Snap ring self-destruct syringe

Abstract

The present invention belongs to the technical field of syringes, and specifically relates to a snap ring type self-destruct syringe, which includes a syringe, a core rod and a piston; a snap ring is mounted on the core rod, and the snap ring is an annular structure composed of a body block and at least one movable block, a snap opening is provided on the side wall of the syringe corresponding to the movable block, and an inner groove is provided on the inner wall of the syringe corresponding to the body block; a snap ring guide structure is provided in the syringe; a push platform is provided on the upper part of the core rod corresponding to the body block and the movable block; under the action of the push platform, the outer end of the movable block is pushed into the snap opening on the side wall of the syringe, and the outer end of the body block is pushed into the inner groove; a downwardly extending spring piece is also provided on the core rod; in the initial state, the spring piece is located below the snap ring; when the spring piece moves upward through the positioned snap ring, it is compressed and contracted, and when it moves above the snap ring, it is reset and the core rod is locked. The snap ring type self-destruct syringe can achieve self-destruction during the process of injecting liquid medicine, and compared with traditional self-destruct syringes, it can fundamentally avoid the secondary use of syringes and eliminate safety hazards.

Description

Technical Field

[0001] The invention relates to a clamp-ring type self-destructive syringe, belonging to the technical field of syringes. Background Art

[0002] Syringes are mainly used to inject or extract liquids and are indispensable tools in the medical field. Since used syringes often have many risks such as cross-infection of diseases, spread of contamination sources, mixing of residual drugs with new drugs, causing drug modification and thus causing patient allergies or affecting treatment effects, most of the medical syringes currently on the market are disposable devices and are prohibited from being reused. In addition, they must be destroyed in strict accordance with industry standards after use.

[0003] However, in actual operation, there may be cases where the syringe is not destroyed or is not destroyed in accordance with the specification. What's more, some medical institutions or individuals may choose to illegally reuse the syringe or sell it to illegal recyclers for economic interests, which poses a serious threat to medical safety and public health safety. It is difficult to avoid the reuse of syringes by relying solely on industry standards. Therefore, in recent years, people have been continuously studying self-destructive syringes, striving to destroy the syringe through simple operations after the syringe is used through structural improvements, and solving the problem of syringe reuse from the source. The self-destructive safety syringe described in the publication number CN2539533Y is one of them. It is equipped with a stop ring at the rear end of the outer jacket. After the injection is completed, the core rod is pulled back to the position of the stop ring, and the core rod is locked with the stop ring so that it cannot move forward and backward, and the core rod can be broken through the weak area on the core rod to achieve the self-destruction effect. However, since the self-destruction operation is started separately by the user after the injection is completed, it is still affected by human factors, such as the user forgetting to complete the self-destruction operation or deliberately not performing the self-destruction operation, etc., and the problem of syringe reuse cannot be avoided. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a clamp-type self-destructing syringe that can achieve self-destruction during the injection of liquid medicine without affecting the injection operation, thereby effectively avoiding secondary use and eliminating safety hazards.

[0005] The clamp-ring type self-destructive syringe of the present invention comprises a syringe, a core rod and a piston;

[0006] A clamping ring is mounted on the core rod. The clamping ring is an annular structure composed of a body block and at least one movable clamping block. A clamping opening is provided on the side wall of the syringe corresponding to the movable clamping block, and an inner groove is provided on the inner wall of the syringe corresponding to the body block.

[0007] A clamping ring guide structure is provided inside the syringe;

[0008] A push platform is provided on the upper part of the core rod corresponding to the main body block and the movable clamping block; under the action of the push platform, the outer end of the movable clamping block (i.e. the end of the movable clamping block away from the core rod) is pushed into the bayonet of the side wall of the syringe, and the outer end of the main body block (i.e. the end of the main body block away from the core rod) is pushed into the inner groove;

[0009] The core rod is also provided with a downwardly extending spring sheet; in the initial state (i.e. when the syringe is not in use), the spring sheet is located below the retaining ring; when the core rod is pushed upward, the spring sheet is compressed and contracted when passing through the positioned retaining ring, and it continues to move upward to the top of the retaining ring and then resets and the core rod is locked.

