Novel combined type safe self-destruction syringe

Abstract

The utility model discloses a novel combined type safety self-destruction syringe which comprises a syringe, a needle seat, a sealing rubber plug and an injection rod, a sealing ring is arranged in the syringe in a sliding mode, the rear end of the needle seat makes contact with the sealing ring for limiting through a through hole, and a spring sleeve is connected between the sealing rubber plug and the injection rod. The outer side walls of the two ends of the spring sleeve are clamped with the sealing rubber plug and the injection rod respectively, a clamping head is arranged on the end face of the end, close to the sealing rubber plug, of the spring sleeve, and a rear cover is movably connected to the end, away from the spring sleeve, of the injection rod. The utility model belongs to the technical field of syringes, and particularly relates to a position structure which is used for triggering a self-destruction function by mistake and changing the self-destruction function when liquid medicine is repeatedly pushed to a zero position by an injector, so that the self-destruction function cannot be triggered when an injection rod is pushed to the zero position, and the liquid medicine can be repeatedly pushed to the zero position for use. The utility model discloses a novel combined type safe self-destruction syringe which can reduce residual liquid medicine in a syringe tube.

Description

Technical Field

[0001] The utility model belongs to the technical field of syringes, and particularly relates to a novel composite safety self-destructing syringe. Background Art

[0002] With the wide application of syringes, in order to avoid cross-infection of medical patients, more and more self-destructing syringes appear on the market. A self-destructing syringe is a disposable syringe product that can prevent reuse after use. There are various types. After injection, relying on manual or mechanical force, the push rod cannot be withdrawn from the syringe barrel to achieve self-locking, or the sealing performance of the piston is damaged, or the push rod of the syringe can be inferred, ultimately achieving the purpose of preventing reuse.

[0003] At present, there are various retractable self-destructing syringes on the market, which can retract the needle tube into the syringe after injection to achieve the self-destructing function. However, the safety performance of this type of retractable self-destructing syringe restricts the wide promotion of this product.

[0004] When using a syringe, the user usually needs to draw the liquid medicine multiple times for medicine preparation. Because it is necessary to ensure that the air in the syringe is completely discharged, the injection rod must be pushed to the zero position of the syringe. This operation is prone to safety problems. When the injection rod is pushed to the zero position, the self-destructing function of the syringe is triggered, resulting in the syringe being unusable. On the other hand, when the user uses this type of syringe to inject medicine into a patient, it is also easy to operate incorrectly, and the self-destructing function of the syringe is triggered during the injection process, resulting in the needle tube being accidentally pulled out directly in the patient's body, which may cause a medical accident. Content of the Utility Model

[0005] The technical problem to be solved by the utility model is to change the position structure of the self-destructing function, so that the self-destructing function will not be triggered when the injection rod is pushed to the zero position, and it can be repeatedly pushed to the zero position for use, reducing the residual liquid medicine inside the syringe barrel.

[0006] To solve the above technical problems, the technical solution adopted by the utility model is as follows: a novel composite safety self-destructing syringe, including a syringe barrel, a needle seat, a sealing rubber plug and an injection rod. The needle seat is slidably arranged inside the syringe barrel and is movably connected to the injection end of the syringe barrel along the length direction of the syringe barrel. The sealing rubber plug is slidably arranged inside the syringe barrel by the advancement of the injection rod. The sealing rubber plug is movably connected to the feeding end of the injection rod. A sealing ring is slidably arranged inside the syringe barrel. The rear end of the needle seat is in contact and limited with the sealing ring through a through hole. A spring sleeve is connected between the sealing rubber plug and the injection rod. The outer side walls of both ends of the spring sleeve are respectively clamped and connected to the sealing rubber plug and the injection rod. A clamping head is arranged on the end face of the spring sleeve close to the sealing rubber plug. The end of the injection rod far from the spring sleeve is movably connected with a rear cover.

[0007] Further, a fixing groove is formed in the inner side wall of the syringe barrel near one end of the needle seat. First ribs are fixedly connected to both sides of the fixing groove, and the first ribs are symmetrically arranged up and down with the fixing groove as the center; second ribs are arranged on the outer side wall of the sealing ring, and the second ribs are clamped in the fixing groove; the through hole is arranged on the end face of the sealing ring and is inclined and enlarged towards the end close to the needle seat, and a buffer cavity is formed in the middle of the through hole.

