Safe self-destruction syringe

Abstract

The utility model relates to an injector, and discloses a safe self-destruction injector which comprises an outer sleeve, a core rod, a rubber plug, a needle seat and a needle tube, the needle seat is installed at the front end of the outer sleeve, a sealing ring is arranged between the needle seat and the outer sleeve, the needle tube is fixedly installed on the needle seat, and one end, facing the core rod, of the needle seat is designed to be a self-destruction coupling body with a buckling groove. The rubber plug is fixedly connected to the front end of the core rod, the outer circle of the rubber plug is provided with a protruding ring matched with the inner wall of the outer sleeve, the end, facing the needle base, of the rubber plug is provided with a counter bore type containing cavity which is provided with a step and used for containing the self-destruction coupling body so as to form a non-return structure in a matched mode, the self-destruction coupling body is composed of a main body part and a flexible part, and the buckling groove is located in the main body part. The two ends of the flexible part are connected with the main body part and arranged on one side of the main body part, and the flexible part is provided with a deflection guiding body formed by a variable-size structure. According to the utility model, the structure and assembly of the injector are simplified, and the manufacturing cost is reduced while the use reliability and safety are ensured.

Description

Technical Field

[0001] The utility model relates to a disposable syringe which can self-destruct safely. Background Art

[0002] The safety self-destruction function of disposable syringes has attracted wide attention. The realization of this function should not affect the completion of normal injection, and at the same time, it should facilitate the destruction of the syringe to avoid reuse and facilitate the safe disposal of contaminated equipment. The puncture needle retractable self-destruction syringe has become the mainstream of self-destruction syringes because it can effectively protect medical staff and prevent accidental injuries. For example, a self-destruction safety syringe disclosed in CN2423897Y.

[0003] The main structure of a disposable syringe includes: an outer sleeve, a core rod matched with the outer sleeve, a rubber plug installed between the core rod and the outer sleeve, a sealing ring, a needle seat connected to the front end of the outer sleeve, and a needle tube installed on the needle seat. CN215426640U discloses a self-destructing disposable syringe, which includes a syringe, a push rod connected to the syringe, a piston sealing body arranged on the push rod, a needle seat corresponding to the push rod, and a corresponding self-destructing device, the self-destructing device includes a self-destructing coupling body, a buckling groove, and a self-destructing buckle device connected to the push rod, the self-destructing coupling body includes an arc or inclined wall surface arranged on the end face and / or corresponding one side of the needle seat, the buckling groove is arranged on the corresponding other side of the needle seat, and the self-destructing buckle device includes a plurality of self-destructing clamps arranged around the needle seat corresponding to the self-destructing coupling body and the buckling groove. It is necessary to further improve the structure of the disposable syringe to simplify the production and reduce the cost. Utility Model Content

[0004] In order to further reduce the production cost of disposable syringes, the technical problem to be solved by the utility model is to provide a safe self-destructive syringe.

[0005] The technical solution adopted by the utility model to solve the technical problem is: a safe self-destructive syringe, comprising an outer sleeve, a core rod, a rubber plug, a needle seat and a needle tube, the needle seat is installed at the front end of the outer sleeve, a sealing ring is arranged between the needle seat and the outer sleeve, the needle tube is fixedly installed on the needle seat, the end of the needle seat facing the core rod is designed as a self-destructive coupling body with a buckling groove, the rubber plug is fixedly connected to the front end of the core rod, a convex ring matching the inner wall of the outer sleeve is arranged on the outer circle of the rubber plug, a countersunk receiving cavity for receiving the self-destructive coupling body is arranged at the end of the rubber plug facing the needle seat, the receiving cavity is a variable diameter inner cavity with a step, the self-destructive coupling body can cooperate with the step to form a non-return structure, the self-destructive coupling body consists of a main body part and a flexible part that can be deformed relative to the main body part, the buckling groove is located on the main body part, wherein both ends of the flexible part are connected to the main body part and are arranged on one side of the main body part, and the flexible part has a deflection guide body formed by a variable size structure.

[0006] The receiving cavity is composed of a guide section, a small diameter section and a large diameter section in sequence. When the self-destructive coupling body enters the receiving cavity, the buckling groove cooperates with the step between the small diameter section and the large diameter section to form a non-return structure.

[0007] The front end of the core rod is located in the core rod engaging cavity in the rubber plug, and the core rod engaging cavity is not connected with the receiving cavity.

[0008] The maximum inner diameter of the receiving cavity is smaller than the maximum inner diameter of the engaging cavity.

[0009] The self-destructive coupling body of the needle seat is also provided with a mounting shoulder, the inner circle of the front end of the outer sleeve is provided with an inner circle step that matches the mounting shoulder, and the sealing ring is arranged between the front end surface of the outer sleeve and the inner circle step.

[0010] The inner circle step is used for bidirectional limiting of the needle seat, and a protrusion for limiting is arranged on the flexible part.

[0011] Two convex rings are arranged on the outer circle of the rubber plug.

