CN2535066Y

CN2535066Y - Improved unidirectional syringe

Info

Publication number: CN2535066Y
Application number: CN 01250334
Authority: CN
Inventors: 李成
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-08-08
Filing date: 2001-08-08
Publication date: 2003-02-12
Anticipated expiration: 2011-08-08

Abstract

The utility model provides a unilateral syringe, which consists of a needle cylinder, a plunger and a pusher. The utility model is characterized in that the pusher consists of two link rods which are joggled together through inner and outer teeth in the axial direction. The teeth on the inner link rod tend towards the end of the inner link rod; and the teeth on the outer link rod tend towards the front end of the outer link rod. After the inner link rod and the outer link rod come together, the length of the combined inner link rod and the outer link rod together with the plunger is less than or equal to the length of the inner chamber of the needle cylinder. The utility model has the advantages of simple structure, low cost and usableness, and that the utility model eliminates the problem that disposable syringes are reused by the root.

Description

A kind of improved unipolarity syringe

Technical field

This utility model relates to syringe, especially a kind of improved disposable one-way syringe.

Background technology

Widely used in the market disposable syringe is owing to adopt overall plastic material to make, and its structure is identical with conventional syringe, is therefore often reclaimed by illegal retailer, comes into operation once more, very easily causes cross infection, so just makes disposable syringe lose meaning.

Summary of the invention

The purpose of this utility model is in order to solve the deficiency that the above-mentioned background technology exists, to propose a kind of disposable improved unipolarity syringe of not reproducible reuse.

For achieving the above object, this utility model adopts the structure of being made up of syringe, piston and push rod, its special character is that described push rod is made of inside and outside two joint connecting rods, this two joints connecting rod is meshing with each other together by interior external tooth vertically, profile of tooth direction on the described inside connecting rod is towards the tail end of inside connecting rod, profile of tooth direction on the outside connecting rod is towards the front end of outside connecting rod, and interior outside connecting rod closes up the back with the length of the piston length smaller or equal to the syringe inner chamber.

Furtherly, the front end of described outside connecting rod links to each other with piston, the inside connecting rod front end edge circumferentially is evenly equipped with the toothed cantilever of outer surface, and described outside connecting rod afterbody and inside connecting rod front end cantilever corresponding position are extended with the toothed cantilever of inner surface, and the tooth of above-mentioned two cantilever surfaces externally and internallies is meshing with each other.

Furtherly, there is retaining wall affiliated outside connecting rod cantilever side.

This syringe has two strokes in use: one is the stroke that extracts medicine, piston moves backward, after being drawn into the doses medicinal liquid, promptly stop to take out medicine, begin next stroke then---injection, piston forward moves, at this moment the contraction in length of push rod, when piston is shifted top (end) portion of syringe onto, the inside connecting rod end syringe intracavity that submerges fully just in the push rod, and the slit is very little between them, it can't be extracted out.Avoided reusing of syringe fully.Therefore, the utlity model has disposable function truly, it can allow user more relieved, more safely use, fundamentally stopped reusing of disposable syringe.This utility model also has advantage simple in structure, with low cost, easy to use simultaneously.

Below in conjunction with the accompanying drawing illustrated embodiment, describe this utility model in detail, but protection domain of the present utility model is not limited to by this.

Description of drawings

Fig. 1 is this syringe construction sketch map.

Fig. 2 is that push rod draws back state diagram.

Fig. 3 is that push rod closes up state diagram.

Fig. 4 is the inside connecting rod front view.

Fig. 5 is the right view of Fig. 4.

Fig. 6 is the outside connecting rod front view.

Fig. 7 is the left view of Fig. 6.

The specific embodiment

This utility model adopts the structure of being made up of syringe 1, piston 2 and push rod 3, wherein, described push rod is made of inside and outside two joint connecting rods, the front end of outside connecting rod 3-1 links to each other with piston 2, inside connecting rod 3-2 front end edge circumferentially is evenly equipped with the cantilever 5 of outer surface belt tooth 4, described outside connecting rod 3-1 afterbody and inside connecting rod 3-2 front end cantilever 5 corresponding positions are extended with the cantilever 6 of inner surface belt tooth 4, and the tooth 4 of above-mentioned two cantilevers, 5,6 surfaces externally and internallies is meshing with each other.Profile of tooth direction on the described inside connecting rod is towards the tail end of inside connecting rod, and the profile of tooth direction on the outside connecting rod has retaining wall 7 towards the front end of outside connecting rod in outside connecting rod cantilever 6 sides, is meshing with each other in order to the tooth 4 that guarantees above-mentioned two cantilevers, 5,6 surfaces externally and internallies, comes off in avoiding using.Outside connecting rod all can adopt plastics to make in of the present utility model.

In sum, this utility model is not only novel but also practical, and the modular design of its innovation but can make this syringe realize disposablely using the purpose of not reproducible reuse.Compare with background technology and to have outstanding feature and progress, creative.

Claims

1, a kind of improved unipolarity syringe, form by syringe, piston and push rod, it is characterized in that described push rod is made of inside and outside two joint connecting rods, this two joints connecting rod is meshing with each other together by interior external tooth vertically, profile of tooth direction on the described inside connecting rod is towards the tail end of inside connecting rod, profile of tooth direction on the outside connecting rod is towards the front end of outside connecting rod, and interior outside connecting rod closes up the back with the length of the piston length smaller or equal to the syringe inner chamber.

2, according to the described a kind of improved unipolarity syringe of claim 1, the front end that it is characterized in that described outside connecting rod links to each other with piston, the inside connecting rod front end edge circumferentially is evenly equipped with the toothed cantilever of outer surface, described outside connecting rod afterbody and inside connecting rod front end cantilever corresponding position are extended with the toothed cantilever of inner surface, and the tooth of above-mentioned two cantilever surfaces externally and internallies is meshing with each other.

3,, it is characterized in that there is retaining wall described outside connecting rod cantilever side according to the described a kind of improved unipolarity syringe of claim 2.