[0010] The use process of the clamp-type self-destructing syringe of the present invention is as follows:

[0011] ① Extracting liquid medicine:

[0012] The core rod is pulled toward the rear end of the syringe to draw the medicine into the syringe. During the process of drawing the medicine, the clamping ring moves toward the rear of the syringe driven by the core rod, and moves to the position of the clamping mouth and inner groove of the syringe under the action of the clamping ring guide structure. The core rod is continued to be pulled backward, and the outer end of the movable clamping block and the outer end of the main body block are respectively pushed into the clamping mouth and inner groove of the side wall of the syringe through the push platform to realize the positioning of the clamping ring, and then the core rod is continued to be pulled backward until the medicine is completely drawn out;

[0013] ② Push injection of liquid medicine:

[0014] Push the core rod toward the front end of the syringe. When the spring on the core rod passes the positioned clamping ring, the spring elastically contracts inward. Continue to push the medicine forward so that the spring moves above the clamping ring. At this time, the spring resets (i.e. opens again) under the action of its own elastic force until the injection of the medicine is completed.

[0015] When the spring piece moves to the top of the clamp ring, the clamp ring limits the spring piece, so that the spring piece cannot pass through the clamp ring from top to bottom, thereby effectively preventing the core rod from descending again, so that the clamp ring type self-destructing syringe cannot perform a secondary operation of extracting liquid medicine, that is, the clamp ring type self-destructing syringe of the present invention realizes self-destruction in the process of pushing liquid medicine, effectively avoiding the secondary use of the syringe and eliminating safety hazards; at the same time, after the clamp ring type self-destructing syringe self-destructs, the core rod can continue to be pushed forward until the operation of pushing liquid medicine is completed, and the operation of pushing liquid medicine will not be affected by its self-destruction.

[0016] Preferably, the width of the rear portion of the movable block (ie, the portion of the movable block close to the core rod) is greater than the width of the bayonet, which can prevent the entire movable block from escaping from the bayonet on the side wall of the syringe.

[0017] Preferably, the rear of the movable block has left and right wings, and the width of the rear of the movable block with wings is greater than the width of the bayonet, effectively preventing the movable block from falling out of the bayonet. Preferably, the left and right wings of the rear of the movable block can be elastically deformed along the left and right directions, and the movable block is pressed against the main body block through the two wings.

[0018] Preferably, the snap ring guide mechanism includes a guide strip arranged on the core rod and a guide groove arranged on the main body block and / or the movable clamping block to cooperate with the guide strip. The main body block and the movable clamping block of the snap ring are guided by the snap ring guide mechanism so that the main body block and the movable clamping block can move to the corresponding bayonet and inner groove position on the syringe, thereby finally realizing the positioning of the snap ring.

[0019] Preferably, the movable clamping block is two pieces, and the two movable clamping blocks are arranged symmetrically on the left and right, and two symmetrical bayonet holes are opened on the side wall of the syringe corresponding to the two movable clamping blocks; the main body block is arranged in two front and rear pieces, and the main body block and the movable clamping block are arranged at intervals. After the clamp ring adopts this structural form, the structure will be more stable when moving and being positioned. Further preferably, the spring sheet is arranged in two pieces, and the two spring sheets are arranged on the front and rear sides of the lower part of the core rod and are respectively arranged corresponding to the front and rear two main body blocks.

[0020] Of course, the number of movable blocks can be adjusted according to actual conditions, and the number of bayonet ports, body blocks, and card slots can be adaptively adjusted accordingly. At the same time, the body blocks and movable blocks are spaced apart to ensure the stability of the clamping ring structure.

[0021] Preferably, when the spring moves above the clamp ring, the piston does not contact or just contacts the inner top of the syringe, ensuring that the syringe completes self-destruction during the drug injection process, at the latest after all the drugs have been injected.

[0022] Preferably, the bayonet is a through hole, and when the snap ring is positioned, the movable block is just inserted into the bayonet, and the through hole allows the user of the syringe to conveniently observe whether the snap ring is positioned.

[0023] Preferably, the bayonet and the inner groove are arranged at the rear of the syringe to ensure that the normal injection function of the syringe is not affected.

[0024] Compared with the prior art, the clamp-ring type self-destructing syringe of the present invention has the following beneficial effects:

[0025] The clamp-type self-destruct syringe of the present invention can realize self-destruction during the process of pushing the medicine liquid through the cooperation of the clamp and the spring. Compared with the traditional self-destruct syringe, it is easy to operate and does not need to start the self-destruction operation after the injection. The secondary use of the syringe is fundamentally avoided and the safety hazard is eliminated. Since the present invention adopts the method of limiting the rear part of the core rod to prevent the secondary extraction of the medicine liquid, although self-destruction is realized during the process of pushing the medicine liquid, it will not affect the operation of pushing the medicine liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 is a schematic diagram of the structure of the first embodiment in the initial state;

[0027] Figure 2 yes Figure 1 AA section view;

[0028] Figure 3 This is a schematic diagram of the structure of the first embodiment after the syringe is hidden;

[0029] Figure 4 is a schematic diagram of the structure of the syringe in Example 1;

[0030] Figure 5 is a structural schematic diagram of the core rod in the first embodiment;

[0031] Figure 6 is a schematic diagram of the structure of the active card block in the first embodiment;

[0032] Figure 7 is a schematic structural diagram of the first embodiment after the snap ring is positioned;

[0033] Figure 8 It is a structural schematic diagram of the first embodiment in the self-destruct state.

