CN2462951Y

CN2462951Y - Re-use preventing once-used syringe

Info

Publication number: CN2462951Y
Application number: CN 01214065
Authority: CN
Inventors: 刘光奎
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-02-05
Filing date: 2001-02-05
Publication date: 2001-12-05
Anticipated expiration: 2011-02-05

Abstract

The utility model relates to a medical syringe, particularly a disposable syringe, the aim of which is to provide a self-destroying syringe after one-time injection. The syringe is characterized in that a needle head 1 is fixedly connected to the top end of an elliptic syringe cylinder 5; the outer periphery of a piston 4 is coated with elastic materials 3, and is in sliding fit with the inner periphery of the syringe cylinder 5; a sphere 7 at the front end of a push rod 6 is matched with a spherical concave hole at the center of the rear part of the piston 4. When the syringe piston is pushed to an upper dead point, symmetrical cones 8 at the top end of the syringe piston burst holes 2 at the thin wall of the front end of the syringe cylinder, and simultaneously, symmetrical barbs 9 at the root part of the needle head enters a spherical concave hole at the top part of the piston, and is locked. When the push rod is pulled, the sphere 7 at the top end of the push rod 6 slides out of the spherical concave hole at the center of the rear part of the piston, and therefore, the purpose of self-destroying is achieved.

Description

Re-use preventing once-used syringe

This utility model relates to injector for medical purpose, particularly disposable syringe.

The disposable medical syringe designs in order to prevent cross infection virus or pathogenic bacteria, and the appropriate post processing of using is not done by some geographic hospitals at present, causes the disposable syringe after using to flow into hospital again, and its hazardness is conceivable.

Disposable medical syringe and traditional syringe comparison, all form by syringe needle, column type injection tube, piston, push rod etc., wherein push rod and piston design for one, different is the material difference of the two use, the former uses plastics and the latter uses glass, thus the former can not the high temperature steaming sterilization, so can only disposablely use.

Sign in this, the purpose of this utility model is to provide a kind of syringe that just can self-destruction after disposable use.

This utility model is on existing syringe basis, adopt two kinds of self-destruction modes, the one, by one symmetric cone bursting injection tube top, piston upper end, one symmetric book cinclides, the 2nd, a symmetrical overhead kick of syringe needle root tangles upper end, ball-type hole, center, piston upper end one symmetric crosspiece makes piston separate with injector push-rod, and the two all can make syringe self-destruction and can not reusing after use.

This utility model adopts the injection tube of cylindroid die cavity and the piston of inner chamber cooperation with it on existing syringe basis.This syringe piston is an independent component, and there are a symmetric cone and ball-type pit in the upper end, and the pit upper edge is along having a symmetric little crosspiece, piston base center that the microspheric form pit that cooperates with push rod upper end spheroid is arranged.

Above-mentioned outside piston is coated with on the sealant, piston of elastomeric material equidistant two seals ring, and the two seals ring makes piston upper and lower mobile resistance in injection tube reduce, make again simultaneously the unlikely leakage of liquid seal.

When moving to top dead centre on the above-mentioned piston, the thin-walled hole at symmetric cone bursting injection tube top, simultaneously, the symmetric overhead kick of syringe needle root slips into the ball-type pit at piston center, sees Fig. 9.

The cross section of above-mentioned piston push rod is seen Fig. 7,8 for " ten " font, the ball-type pit of its vertical spheroid and piston base is for partly being slidingly matched, when piston after top dead centre is by the overhead kick locking of syringe needle, pull back push rod, the push rod bulb of this moment just skids off piston base ball-type hole.Piston just can not move back and forth, and sees Fig. 9.

Above-mentioned liquid capacity needle drawing line (10) is 4 groups (among figure only mark wherein one groups), is convenient to syringe and can both accurately observes the volume of liquid at different parts, sees Fig. 5.

Brief description of drawings

Fig. 1 is the structural representation of this utility model " re-use preventing once-used syringe ".Fig. 2 is the right view of Fig. 1, shows disciform injection tube and the injection needle that connects firmly in the injection tube upper end, and the piston that has catch bar to cooperate with push rod is inject state.

Fig. 3 is the vertical view of Fig. 1.

