Retractable self-destruction syringe

Abstract

The utility model relates to the technical field of injectors, in particular to a retraction type self-destruction injector which comprises an injection cylinder, a piston rod is movably inserted in the injection cylinder, a clamping ring is clamped in the piston rod, a spring sleeve is clamped in the clamping ring, and a clamping block is arranged at the bottom of the spring sleeve. The bottom of the syringe is sleeved with a needle base in a threaded mode, a needle sleeve part is inserted into the needle base, a plurality of clamping jaws are fixedly connected to the top of the needle sleeve part at equal intervals in the circumferential direction, and the clamping blocks correspond to the clamping jaws. According to the self-destruction syringe, the spring sleeve can be pushed to move upwards under the influence of the elastic force of the spring, the needle sleeve piece and the needle tube are driven by the spring sleeve to move upwards to enter the syringe, the self-destruction effect is achieved, and through the self-destruction treatment, the syringe cannot be used for injection again after being used; and therefore, recovery and repeated use of the device by bad people are effectively prevented, and the risk of cross infection of infectious diseases is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to syringe technical field, concretely is a kind of self-destruction syringe of retraction type. BACKGROUND

[0002] As an important tool in medical process, the original intention of syringe is to safely and effectively deliver medicine or liquid into patient's body.

[0003] Syringe generally includes injection cylinder, needle tube and piston rod, with reusable, since the structure is still complete after use, it is easy to be recycled, cleaned and reused by lawbreaker, which not only violates the disposable use principle of medical equipment, but also greatly increases the risk of cross infection of infectious diseases through blood route, in view of this, a self-destruction syringe of retraction type is involved. SUMMARY

[0004] In view of the deficiencies of prior art, the utility model provides a self-destruction syringe of retraction type, with self-destruction effect, the syringe cannot be used for injection again after use, thereby effectively prevent bad personnel from recycling and reusing it, reduce the risk of cross infection of infectious diseases.

[0005] To solve the above technical problems, the utility model provides the following technical scheme: a self-destruction syringe of retraction type, including injection cylinder, the inside of injection cylinder is movably connected with piston rod, the inside of piston rod is connected with snap ring, the inside of snap ring is connected with spring sleeve, the bottom of spring sleeve is fixedly connected with clamping block;

[0006] The bottom of injection cylinder is provided with needle seat, the inside of needle seat is connected with needle sleeve, the top of needle sleeve is fixedly connected with a plurality of clamping claws in equal distance, and the top of clamping claw is inclined inward, and the clamping block corresponds to the clamping claw.

[0007] Further, the shape of the clamping block is frustum, and the outer diameter of the clamping block gradually decreases away from the piston rod.

[0008] Further, a clamping space is formed between the plurality of clamping claws, and the clamping block is clamped in the clamping space.

[0009] Further, a needle tube is embedded in the middle of the needle sleeve, and the top of the needle tube is communicated with the clamping space.

[0010] Further, a sealing ring is arranged at the connection between the injection cylinder and the needle seat, and the sealing ring is sleeved on the outer surface of the needle sleeve.

[0011] Further, a spring is arranged between the spring sleeve and the piston rod, the top of the spring abuts against the spring sleeve, and the bottom of the spring abuts against the top of the snap ring.

[0012] Further, the outer surface of the snap ring is sleeved with a rubber plug, a through hole for the clamping block to pass through is arranged in the middle of the rubber plug, and the clamping block is located at the bottom of the rubber plug.

[0013] Further, the outer diameter of the bottom cylinder of the spring sleeve is the same as the inner diameter of the through hole on the rubber plug, the maximum outer diameter of the clamping block is smaller than the inner diameter of the through hole on the rubber plug, the spring sleeve is integrally formed with the clamping block, and the inner diameter of the through hole on the rubber plug is greater than the outer diameter of the needle sleeve.

[0014] Further, the top of the piston rod is fixedly connected with a pressing plate, and the outer diameter of the pressing plate is greater than the outer diameter of the piston rod.

[0015] Further, the outer surface of the needle seat is sleeved with a protective sleeve, and the needle tube is located in the interior of the protective sleeve.