[0034] In the figure: 1, syringe; 2, core rod; 3, piston; 4, retaining ring; 5, bayonet; 6, push platform; 7, movable clamping block; 8, main body block; 9, spring piece; 10, guide strip; 11, guide groove; 12, inner groove; 13, side wing; 14, outer end of movable clamping block. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0036] Embodiment 1:

[0037] like Figure 1-8 As shown, the clamp-type self-destructive syringe of this embodiment comprises a syringe 1, a core rod 2 and a piston 3;

[0038] A snap ring 4 is mounted on the core rod 2. The snap ring 4 is an annular structure consisting of a body block 8 and at least one movable block 7. A snap opening 5 is provided on the side wall of the syringe 1 corresponding to the movable block 7, and an inner groove 12 is provided on the inner wall of the syringe 1 corresponding to the body block 8; a snap ring guide structure is provided in the syringe 1; a push platform 6 is provided on the upper part of the core rod 2 corresponding to the body block 8 and the movable block 7; under the action of the push platform 6, the outer end 14 of the movable block is pushed into the snap opening 5 on the side wall of the syringe 1, and the outer end of the body block 8 is pushed into the inner groove 12; a downwardly stretched spring piece 9 is also provided on the core rod 2; in the initial state (i.e., when the syringe is not in use), the spring piece 9 is located below the snap ring 4; when the core rod 2 is pushed upward, the spring piece 9 is compressed and contracted when passing through the positioned snap ring 4, and it continues to move upward to the top of the snap ring 4 and then resets and the core rod 2 is locked.

[0039] In this embodiment, there are two movable clamping blocks 7, which are symmetrically arranged on the left and right. Two symmetrical bayonet openings 5 ​​are opened on the side wall of the syringe 1 corresponding to the two movable clamping blocks 7; the main body block 8 is arranged in two front and rear blocks, and the main body block 8 is arranged at a distance from the movable clamping block 7; there are also two spring sheets 9, which are arranged on the front and rear sides of the lower part of the core rod 2 and correspond to the front and rear main body blocks 8 respectively.

[0040] In this embodiment, the rear of the movable block 7 has left and right side wings 13, and the rear width of the movable block 7 with the side wings 13 is greater than the width of the bayonet 5 to prevent the movable block 7 from escaping from the bayonet 5 on the side wall of the syringe 1. In this embodiment, the left and right side wings 13 at the rear of the movable block 7 can be elastically deformed along the left and right directions, and the movable block 7 is pressed against the body block 8 through the side wings 13.

[0041] The snap ring guide mechanism in this embodiment includes a guide strip 10 arranged on the core rod 2 and a guide groove 11 arranged on the main body block 8 and the movable clamping block 7 to cooperate with the guide strip 10. The snap ring guide mechanism guides the main body block 8 and the movable clamping block 7 of the snap ring 4 so that the main body block 8 and the movable clamping block 7 can move to the corresponding bayonet 5 and inner groove 12 positions on the syringe 1, thereby finally realizing the positioning of the snap ring 4.

[0042] In order to facilitate the syringe user to observe whether the clamp ring 4 is positioned, in this embodiment, the clamp port 5 is designed as a through hole. When the clamp ring 4 is positioned, the movable clamp block 7 is just clamped into the clamp port 5.

[0043] In order to ensure that the normal injection function of the syringe is not affected, the bayonet 5 and the inner groove 12 are designed at the rear of the syringe 1 .

[0044] In addition to the above, when the spring piece 9 on the core rod 2 moves up to the top of the main body block 8 of the clamp ring 4, the piston 3 does not contact or just contacts the inner top of the syringe 1 to ensure that the syringe completes self-destruction during the drug injection process, at the latest after the drug is fully injected.

