CN101564567B

CN101564567B - Injector capable of retracting needle automatically

Info

Publication number: CN101564567B
Application number: CN2009101155009A
Authority: CN
Inventors: 冯伟青
Original assignee: Individual
Current assignee: Individual
Priority date: 2009-06-06
Filing date: 2009-06-06
Publication date: 2012-05-09
Anticipated expiration: 2029-06-06
Also published as: CN101564567A

Abstract

The invention belongs to the field of medical injector, and specially relates to an injector capable of retracting the needle automatically, which comprises a needle barrel, a needle, a push-rod handle and a push-rod body. A piston sealed with an inner wall of the needle barrel is sleeved on the outer circumference at the upper end of the push-rod handle. The push-rod handle is provided on the lower end. The push rod is in a hollow structure. An annular convex shoulder converging inwards is formed on the upper end of the push-rod body. A chuck is disposed on the annular convex shoulder. A blind hole with an opening upward is arranged in the middle of the upper portion of the chuck. An annular concave slot is provided in the middle of the chuck and disposed in the inner cavity of the push-rod body. A spring capable for completely pulling the chuck into the inner cavity of the push-rod body is disposed in the inner cavity of the push-rod body. When the push-rod body is pushed to the bottom of the matched injector needle barrel, the needle of the injector abuts against the chuck, and the upper portion of the chuck is inserted into an end portion of the needle far away from a tip of the needle. The invention is simple in structure, convenient for use, low in cost, easy for large scale production, and suitable for the injector capable of retracting the needle automatically.

Description

But the syringe of automatic whip-back needle

Technical field:

The invention belongs to the injector for medical purpose technical field, but refer in particular to a kind of syringe of automatic whip-back needle.

Background technology:

At present, the medical level of various countries is all progressive day by day, and people are also increasingly high for the emphasis degree of medical care articles for use health.All the time, constantly have to occur in the situation generation of being infected in the process of carrying out medical treatment, no matter be medical personnel or patient; Its route of infection are nothing more than being directly to infect or indirect infection, and wherein, the indirect infection overwhelming majority is because institute's medical apparatus and instruments that uses totally does not cause; As: sterilization not exclusively, not thorough, or the article that should abandon bring repeated use etc., are example with the syringe: syringe is to use one of higher medical apparatus and instruments of frequency in clinical; Also be the medical apparatus and instruments that directly contact with the patient, the syringe of traditional form is after finishing using, through repeated use again after sterilizing; But the disappearance if any in the sterilization then can cause the patient to infect improperly; Therefore, this syringe has been limited to use or progressively be eliminated; To the problems referred to above, just a kind of disposable syringe occurred, this type syringe promptly will abandon after using once, if but do not do thoroughly to handle; Then created condition to the lawless person, caused the danger that reuses, for example some medical institutions partly abandons syringe needle after using for the patient; Syringe part still continues to use, and this is breakneck behavior, though syringe part does not directly contact with the patient; But because in the process of injection medicament, patient's blood but possibly be back in the syringe, relative also possibly bring pathogenic bacteria in the syringe into; In the time of will re-using same syringe and come injection medicament like the next bit patient, pathogenic bacteria possibly caused great infection hidden danger to the patient just along with medicament gets in this patient's body; Cause patient's self rights and interests sustain damage, even jeopardize patient's life, and this type syringe is when abandoning after use; Do not have any protective treatment, easy mistake is stabbed medical personnel or cleanup crew etc., causes another kind to infect improperly and endangers.And now, research and develop the retracting type self-destroyed syringe of appearance to disposable syringe on the market, and all because of complex structure or unreasonablely bring very big difficulty, thereby can not produce in enormous quantities to processing, can not satisfy disposable demand; The spring of the retracting type self-destroyed syringe that occurs on the market simultaneously all is to design on the syringe and syringe needle of syringe, very easily pollutes the position that contacts with liquid medicine, influences safe in utilization.

Summary of the invention:

The purpose of this invention is to provide a kind of simple in structurely, easy to use, cost is low, but is prone to the syringe of automatic whip-back needle of the special injection allocation love dart syringe of processing in enormous quantities.

The present invention is achieved in that

But the syringe of automatic whip-back needle; Comprise that syringe, syringe needle, push rod press hands and pusher body; Be arranged with on the outer circumference surface of the upper end of pusher body and can be provided with push rod with piston, the lower end of syringe inner wall sealing and press hands, pusher body is the structure of a hollow, and toe-in is formed with annular convex shoulder in the upper end of pusher body; The place is provided with dop at annular convex shoulder; There is an annular groove at the middle part of dop and is in the interior intracavity of pusher body, is provided with the spring that can dop be drawn in fully intracavity in the pusher body at the interior intracavity of pusher body, when pusher body is pulled to supporting syringe needle tube bottom; The low dop that leans on of the syringe needle of syringe, dop top is inserted into the end of syringe needle away from needle point.