[0016] By means of the above technical scheme, the retractable self-destruction injector provided by the utility model has at least the following beneficial effects:

[0017] 1. After injection is completed, the injector is in an injection zero position state, at this time, the clamping block is clamped between the plurality of clamping claws, and the piston rod is continuously pushed downward, under the influence of the spring force, the spring sleeve is pushed to move upward, the needle sleeve and the needle tube are driven by the spring sleeve to move upward into the injection barrel, the self-destruction effect is completed, through the self-destruction treatment, the injector cannot be used for injection again after use, thereby effectively preventing bad personnel from recycling and repeatedly using the injector, and the risk of cross infection of infectious diseases is reduced.

[0018] 2. After injection is completed, the needle tube is automatically retracted into the injection barrel, the risk that medical staff is pricked when handling the injector is reduced, and the professional safety is improved.

[0019] 3. The spring provided in the injector provides power for automatic retraction, after injection is completed, the piston rod is continuously pushed downward, the piston rod and the spring sleeve are disengaged from the clamped state, at this time, the spring rapidly releases energy, the needle sleeve and the needle tube are pushed to retract upward along the interior of the injection barrel, and the self-destruction effect is completed. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings described herein are used to provide further understanding of the utility model and constitute a part of the present application:

[0021] Figure 1 It is a structural schematic view of the utility model;

[0022] Figure 2 It is a structural schematic view of the utility model in an injection zero position state;

[0023] Figure 3 Structure diagram when the utility model is in self-destruction state;

[0024] Figure 4 The utility model discloses a partial enlarged view of A in the utility model Figure 1 .

[0025] Figure 5 The utility model discloses a partial enlarged view of B in the utility model Figure 2 .

[0026] In the drawing: 1, syringe; 2, piston rod; 3, snap ring; 4, spring cover; 5, clamping block; 6, needle seat; 7, needle cover; 8, clamping jaw; 9, needle tube; 10, sealing ring; 11, spring; 12, rubber plug; 13, protective sleeve; 14, pressing plate. Specific implementation

[0027] The technical scheme in the embodiments of the utility model will be apparently and completely described below with the drawings in the embodiments of the utility model, and apparently, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the range protected by the utility model.

[0028] Please refer to Figures 1-5 , a retractable self-destruction syringe, including syringe 1, the inside movable plug connection of syringe 1 has piston rod 2, the inside of piston rod 2 is connected with snap ring 3, the inside of snap ring 3 is connected with spring cover 4, and the bottom of spring cover 4 is fixedly connected with clamping block 5;

[0029] The bottom of syringe 1 is threadedly sleeved with needle seat 6, needle seat 6 is inserted with needle cover 7 in the inside, a plurality of clamping jaws 8 are fixedly connected in the top of needle cover 7 in the form of equidistant circle, and the top of clamping jaw 8 is inwardly inclined, and clamping block 5 corresponds to clamping jaw 8. After injection, the syringe will be in the injection zero position, at this time, the clamping block 5 will be clamped between the plurality of clamping jaws 8, and the inner wall of the piston rod 2 will press the spring cover 4 by clamping, and the spring 11 will have elastic potential energy due to the pressure. When the syringe is self-destroyed after injection, the piston rod 2 is continuously pushed down, and the clamping point in the piston rod 2 is over the top of the spring cover 4, so that the spring cover 4 is released, and the spring 11 will eject the spring cover 4 and the needle cover 7 clamped on the spring cover 4 upwards, so as to pull the needle cover 7 into the syringe 1. Through the self-destruction treatment, the syringe cannot be used for injection again after use, so as to effectively prevent the recycling and reuse of the syringe by unqualified personnel, and reduce the risk of cross infection of infectious diseases.

[0030] The shape of the clamping block 5 is a circular truncated cone, and the outer diameter of the clamping block 5 gradually decreases in the direction away from the piston rod 2. A clamping space is formed between the plurality of clamping claws 8, and the clamping block 5 is clamped in the clamping space. The circular truncated cone-shaped clamping block 5 can be more tightly clamped in the clamping space formed by the plurality of clamping claws 8. Since the outer diameter of the clamping block 5 gradually decreases, when the clamping block 5 moves downward, the plurality of clamping claws 8 will be gradually expanded by the extrusion of the clamping block 5, facilitating the clamping of the clamping block 5 between the plurality of clamping claws 8, thereby ensuring the stability of the clamping, and preventing accidental separation between the clamping block 5 and the clamping claw 8 after injection is completed, ensuring the smooth progress of the self-destruction program.

