CN2507476Y

CN2507476Y - Disposable syringe

Info

Publication number: CN2507476Y
Application number: CN 01272420
Authority: CN
Inventors: 陆爱平
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-11-20
Filing date: 2001-11-20
Publication date: 2002-08-28
Anticipated expiration: 2011-11-20

Abstract

A disposable injector for intravenous injection or muscle injection, comprises a plastic needle cap, a rubber piston, a plastic injection rod and a injection needle, wherein the rubber piston is installed on the front end of the plastic injection rod, which is arranged inside the plastic needle cap, the injection needle is arranged on a slender taper tube on the front end of the plastic needle cap, the front half and the back half of the inner wall of the plastic needle cap have respectively a groove with a triangular longitudinal section or a triangular bench, an elastic self-locking block with a bell mouth facing the back is on back of the portion of the plastic injection rod that is close to the installation position of the rubber piston, and the back half of the self-locking block has a positioning rod. A protruding edge is provided on the injection needle, at the position corresponding to that of the slender taper tube of the front end of the plastic needle cap. The injector has the advantages that the injection needle won't be disassembled, the elastic self-locking block is blocked on the triangular groove or triangular step after one shot, preventing the plastic injection from being pulled out, so that the injector would never be reused, and the cross infection is prevented too.

Description

Disposable syringe

This utility model relates to a kind of medical apparatus and instruments, the disposable syringe that particularly a kind of injection for intravenous or intramuscular injection are used.

Used disposable syringe though title disposable syringe, all has once more or nonexpondable possibility, is to stop the cross infection phenomenon outside its deficiency at present.

The purpose of this utility model is the weak point that overcomes at present used disposable syringe, provide can only abandon after a kind of injection once and the disposable syringe that can not use for the second time.

The purpose of this utility model is achieved through the following technical solutions.Disposable syringe is made up of plastics needle guard, rubber piston, plastics injection rod and entry needle, and rubber piston is contained in the front end of plastics injection rod, and the plastics injection rod that rubber piston is housed is contained in the plastics needle guard, and entry needle is contained on the thin Taper Pipe of plastics needle guard front end.It is a leg-of-mutton groove or vertical section is respectively arranged is leg-of-mutton step that respectively there is a vertical section at the first half position of plastics needle guard inwall and later half position, it is a leg-of-mutton groove or vertical section is arranged is leg-of-mutton step that one vertical section is arranged on the thin Taper Pipe of its front end, back near dress rubber piston position on the plastics injection rod is a horn mouth elasticity self-locking block backward, at its later half position one gag lever post is arranged, have one to inward flange on the inner conical surface mouth that matches with the thin Taper Pipe of plastics needle guard front end on the entry needle.

Horn mouth elasticity backward is from boring the internal diameter of the point diameter of piece less than the plastics needle guard, and rear end diameter (being the horn mouth diameter) is greater than the internal diameter of plastics needle guard, and this horn mouth elasticity self-locking block backward can be made one with the plastics injection rod; Also can be to be contained on the plastics injection rod after horn mouth elasticity self-locking body is backward made separately.

Plastics needle guard inwall vertical section is that the inwall of leg-of-mutton limit of leg-of-mutton groove or leg-of-mutton step and plastic wrapper is perpendicular, and the vertical section on the thin Taper Pipe of this overcoat front end is that a leg-of-mutton limit of leg-of-mutton groove or leg-of-mutton step is perpendicular with the centrage of this thin Taper Pipe.The plastics injection rod can not be extracted out again, and entry needle can not be pulled down and can not use for the second time from the thin Taper Pipe of plastics needle guard front end, thereby can prevent the viral cross infection of using syringe to produce because of secondary effectively.

Accompanying drawing is a structural representation of the present utility model.Wherein Fig. 1 is that one vertical section is respectively arranged is leg-of-mutton groove the first half position of plastics needle guard inwall and later half position, and the vertical section is the structural representation of the disposable syringe of a leg-of-mutton groove on the thin Taper Pipe of front end; Fig. 2 is that one vertical section is respectively arranged is leg-of-mutton step the first half position of plastic wrapper inwall and later half position, and the vertical section is the structural representation of the disposable syringe of a leg-of-mutton step on the thin Taper Pipe of front end; Fig. 3 is the A place enlarged drawing of Fig. 1, and Fig. 4 is the B place enlarged drawing of Fig. 1, and Fig. 5 is the C place enlarged drawing of Fig. 2, and Fig. 6 is the D place enlarged drawing of Fig. 2.