[0008] Further, a first clamping block is fixedly connected to the outer side wall of the spring sleeve away from the clamping joint; a second clamping block is fixedly connected to the inner side wall of the injection rod close to the spring sleeve, and the second clamping blocks are arranged in a uniformly spaced annular arrangement; the clamping joint is arranged in a tapered diamond shape.

[0009] Further, the side wall of the buffer cavity is inclined in the opposite direction to the side wall of the through hole, and the end face of the sealing ring away from the needle seat is provided with an inclined surface concave in the center.

[0010] Further, a clamping groove is formed in the middle of the inner side wall of the sealing rubber plug, and the sealing rubber plug is connected to the feeding end of the injection rod through the clamping groove. A widening groove is formed in the inner side wall of the sealing rubber plug close to the clamping joint, and the widening groove is adjacent to the clamping groove. Fourth ribs are arranged on the outer side wall of the sealing rubber plug.

[0011] Further, a support spring is wound around the outer side wall of the spring sleeve, and the support spring is limited and compressed between the inner end face of the feeding end of the injection rod and the first clamping block through the second clamping block.

[0012] Further, a clamping groove is formed at the bottom end of the needle seat. The outer side wall of the needle seat near the clamping groove is provided with an outwardly convex inclined surface, which matches the inclined surface of the inner side wall of the through hole. A first step is formed on the end face of the outwardly convex inclined surface of the needle seat.

[0013] Further, third ribs are arranged on the inner side wall of the rear cover, and the third ribs are in clamping contact with the outer side wall of the spring sleeve through the second clamping block.

[0014] Further, the injection rod is provided with a cavity, and a ventilation hole is formed in the side wall of the injection rod close to the rear cover.

[0015] After adopting the above structure, the beneficial effects of the present utility model are as follows: aiming at the problem that the syringe accidentally triggers the self-destruction function when repeatedly pushing the liquid medicine to the zero position;

[0016] (1) The limiting sealing ring: first ribs are added on both sides of the sealing ring to improve the limiting effect of the sealing ring, and at the same time increase the limiting effect on the needle seat, support the sealing rubber plug to fit with the sealing ring, and realize the repeated pushing of the liquid medicine;

[0017] (2) When the injection rod is pushed to move, the widened groove inside the sealing rubber plug increases the elastic space, making it easier for the sealing rubber plug to push the liquid medicine to the injection zero position, reducing the residue of the liquid medicine in the syringe barrel; at the same time, through the inclined surface contact and cooperation between the sealing ring and the needle seat, the function of preventing liquid leakage under negative pressure is achieved, and no liquid leakage occurs when positive pressure is generated in the syringe barrel;

[0018] (3) The self-destruction function is activated by inserting the diamond-shaped tapered card joint into the card slot of the needle seat. When the self-destruction function is activated, the friction force for locking the card joint into the card slot is reduced, and when pulling back, the friction locking force between the card joint and the card slot is increased, making it not easy to fall off;

[0019] (4) By adding rib three on the inner wall of the rear cover, after the self-destruction function is activated, the needle seat retracts to the position of rib three of the rear cover, and the first card block is slidably clamped through rib three, and the retracted needle is positioned inside the injection rod, realizing that the needle does not protrude, avoiding secondary injury. Description of the Drawings

[0020] The drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation to the present invention.

[0021] Figure 1 It is a half-sectional view of a new type of composite safety self-destruction syringe proposed by the present invention;

[0022] Figure 2 It is a schematic structural diagram of the syringe barrel of a new type of composite safety self-destruction syringe proposed by the present invention;

[0023] Figure 3 It is Figure 2 The enlarged view of part A;

[0024] Figure 4 It is a schematic structural diagram of the spring sleeve of a new type of composite safety self-destruction syringe proposed by the present invention;

[0025] Figure 5 It is Figure 4 The enlarged view of part A;

[0026] Figure 6 It is a half-sectional view of the sealing ring of a new type of composite safety self-destruction syringe proposed by the present invention;

[0027] Figure 7 It is a half-sectional view of the needle seat of a new type of composite safety self-destruction syringe proposed by the present invention;

[0028] Figure 8 It is a half-sectional view of the sealing rubber plug of a new type of composite safety self-destruction syringe proposed by the present invention;

[0029] Figure 9 Schematic diagram of the connection between the needle seat and the sealing ring of a new type of composite safety self-destructing syringe proposed by the present utility model;

[0030] Figure 10 Schematic diagram of the initial self-destruction state of a new type of composite safety self-destructing syringe proposed by the present utility model;

[0031] Figure 11 Diagram of the contracted state of the needle seat after the self-destruction of a new type of composite safety self-destructing syringe proposed by the present utility model;

