CN104436381B - Self-destructive syringe - Google Patents

Abstract

The present invention provides a self-destructing syringe, comprising a cylinder body 1, an injection port 2 is provided at one end of the cylinder body 1, and a push tube 3 is provided at the other end, and a push tube 3 is inserted into the cylinder body 1 at one end provided with a Piston 6, the piston 6 is provided with a vent hole 7, the vent hole 7 is covered by one end of the rubber plug 4, the rubber plug 4 is relatively fixed to the piston 6 through the fixing part 5, and the fixing part 5 wraps The piston 6 is also provided with a space for the piston 6 to move. The maximum diameter of the cross section of the rubber stopper 4 is less than or equal to the diameter of the injection port 2, and the friction between the rubber stopper 4 and the injection port 2 is greater than that between the rubber stopper 4 and the fixed Friction force between pieces 5. The invention has a simple structure, and through the design of adding a detachable rubber stopper on the piston, the syringe will self-destruct after being used once due to loss of sealing. It is convenient for medical personnel to use, avoids the repeated use of disposable syringes, and has low cost, simple structure and convenient use.

Description

self-destructing syringe

technical field

The invention relates to a medical device, especially a self-destructing syringe after use.

Background technique

Disposable syringes currently on the market need to be destroyed after use. If there are low-cost self-destructing syringes, the burden of medical supplies disposal can be greatly reduced.

Contents of the invention

In order to solve the above technical problems, a self-destructing syringe with simple structure, low cost and self-destruction after use is provided. The present invention is solved by the following technical solutions:

The present invention comprises a cylinder body 1, one end of the cylinder body 1 is provided with an injection port 2, and the other end is provided with a push tube 3, and one end of the push tube 3 inserted into the cylinder body 1 is provided with a piston 6, and the piston 6 is There is a vent hole 7, the vent hole 7 is covered by one end of the rubber plug 4, the rubber plug 4 is relatively fixed to the piston 6 through the fixing part 5, the fixing part 5 wraps the piston 6 and is provided with the piston 6 to move The maximum diameter of the cross section of the rubber stopper 4 is less than or equal to the diameter of the injection port 2, and the friction force between the rubber stopper 4 and the injection port 2 is greater than the friction force between the rubber stopper 4 and the fixing member 5.

When the present invention is used, the user normally inhales the liquid medicine like a normal disposable syringe. During the process of pushing the liquid medicine forward, the rubber stopper 4 protrudes due to the hydraulic pressure. When the liquid medicine is pushed out, the rubber stopper 4 just snaps in. Injection port 2, in the process of pulling back the piston 6, the rubber plug 4 is separated from the piston 6, and the piston 6 loses its sealing performance and cannot be used again.

The invention has a simple structure, and through the design of adding a detachable rubber stopper on the piston, the syringe will self-destruct after being used once due to loss of sealing. It is convenient for medical personnel to use, avoids the repeated use of disposable syringes, and has low cost, simple structure and convenient use.

Description of drawings

Fig. 1 is a schematic diagram of the disassembled state structure of the self-destructing syringe in Example 1 of the present invention;

Fig. 2 is a sectional view of the self-destruct syringe in Embodiment 1 of the present invention;

Fig. 3 is a schematic diagram of the state of Fig. 1 after inhaling the liquid medicine;

Fig. 4 is a schematic diagram of the state of Fig. 1 when pushing the liquid medicine;

Fig. 5 is a schematic diagram of the state of Fig. 1 after the potion is pushed out;

Fig. 6 is a schematic diagram of the state of Fig. 1 after the push tube is withdrawn and the piston loses its tightness.

detailed description

Refer to attached picture. The invention comprises: cylinder body 1, injection port 2, push tube 3, rubber stopper 4, fixing part 5, piston 6, vent hole 7, undercut 8.

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

As shown in Figure 1, the present invention includes a cylinder body 1, one end of the cylinder body 1 is provided with an injection port 2, and the other end is provided with a push tube 3, and one end of the push tube 3 inserted into the cylinder body 1 is provided with a piston 6 , the piston 6 is provided with a vent hole 7, the vent hole 7 is covered by one end of the rubber plug 4, the rubber plug 4 is relatively fixed to the piston 6 through the fixing part 5, and the fixing part 5 wraps the piston 6 And there is a space for the piston 6 to move. The maximum diameter of the cross section of the rubber stopper 4 is less than or equal to the diameter of the injection port 2, and the friction between the rubber stopper 4 and the injection port 2 is greater than that between the rubber stopper 4 and the fixing member 5. the friction between them.

