Injection device with automatic excitation safety mechanism

Abstract

The utility model discloses an injection device with an automatic excitation safety mechanism, and particularly relates to the technical field of medicine injection, the injection device comprises a main body shell, a mounting bracket is elastically pressed in an inner cavity of the main body shell from a T-shaped end, an injector fixedly clamped with the mounting bracket penetrates through the mounting bracket, and a piston push rod of the injector is fixedly connected with a push rod bracket; the end, away from the main body shell, of the push rod support adaptively presses and excites the first elastic clamping jaw to deform in the direction away from the extension plate, a plurality of first guide plates and second guide plates extend from the inner cavity wall of the main body shell, and each second guide plate is provided with a clamping strip parallel to the main body shell. A plurality of elastic extending pieces parallel to the axis of the elastic extending pieces are arranged at the end, away from the push rod support, of the mounting support, and each elastic extending piece extends to form two elastic clamping jaws jointly matched with the adjacent clamping strips. And a user and a patient are protected from being punctured by the needle.

Description

Technical Field

[0001] This utility model belongs to the field of drug injection technology, specifically relating to an injection device with an automatic activation safety mechanism. Background Technology

[0002] Pre-filled or pre-filled syringes are commonly used for drug injection. They typically consist of a hollow barrel and plunger, as well as a needle. During injection procedures, patients and users are susceptible to needlestick injuries, especially at the moment the injection is completed and when the syringe is discarded.

[0003] Some existing syringes are equipped with post-injection safety devices to prevent needle pricks. For example, a syringe protection device and safety syringe with publication number CN117281978A, when the syringe plunger is pressed to the bottom, pressure is applied to a limiting element, causing the syringe barrel to release from the limiting element under the thrust of an elastic element. The needle then enters the protective sleeve through a through-hole, thus solving the problem of secondary injury to the user after injection. However, some drugs have high viscosity and require greater thrust for injection. If a regular syringe or the aforementioned safety syringe is used, its small flange size and small plunger pressing surface make it difficult for the plunger to tilt during injection due to lack of guidance and support, making it unsuitable for users who cannot tolerate high-force injections.

[0004] Therefore, a new type of injection device with an automatic activation safety mechanism is needed. Utility Model Content

[0005] To address the aforementioned problems, this utility model discloses an injection device with an automatic activation safety mechanism.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] An injection device with an automatic activation safety mechanism includes a main body shell. An installation bracket is elastically press-fitted into the inner cavity of the main body shell from its T-shaped end. A first elastic claw of the main body shell engages an extension plate of the installation bracket. A syringe is fixedly engaged with the installation bracket. A piston rod of the syringe is fixedly connected to a push rod bracket. The end of the push rod bracket away from the main body shell is adapted to press and activate the first elastic claw, causing it to deform in a direction away from the extension plate. Several first and second guide plates extend from the inner wall of the main body shell, and each second guide plate has a locking strip parallel to the main body shell. The outer wall of the installation bracket has a sliding groove adapted to the first guide plates. Several elastic extension pieces parallel to the axis of the installation bracket are provided at the end of the installation bracket away from the push rod bracket, and each elastic extension piece extends two elastic claws that commonly engage with adjacent locking strips. A needle sleeve outer shell is engaged at the cylindrical end of the main body shell.

[0008] As a preferred embodiment of this utility model, the notches of the first guide plate and the second guide plate are jointly fitted with a spring, and the other end of the spring abuts against the end of the mounting bracket where the first elastic claw is located.

[0009] In a preferred embodiment of this invention, the syringe barrel is held in place by a claw extending from the elastic plate of the mounting bracket.

[0010] As a preferred embodiment of the present invention, the syringe further includes an injection piston that is slidably installed inside the syringe barrel, and the injection piston is fixedly connected to the piston push rod.

[0011] As a preferred embodiment of this utility model, the needle tip of the syringe is fitted with a needle sleeve, and the needle sleeve is always held in place by at least two third elastic claws on the needle sleeve shell.

[0012] As a preferred technical solution of this utility model, the needle sleeve outer shell is provided with at least two second elastic claws that lock the cylindrical end of the main body shell, the inner wall of the needle sleeve outer shell extends with at least one guide rail, and the cylindrical end of the main body shell is provided with a notch adapted to the insertion of the guide rail.

[0013] As a preferred embodiment of this utility model, the several support rails of the push rod bracket are adapted to the gap between the first guide plate and the second guide plate, and the support rails of the push rod bracket are always linearly slidably inserted between the first guide plate and the second guide plate.