[0032] Figure 12 is Figure 11 Enlarged view of part C of

[0033] In the attached drawings: 1, syringe barrel; 2, needle seat; 3, sealing rubber plug; 4, injection rod; 5, sealing ring; 6, spring sleeve; 7, through hole; 8, clamping joint; 9, rear cover; 10, fixing groove; 11, first rib; 12, second rib; 13, buffer cavity; 14, first clamping block; 15, second clamping block; 16, clamping groove; 17, broadening groove; 18, fourth rib; 19, support spring; 20, card slot; 21, first step; 22, third rib; 23, air vent. Detailed implementation manners

[0034] As Figure 1 , Figure 2 , Figure 4 , Figure 5 and Figure 10 shown, a new type of composite safety self-destructing syringe includes a syringe barrel 1, a needle seat 2, a sealing rubber plug 3 and an injection rod 4. The needle seat 2 is slidably arranged in the syringe barrel 1 and is movably connected to the injection end of the syringe barrel 1 along the length direction of the syringe barrel 1. The sealing rubber plug 3 is slidably arranged in the syringe barrel 1 through the advancement of the injection rod 4. The sealing rubber plug 3 is movably connected to the feeding end of the injection rod 4. A sealing ring 5 is slidably arranged inside the syringe barrel 1. The rear end of the needle seat 2 is in contact with and limited by the sealing ring 5 through the through hole 7. A spring sleeve 6 is connected between the sealing rubber plug 3 and the injection rod 4. The outer side walls at both ends of the spring sleeve 6 are respectively clamped and connected to the sealing rubber plug 3 and the injection rod 4. A clamping joint 8 is arranged on the end face of the spring sleeve 6 close to the sealing rubber plug 3. The end of the injection rod 4 far from the spring sleeve 6 is movably connected to a rear cover 9. When the injection rod 4 drives the sealing rubber plug 3 to repeatedly inject liquid in the syringe barrel 1, the sealing ring 5 is in contact with the end face of the sealing rubber plug 3, pushing the liquid medicine to the zero position, and at the same time limiting the position of the spring sleeve 6, and the self-destruction function will not be triggered.

[0035] As Figure 1 , Figure 3 and Figure 6As shown in the figure, in order to achieve repeated liquid injection and improve the positioning effect of the sealing ring 5 inside the syringe 1, a fixing groove 10 is formed on the inner side wall of the syringe 1 near the needle seat 2. On both sides of the fixing groove 10, there are fixedly connected first ribs 11, and the first ribs 11 are symmetrically arranged up and down with the fixing groove 10 as the center. On the outer side wall of the sealing ring 5, there are second ribs 12, and the second ribs 12 are clamped in the fixing groove 10. When the second ribs 12 are clamped in the fixing groove 10, the first ribs 11 on both sides limit the second ribs 12, so that the sealing ring 5 fits tightly with the inner wall of the syringe 1 without displacement.

[0036] As Figure 1 , Figures 6 - 9 shown in the figure, in order to improve the fitting degree between the needle seat 2 and the sealing ring 5 and avoid liquid leakage at the connection between the needle seat 2 and the sealing ring 5 during liquid injection, a through hole 7 is provided on the end face of the sealing ring 5 and is arranged as an inclined enlarged hole towards the end near the needle seat 2. The outer side wall of the needle seat 2 near one end of the card slot 20 is arranged as an outward convex inclined surface, which matches the inclined surface of the inner side wall of the through hole 7. The end face of the outward convex inclined surface of the needle seat 2 forms a first step 21. The side wall of the through hole 7 has an inclination, which cooperates with the inclination of the bottom of the needle seat 2 to play a role in preventing negative pressure liquid leakage. When the injection rod 4 is pushed, positive pressure is generated inside the barrel and no liquid leaks;

[0037] In order to reduce the residual amount of the liquid medicine in the syringe 1 during liquid injection, a clamping groove 16 is formed in the middle of the inner side wall of the sealing rubber plug 3. The sealing rubber plug 3 is connected to the feeding end of the injection rod 4 through the clamping groove 16. A widening groove 17 is formed in the inner side wall of the sealing rubber plug 3 near one end of the clamping head 8, and the widening groove 17 is adjacent to the clamping groove 16. The outer side wall of the sealing rubber plug 3 is provided with fourth ribs 18. By widening the inner diameter of the sealing rubber plug 3, the elastic space of the sealing rubber plug 3 is increased, making it easier to push the sealing rubber plug 3 to the injection zero position.