Above-mentioned spring is arranged between the lower surface of intracavity bottom and dop of pusher body, and is in extended state.

Above-mentioned spring is arranged between the lower surface of intracavity bottom and dop of pusher body: an end of spring is connected the lower end of dop, and the other end of spring is connected the lower end of pusher body.

The top of above-mentioned dop is provided with opening blind hole up between two parties, is provided with sealing ring between the annular groove of dop and the annular convex shoulder of pusher body.

The present invention compares the outstanding advantage of prior art:

1, the present invention is simple in structure, and is easy to use, and cost is low, is prone to processing in enormous quantities;

2, after the present invention and syringe, the supporting use of syringe needle, both be in the damage state, thereby prevented reuse once more, needle point is covered by the Tibetan, prevented that needle point from stabbing and the situation generation of subinfection again, reached the purpose of safe handling;

3, the present invention is suitable for the syringe of automatic whip-back needle.

Description of drawings:

Fig. 1 is the structural representation of push rod of the present invention;

Fig. 2 is the state diagram before injector syringe, the syringe needle supporting with the present invention uses;

Fig. 3 is the state diagram after injector syringe, the syringe needle supporting with the present invention uses.

The specific embodiment:

With specific embodiment the present invention is further described below, referring to Fig. 1-3:

But the syringe of automatic whip-back needle; Comprise that syringe, syringe needle, push rod press hands 1 and pusher body 2; Be arranged with on the outer circumference surface of the upper end of pusher body 2 and can be provided with push rod with piston 6, the lower end of syringe 8 inner wall sealings and press hands 1, pusher body 2 is the structure of a hollow, and toe-in is formed with annular convex shoulder 21 in the upper end of pusher body 2; 21 places are provided with dop 3 at annular convex shoulder; There is an annular groove 32 at the middle part of dop 3 and is in the interior intracavity of pusher body 2, is provided with the inner chamber inner spring 5 that can dop 3 be drawn in fully pusher body 2 at the interior intracavity of pusher body 2, when pusher body is pulled to supporting syringe needle tube bottom; The low dop that leans on of the syringe needle of syringe, dop top is inserted into the end of syringe needle away from needle point.

Above-mentioned spring 5 is arranged between the lower surface of intracavity bottom and dop 3 of pusher body 2.

Above-mentioned spring 5 is arranged between the lower surface of intracavity bottom and dop 3 of pusher body 2: an end of spring 5 is connected the lower end of dop 3, and the other end of spring 5 is connected the lower end of pusher body 2.

The top of above-mentioned dop 3 is provided with opening blind hole 31 up between two parties, is provided with sealing ring 4 between the annular groove 32 of dop 3 and the annular convex shoulder 21 of pusher body 2.

The present invention uses with supporting with it syringe 7 and syringe needle 8, and hands promotes pusher body 2 by pressing at push rod on the hands 1, when pusher body 2 is pulled to supporting injector syringe 7 bottoms; The syringe needle 8 conflict dops 3 of syringe make dop 3 draw in the inner chamber of pusher body 2, like this with the spring 5 that syringe needle 8 is in extended state; Thereby both be in the damage state after syringe is used and prevented reuse once more; Needle point 81 is hidden covered, prevent that needle point 81 from stabbing the generation of phenomenon, reach safe condition.

Claims

1. but the syringe of automatic whip-back needle; Comprise that syringe, syringe needle, push rod press hands and pusher body, be arranged with on the outer circumference surface of the upper end of pusher body and can be provided with push rod with piston, the lower end of syringe inner wall sealing and press hands that it is characterized in that: pusher body is the structure of a hollow; Toe-in is formed with annular convex shoulder in the upper end of pusher body; The place is provided with dop at annular convex shoulder, and the top of dop is provided with opening blind hole up between two parties, and there is an annular groove at the middle part of dop and is in the interior intracavity of pusher body; Interior intracavity at pusher body is provided with the spring that can dop be drawn in fully intracavity in the pusher body; An end that is in the spring of extended state is connected the lower end of dop, and the other end of spring is connected the lower end of pusher body, when pusher body is pulled to supporting syringe needle tube bottom; The syringe needle of syringe is against dop, and dop top is inserted into the end of syringe needle away from needle point.

2. but the syringe of automatic whip-back needle according to claim 1 is characterized in that: be provided with sealing ring between the annular groove of described dop and the annular convex shoulder of pusher body.