[0014] As a preferred technical solution of this utility model, the main body shell is provided with a first elastic claw on each of its two sides, and each first elastic claw corresponds to an extension plate.

[0015] As a preferred embodiment of this utility model, the inner wall of the main shell extends with two first guide plates and two second guide plates, and the first guide plates and the second guide plates are staggered.

[0016] As a preferred embodiment of the present invention, the two elastic extension pieces of the mounting bracket are distributed on both sides of itself, and the free ends of the elastic extension pieces are folded outward to extend elastic claws. The two elastic claws extending from the same elastic extension piece are mirror images of each other, and the ends of the two mirror images of the elastic claws together form a V-shaped opening for inserting the adapter clip.

[0017] The beneficial effects of this utility model are as follows:

[0018] 1. The injection device has a simple and reliable structure. After injection, the safety device is automatically activated, causing the needle of the syringe to retract into the main body shell, protecting the user and patient from additional needle pricks and improving the safety of use. The push rod bracket adopts a double guide rail design to ensure smooth sliding when the safety device is activated.

[0019] Second, this injection device adopts a main shell and push rod support, which simultaneously increases the flange size and push rod pressing surface. During the push rod push process, the push rod is guided and supported, which allows the user to easily press and inject drugs with high viscosity, adapt to high thrust injection, and improve the practicality of the injection device. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure in the initial state of an embodiment of this utility model;

[0021] Figure 2 This is an exploded view of the initial state of an embodiment of the present invention;

[0022] Figure 3 This is a cross-sectional view of the initial state of an embodiment of the present invention;

[0023] Figure 4 This is a cross-sectional view from another perspective of the initial state of an embodiment of the present utility model;

[0024] Figure 5 This is an embodiment of the present utility model. Figure 4 Enlarged view of point A in the middle;

[0025] Figure 6 This is a cross-sectional view of the locked state in an embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of the main shell structure of an embodiment of the present utility model;

[0027] Figure 8 This is a structural schematic diagram of the main shell of an embodiment of the present utility model from another perspective;

[0028] Figure 9 This is a schematic diagram of the structure of the mounting bracket, spring, and syringe in an embodiment of the present invention;

[0029] Figure 10 This is a schematic diagram of the structure of the mounting bracket in an embodiment of the present utility model;

[0030] Figure 11 This is a cross-sectional view of the needle sleeve shell according to an embodiment of the present invention.

[0031] List of identifiers in attached diagrams:

[0032] 1. Main body shell; 101. First elastic claw; 102. First guide plate; 103. Second guide plate; 104. Connecting strip; 105. Elastic arc plate;

[0033] 2. Mounting bracket; 201. Extension plate; 202. Elastic clamping plate; 203. Elastic extension piece; 204. Elastic gripper;

[0034] 3. Spring;

[0035] 4. Syringe; 401. Needle barrel; 402. Injection piston; 403. Piston rod; 404. Needle sheath;

[0036] 5. Push rod bracket;

[0037] 6. Needle sleeve housing; 601. Second elastic jaw; 602. Third elastic jaw; 603. Guide rail. Detailed Implementation

[0038] The present invention will be further explained below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention.

[0039] Please see Figure 1-11 An injection device with an automatically activated safety mechanism includes a main body shell 1. An installation bracket 2 is elastically press-fitted into the inner cavity of the main body shell 1 from its T-shaped end. A first elastic claw 101 of the main body shell 1 engages with an extension plate 201 of the installation bracket 2. The main body shell 1 is made of a transparent material or a non-transparent material with an opening to allow the user to see the internal transparent syringe 401 and the medication being used within it. A syringe 4 is fixedly engaged with the installation bracket 2. A push rod bracket 5 is fixedly connected to the piston rod 403 of the syringe 4. The push rod bracket 5 increases the pressing area of ​​the piston rod 403, facilitating the injection of highly viscous medications with greater force. The end of the push rod bracket 5 away from the main body shell 1 is adapted to be pressed to activate the first elastic claw 101, causing it to deform in the direction of disengagement from the extension plate 201. After the push rod bracket 5 activates the first elastic claw 101 in the direction of disengagement from the extension plate 201, the needle of the syringe 401 retracts into the main body shell 1. The inner wall of the main body shell 1 extends with several first guide plates 102 and second guide plates 103, and each second guide plate 103 is provided with a snap-fit ​​strip 104 parallel to the main body shell 1. The outer wall of the mounting bracket 2 is provided with a groove adapted to the first guide plate 102, and the edge of the first guide plate 102 is inserted into the groove of the outer wall of the mounting bracket 2. The end of the mounting bracket 2 away from the push rod bracket 5 is provided with several elastic extension pieces 203 parallel to its own axis, and each elastic extension piece 203 extends with two elastic claws 204 that commonly adapt to the adjacent snap-fit ​​strips 104. The cylindrical end of the main body shell 1 is snapped with a needle sleeve shell 6.