[0038] As Figures 10 - 12As shown in the figure, in order to control the self-destruction function, a first catch block 14 is fixedly connected to the outer side wall of the end of the spring sleeve 6 away from the catch joint 8. A second catch block 15 is fixedly connected to the inner side wall of the end of the injection rod 4 close to the spring sleeve 6. The second catch blocks 15 are arranged in a uniformly spaced circular pattern. A support spring 19 is wound around the outer side wall of the spring sleeve 6. A buffer cavity 13 is formed in the middle of the through hole 7. The side wall of the buffer cavity 13 is inclined in the opposite direction to the side wall of the through hole 7. The end face of the sealing ring 5 away from the needle base 2 is provided with an inclined surface that is concave in the center. The catch joint 8 is provided in a tapered diamond shape. The support spring 19 is limited and compressed between the inner end face of the feed end of the injection rod 4 and the first catch block 14 through the second catch block 15. In the state of repeated liquid injection, the first catch block 14 at the bottom of the spring sleeve 6 is limited at the front end of the injection rod 4 through the second catch block 15, and at the same time, the support spring 19 is compressed and limited. When the sealing ring 5 is in contact with the sealing rubber plug 3, the catch joint 8 is located in the buffer cavity 13 and does not contact the needle base 2. When the self-destruction function is activated, the injection rod 4 is pushed forward, and the catch joint 8 is inserted into the bottom slot 20 of the needle base 2 for clamping, so that the spring sleeve 6 is connected to the needle base 2. The injection rod 4 is continuously pushed forward, so that the spring sleeve 6 is disengaged from the clamping of the second catch block 15, and the sealing ring 5 and the sealing rubber plug 3 are fixed to the inner wall of the injection end of the syringe barrel 1. The spring sleeve 6 is pushed into the cavity of the injection rod 4 by the elastic force of the support spring 19 and the air pressure, so as to realize the retraction of the needle base 2;

[0039] In order to fix the retracted needle base 2, a third rib 22 is provided on the inner side wall of the rear cover 9. The third rib 22 is in clamping contact with the outer side wall of the spring sleeve 6 through the second catch block 15. The injection rod 4 is provided with a cavity. A ventilation hole 23 is opened on the side wall of the injection rod 4 close to the rear cover 9. The support spring 19 pushes the spring sleeve 6 towards the rear cover 9 in the cavity of the injection rod 4. The first catch block 14 of the spring sleeve 6 is in sliding clamping connection with the third rib 22 to fix the needle base 2, ensuring that the needle tip will not fall back and expose the injection rod 4. The ventilation hole 23 facilitates the rebound of the needle tip.

[0040] During specific use, when an operator needs to use a syringe for drug preparation, the injection rod 4 is pushed to the zero position state, and the end faces of the sealing ring 5 and the sealing rubber plug 3 are in contact. At this time, the catch joint 8 of the spring sleeve 6 is located in the buffer cavity 13 and will not be clamped with the slot 20 on the needle base 2, avoiding triggering the self-destruction function and realizing safe drug preparation;

[0041] When the drug preparation is completed and the drug needs to be injected into the patient's body, as Figure 10 shown, the injection rod 4 is pushed to the starting state. The catch joint 8 of the spring sleeve 6 is located in the buffer cavity 13 and will not be clamped with the slot 20 on the needle base 2, and will not trigger the self-destruction function, ensuring the safety during injection and avoiding medical accidents;

[0042] When the syringe is pulled out of the human body after the injection is completed, the self-destruction of the syringe needs to be realized, as Figure 11As shown, the injection rod 4 is continuously pushed towards the injection end of the syringe barrel 1. The end of the injection rod 4 presses against the sealing ring 5, causing the second ribs 12 on both sides of the sealing ring 5 to disengage from the clamping of the fixing groove 10 and move towards the injection end of the syringe barrel 1 along with the injection rod 4. The compressed air generated by the gap between the sealing ring 5 and the syringe barrel 1 pushes against the first step surface, and the upward elastic stress of the needle seat 2 becomes increasingly large until the clamping head 8 passes through the buffer cavity 13 and is clamped in the clamping groove 20. Continuing to push the injection rod 4 downward causes the end of the spring sleeve 6 to disengage from the clamping of the second clamping block 15. The sealing ring 5 and the sealing rubber plug 3 are respectively limited at the injection end of the syringe barrel 1 by the second ribs 12 on the outer side wall and the fourth ribs 18 and will not return.