What Fig. 5 showed is the molten long-pending graduation mark of liquid of syringe.

Fig. 8 shows the profile of syringe transversal profile Fig. 7.

Fig. 9 shows the state that push-pull bar moves backward after the syringe self-destruction.

Embodiment:

This utility model re-use preventing once-used syringe, as Fig. 1,2,3, shown in 5.Constitute by syringe needle, injection tube, piston, push-pull bar etc.

Above-mentioned syringe needle (1) connects firmly outside the part of injection tube (5), is common structure, and the syringe needle afterbody that connects firmly in injection tube is a symmetric semi-circular barb (9).

Above-mentioned injection tube (5) external form ovalize cavity, the top is the elliptic cone shape.Syringe needle (1) is packed in the center of cone.The long limit of cone has symmetric thin-walled hole (2) coaxial corresponding with the symmetric cone of piston (4) front end.The injection tube peripheral, axial has 4 liquid capacity sign graduation marks, and the injection tube tail end is opening-like.

It is oval that above-mentioned piston (4) circumference external form is, and is slidingly matched with the injection tube intracavity, and the long limit of piston tip has symmetric cone (8) corresponding with the thin-walled hole (2) at injection tube top.The top land center has a ball-type shrinkage pool corresponding with syringe needle afterbody (9), and the little crosspiece of symmetric locking syringe needle afterbody barb (9) is arranged on the ball-type shrinkage pool.

Center, piston lower end has the ball-type body (7) of a ball-type pit and push-pull bar (6) upper end to carry out the hemicompact close fit.The piston periphery is coated with the sealant (3) that elastomeric material constitutes.Along piston (4) the equidistant semi-circular sealing ring of twice axially arranged, when pushing away liquid, play sealing.

Above-mentioned push-pull bar (6) transversal profile is cross Fig. 7,8, and the top of push-pull bar is ball-shaped structure (7), and afterbody is the push-pull handle of common structure.

What this utility model re-use preventing once-used syringe used is the manufacturing of medical grade transparent plastic.During use, equipped good push-pull bar and piston combined as a whole put into injection tube, piston is pushed the top but do not push up and wear the thin-walled hole that injection tube pushes up.Syringe needle is thrust in the medicinal liquid, slowly push-pull bar is pulled back, medicinal liquid is entered in the injection tube, then syringe needle is thrust human body.Injecting liquid drug is finished inside propelling of push-pull handle.The cone of top land just pushes up the thin-walled hole of wearing the injection tube top, and the barb of syringe needle afterbody enters top land center ball-type shrinkage pool.Extract syringe needle, injection is finished, and syringe also reaches the purpose of breaking-up.

Claims

1, re-use preventing once-used syringe comprises syringe cylinder (5), is packed in the syringe needle (1) on the injection tube.Piston (4) with the injection tube intracavity is slidingly matched with the push rod (6) that piston (4) afterbody ball-type hole cooperates, is characterized in that there are a symmetric cone (8) and the corresponding with it vertical thin-walled of syringe cylinder hole (2) in piston (4) top; The spheroid (7) that ball-type hole, piston (4) tail end center cooperates with push rod (6); The lockable mechanism that the two barbs (9) of syringe needle afterbody cooperate with piston (4) ball-type hole crosspiece.

2, syringe cylinder according to claim 1 (5) is characterized in that its profile is the ellipticalness cavity, and the piston that makes it to cooperate (4) does not produce when moving up and down in cavity and rotatablely moves, and a symmetric thin-walled hole (2) is arranged at the top.Mark vertically around the outer wall four liquid capacity graduation marks are arranged.

3, syringe needle according to claim 1 is characterized in that afterbody has a symmetric barb (9), and syringe needle (1) connects firmly at syringe (5) front end.

4, piston according to claim 1 (4) is characterized in that its profile is symmetric ellipse along axis, and there is a symmetric cone (8) and a ball-type shrinkage pool on its top.Its ball-type shrinkage pool top has along axis one symmetric crosspiece, and there is the ball-type shrinkage pool that cooperates with push rod (6) top spheroid (7) at the piston tail center.Top land and circumference are coated with elaxtic seal.The piston periphery has the equidistant sealing ring of twice.