[0040] The internal cavity of the main body shell 1 is elastically press-fitted with the mounting bracket 2 as follows: A spring 3 is inserted into the notches of the first guide plate 102 and the second guide plate 103, and the other end of the spring 3 abuts against the end of the mounting bracket 2 where the first elastic claw 101 is located. The mounting bracket 2 has an annular groove for engaging the end of the spring 3. In the initial state of the injection device, the spring 3 is in a pre-compressed state, providing the power for the rebound of the mounting bracket 2 and the syringe 4. The main body shell 1 has a first elastic claw 101 on each side, and each first elastic claw 101 corresponds to an extension plate 201. After the push rod bracket 5 presses and actuates the first elastic claw 101 to deform in the direction of disengaging from the extension plate 201, the mounting bracket 2 and the syringe 4 move together under the elastic force of the spring 3, and the needle of the syringe 401 retracts into the main body shell 1 to avoid puncturing the human body.

[0041] The mounting bracket 2 secures the syringe 4 as follows: the syringe barrel 401 is held in place by claws extending from the elastic retaining plate 202 of the mounting bracket 2. Specifically, in the embodiment shown in the attached drawing, the mounting bracket 2 is provided with two elastic retaining plates 202, and each elastic retaining plate 202 is provided with two claws.

[0042] The syringe 4 also includes an injection piston 402 slidably mounted within the syringe barrel 401, and the injection piston 402 is fixedly connected to the piston push rod 403. The needle tip of the syringe barrel 401 is fitted with a needle sleeve 404, and the needle sleeve 404 is always held in place by at least two third elastic claws 602 of the needle sleeve housing 6. In the initial use of the injection device, the needle sleeve 404 is removed from the syringe barrel 401 needle tip simultaneously with the removal of the needle sleeve housing 6. The cylindrical end of the main body shell 1 is provided with two elastic arc plates 105 that hold the needle sleeve 404.

[0043] The needle sheath housing 6 is provided with at least two second elastic claws 601 that engage the cylindrical end of the main body housing 1. At least one guide rail 603 extends from the inner wall of the needle sheath housing 6, and the cylindrical end of the main body housing 1 is provided with a notch for insertion into the guide rail 603. In the embodiment shown in the attached drawings, the needle sheath housing 6 is provided with two second elastic claws 601, two third elastic claws 602, and two guide rails 603.

[0044] Several support rails of the push rod bracket 5 are adapted to the gap between the first guide plate 102 and the second guide plate 103, and the support rails of the push rod bracket 5 are always linearly slidably inserted between the first guide plate 102 and the second guide plate 103 to ensure stable movement of the push rod bracket 5 during the pushing process.

[0045] The inner wall of the main body shell 1 extends with two first guide plates 102 and two second guide plates 103, and the first guide plates 102 and the second guide plates 103 are staggered. The two elastic extension pieces 203 of the mounting bracket 2 are distributed on both sides of itself, and the free ends of the elastic extension pieces 203 are folded outward to extend elastic claws 204. The two elastic claws 204 extending from the same elastic extension piece 203 are mirrored, and the ends of the two mirrored elastic claws 204 together form a V-shaped opening for the insertion of the adapter clip 104.

[0046] Working principle:

[0047] When using the injection device in its initial state, hold the needle sheath 6 and pull out the needle sheath 404 together. Then, insert the needle into the body. Pressing the push rod bracket 5 with your finger will drive the piston push rod 403, further pushing the injection piston 402 to move, so that the drug in the syringe 401 is injected into the body by the injection piston 402. After the drug in the syringe 401 is completely injected, push the push rod bracket 5 to the bottom and press to trigger the first elastic claw 101 to deform in the direction of disengaging from the extension plate 201. Then release the push rod bracket 5, and the spring 3 will release the pressure. Under force, the first elastic claw 101 disengages from the extension plate 201, and the mounting bracket 2, syringe 4, and push rod bracket 5 move together. The needle of the syringe 401 retracts into the main body shell 1 to avoid puncturing the human body. During the movement of the mounting bracket 2, the locking strip 104 is inserted into the V-shaped opening formed by the two mirror-set elastic claws 204. The locking strip 104 is finally locked by the two elastic claws 204, and the locking strip 104 abuts against the folded part of the elastic extension piece 203, so that the locking strip 104 cannot move. At this time, the injection device is in a locked state.