[0043] Under the supporting action of the supporting spring 19, as Figure 11 shown, the elastic stress of the spring sleeve 6 plus the elastic stress of the compressed air on the needle seat 2 causes the spring sleeve 6 and the needle seat 2 to bounce into the cavity of the injection rod 4 together. After the supporting spring 19 extends, it can press against the top end of the spring sleeve 6 in the cavity of the injection rod 4, thus ensuring that the needle tip will not fall back and expose the injection rod 4. Since the injection rod 4 is provided with a vent hole 23, it is more convenient for the needle tip to bounce back.

[0044] Through the composite syringe assembly structure of the present application, when an operator operates the syringe to implement injection and self-destruction, there can be obvious stage divisions, and there is clear operation feedback in each stage, which can ensure the safety of implementing injection and realize the reliability of self-destruction.

[0045] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. In summary, if those of ordinary skill in the art are inspired by it and, without departing from the purpose of the present invention, design similar structural methods and embodiments without creative efforts, they shall fall within the protection scope of the present invention.

Claims

1. A novel composite safety self-destructing syringe, comprising a syringe barrel, a needle seat, a sealing rubber stopper and a plunger rod. The needle seat is slidably disposed in the syringe barrel and is movably connected to the injection end of the syringe barrel along the length direction of the syringe barrel. The sealing rubber stopper is slidably disposed in the syringe barrel by the advancement of the plunger rod, and the sealing rubber stopper is movably connected to the feeding end of the plunger rod. It is characterized in that: A sealing ring is slidably arranged inside the syringe barrel. The rear end of the needle base is in contact and limited with the sealing ring through a through hole. A spring sleeve is connected between the sealing rubber plug and the injection rod. The outer side walls of both ends of the spring sleeve are respectively clamped and connected with the sealing rubber plug and the injection rod. A clamping head is arranged on the end face of the spring sleeve close to the sealing rubber plug. The end of the injection rod away from the spring sleeve is movably connected with a rear cover.

2. The novel composite safety self-destructing syringe according to claim 1, wherein: A fixing groove is formed on the inner side wall of the syringe barrel near the needle base. Two first ribs are fixedly connected to both sides of the fixing groove. The first ribs are symmetrically arranged up and down with the fixing groove as the center. A second rib is arranged on the outer side wall of the sealing ring. The second rib is clamped in the fixing groove. The through hole is arranged on the end face of the sealing ring and is an inclined enlarged hole towards the end close to the needle base. A buffer cavity is formed in the middle of the through hole.

3. A novel composite safety self-destructing syringe according to claim 1, characterized in that: A first clamping block is fixedly connected to the outer side wall of the spring sleeve away from the clamping head. A second clamping block is fixedly connected to the inner side wall of the injection rod near the spring sleeve. The second clamping blocks are arranged in a uniformly spaced annular manner. The clamping head is in a tapered diamond shape.

4. A novel composite safety self-destructing syringe according to claim 2, characterized in that: The side wall of the buffer cavity is arranged in an inclined direction opposite to the side wall of the through hole. The end face of the sealing ring away from the needle base is an inclined surface with a concave center.

5. A novel composite safety self-destructing syringe according to claim 1, characterized in that: A clamping groove is formed in the middle of the inner side wall of the sealing rubber plug. The sealing rubber plug is connected to the feeding end of the injection rod through the clamping groove. A widened groove is formed in the inner side wall of the sealing rubber plug near the clamping head. The widened groove is adjacent to the clamping groove. A fourth rib is arranged on the outer side wall of the sealing rubber plug.

6. A novel composite safety self-destructing syringe according to claim 1 or 3, characterized in that: A support spring is wound around the outer side wall of the spring sleeve. The support spring is limited and compressed between the inner end face of the feeding end of the injection rod and the first clamping block through the second clamping block.

7. A novel composite safety self-destructing syringe according to claim 1, characterized in that: A clamping groove is formed at the bottom end of the needle base. The outer side wall of the needle base near the clamping groove is an outwardly convex inclined surface, which matches the inclined surface of the inner side wall of the through hole. A first step is formed on the end face of the outwardly convex inclined surface of the needle base.

8. A novel composite safety self-destructing syringe according to claim 1, characterized in that: A third rib is arranged on the inner side wall of the rear cover. The third rib is in clamping contact with the outer side wall of the spring sleeve through the second clamping block.

9. A novel composite safety self-destructing syringe according to claim 1, characterized in that: The injection rod is provided with a cavity. An air vent is formed on the side wall of the injection rod near the rear cover.

Images