CN1264579C - Disposable syringe - Google Patents

Abstract

The present invention relates to a disposable syringe for intravenous injection or intramuscular injection, which is composed of a plastic needle guard, a rubber piston, a plastic injection rod and an injection needle, wherein the rubber piston is arranged on the front end of the plastic injection rod, and the plastic injection rod which is provided with a rubber piston is arranged in the plastic needle guard. The connecting parts of a base of the plastic injection rod and a front cross of the plastic injection rod, the front cross and a back cross of the plastic injection rod, and the back cross of the plastic injection rod and a handle of the plastic injection rod are respectively provided with a fragile point. The plastic injection rod is provided with a rubber piston base, the back circumference of the plastic injection rod is provided with a plurality of elastic sawtooth blocks with backward tooth tips, and the back half part of the plastic injection rod is provided with a gag lever post. The front half part and the back half part of the inner wall of the plastic needle guard is respectively provided with a groove with a rectangular longitudinal section. After the present invention is once injected, because the tooth tips of the elastic sawtooth blocks are clamped in the rectangular groove on the front half part of the inner wall of the plastic needle guard, the plastic injection rod can not be drawn out. If the plastic injection rod is forcibly pushed and pulled, the fragile points on the plastic injection rod are broken, and consequently, the syringe can not be reused. Thus, the cross infection of viruses can be prevented.

Description

Disposable syringe

Affiliated technical field:

The present invention relates to a kind of medical apparatus and instruments, particularly relate to the disposable syringe that a kind of injection for intravenous or intramuscular injection are used.

Background technology:

Present used disposable syringe, though title disposable syringe, all has once more or nonexpondable possibility, its weak point is the generation that can not stop the cross infection phenomenon.

Summary of the invention:

The objective of the invention is to overcome the weak point of 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 objective of the invention is to be achieved through the following technical solutions.Disposable syringe is made up of plastics needle guard, rubber piston, plastics injection rod, gag lever post and entry needle.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 orthogonal groove that respectively there is a vertical section at the first half position of plastics needle guard inwall and later half position, or to have only vertical section, latter part be orthogonal groove, and plastics injection rod dress is made up of the base of rubber piston, forward and backward cross, handle.The plastics injection rod is equipped with before rubber piston base back and the plastics injection rod between the cross, between the forward and backward cross of plastics injection rod and between the handle of the back cross of plastics injection rod and plastics injection rod an individual frangible place is arranged respectively, dress rubber piston base back circle distribution has several elasticity sawtooth pieces on the plastics injection rod, sawtooth piece crown has individual gag lever post at its later half position backward.Disconnects in the middle of the forward and backward cross on the plastics injection rod, preceding cross turns over an angle with the back cross, only be connected on forward and backward cross edge or cross disconnects all around, junction point only be in the middle of a place.Disconnect in the middle of between preceding cross and the plastics injection rod dress rubber piston base back, only on the cross edge, disconnect around connection or the cross, junction point is only at a middle place, disconnect in the middle of between the back cross of plastics injection rod and the handle of plastics injection rod, junction point only disconnects on the edge of cross or around the cross, and junction point is only at a middle place.Be distributed in the plastics injection rod and be equipped with that elasticity sawtooth piece sawtooth root diameter is less than plastics needle guard internal diameter on the circumference of rubber piston base back, the sawtooth crown is greater than the internal diameter of plastics needle guard.

The invention has the beneficial effects as follows like this, the rubber piston front of plastics injection rod front end touches the plastics needle guard, push hard slightly, before on the plastics injection rod, edge junction point between the back cross or intermediate connection point fracture, because elasticity sawtooth piece crown is stuck in the rectangle groove of plastics needle guard inwall first half position, the plastics injection rod can not be extracted out, if pull at, then edge junction point between the cross of back or intermediate connection point fracture on the edge junction point between the cross or intermediate connection point and plastics injection rod upper handle and the plastics injection rod before plastics injection rod dress rubber piston base and the plastics injection rod.Can not use syringe for the second time, thereby effectively prevent the viral cross infection of using syringe to produce because of secondary.

Description of drawings:

Accompanying drawing is a structure sketch map of the present invention.Cross respectively has the sketch map at a frangible place before and after the back cross of Fig. 1, Fig. 2 plastics injection rod and plastics injection rod handle and the plastics injection rod.Cross respectively has the sketch map at a frangible place before and after Fig. 3, Fig. 4, plastics injection rod dress rubber piston base back and preceding cross and the plastics injection rod.Cross, plastics injection rod base and preceding cross respectively have the sketch map at frangible place before and after the back cross of Fig. 5, Fig. 6 plastics injection rod and plastics injection rod handle, the plastics injection rod.Fig. 7 is the sketch map of plastics injection rod structure among Fig. 6.Fig. 8 is the enlarged drawing at Fig. 6 A place.Fig. 9 is the enlarged drawing at Fig. 6 B place.Figure 10 is the vertical view at Fig. 7 C place.Figure 11 is the D-D profile of Figure 10.

Below in conjunction with description of drawings the invention process and operating position.1-entry needle in the accompanying drawing, 2-rubber piston, 3-plastics needle guard, 4-plastics injection rod, 5-elasticity sawtooth piece, 6-plastics injection rod rubber piston base and the frangible place of preceding cross, the frangible place of cross and handle behind 7-plastics injection rod, the frangible place of cross junction point before and after 8-plastics injection rod, the vertical section is orthogonal groove on 9-plastics needle guard, 10-gag lever post, the base of 11-plastics injection rod dress rubber piston, cross before 12-plastics injection rod, the handle of 13-plastics injection rod, cross behind 14-plastics injection rod.

