CN2668144Y

CN2668144Y - Disposable safety syringe

Info

Publication number: CN2668144Y
Application number: CNU2003201317336U
Authority: CN
Inventors: 谢先文
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-12-30
Filing date: 2003-12-30
Publication date: 2005-01-05
Anticipated expiration: 2013-12-30
Also published as: WO2005065755A1

Abstract

The utility model discloses a disposable safety injector, belonging to medical equipment. The disposable safety injector comprises a syringe, a push rod, a push rod piston and a needle. The push rod piston is installed at the front end of the push rod, is fitted with the inner wall of the syringe and can slide along the inner wall; the front end of the syringe is provided with a needle stand, and the needle is installed on the needle stand. When an injection by the disposable safety injector is finished, the piston contacts completely with the bottom of the syringe, so the residual of physic liquor is avoided; in addition, the needle adopting a special structure is favorable to the protective self-destruction of the entire injector, so the purpose of disposable use is reached.

Description

Disposable safety injector

Technical field

This utility model belongs to medical apparatus and instruments, is in particular a kind of disposable safety injector.

Background technology

As everyone knows, syringe is a kind of medical apparatus commonly used, has generally comprised syringe needle, syringe, piston and push rod etc., and syringe needle is positioned on the syringe, and piston is in the push rod front end and is sleeved in the syringe slidably.In order to prevent cross infection, the disposable use of syringe more and more is subject to people's attention.But present widely used disposable syringe belongs to " managerial " notion; and existing general syringe himself does not have destructive protection structure; thereby make that conventional injector is not " disposable " on serviceability; can use repeatedly; stay hidden danger to cross infection, the propagation that tends to produce the disease of.In addition, existing syringe owing to outside syringe needle is exposed to mostly, very easily stab or scratch medical personnel or relevant patient, causes new cross infection in injection finishes subsequently processing procedure.The patent No. is 98250220.6 safety injector, by injection tube, needle assembly, block base, composition such as push rod and dop, wherein block base is positioned at syringe front end place, and the combination of the front end of needle assembly and block base, then there is a connecting hole block base rear end, dop is located at the push rod front end, when push rod is advanced near foremost the time to the injection tube front end, dop produces with block base and engages, make when push rod is extracted backward, block base together is pulled to together with needle assembly in the accommodating chamber of syringe, stabs human body to prevent needle body, reaches disposable purpose, but because this injector designed unreasonable structure, technological deficiencies such as the medicinal liquid residual quantity is big, and needle stand is poorly sealed, its product serviceability are stable inadequately.

Summary of the invention

The purpose of this utility model is to provide a kind of have protectiveness self-distruction structure and the disposable completely safety injector of injecting liquid drug at the existing defective of existing syringe.

Disposable safety injector of the present utility model is realized in the following manner: it includes syringe, push rod, push-rod piston, push-rod piston is contained in the push rod leading section, push-rod piston and syringe inwall coincide and can slide along inwall, and further include syringe needle, above-mentioned syringe front end has syringe needle Cuo, and syringe needle is installed on the needle holder.

Above-mentioned syringe needle is made of needle tubing seat, needle tubing cover, needle tubing, sealing lock ring and spring; The rear end of needle tubing cover has step, and its center is a through hole; Needle tubing is contained in needle tubing and overlaps in the anterior through hole and the outstanding needle tubing cover of its syringe tip; The cavity of the center of needle tubing seat for connecting; Described sealing lock ring is contained on the rearward end step of needle tubing cover and is installed on the not end of needle tubing seat cavity; Above-mentioned spring is contained in the cavity of needle tubing seat, is between the step of the rear end step of needle tubing cover and needle tubing seat cavity central authorities; Has fit structure between the needle holder of described needle tubing seat and syringe front end.

This safety injector owing to adopt special needle head structure, helps whole syringe is carried out protectiveness ground self-destruction because when having injected, piston contacts fully with the syringe bottom, has avoided the residual of medicinal liquid in addition, really reaches disposable purpose.

The drawing explanation

Fig. 1 looks diagrammatic sketch for a kind of master of the present utility model;

Fig. 2 is a kind of configuration diagram of the present utility model;

Fig. 3 is an another kind of configuration diagram of the present utility model.

The specific embodiment

Referring to Fig. 1, disposable safety injector of the present utility model, include syringe 1, push rod 2, push-rod piston 3, push-rod piston 3 is contained in push rod 2 leading sections, push-rod piston 3 coincide with the syringe inwall and can slide along inwall, this part technology is similar to conventional injector, does not elaborate at this.This utility model further includes syringe needle 4, and above-mentioned syringe front end has syringe needle Cuo 11, add man-hour can be injection molded with the syringe one; Syringe needle 4 is installed on the needle holder 11.

Referring to Fig. 2 and Fig. 3, above-mentioned syringe needle 4 is made of needle tubing seat 41, needle tubing cover 42, needle tubing 43, sealing lock ring 44 and spring 45; The rear end of needle tubing cover has step, and its center is a through hole; Needle tubing 43 is contained in needle tubing and overlaps in the anterior through hole and the outstanding needle tubing cover 42 of its syringe tip, is convenient to injection; The cavity of the center of needle tubing seat 41 for connecting, this cavity can hold needle tubing cover 42 and allow the needle tubing cover to slide.Described sealing lock ring 44 is contained on the rearward end step of needle tubing cover and is installed on the not end of needle tubing seat cavity, and the sealing lock ring guarantees the sealing between needle tubing cover and the needle tubing seat on the one hand, makes needle tubing cover (together with needle tubing) location and installation on the other hand on the needle tubing seat.Above-mentioned spring 45 is contained in the cavity of needle tubing seat, is between the step of the rear end step of needle tubing cover and needle tubing seat cavity central authorities.Be in stress under the normal condition, when sealing lock ring being open when constraint relief, needle tubing cover 42 is subjected to eject backward under the effect of elastic force and goes.Has fit structure between the needle holder 11 of described needle tubing seat 41 and syringe front end.