[0045] The use process of the clamp-type self-destructing syringe described in this embodiment is as follows:

[0046] ① Extracting liquid medicine:

[0047] The core rod 2 is pulled toward the rear end of the syringe 1 to draw the liquid medicine into the syringe 1. During the process of drawing the liquid medicine, the clamp ring 4 moves toward the rear of the syringe 1 under the drive of the core rod 2, and moves to the position of the bayonet 5 and the inner groove 12 of the syringe 1 under the action of the clamp ring guide structure. The core rod 2 is continued to be pulled backward, and the outer end 14 of the movable clamp block and the outer end of the body block 8 are respectively pushed into the bayonet 5 and the inner groove 12 of the side wall of the syringe 1 through the push platform 6 to achieve the positioning of the clamp ring 4, and then the core rod 2 is continued to be pulled backward until the liquid medicine is completely drawn out;

[0048] ② Push injection of liquid medicine:

[0049] The core rod 2 is pushed toward the front end of the syringe 1. When the spring pieces 9 on both sides of the core rod 2 pass through the main body block 8 of the positioned clamping ring 4, the spring pieces 9 on both sides elastically contract inward, and the liquid medicine is continuously pushed forward so that the spring pieces 9 of the core rod 2 move to the top of the main body block 8. At this time, the spring pieces 9 on both sides are reset (i.e., open again) under the action of their own elastic force until the injection of the liquid medicine is completed.

[0050] When the spring piece 9 reaches the top of the main body block 8, the main body block 8 limits the spring piece 9, so that the spring piece 9 cannot pass through the main body block 8 from top to bottom, thereby effectively preventing the core rod 2 from descending again, making it impossible for the clamp ring type self-destruct syringe described in this embodiment to perform a secondary extraction operation of the liquid medicine.

[0051] The clamp-type self-destruct syringe described in this embodiment can achieve self-destruction during the injection of liquid medicine through the cooperation of the clamp 4 and the spring 9. Compared with the traditional self-destruct syringe, there is no need to start the self-destruct operation after the injection, which effectively avoids the secondary use of the syringe and eliminates safety hazards.

Claims

1. A snap ring type self-destructing syringe, comprising a syringe barrel (1), a core rod (2) and a piston (3), characterized in that: A snap ring (4) is sleeved on the core rod (2); The clamping ring (4) is an annular structure composed of a main body block (8) and at least one movable clamping block (7); a clamping opening (5) is provided on the side wall of the syringe (1) corresponding to the movable clamping block (7); and an inner groove (12) is provided on the inner wall of the syringe (1) corresponding to the main body block (8); A clamping ring guide structure is provided inside the syringe (1); A push platform (6) is provided on the upper part of the core rod (2) corresponding to the main body block (8) and the movable clamping block (7); under the action of the push platform (6), the outer end (14) of the movable clamping block is pushed into the clamping opening (5) of the side wall of the syringe (1), the outer end of the main body block (8) is pushed into the inner groove (12), and the clamping ring (4) is positioned; The core rod (2) is also provided with a spring sheet (9) extending downward and outward; in an initial state, the spring sheet (9) is located below the snap ring (4); when the core rod (2) is pushed upward, the spring sheet (9) is compressed and contracted when passing through the positioned snap ring (4), and it continues to move upward to above the snap ring (4) and then resets, and the core rod (2) is locked; The rear width of the movable clamping block (7) is greater than the width of the clamping opening (5); The rear portion of the movable clamping block (7) has left and right side wings (13), and the rear width of the movable clamping block (7) having the side wings (13) is greater than the width of the clamping port (5); The left and right side wings (13) at the rear of the movable clamping block (7) can be elastically deformed along the left and right directions, and the movable clamping block (7) is pressed against the main body block (8) through the two side wings (13); The movable clamping blocks (7) are two in number, and the two movable clamping blocks (7) are symmetrically arranged on the left and right sides. Two symmetrical clamping openings (5) are provided on the side wall of the syringe (1) corresponding to the two movable clamping blocks (7); the main body block (8) is provided with two front and rear blocks, and the main body block (8) and the movable clamping block (7) are arranged at a distance.

2. The clamp-type self-destructing syringe according to claim 1, characterized in that: The clamp ring guide mechanism comprises a guide strip (10) arranged on the core rod (2) and a guide groove (11) arranged on the body block (8) and / or the movable clamp block (7) in cooperation with the guide strip (10).

3. The clamp-type self-destructing syringe according to claim 1 or 2, characterized in that: The spring sheets (9) are provided in two pieces, and the two spring sheets (9) are arranged on the front and rear sides of the lower part of the core rod (2) and are respectively arranged corresponding to the front and rear body blocks (8).

4. The clamp-type self-destructing syringe according to claim 1 or 2, characterized in that: When the spring sheet (9) moves upward to the top of the clamping ring (4), the piston (3) does not contact or just contacts the inner top of the syringe (1).

5. The clamp-type self-destructing syringe according to claim 1 or 2, characterized in that: The bayonet (5) is a through hole.

6. The clamp-type self-destructing syringe according to claim 1 or 2, characterized in that: The bayonet (5) and the inner groove (12) are arranged at the rear of the syringe (1).

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