CN201361324Y

CN201361324Y - Disposable injector

Info

Publication number: CN201361324Y
Application number: CNU2009200234634U
Authority: CN
Inventors: 牛俐
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-03-19
Filing date: 2009-03-19
Publication date: 2009-12-16
Anticipated expiration: 2019-03-19

Abstract

The utility model discloses a disposable injector, which belongs to medical instruments. The disposable injector mainly solves the problem that profiteers put the used disposable injectors into markets again through illicit channels. The disposable injector comprises a needle cylinder and a syringe needle; a push rod is arranged inside the needle cylinder; a piston is connected to the front end of the push rod; a position limiting sheet is arranged at the rear end of the push rod; the piston and the push rod are spliced together; a ring-shaped groove with the front end and the tail end connected mutually is formed on the side wall of the piston; and a ring-shaped bulge matched with the ring-shaped groove is formed on the inside wall of the needle cylinder. The ring-shaped bulge is arranged in a position corresponding to the groove when the piston is pushed to the bottom end of the needle cylinder. When the disposable injector is used, after drug inside the needle cylinder is injected, the piston is pushed to the bottom end of the needle cylinder, and the bulge on the inside wall of the needle cylinder is clampped into the groove on the piston at the moment; and if the push rod is taken out of the needle cylinder again, the piston can drop off from the push rod and is clamped in the needle cylinder, thereby avoiding the secondary use of the injector.

Description

A kind of disposable syringe

Technical field

This utility model relates to a kind of medical apparatus and instruments, specifically a kind of disposable syringe.

Background technology

For fear of causing cross infection, many times some patient need use disposable syringe, but some lawless person is in order to make profit now, to collect once more with the disposable syringe that should destroy after crossing and come into the market, if this syringe enters hospital and some clinics are used by people, will endanger the healthy of people greatly.

The utility model content

The purpose of this utility model is to provide a kind of disposable syringe, and this syringe can avoid secondary to use effectively.

The technical scheme in the invention for solving the technical problem is: a kind of disposable syringe, comprise syringe and the entry needle of being located at its front end, the entry needle outer setting has the entry needle guard shield, be provided with push rod in the syringe, the push rod front end is connected with piston, putting back-end is provided with and ends into banking stop, it is characterized in that, described piston is plugged on push rod, the sidewall of piston is provided with an end to end annular groove, is being provided with an annular protrusion that matches with annular groove on the piston on the medial wall of syringe.

Described annular protrusion is located at piston pairing position of groove on the piston when shifting the syringe lowermost end onto.

The beneficial effects of the utility model are: be provided with groove on piston, the medial wall of syringe is provided with the projection that matches with groove on the piston, after piston is pulled to the syringe lowermost end, projection on the syringe medial wall can stick in the groove on the piston, if push rod is taken out from syringe again, piston will come off from push rod and be stuck in the syringe, effectively avoids the secondary of syringe to use, and prevents from that the lawless person from coming into the market disposable syringe once more to cause cross infection.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1 push rod, 2 syringes, 3 pistons, 4 annular protrusions.

The specific embodiment

As shown in Figure 1.A kind of disposable syringe, comprise syringe 2 and the entry needle of being located at its front end, the entry needle outer setting has the entry needle guard shield, be provided with push rod 1 in the syringe 2, push rod 1 front end is connected with piston 3, and push rod 1 rear end is provided with ends into banking stop, and described piston 3 is plugged on push rod 1, the sidewall of piston 3 is provided with an end to end annular groove, is being provided with an annular protrusion 4 that matches with annular groove on the piston 3 on the medial wall of syringe 2.Described annular protrusion 4 is located at piston 3 pairing position of groove on the piston 3 when shifting syringe 2 lowermost ends onto.

During use, after the injection of medicines in the syringe 2 finished, piston 3 can be pulled to the lowermost end of syringe 2, at this moment the annular protrusion 4 on syringe 2 medial walls can stick in the groove on the piston 3, if push rod 1 is taken out from syringe 2 again, piston 3 will come off from push rod 1 and be stuck in the syringe 2, effectively avoids the secondary of syringe to use, and prevents from that the lawless person from coming into the market disposable syringe once more to cause cross infection.

Claims

1, a kind of disposable syringe, comprise syringe and the entry needle of being located at its front end, the entry needle outer setting has the entry needle guard shield, be provided with push rod in the syringe, the push rod front end is connected with piston, and putting back-end is provided with and ends into banking stop, it is characterized in that, described piston is plugged on push rod, and the sidewall of piston is provided with an end to end annular groove, is being provided with an annular protrusion that matches with annular groove on the piston on the medial wall of syringe.

2, a kind of disposable syringe according to claim 1 is characterized in that, described annular protrusion is located at piston pairing position of groove on the piston when shifting the syringe lowermost end onto.