CN2245989Y

CN2245989Y - Expansion self-destroying disposable syringe

Info

Publication number: CN2245989Y
Application number: CN 95224297
Authority: CN
Inventors: 阎傲霜; 丁永华
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-11-02
Filing date: 1995-11-02
Publication date: 1997-01-29
Anticipated expiration: 2005-11-02

Abstract

The utility model relates to an expansion self-destroying disposable syringe belonging to a medical appliance, which solves the problem that a disposable syringe can be reused many times in practice. Apart from a needle head, a needle tube and a push rod with a piston, the utility model is provided with an expansion ring which is arranged in the needle tube and at the end near the needle head and provided with a round hole, and the round hole is communicated with the inner cavity of the needle tube and a hole of the needle head. The expansion ring is expanded when in touch with water, the round hole in the expansion ring disappears for tumescence in a period of time after first use, the partitioned liquor enters a passage of the needle head from the needle tube, and the syringe is destroyed automatically. The utility model can be used in injection, blood sampling, etc.

Description

The expansion re-use preventing once-used syringe

This utility model relates to a kind of self-destructed disposable medical apparatus and instruments of injecting and taking a blood sample of being used to.People are called syringe and hemostix to this series products by purposes in the custom, but its basic structure all is identical with operation principle, so unification is called syringe in present specification.

At present, disposable syringe structurally is the same with traditional nonexpondable syringe substantially, is made up of push rod three parts of syringe needle, needle tubing and band piston.This disposable syringe main body mostly is plastics, purpose is to reuse after using heat disinfection to handle, but any variation does not take place in itself after use, still keep original function, therefore just have the possibility (for example even do not sterilized with oxirane chemical gas fumigation and steaming method or the sterilization of r x ray irradiation x method and just reuse in the cleaning back) that is repeated to use, its ' disposable ' and safety in utilization can not get guaranteeing.

The purpose of this utility model is to provide a kind of disposable syringe that can use back ' oneself damages ', loses function of use after use automatically, guarantees that fundamentally this product can only use once.

Syringe will be realized injection or blood sampling operation, and needle tubing internal cavity and syringe needle hole are communicated with, and liquid flows into needle tubing by syringe needle under pressure or outpours through syringe needle from needle tubing during operation.The syringe needle hole and the syringe intracavity of common disposable syringe directly are communicated with at binding site.One end of this utility model nearly syringe needle in needle tubing adds a self-destruction part with holes, and the self-destruction part clogs the passage of syringe intracavity to the syringe needle hole, and fluid has only by the hole of self-destruction part and could flow between needle tubing and syringe needle.Select suitable material (as some special plastics) to make the self-destruction part, the self-destruction part is when this back, injector package Kaifeng or use, same air, light or contacts such as injection, blood, meeting is dilatancy voluntarily, through certain hour, hole distension in the self-destruction part disappears, and has cut off the passage of liquid from the needle tubing to the syringe needle, and this syringe just can not reuse.

This utility model is with a simple self-destruction part, make the user of service not need to do any extra work, just can realize ' self-destruction ' of disposable syringe, the self-destruction part is difficult to take out from syringe technically, this has just fundamentally eliminated the artificial possibility that illegally re-uses disposable syringe, has guaranteed the security reliability that this series products is applied in practice.

Below, be described with reference to the accompanying drawings specific embodiments of the present utility model and operation principle.

Fig. 1 is sketch map of the present utility model (the syringe needle part is not drawn).

Common disposable syringe is made up of the push rod (2) of needle tubing (1), syringe needle and band piston (3), and cannula body front end face (4) middle part has a protrusion tubule (5) to be connected with syringe needle.During use, outer pulling-pushing rod (2) produces negative pressure in the needle tubing, and liquid flows into syringe intracavity (8) through syringe needle, tubule (5), in push rod, then liquid outpours through tubule (5) and syringe needle from syringe intracavity.This utility model has added an expansion loop (6) as the self-destruction part on said structure, expansion loop places nearly needle end in the needle tubing, its periphery coincide together with needle interior wall, one circular hole (7) is arranged in the middle of the expansion loop, circular hole (7) is communicated with syringe intracavity (8) and tubule (5), and is linked to be a passage through tubule (5) and syringe needle endoporus.During first the use, liquid freely flows in syringe by circular hole (7), this utility model is used as ordinary syringe, but after using once, because expansion loop (6) contact the generation expansion with water in the injection (or blood), through certain hour, circular hole in the expansion loop (7) distension disappears, and has cut off the passage between same tubule of syringe intracavity (8) (5) and the syringe needle, and syringe just can not have been worked again.

Suitably select the material prescription and the working process parameter of expansion loop, the distension time (being the self-destruction time of syringe) that can set in advance circular hole in the expansion loop (7) is a special value (as 5-10 minute), and in rational inject time in (as 2 minutes) expansion loop circular hole (7) do not change substantially.

Needle tubing front end face (4) is a gradient in the reality, and piston on the push rod (3) and expansion loop (5) also are respective change and coincide with it.

Expansion loop can adopt with methods such as needle tubing one-shot forming, bonding or embedding and needle tubing and connect together tightly, and it can't be taken out from needle tubing under not producing destructive situation.

Expansion loop also can be placed in the tubule (5).In addition, this self-destruction part also can be placed on syringe needle afterbody (with the junction of needle tubing) and make the self-destructed disposable syringe needle.

Claims

1. expansion re-use preventing once-used syringe, form by syringe needle, needle tubing and the push rod that has a piston, the related piston of push rod can move back and forth in needle tubing, the inner chamber of needle tubing and syringe needle (hole) interconnects, it is characterized in that: the nearly needle end in needle tubing, also be furnished with self-destruction part with holes, the self-destruction part clogs the passage of syringe intracavity to the syringe needle hole.

2. product as claimed in claim 1, it is characterized by the self-destruction part is the round-meshed expansion loop in a middle part.