring to store energy. After injection, the trigger spring releases the stored energy and pushes the trigger part to reset.

3. The hidden needle device according to claim 2, characterized in that, The pressing member is a circular boss located at the front end of the trigger part, and the front end of the pushing member is provided with a limiting boss. One end of the trigger spring abuts against the circular boss, and the other end of the trigger spring abuts against the limiting boss.

4. The hidden needle device according to claim 3, characterized in that, The hidden needle device also includes a support ring, which is sleeved on the outside of the trigger part, and the rear end of the support ring abuts against the limiting boss.

5. The hidden needle device according to claim 2, characterized in that, The stop ring includes a ring body and at least two reinforcing ribs fixedly connected to the rear end of the ring body. Each of the at least two ribs has one end fixedly connected to the ring body, and the other end extends along the axial direction of the ring body. The first buckle is located at the end of each rib that is away from the ring body.

6. The hidden needle device according to claim 5, characterized in that, During injection, as the stop ring moves to the rear end, the first buckle opens the front end of the drug cartridge, and the second buckle of the drug cartridge inserts between two adjacent ribs on the stop ring and engages with the ring body of the stop ring.

7. The hidden needle device according to any one of claims 1-6, characterized in that, The first buckle is a wedge-shaped structure with a first inclined surface, the end of the first inclined surface closer to the ring being higher than the end away from the ring.

8. The hidden needle device according to claim 7, characterized in that, The second buckle is a protruding structure, which is located at the front end of the medicine compartment and protrudes into the interior of the medicine compartment to form a groove with the wall of the medicine compartment; After injection, the second buckle is engaged with the ring body of the stop ring through the groove.

9. An automatic injector, the automatic injector comprising a needle, a concealed needle device, a drug capsule, and a delivery device sequentially connected in series inside a housing, characterized in that, The hidden needle device is the hidden needle device according to any one of claims 1-8.

10. The automatic injector according to claim 9, characterized in that, The medicine container is fixedly installed together with the outer shell. The pushing device is located at the rear end of the medicine compartment, and the front end of the pushing device abuts against the medicine sac inside the medicine compartment. During injection, pressing the pressing member at the front end of the trigger part of the hidden needle device causes the pushing member at its rear end to push the stop ring to move away from the rear end of the auto-injector. When the compression and storage of the pushing device is released to push the drug capsule for automatic injection, the first buckle of the stop ring opens the drug chamber. After injection, the trigger part of the hidden needle device is pushed back to its original position towards the needle tip by its trigger spring. The second latch of the medicine compartment engages with the stop ring to lock the trigger part.

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