[0012] The beneficial effects of the utility model are as follows: by improving the structure of the rubber plug, the structure and assembly of the syringe are simplified, the reliability and safety of use are ensured, and the manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is an assembly diagram of the utility model safety self-destructing syringe and its BB sectional view.

[0014] Figure 2 yes Figure 1 The main view of the middle jacket and its AA section view and top view.

[0015] Figure 3 yes Figure 1 Front view, top view and axonometric view of the core rod.

[0016] Figure 4 yes Figure 1 The main view of the middle rubber plug and its CC section view, top view and axonometric view.

[0017] Figure 5 yes Figure 1 Front view, top view, left view and right view of the center needle holder

[0018] Figure 6 yes Figure 1 Axonometric views of the needle holder at different angles.

[0019] Figure 7 yes Figure 1 Front view of the needle tube.

[0020] Figure 8 yes Figure 1 Front view of the middle seal ring.

[0021] Fig. 9 yes Figure 1 Schematic diagram of the matching relationship between the middle needle seat, rubber plug and outer sleeve.

[0022] Markings in the figure are: 1-outer sleeve, 2-core rod, 3-rubber plug, 4-needle seat, 5-needle tube, 6-sealing ring, 10-front end face, 11-inner circle step, 30-receiving cavity, 31-convex ring, 32-engaging cavity, 40-self-destructive coupling body, 41-snap groove, 42-deflection guide body, 43-installing shoulder, 44-protrusion, 300-guide section, 301-small diameter section, 302-step, 303-large diameter section, 400-center hole, 401-main body, 402-flexible part, 403-gap. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 9As shown, the safety self-destructing syringe of the utility model comprises a jacket 1, a core rod 2, a rubber plug 3, a needle seat 4, and a needle tube 5. The needle seat 4 is installed at the front end of the jacket 1, and a sealing ring 6 is arranged between the needle seat 4 and the jacket 1. The needle tube 5 is fixedly installed on the needle seat 4. The end of the needle seat 4 facing the core rod 2 is designed as a self-destructing coupling body 40 with a buckling groove 41. The rubber plug 3 is fixedly connected to the front end of the core rod 2. A convex ring 31 matching the inner wall of the jacket 1 is arranged on the outer circle of the rubber plug 3. The end of the rubber plug 3 facing the needle seat 4 is provided with a self-destructing coupling body 40. The countersunk receiving cavity 30 is a variable diameter inner cavity with a step 302. The self-destructive coupling body 40 can cooperate with the step 302 to form a non-return structure. The self-destructive coupling body 40 is composed of a main body part 401 and a flexible part 402 that can be deformed relative to the main body part 401. The buckling groove 41 is located on the main body part 401, wherein both ends of the flexible part 402 are connected to the main body part 401 and are arranged on one side of the main body part 401, and the flexible part 402 has a deflection guide body 42 formed by a variable size structure. The utility model improves the structure of the rubber plug and the needle seat. The rubber plug and the needle seat with a sealing ring on the outer cover have the function of limiting the injection liquid chamber and maintaining the seal, and also has the function of a destructive structure. The self-destructive coupling body 40 is composed of a main body 401 and a flexible part 402 that is deformable relative to the main body 401. The flexible part 402 has a deflection guide body 42 formed by a variable size structure. The above design enables the self-destructive coupling body 40 to be pushed toward one end of the rubber plug by the core rod 2 when the injection is completed, so that the receiving cavity 30 of the rubber plug 3 and the flexible part 402 are squeezed and deformed against each other at the same time, thereby joining to a When the buckling groove 41 cooperates with the step 302, the deflection guide body 42 formed by the variable size structure of the flexible part 402 will cause the needle seat 4 and the needle tube 5 to deflect when they retreat into the inner part of the outer sleeve 1, thereby forming a one-way limit between the needle tube 5 and the outer sleeve 1, preventing the needle seat 4 from being pushed forward again by the core rod 2, thereby completing a more reliable and safe destruction; the connection between the rubber plug 3 and the core rod 2 is also changed from the conventional rubber plug sleeved on the outer circle of the core rod to the rubber plug 3 being fixedly connected to the front end of the core rod 2 facing the needle seat 4, reducing the design of the upper limit structure of the outer sleeve 1, simplifying the overall structure and manufacturing, and reducing the manufacturing cost.

[0025] like Figure 1 , Figure 5 and Figure 6 As shown, one end of the needle seat 4 has a central hole 400 for installing the needle tube 5, and the other end of the needle seat 4 is the self-destructive coupling body 40. There is a gap 403 between the main part 401 and the flexible part 402. The gap 403 is connected to the central hole 400 to ensure that the sealed cavity formed by the needle seat 4, the outer sleeve 1 and the rubber plug 3 can be connected to the needle tube 5. At the same time, the deformation space allowed by the gap 403 enables the needle seat to be limited at both ends of the axial direction when assembled to the front end of the outer sleeve.