[0031] The middle part of the needle sleeve assembly 7 is embedded with a needle tube 9, and the top of the needle tube 9 communicates with the clamping space, ensuring that the drug liquid transmission path from the syringe barrel 1 to the needle tube 9 is complete and unobstructed. When the piston rod 2 is pushed, the drug liquid can smoothly pass through the space in the syringe barrel 1, the plurality of clamping claws 8 and the needle sleeve assembly 7, and finally be injected into the patient's body through the needle tube 9.

[0032] A sealing ring 10 is arranged at the connection between the syringe barrel 1 and the needle seat 6, and the sealing ring 10 is arranged on the outer surface of the needle sleeve assembly 7. The sealing ring 10 can tightly fit the connecting surface of the syringe barrel 1 and the needle seat 6, preventing the drug liquid from leaking out of the connection during injection, and ensuring the accuracy and safety of injection.

[0033] A spring 11 is arranged between the spring sleeve 4 and the piston rod 2. The top of the spring 11 abuts against the spring sleeve 4, and the bottom of the spring 11 abuts against the top of the clamping ring 3. The arrangement of the spring 11 provides the syringe with automatic retraction power. After injection is completed, the piston rod 2 is continuously pushed downward, and the piston rod 2 and the spring sleeve 4 are disengaged. At this time, the spring 11 will quickly release energy to push the needle sleeve assembly 7 and the needle tube 9 to retract upward along the inside of the syringe barrel 1, completing the self-destruction effect.

[0034] A rubber plug 12 is arranged on the outer surface of the clamping ring 3. The rubber plug 12 has a through hole for the clamping block 5 to pass through, and the clamping block 5 is located at the bottom of the rubber plug 12. The rubber plug 12 serves as a sealing element between the piston rod 2 and the syringe barrel 1, and can tightly fit the inner wall of the syringe barrel 1 to prevent the drug liquid from leaking out of the gap between the piston rod 2 and the syringe barrel 1 during injection.

[0035] The outer diameter of the bottom cylinder of the spring sleeve 4 is the same as the inner diameter of the through hole of the rubber plug 12, and the through hole of the rubber plug 12 is blocked by the bottom cylinder of the spring sleeve 4, so that the medicine liquid cannot enter the piston rod 2 from the through hole of the rubber plug 12, and the sealing effect is achieved, and the incomplete injection of the medicine liquid is avoided. The maximum outer diameter of the clamping block 5 is smaller than the inner diameter of the through hole of the rubber plug 12, the spring sleeve 4 is integrally formed with the clamping block 5, the clamping block 5 can pass through the through hole of the rubber plug 12, and the installation and fixation of the rubber plug 12 are facilitated. The inner diameter of the through hole of the rubber plug 12 is greater than the outer diameter of the needle sleeve 7, and when the spring 11 rebounds to upwardly eject the spring sleeve 4 and the needle sleeve 7 clamped on the spring sleeve 4, the needle sleeve 7 can more smoothly pass through the through hole of the rubber plug 12 and is pulled into the syringe barrel 1 together with the needle tube 9.

[0036] The top of the piston rod 2 is fixedly connected with a pressing plate 14, the outer diameter of the pressing plate 14 is greater than the outer diameter of the piston rod 2, and the pressing plate 14 facilitates the operation of the piston rod 2 by medical staff.

[0037] The outer surface of the needle seat 6 is sleeved with a protective sleeve 13, and the needle tube 9 is located in the protective sleeve 13. The protective sleeve 13 provides a protection space for the needle tube 9, and can effectively prevent the needle tube 9 from being polluted by dust, bacteria and other pollutants during transportation, storage and use.