[0048] When the injection device is in use, the needle sheath 6 and needle sheath 404 are pulled out and discarded, or the needle sheath 6 and needle sheath 404 are put back on the cylindrical end of the main body shell 1 together to prevent the residual medicine in the syringe 401 from dripping from the opening of the main body shell 1.

[0049] It should be noted that the above content merely illustrates the technical concept of this utility model and cannot be used to limit the scope of protection of this utility model. For those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and all such improvements and modifications fall within the scope of protection of the claims of this utility model.

Claims

1. An injection device with an automatic activation safety mechanism comprising a main body housing (1), characterized in that, The inner cavity of the main body shell (1) is elastically pressed with a mounting bracket (2) at the T-shaped end, wherein the first elastic clamping jaw (101) of the main body shell (1) clamps the extension plate (201) of the mounting bracket (2), the mounting bracket (2) is penetrated by a syringe (4) fixedly clamped therewith, the piston push rod (403) of the syringe (4) is fixedly connected with a push rod bracket (5), the end of the push rod bracket (5) away from the main body shell (1) is adapted to press and trigger the first elastic clamping jaw (101) to deform in the direction of being separated from the extension plate (201), the inner cavity wall of the main body shell (1) extends a plurality of first guide plates (102) and second guide plates (103), and each second guide plate (103) is provided with a clamping strip (104) parallel to the main body shell (1), the outer wall of the mounting bracket (2) is provided with a sliding groove matched with the first guide plate (102), the end of the mounting bracket (2) away from the push rod bracket (5) is provided with a plurality of elastic extension pieces (203) parallel to the axis of the mounting bracket (2), and each elastic extension piece (203) extends two elastic clamping jaws (204) which are commonly matched with adjacent clamping strips (104), and the cylindrical end of the main body shell (1) is clamped with a needle sleeve shell (6).

2. An injection device with an automatic firing safety mechanism as defined in claim 1, characterized in that The gaps of the first guide plate (102) and the second guide plate (103) are commonly clamped with a spring (3), and the other end of the spring (3) abuts against the end of the mounting bracket (2) provided with the first elastic clamping jaw (101).

3. An injection device with an automatic firing safety mechanism as defined in claim 1, characterized in that The needle barrel (401) of the syringe (4) is clamped by the clamping jaw extended by the elastic clamping plate (202) of the mounting bracket (2).

4. An injection device with an automatic firing safety mechanism according to claim 3, wherein, The syringe (4) further comprises: an injection piston (402) slidingly installed in the needle barrel (401), and the injection piston (402) is fixedly connected with the piston push rod (403).

5. An injection device with an automatic firing safety mechanism as defined in claim 3, wherein, The needle of the needle barrel (401) is matched with a needle sleeve (404), and the needle sleeve (404) is always clamped by at least two third elastic clamping jaws (602) of the needle sleeve shell (6).

6. An injection device with an automatic firing safety mechanism as defined in claim 1, characterized in that The needle sleeve shell (6) is provided with at least two second elastic clamping jaws (601) clamping the cylindrical end of the main body shell (1), the inner wall of the needle sleeve shell (6) extends at least one guide rail (603), and the cylindrical end of the main body shell (1) is provided with a gap into which the guide rail (603) is inserted.

7. An injection device with an automatic firing safety mechanism as defined in claim 1, wherein, The plurality of support rails of the push rod bracket (5) are adapted to the gap between the first guide plate (102) and the second guide plate (103), and the support rail of the push rod bracket (5) is always linearly slidingly inserted between the first guide plate (102) and the second guide plate (103).

8. An injection device with an automatic firing safety mechanism as defined in claim 1, wherein, The main body shell (1) is provided with a first elastic clamping jaw (101) on each side thereof, and each first elastic clamping jaw (101) corresponds to an extension plate (201).

9. An injection device with an automatic firing safety mechanism as defined in claim 1, wherein, The inner cavity wall of the main body shell (1) extends two first guide plates (102) and two second guide plates (103), and the first guide plates (102) and the second guide plates (103) are alternately arranged.

10. An injection device with an automatic firing safety mechanism according to claim 9, wherein, The two elastic extension pieces (203) of the mounting bracket (2) are distributed on both sides of the mounting bracket (2), and the free ends of the elastic extension pieces (203) are outwardly folded to extend the elastic clamping jaws (204), the two elastic clamping jaws (204) extended by the same elastic extension piece (203) are mirror image arranged, and the end portions of the two mirror image arranged elastic clamping jaws (204) jointly form a V-shaped opening into which the fitting clamping strip (104) is inserted.

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