CN201030119Y

CN201030119Y - Safety syringe with the needle backing automatically

Info

Publication number: CN201030119Y
Application number: CNU200720000735XU
Authority: CN
Inventors: 董忠浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2007-02-14
Filing date: 2007-02-14
Publication date: 2008-03-05
Anticipated expiration: 2017-02-14

Abstract

The utility model relates to a safe injector which whips-back a needle head automatically, comprising a syringe of a clamping portion which is arranged at the inner portion of the front end, and a needle base which is combined at the front end of the syringe through the clamping portion, the upper end of the center of the needle base is provided with a needle head fixing portion, and the lateral wall is provided with a plurality of vertical walking rail tracts at equal interval and a plunger push rod which is a hollow pole body whose inner portion is a storehouse which takes negative pressure, the front end is provided with a diameter shrinkage opening, and a ring-shaped slot is formed at the periphery of the opening, and a piston coats the opening at the front end of the pole body and the outer wall at the front end. When the plunger push rod is pushed to the front end of the syringe and pierces and cut off the piston, the plunger push rod is deformed through the clamping portion, and the clamping portion of the needle base gets loose. So the storehouse is communicated with the outside, thereby the released needle base and the connected needle head change with pressure and are sucked in the plunger push rod.

Description

The safety injector of automatic whip-back needle

Technical field

This utility model relates to syringe construction, is meant a kind of safety injector of automatic whip-back needle especially.

Background technology

In the process of medical treatment, injectable drug arrives on one's body the patient, with disease controlling, be a kind of common medical act, and become the quickest and effective medical act with the injector to inject medicament, and widely medical circle adopts.Exhausted syringe needle is because of contacted patient, if if patient's disease is the tool infectivity, then contacted patient's syringe needle has infectivity equally, must be quite careful, careful so handle described kind of syringe needle, stabbed by the infective syringe needle of tool to avoid medical personnel or offal treatment personnel.

As shown in Figure 8, the syringe needle b of early stage syringe a only sets up a lid c with its fit, and the personnel that prevent are stabbed by it.Yet described lid c cooperates syringe needle b and establishes, and the running-on of described lid c is also quite narrow, and user often must be aimed at syringe needle b and syringe needle b could be entangled.Therefore, for safeguarding healthcare givers's safety, so the generation of designs such as the syringe of multiple haulback type syringe needle or injection needle protective construction is arranged.As shown in Figure 9, so-called haulback type syringe d promptly is when the healthcare givers pushes the summit with the plunger f of syringe e, syringe needle g can be retracted in the syringe e, can dispose the depleted syringe of desire safely.

Though, but still have following shortcoming though the safety syringe-drum of haulback type syringe needle on the market can reach the purpose that syringe needle is retracted syringe now:

1, the design of the safety syringe-drum of haulback type syringe needle now, it mainly is that design has the member of clip (as the pull hook and the sour jujube of pulling) mutually between needle stand or plunger, make when the piston of plunger is pulled to the end, the hook of pulling is able to easily and the mutual rank of the sour jujube of pulling is closed and detain knot each other, then can be in syringe needle retracts syringe after both detain knot with needle stand, not only very complicated in its structural design and the manufacturing, its cost also relatively improves.

2, in use, the healthcare givers must with the hands can be with needle stand in syringe needle be returned to syringe, if the improper application of force also might directly be pulled out plunger together with syringe needle, use inconvenience and dangerous, and after in syringe needle is drawn back into syringe, if abandon arbitrarily or because of offal treatment personnel's carelessness, plunger is pushed ahead, then syringe needle will be pushed out outside the syringe again, and lose the meaning of haulback type design.

3, the safety syringe-drum of Hui Lashi syringe needle is after use now, and the most volume of its plunger is because of pulling out the cause of syringe, and exposedly causes its entire length to be uprushed outside, and increases the volume of processing when abandoning.

In view of this, this utility model designer develops a kind of safety injector of automatic shortening head, to solve the ubiquitous shortcoming of safety syringe-drum of above-mentioned now haulback type syringe needle.

Summary of the invention

Main purpose of the present utility model is to provide a kind of suction and thrust of utilizing pressure differential to produce, makes syringe needle partly be bounced back to the safety injector of the automatic whip-back needle in the plunger push rod automatically.

Another purpose of the present utility model is to provide a kind of simple in structure, easy to operate and syringe needle not have the safety injector of the automatic whip-back needle of the safety problem of deviating from syringe again.

For reaching the purpose of above-mentioned utility model, this utility model provides a kind of safety injector of automatic whip-back needle, comprises that front end inside has the syringe of a clamping part; Be combined in a needle stand of described syringe front end by described clamping part, described needle stand upper end in the central is provided with a syringe needle fixed part, and equidistantly is provided with a plurality of tracks of indulging away on its sidewall; And be a plunger push rod of hollow lever, its inside is the bin that is negative pressure, and its front end has a footpath opening that contracts, and form an annular incision at described opening periphery, and and coat the front opening and the front end outer wall of the described body of rod with a piston.After described plunger push rod being pushed to syringe front end and puncture and being blocked described piston, the distortion that makes via the described clamping part of extruding, and described needle stand is got loose from described clamping part, described bin is communicated with the external world, and then make the needle stand of disengaging be able to be inhaled in described plunger push rod because of pressure changes together with banded syringe needle.