[0026] like Figure 1 , Figure 2 and Figure 5 , Figure 6 As shown, the front end of the outer sleeve 1 is designed with a matching structure connected with the needle seat 4 to facilitate the assembly and positioning of the needle seat, and a sealing ring 6 is arranged between the outer circle of the needle seat 4 and the inner wall of the outer sleeve 1. The main body 401 of the self-destructive coupling body 40 is also provided with a mounting shoulder 43, and the inner circle of the front end of the outer sleeve 1 is provided with an inner circle step 11 that matches the mounting shoulder 43. The flexible part 402 is provided with a protrusion 44 for limiting. The protrusion 44 and the mounting shoulder 43 are axially staggered at a position roughly equivalent to the thickness of the reduced diameter part at the inner circle step 11, so as to achieve axial limiting at both ends, so that the needle seat 4 can be reliably connected to the front end of the outer sleeve 1. The sealing ring 6 is arranged between the front end surface 10 of the outer sleeve 1 and the inner circle step 11, and plays a role in closing the injection liquid chamber.

[0027] like Figure 1 , Figure 3 and Figure 4 As shown, the front end of the core rod 2 is located in the core rod 2 engaging cavity 32 in the plug 3. The above design facilitates the connection and assembly of the plug 3 and the core rod 2. The engaging cavity 32 of the core rod 2 should not be connected to the receiving cavity 30, so that the plug 3 plays a role in closing the injection liquid cavity.

[0028] like Figure 4 and Fig. 9 As shown, in order to promote the core rod 2 to push the receiving cavity 30 and the flexible portion 402 of the rubber plug 3 to squeeze and deform each other and thus join together, the front end of the receiving cavity 30 is provided with a guide section 300, and the step 302 is formed by the small diameter section 301 and the large diameter section 303 to cooperate with the buckle groove 41. Figure 4 As shown, in order to ensure that the rubber plug 3 has appropriate strength to maintain its sealing function, the inner diameters of the coupling cavity 32 where the core rod 2 and the rubber plug 3 are coupled and the receiving cavity 30 where the needle seat 4 and the rubber plug 3 are coupled are relatively small relative to the overall size of the rubber plug 3, and the portion of the core rod 2 entering the coupling cavity 32 can play a role in increasing the local strength of the rubber plug 3, while the inner diameter of the receiving cavity 30 is smaller than the inner diameter of the coupling cavity 32.

[0029] like Figure 1 , Figure 4 and Fig. 9 As shown, two convex rings 31 are arranged on the outer circle of the rubber plug 3 , which increases the reliability of the seal between the rubber plug 3 and the outer sleeve 1 .

Claims

1. A safety self-destructing syringe, comprising a jacket (1), a core rod (2), a rubber plug (3), a needle seat (4), and a needle tube (5), wherein the needle seat (4) is mounted at the front end of the jacket (1), a sealing ring (6) is provided between the needle seat (4) and the jacket (1), the needle tube (5) is fixedly mounted on the needle seat (4), and one end of the needle seat (4) facing the core rod (2) is designed as a self-destructing coupling body (40) having a buckling groove (41), wherein: The rubber plug (3) is fixedly connected to the front end of the core rod (2); a convex ring (31) is provided on the outer circle of the rubber plug (3) and matches the inner wall of the outer sleeve (1); a countersunk receiving cavity (30) for receiving the self-destructive coupling body (40) is provided at one end of the rubber plug (3) facing the needle seat (4); the receiving cavity (30) is a variable diameter inner cavity with a step (302); the self-destructive coupling body (40) can cooperate with the step (302) to form a non-return structure; the self-destructive coupling body (40) is composed of a main body (401) and a flexible part (402) that is deformable relative to the main body (401); the buckling groove (41) is located on the main body (401); the two ends of the flexible part (402) are connected to the main body (401) and are arranged on one side of the main body (401); the flexible part (402) has a deflection guide body (42) formed by a variable size structure.

2. The safety self-destructing syringe according to claim 1, characterized in that: The receiving cavity (30) is sequentially composed of a guide section (300), a small diameter section (301) and a large diameter section (303), and the step (302) that cooperates with the buckling groove (41) is formed between the small diameter section (301) and the large diameter section (303).

3. The safety self-destructing syringe according to claim 1, characterized in that: The front end of the core rod (2) is located in a core rod (2) engagement cavity (32) in the rubber plug (3), and the engagement cavity (32) of the core rod (2) is not connected to the receiving cavity (30).

4. The safety self-destructing syringe according to claim 3, characterized in that: The maximum inner diameter of the receiving cavity (30) is smaller than the maximum inner diameter of the engaging cavity (32).

5. The safety self-destructing syringe according to claim 1, characterized in that: The main body (401) of the self-destructive coupling body (40) is also provided with a mounting shoulder (43), the inner circle of the front end of the outer sleeve (1) is provided with an inner circle step (11) that cooperates with the mounting shoulder (43), and the sealing ring (6) is arranged between the front end surface (10) of the outer sleeve (1) and the inner circle step (11).

6. The safety self-destructing syringe according to claim 5, characterized in that: The inner circular step (11) is used for bidirectional limiting of the needle seat (4), and a protrusion (44) for limiting is provided on the flexible portion (402).

7. The safety self-destructing syringe according to claim 1, characterized in that: Two convex rings (31) are arranged on the outer circle of the rubber plug (3).

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