CN201267664Y

CN201267664Y - Disposable syringe

Info

Publication number: CN201267664Y
Application number: CNU2008201735819U
Authority: CN
Inventors: 朱贤嫒; 王书强; 王鲁云
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-10-22
Filing date: 2008-10-22
Publication date: 2009-07-08
Anticipated expiration: 2018-10-22

Abstract

The utility model discloses a disposable syringe, which comprises a needle cylinder and a push rod. The wall of an inner cavity at the back end of the needle cylinder is provided with an annular check groove; the back end of the push rod is provided with a check spring plate which corresponds with the check groove; the push rod is provided with a clamp ring which covers the check spring plate; and the outer diameter of the clamp ring is larger than the inner diameter of the needle cylinder. After the injection is completed through pushing the piston with the push rod, the check spring plate is right clamped in the check groove in the needle groove to prevent the push rod from pulling out the piston again, thereby realizing the purpose of the auto-disable disposable use, preventing the repeated use of the disposable syringe and avoiding other hidden dangers. Because the push rod is provided with the clamp ring which covers the check spring plate and the outer diameter of the clamp ring is larger than the inner diameter of the needle cylinder, when the disposable syringe leaves the factory or is still not used, the clamp ring can prevent the push rod from completely entering the needle cylinder, thereby preventing the check spring plate from falling into the check groove. If required, the clamp ring can be taken down or damaged.

Description

Disposable syringe

Technical field

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

Background technology

As everyone knows, syringe is a kind of medical apparatus commonly used, generally comprises syringe needle, syringe and piston etc., and syringe needle is positioned on the syringe, and piston is in the push rod front end and slidably is sleeved in the syringe; For preventing cross infection, the disposable use of syringe more and more is subject to people's attention; But the disposable operating position of present most syringe is in " managerial " notion, and disposable syringe itself commonly used does not now have self-destruction, but has reuse, has stayed hidden danger to cross infection like this, the infection that yet tends to produce the disease of.

The utility model content

The technical problems to be solved in the utility model provides a kind of disposable syringe with protectiveness self-distruction structure.

For solving the problems of the technologies described above, the disposable syringe that is provided comprises syringe and push rod, and its construction features is: the internal chamber wall of back end of syringe is provided with annular stop-return slot, and the rear end of push rod is provided with the non-return shell fragment that adapts with stop-return slot.

Also be provided with the snap ring that encases the non-return shell fragment on the described push rod, the external diameter of snap ring is greater than the internal diameter of syringe.

After adopting said structure, because being provided with annular time, the internal chamber wall of back end of syringe ends groove, the afterbody correspondence of push rod be provided with the non-return shell fragment, after push rod promotion piston has been injected, the non-return shell fragment is stuck in the stop-return slot of syringe inside just, stops retracting once more of push rod, plays the purpose that self-destructed disposable uses, prevent the disposable syringe repeated use, avoided causing other hidden danger; Also be provided with the snap ring that encases the non-return shell fragment on the push rod, the external diameter of snap ring is greater than the internal diameter of syringe, when dispatching from the factory or this utility model when not being used, snap ring can stop push rod to enter syringe fully, prevent that the non-return shell fragment from falling into stop-return slot, when need using, snap ring taken or damage getting final product.

Description of drawings

Accompanying drawing is a cutaway view of the present utility model.

The specific embodiment

Disposable syringe as shown in drawings, comprise syringe 1, the front end of syringe 1 is provided with syringe needle 2, the piston 3 that is in push rod 4 front ends is sleeved in the syringe 1, the internal chamber wall of syringe 1 rear end is provided with annular stop-return slot 5, the afterbody of push rod 4 is provided with non-return shell fragment 6, after push rod 4 promotion pistons 3 have been injected, non-return shell fragment 6 is stuck in the stop-return slot 5 of syringe 1 inside just, can prevent retracting once more of throw-out lever, non-return shell fragment 6 tiltedly plays the limit for the otch shell fragment on the push rod or the projection that is built up on the push rod, the shape of corresponding stop-return slot 5 must be blocked non-return shell fragment 6, before this utility model is not used, also is provided with the snap ring 7 that encases non-return shell fragment 6 on the push rod 4, the external diameter of snap ring 7 is bigger than the internal diameter of syringe 1, can prevent that throw-out lever 4 enters in the syringe 1 fully.

Claims

1, a kind of disposable syringe comprises syringe (1) and push rod (4), it is characterized in that: the internal chamber wall of syringe (1) rear end is provided with annular stop-return slot (5), and the rear end of push rod (4) is provided with the non-return shell fragment (6) that adapts with stop-return slot (5).

2, disposable syringe according to claim 1 is characterized in that: also be provided with the snap ring (7) that encases non-return shell fragment (6) on the described push rod (4), the external diameter of snap ring (7) is greater than the internal diameter of syringe (1).