[0038] Working principle: during injection, the piston rod 2 is pushed, the medicine liquid can smoothly pass through the space in the syringe barrel 1, the plurality of clamping claws 8 and the needle sleeve 7 under the pushing of the piston rod 2, and finally is injected into the patient's body through the needle tube 9. After the injection of the medicine liquid is completed, the syringe is in the injection zero position (as shown in Figure 2 , the clamping block 5 is completely clamped between the plurality of clamping claws 8;

[0039] Then the syringe is taken off from the patient's body, and the piston rod 2 is continuously pushed downward, the clamping point in the piston rod 2 passes over the top of the spring sleeve 4, the piston rod 2 and the spring sleeve 4 are in the unclamped state, the spring sleeve 4 is released, the spring 11 rapidly releases energy at this moment, the spring 11 upwardly ejects the spring sleeve 4 and the needle sleeve 7 clamped on the spring sleeve 4, the needle sleeve 7 and the needle tube 9 are pulled into the syringe barrel 1 (as shown in Figure 3 ), and the syringe is physically destroyed, and the self-destruction process is completed.

[0040] It should be noted that the terms "comprising", "including", or any other variant thereof are intended to cover non-exclusive inclusion, so that processes, methods, articles or equipment including a series of elements not only include those elements, but also include other elements not explicitly listed, or inherent to such processes, methods, articles or equipment.

[0041] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A retractable self-destructing syringe, comprising a syringe barrel (1), characterized in that: A piston rod (2) is movably inserted into the inside of the syringe (1), a retaining ring (3) is snapped into the inside of the piston rod (2), a spring sleeve (4) is snapped into the inside of the retaining ring (3), and a retaining block (5) is provided at the bottom of the spring sleeve (4); The bottom of the injection cylinder (1) is threaded with a needle seat (6), and a needle assembly (7) is inserted into the needle seat (6). The top of the needle assembly (7) is fixedly connected with multiple claws (8) at equal intervals around the circumference, and the top of the claws (8) is inclined inward. The locking block (5) corresponds to the claws (8).

2. The retractable self-destructing syringe according to claim 1, characterized in that: The shape of the locking block (5) is frustum-shaped, and the outer diameter of the locking block (5) gradually decreases in the direction away from the piston rod (2).

3. The retractable self-destructing syringe according to claim 1, characterized in that: A locking space is formed between the multiple claws (8), and the locking block (5) is engaged in the locking space.

4. The retractable self-destructing syringe according to claim 3, characterized in that: The needle assembly (7) has a needle tube (9) embedded in its middle, and the top of the needle tube (9) is connected to the locking space.

5. The retractable self-destructing syringe according to claim 1, characterized in that: A sealing ring (10) is provided at the connection between the syringe (1) and the needle holder (6), and the sealing ring (10) is sleeved on the outer surface of the needle assembly (7).

6. The retractable self-destructing syringe according to claim 1, characterized in that: A spring (11) is provided between the spring sleeve (4) and the piston rod (2). The top of the spring (11) abuts against the spring sleeve (4), and the bottom of the spring (11) abuts against the top of the retaining ring (3).

7. The retractable self-destructing syringe according to claim 1, characterized in that: The outer surface of the retaining ring (3) is fitted with a rubber plug (12), and the middle part of the rubber plug (12) is provided with a through hole for the retaining block (5) to pass through. The retaining block (5) is located at the bottom of the rubber plug (12).

8. The retractable self-destructing syringe according to claim 7, characterized in that: The outer diameter of the bottom cylinder of the spring sleeve (4) is the same as the inner diameter of the through hole on the rubber plug (12). The maximum outer diameter of the locking block (5) is smaller than the inner diameter of the through hole on the rubber plug (12). The spring sleeve (4) and the locking block (5) are integrally formed. The inner diameter of the through hole on the rubber plug (12) is larger than the outer diameter of the needle assembly (7).

9. The retractable self-destructing syringe according to claim 1, characterized in that: A pressure plate (14) is fixedly connected to the top of the piston rod (2), and the outer diameter of the pressure plate (14) is larger than the outer diameter of the piston rod (2).

10. The retractable self-destructing syringe according to claim 4, characterized in that: The outer surface of the needle holder (6) is covered with a protective sleeve (13), and the needle tube (9) is located inside the protective sleeve (13).

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