Above-mentioned fit structure is spiral head and spiral mouth structure; The front end of needle holder is the spiral mouth, and the needle tubing seat is outward a spiral head.

Above-mentioned fit structure is the embedded structure that clamps, and the front end of needle holder is embedded bayonet socket, the latch that the needle tubing seat matches for bayonet socket therewith.

Above-mentioned fit structure is a screw connection structure.

Said structure is assembled together the needle tubing seat when assembling by its fit structure and needle holder.Sealing for after guaranteeing to assemble is provided with sealing gasket 5 at needle tubing seat and needle holder contact position.

Described push rod front end has apical ring 21, and this apical ring 21 is corresponding with sealing lock ring 44, is used for advancing before the dense block hoop with the needle tubing seat, removes the constraint of needle tubing cover, so that needle tubing is enclosed within the effect of its spring bounce-back backward.Described apical ring 21 is made of two semicircles of push rod front end, has opening in the middle of it, and when repeatedly enforcing the sealing lock ring, this apical ring can stressedly outwards open, and makes its week directly greater than the sealing lock ring, in case repeatedly use repeatedly.

Under the promotion of push rod, prevent the needle tubing cover to front slide, have a block 46 that shrinks to the center at the front-end edge of needle tubing seat cavity.

For the unexpected stressed promotion dense block hoop front slide of anti-throw-out lever collar is separated pressing spring 45, between above-mentioned putting back-end and syringe, be provided with the handspike bearing 6 of limit function, when firmly pushing ahead push rod, can drive bearing and enter bearing strong to front slide or push rod block together, finish injection and self-destruction completely.

Referring to Fig. 2, this utility model is after injection work is finished, the apical ring of push rod front end promotes dense block hoop interior (preceding) slip and separates pressing spring, and when push rod was pulled back, needle tubing cover (together with needle tubing) was subjected under the elastic force effect, automatically spring in the syringe, when pushing push rod once more, needle tubing cover or needle tubing can be squeezed and ruin, and because in the needle tubing cover resilience inserting needle tube, can't locate the needle tubing cover, can prevent to be utilized once more.Simultaneously, can make whole syringe unrenewable the push rod that fractures, realize only self-destruction of syringe, avoid syringe to reuse for once using with this.

Referring to Fig. 3, described push rod front portion has cavity volume 23, has one at push rod apical ring rear portion and stops up 22, and this obstruction 22 has sealing property, in case medicinal liquid infiltrates in the cavity volume.After injection finishes, apical ring promotes dense block hoop interior (preceding) slip and separates pressing spring, simultaneously, obstruction in the push rod is subjected to counter being advanced in the cavity volume of needle tubing cover, the needle tubing cover is sprung in the cavity volume, entry needle and whole syringe can not be used repeatedly, realize only self-destruction of syringe, avoid syringe to reuse for once using with this.

Claims

1, disposable safety injector, include syringe (1), push rod (2), push-rod piston (3), push-rod piston (3) is contained in push rod (2) leading section, push-rod piston (3) coincide with the syringe inwall and can slide along inwall, it is characterized in that it further includes syringe needle (4), above-mentioned syringe front end has syringe needle Cuo (11), and syringe needle (4) is installed on the needle holder (11).

2, syringe according to claim 1 is characterized in that: above-mentioned syringe needle (4) is made of needle tubing seat (41), needle tubing cover (42), needle tubing (43), sealing lock ring (44) and spring (45); The rear end of needle tubing cover has step, and its center is a through hole; Needle tubing (43) is contained in needle tubing and overlaps in the anterior through hole and the outstanding needle tubing cover (42) of its syringe tip; The cavity of the center of needle tubing seat (41) for connecting; Described sealing lock ring (44) is contained on the rearward end step of needle tubing cover and is installed on the not end of needle tubing seat cavity; Above-mentioned spring (45) is contained in the cavity of needle tubing seat, is between the step of the rear end step of needle tubing cover and needle tubing seat cavity central authorities; Has fit structure between the needle holder (11) of described needle tubing seat (41) and syringe front end.

3, syringe according to claim 2 is characterized in that: above-mentioned fit structure is spiral head and spiral mouth structure; The front end of needle holder is the spiral mouth, and the needle tubing seat is outward a spiral head.

4, syringe according to claim 2 is characterized in that: above-mentioned fit structure is the embedded structure that clamps, and the front end of needle holder is embedded bayonet socket, the latch that the needle tubing seat matches for bayonet socket therewith.

5, syringe according to claim 2 is characterized in that: above-mentioned fit structure is a screw connection structure.

6, according to claim 2 or 3 or 4 or 5 described syringes, it is characterized in that: be provided with sealing gasket (5) at needle tubing seat and needle holder contact position.

7, according to claim 2 or 3 or 4 or 5 described syringes, it is characterized in that: described push rod front end has apical ring (21), and this apical ring (21) is corresponding with sealing lock ring (44).

8, syringe according to claim 7 is characterized in that: the front-end edge at needle tubing seat cavity has a block (46) that shrinks to the center.

9, syringe according to claim 7 is characterized in that: the handspike bearing (6) that is provided with limit function between above-mentioned putting back-end and syringe.

10, syringe according to claim 7 is characterized in that: described push rod front portion has cavity volume (23), has one at push rod apical ring rear portion and stops up (22).