The specific embodiment

During enforcement, press many different compound modes such as Fig. 1, Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6.Below introduce and press Fig. 1, the first half position of plastics needle guard 3 inwalls and vertical section, later half position are that orthogonal groove 9 is arranged on when plastics injection rod 4 is shifted the end onto forward in plastics needle guard 3, elasticity sawtooth piece 5 crowns on this plastics injection rod 4 just in time snap in this rectangle groove 9, plastics injection rod 4 can't be pulled out, if the edge junction point fracture of cross 8 before and after pushing hard on the plastics injection rod then, if pull at, back cross 14 ruptures with the edge junction point of plastics injection rod handle 7 on the plastics injection rod.Thereby can not use by secondary, vertical section, the later half position of plastics needle guard 3 inwalls is a rectangle groove 9, and being arranged on does not influence on the plastics needle guard 3 maximum drawing liquid amounts extraction positions.The gag lever post 10 at plastics injection rod 4 later half positions is arranged on when not injecting, elasticity sawtooth piece 5 crowns exist because of gag lever post 10 on this injection rod 4, and can not be stuck in vertical section, plastics needle guard 3 inwall first half position is in the rectangle groove 9, this gag lever post 10 is connected (gag lever post 10 also can be contained on the plastics injection rod handle 13) with cross 14 behind the plastics injection rod, the junction frangibility fractures gag lever post 10 can inject when needs are injected.

Press Fig. 3, when Fig. 4 shifts the end onto when plastics injection rod 4 forward in plastics needle guard 3, firmly push away forward again, then cross 8 edge junction point fractures before and after the plastics injection rod, when the plastics injection rod withdraws from the plastics needle guard, elasticity sawtooth piece 5 crowns that the plastics injection rod is equipped with rubber piston base back are just snapping in the later half position of the plastics needle guard rectangle groove 9, plastics injection rod 4 can't be pulled out, if pull at then plastics injection rod dress rubber piston base 11 back and preceding ten 6 edge junction point or middle place junction point fracture, and can not use by secondary, so this structural plastic needle guard 3 can't be taken apart after assembling with plastics injection rod 4, vertical section, the later half position of plastics needle guard 3 inwalls is that rectangle groove 9 is arranged on the position that does not influence the maximum extraction of plastics needle guard.The gag lever post 10 at plastics injection rod 4 later half positions is arranged on when not injecting, these plastics injection rod 4 front rubber pistons are near arriving plastics needle guard 3 bottoms, this gag lever post 10 is connected (gag lever post 10 is contained on the handle 13 of plastics injection rod) with the back cross 14 of plastics injection rod, the junction frangibility fractures this gag lever post 10 can inject when needs are injected.Because can't be under the situation of not damaging plastics needle guard 3 and plastics injection rod 4 after 4 assemblings of plastics needle guard 3 and plastics injection rod can't disassemble, so plastics needle guard 3 does not wrap in the plastic bag after will assembling with plastics injection rod 4 when packing, so that whether difference was used, this structure drains the residual air in the plastics needle guard 3 substantially when drawing liquid.

During use, entry needle 1 is put into injection, plastics injection rod 4 past post-tensionings, injection is extracted in the plastic sheath 3, when being extracted into needed metering, entry needle 1 is left in the injection, make entry needle 1 then upwards, plastics injection rod 4 is up pushed away, air is extruded, at this moment gag lever post 10 is fractureed and can inject, so because gag lever post 10 has fractureed plastics injection rod 4 has been shifted onto the end in plastics needle guard 3 always, at this moment elasticity sawtooth piece crown 5 is stuck in the rectangle groove 9, plastics injection rod 4 can not be pulled out, if plastics needle guard 3 first half positions do not have rectangle groove can continue firmly to push away forward, the cross fracture makes plastics injection rod 4 can not pull out from plastics needle guard 3 and can not use for the second time before and after the plastics injection rod.

Claims (5)

1, a kind of disposable syringe, by the plastics needle guard, rubber piston, the plastics injection rod, gag lever post and entry needle are formed, rubber piston is contained in the plastic bar front end, 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, there is a gag lever post at the later half position of plastics injection rod, the plastics injection rod is by the base of dress rubber piston, before, back cross, handle is formed, it is characterized in that: being equipped with between the preceding cross on rubber piston base back and the plastics injection rod on the plastics injection rod, before the plastics injection rod, between the back cross, between back cross and the plastics injection rod upper handle a frangible place is arranged respectively on the plastics injection rod, several elasticity sawtooth pieces distribute on the back circumference of the dress rubber piston base on the plastics injection rod, it is orthogonal groove that the first half of plastics needle guard inwall and latter half respectively have a vertical section, or to have only latter half that one vertical section is arranged be orthogonal groove.

2, by the described disposable syringe of claim 1, it is characterized in that: disconnect in the middle of the forward and backward cross on the plastics injection rod, preceding cross turns over an angle, only is connected on the edge of forward and backward cross with the back cross, perhaps cross around disconnect, junction point is only at a middle place.

3, by the described disposable syringe of claim 1, it is characterized in that: the centre of being equipped with between the rubber piston base back on cross and the plastics injection rod before the plastics injection rod disconnects, junction point is only at the edge of cross, perhaps disconnect a place in the middle of junction point has only around the cross.

4, by the described disposable syringe of claim 1, it is characterized in that: back cross on the injection rod and the centre between the handle on the injection rod disconnect, junction point only on the edge of cross, perhaps disconnects around the cross, a place in the middle of junction point has only.

5, by the described disposable syringe of claim 1, it is characterized in that: elasticity sawtooth piece is distributed in the plastics injection rod base back that rubber piston is housed, and sawtooth piece crown backward, and sawtooth piece root diameter is less than plastics needle guard internal diameter, and sawtooth piece crown diameter is greater than plastics needle guard internal diameter.

Images