Therefore, this utility model really has following advantage:

1, this utility model can provide a kind of safety injector of automatic whip-back needle, and the piston that wherein is coated on plunger push rod front opening and the front end outer wall is integrally formed, can effectively reduce material and assembly cost.

2, this utility model also can provide a kind of safety injector of automatic whip-back needle, and wherein said plunger push rod front opening periphery is to form an annular incision, can effectively cut off and isolation piston; And described otch is the design of contracting in, can guarantee that the described needle stand that breaks away from because of distortion is to enter in the plunger push rod, and not cause syringe needle to drop in the syringe because of pulling back.

3, this utility model can provide a kind of safety injector of automatic whip-back needle in addition, wherein be arranged on the design of two lobes in the clamping part of syringe front end, must allow needle stand and syringe combine closely in use, and behind EO, only need simple and easy exerting pressure that described needle stand is effectively separated with described clamping part disengagement.

4, this utility model can provide a kind of safety injector of automatic whip-back needle in addition, wherein piston is circular arc design towards the surface of plunger push rod inside, so circular arc design can make plunger push rod internal negative pressure produce isostatic expansion pressure, and reach obturation effect.

5, this utility model can provide a kind of safety injector of automatic whip-back needle in addition, wherein said piston partly is to contact with described plunger push rod bin medial wall with a plurality of projectioies being positioned at described plunger push rod front opening inboard, by its projection contact, be able to the intercepted piston of more smooth suction together with the needle stand that has syringe needle.

Description of drawings

Fig. 1 is the three-dimensional appearance exploded view of this utility model embodiment;

Fig. 2 is the generalized section after this utility model embodiment combination;

Fig. 3 is this utility model contains medicament in conjunction with embodiment syringe before injection of syringe needle a generalized section;

Fig. 4 is the view that this utility model embodiment annular incision pierces through piston;

Fig. 5 is the view that needle stand breaks away from from clamping part among this utility model embodiment;

Fig. 6 is that needle stand is inhaled into view in the plunger push rod together with syringe needle among this utility model embodiment;

Fig. 7 is the stereo appearance figure of plunger push rod among this utility model embodiment;

Fig. 8 is the stereo appearance figure of existing pinhead sleeve unification lid;

Fig. 9 is existing haulback safety syringe with pull back user mode sketch map to syringe of syringe needle.

Description of reference numerals: 1-syringe; 331,331 '-annular incision; The 11-clamping part; The 34-piston; The 111-bottom; The 341-depressed part; The 112-holder; The 342-arc surface; The 2-needle stand; The 343-projection; 21-syringe needle fixed part; The a-syringe; The 22-track; The b-syringe needle; The 23-bottom; The c-lid; The 24-syringe needle; D-haulback type syringe; 3-plunger push rod; The e-syringe; The 31-bin; The f-plunger; 32-front end outer wall; The g-syringe needle; The 33-opening.

The specific embodiment

This utility model provides a kind of safety injector of automatic whip-back needle, comprises that front end has the syringe 1 of a clamping part 11; One needle stand 2, it is to be combined in described syringe 1 front end by described clamping part 11, and described needle stand 2 is provided with a syringe needle fixed part 21 in the upper end in the central, and equidistantly is provided with a plurality of tracks 22 of indulging away on its sidewall; An and plunger push rod 3, it is a hollow lever, and its inside is the bin 31 that is negative pressure, has the footpath opening 33 that contracts at front end, and form an annular incision 331, and coat the front opening 33 and the front end outer wall 32 of the described body of rod with a piston 34 at described opening periphery.

See also Fig. 1, Fig. 2, diagramatic content is an embodiment of the safety injector of this utility model automatic whip-back needle, and it is by a syringe 1, a needle stand 2, formed with a plunger push rod 3.

Described syringe 1 is a hollow tube, its front end inside is provided with a clamping part 11, and described clamping part 11 comprises a bottom 111 and a holder 112, and wherein said bottom 111 is in order to support described needle stand 2, then can clamp described needle stand 2 by described holder 112.Described holder 112 has two circular highlights, so can be with described needle stand 2 fluid-tight engagement wherein.

And described needle stand 2 can external syringe needle 24, and it comprises that a syringe needle fixed part 21, a plurality of projection indulge away a track 22 and a bottom 23.Described syringe needle fixed part 21 is arranged on the central authorities upper end of described needle stand 2, is used for an external syringe needle 24; Described a plurality of projection is indulged away the sidewall that track 22 then is arranged on described needle stand 2, and the described track 22 of indulging away is equidistantly to be arranged on the described sidewall.