After the rubber stopper 4 is inserted into the injection port 2, there is still a gap for liquid medicine to flow out between the rubber stopper 4 and the injection port 2.

The moving distance of the piston 6 in the fixed part 5 is less than or equal to the length of the rubber stopper 4 .

The fixing part 5 is provided with an undercut 8 buckled on the piston 6, so that when the piston 6 is pulled backward, the fixing part 5 is driven to move backward. The fixing part 5 is provided with a hole, and the rubber plug 4 is plugged in the hole, so that the fixing part 5 drives the rubber plug 4 to move backward together. When the piston 6 is pushed forward, the piston 6 moves in the space inside the fixing part 5 and pushes the rubber plug 4 out.

As shown in Figure 3, when the present invention is used, the user installs the needle (the needle is omitted in the figure), pulls the push tube 3 to inhale the liquid medicine backward, and the push tube 3 drives the piston 6 backward, because the piston 6 passes through the fixing part 5 It is relatively fixed with the rubber stopper 4, so when the piston 6 moves backwards, it drives the fixing part 5 and the rubber stopper 4 to move backwards, which facilitates the inhalation of liquid medicine, and at the same time, the rubber stopper 4 blocks the air hole 7 firmly.

As shown in Figure 4, after inhaling enough liquid medicine, the user can start the injection. When giving an injection, push the push tube 3 forward, thereby pushing the piston 6 forward, and when the piston 6 pushes forward against the rubber stopper 4, the piston 6 also moves in the fixing part 5, thereby pushing the rubber stopper 4 out of the fixing part 5 Push it out.

As shown in FIG. 5 , the user continues to inject and pushes the push tube 3 forward so that the piston 6 presses against the rubber stopper 4 and moves forward until the rubber stopper 4 is inserted into the injection port 2 . Because after the rubber stopper 4 is inserted into the injection port 2, there is still a gap between the rubber stopper 4 and the injection port 2 where the liquid medicine flows out, so the piston 6 can be pushed to the bottom of the cylinder body 1, and the liquid medicine can be used completely.

As shown in Figure 6, the user pulls out the needle, pulls the push tube 3 backward, and the push tube 3 drives the piston 6 backward, because the rubber stopper 4 has been inserted into the injection port 2, and the friction between the rubber stopper 4 and the injection port 2 It is greater than the friction force between the rubber stopper 4 and the fixing part 5, so when the piston 6 moves backward, the rubber stopper 4 is left in the injection port 2, so that it cannot continue to cover the vent hole 7, so that the piston 6 actually fails.

The needles are not shown in the accompanying drawings of the present invention, and the user can put them on when using them.

In a word, the above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the patent of the present invention.

Claims (3)

1. A self-destructing syringe, characterized in that: the syringe includes a barrel (1), one end of the barrel (1) is provided with an injection port (2), and the other end is provided with a push tube (3). One end of the push tube (3) inserted into the barrel (1) is provided with a piston (6), and the piston (6) is provided with a vent hole (7), and the vent hole (7) is covered by the rubber plug (4) One end is covered, and the rubber plug (4) is relatively fixed to the piston (6) through the fixing piece (5). The fixing piece (5) wraps the piston (6) and has a movable space for the piston (6). The maximum diameter of the cross-section of the rubber plug (4) is less than or equal to the diameter of the injection port (2), and the friction between the rubber plug (4) and the injection port (2) is greater than that of the rubber plug (4) and the fixing piece ( 5) Friction between. 2. The self-destructing syringe according to claim 1, characterized in that: after the rubber stopper (4) is inserted into the injection port (2), there is a gap between the rubber stopper (4) and the injection port (2). There is a gap where the medicine flows out. 3. The self-destructing syringe according to claim 1 or 2, characterized in that: the moving distance of the piston (6) in the fixing part (5) is less than or equal to the length of the rubber stopper (4).