Below in conjunction with description of drawings enforcement of the present utility model and operating position.In the accompanying drawing: 1-entry needle; 2-rubber piston; 3-plastics needle guard; 4-elasticity self-locking block; 5-plastics injection rod; 6-gag lever post; The vertical section is leg-of-mutton groove on the thin Taper Pipe of 7-plastics needle guard front end; Flange on 8-entry needle inner conical surface mouth; The vertical section is leg-of-mutton groove on 9-plastics needle guard inwall; The vertical section is leg-of-mutton step on the thin Taper Pipe of 10-plastics needle guard front end; The vertical section is leg-of-mutton step on 11-plastics needle guard inwall.

During enforcement, the first half position of plastics needle guard 3 inwalls and vertical section, later half position are that leg-of-mutton groove 9 or vertical section are that leg-of-mutton step 11 is arranged on when plastics injection rod 5 is shifted the end onto forward in plastics needle guard 3, horn mouth on the elasticity self-locking block 4 on this injection rod 5 just in time snaps in this triangular groove 9, or be stuck on the triangle step 11, plastics injection rod 5 can't be pulled out, thereby can not use by secondary, vertical section, the later half position of plastics needle guard 3 inwalls is that leg-of-mutton groove 9 or leg-of-mutton step 11 are arranged on the position that does not influence the 3 maximum drawing liquid amounts extractions of plastics needle guard.The gag lever post at plastics injection rod 5 later half positions is arranged on when not injecting, the horn mouth of elasticity self-locking block 4 is in the leg-of-mutton groove because of the existence of this limit bar can not be stuck in vertical section, plastics needle guard inwall first half position on this injection rod 5, or to be stuck in vertical section, first half position be on the leg-of-mutton step, this gag lever post 6 and plastics injection rod 5 link (can certainly be to be contained on the plastics injection rod 5 after making gag lever post 6 separately), but, when needs are injected, 6 bars of this limit are fractureed and can inject easy to break with the connection place of plastics injection rod 5.The vertical section is leg-of-mutton groove 10 or leg-of-mutton step 11 on the thin Taper Pipe of plastics needle guard 3 front ends, be arranged on when entry needle 1 loads on thin Taper Pipe, flange 8 on the entry needle 1 inner conical surface mouth just in time is stuck in this triangular groove 10, or be stuck on the triangle step 11, entry needle 1 can not be inserted down.

During use, entry needle 1 is put into injection, plastics injection rod 5 past post-tensionings, injection is extracted in the plastics needle guard 3, when being extracted into needed metering, entry needle 1 is left in the injection, then up entry needle 1, the plastics injection rod is up pushed away, air is extruded, at this moment gag lever post 6 is fractureed and to advance the footpath injection, because spacing 6 have fractureed, so can in plastics needle guard 3, shift plastics injection rod 5 onto the end always, at this moment elasticity self-locking block 4 is stuck in the triangular groove 9, or be stuck on the triangle step 11, make plastics injection rod 5 can not pull out again and can not use for the second time again, simultaneously since the flange 8 on the entry needle 1 inner conical surface mouth be stuck in the triangular groove 10 on the thin Taper Pipe of plastics needle guard 3 front ends, or be stuck on the triangle step 11, make entry needle 1 not pull down and no longer can use for the second time from the thin Taper Pipe of plastics pin 3 cover front ends again.

Claims

1. disposable syringe of forming by plastics needle guard, rubber piston, plastics injection rod and entry needle, rubber piston is contained in the front end of plastics injection rod, the plastics injection rod that rubber piston is housed is contained in the plastics needle guard, entry needle is contained on the thin Taper Pipe of plastics needle guard front end, it is characterized in that it is a leg-of-mutton groove or vertical section is respectively arranged is leg-of-mutton step that respectively there is a vertical section at the first half position of plastics needle guard inwall and later half position, it is a leg-of-mutton groove or vertical section is arranged is leg-of-mutton step that a vertical section is arranged on the thin Taper Pipe of its front end; Back near dress rubber piston position on the plastics injection rod is a horn mouth elasticity self-locking block backward, at its later half position one gag lever post is arranged, and has one to inward flange on the inner conical surface mouth that matches with the thin Taper Pipe of plastics needle guard front end on the entry needle.

2. by the described disposable syringe of claim 1, it is characterized in that the internal diameter of the point diameter of horn mouth elasticity self-locking block backward less than the plastics needle guard, rear end diameter (being the horn mouth diameter) is greater than the internal diameter of plastics needle guard.

3. by the described disposable syringe of claim 1, it is characterized in that plastics needle guard inwall vertical section is that the inwall of leg-of-mutton limit of leg-of-mutton groove or leg-of-mutton step and plastics needle guard is perpendicular, the vertical section is that a leg-of-mutton limit of triangular groove or leg-of-mutton step is vertical with the centrage of this Taper Pipe on the thin Taper Pipe of plastics needle guard front end.