Described plunger push rod 3 is a hollow lever, for being enclosed within the syringe 1, can move forward and backward to draw and liquid medicine injection.Described body of rod inside is the bin 31 that is negative pressure, and described lever front end has a footpath opening 32 that contracts, and then forms an annular incision 331 at described opening periphery.And the front end outer wall 32 of the described front opening 33 and the described body of rod is to coat with a piston 34, and described piston 34 also extends into the inside of described plunger push rod 3 via described front opening 33.Described piston 34 is to be designed to a circular arc towards the surface 342 of described plunger push rod 3 inboards, and so the design of circular arc can make the negative pressure of described bin 31 inside produce isostatic expansion pressure, and reach preferable airtight effect.In addition, to be positioned at the inboard of described plunger push rod 3 front openings 33 partly be to contact with described plunger push rod 3 bins 31 medial walls with a plurality of protruding 343 to described piston 34.

See also Fig. 3～Fig. 6.When implementing, syringe needle 24 via the syringe needle fixed part that is connected on described needle stand 2 outward, to be housed in that injecting liquid drug in the described syringe 1 finishes and after syringe detached the patient, as shown in Figure 4, when described plunger push rod 3 continuation were promoted toward syringe 1 preceding extreme direction, the depressed part 341 of described piston 34 at first combined with the bottom 23 of described needle stand 2.Continue the described plunger push rod 3 of forward impelling, when being coated on piston 34 on described plunger push rod 3 front openings 33 and the front end outer wall 32 with after described clamping part 11 bottoms 111 contact, force described plunger push rod 3 to move on if continue the application of force, 331 of annular incision that then are positioned at described plunger push rod 3 front opening peripheries can pierce through forward and block described piston 34.At the same time, for the exerting pressure of described clamping part 11 bottoms 111, interlock is made described holder 112 distortion, clamping needle stand 2 is thereon broken away from thereupon by described annular incision 331.At this moment, via described annular incision 331 for described piston 34, the destruction of described clamping part 11, distortion, 31 states that communicate with extraneous formation of the bin of described plunger push rod 3 tool negative pressure, as shown in Figure 5, because ambient pressure is greater than the pressure in the bin 31, this between the two pressure differential can form the strength from extraneous promotion to bin 31 in.So, as shown in Figure 6, utilize described pressure differential the described needle stand 2 that breaks away from because of distortion can be sucked in the described plunger push rod 3.

In addition, when described needle stand 2 is pushed past described stopper rod body 3 inside via pressure differential,, so, can make described needle stand 2 mobile toward described stopper rod body 3 inside more smooth-goingly because described needle stand 2 sidewalls are provided with a plurality of tracks 22 of indulging away.And described piston partly is to contact with described plunger push rod bin medial wall with a plurality of projectioies being positioned at described plunger push rod front opening inboard, by its projection contact, also be able to the intercepted piston of more smooth-going suction together with the needle stand that has syringe needle.

In addition, the design of contracting in the annular incision 331 by described plunger push rod 3 must be guaranteed that the described needle stand 2 that breaks away from because of distortion enters in the described plunger push rod 3, and not cause syringe needle to drop in the syringe 1 because of pulling back after cut off described piston 34.In addition, the bottom 23 by described needle stand 2 can with the design of piston 34 depressed parts 341 be combined into one, also can with the collaborative effect that reclaims automatically that produces of the negative pressure of bins 31 in the described plunger push rod 3.

In addition, as shown in Figure 7, annular incision 331 ' of described plunger push rod 3 front openings 33 peripheries also can be a jagged otch, to provide for the better dissection of described piston 34.

In sum, according to the content that is above disclosed, this utility model really can reach the intended purposes of utility model, a kind of suction and thrust of utilizing pressure differential to produce is provided, syringe needle is partly bounced back in the plunger push rod automatically, and simple in structure, easy to operate and syringe needle does not have the safety injector of the automatic whip-back needle of the safety problem of deviating from syringe again.

More than explanation is just illustrative for this utility model, and it is nonrestrictive, those of ordinary skills understand, under the situation of the spirit and scope that do not break away from claim and limited, can make many modifications, variation or equivalence, but but all will fall within the claim restricted portion of the present utility model.

Claims

1. the safety injector of an automatic whip-back needle is characterized in that: comprise;

One syringe is a hollow tube, and its front end inside has a clamping part;

One needle stand is firmly to be combined in described syringe front end by described clamping part, and described needle stand upper end is provided with a syringe needle fixed part that is used for linking syringe needle; And

One plunger push rod, it is a hollow lever, be set within the syringe, can move forward and backward to draw and liquid medicine injection, described body of rod inside is the bin that is negative pressure, and described lever front end has a footpath opening that contracts, and forms an annular incision at described opening periphery, and coats the front opening and the front end outer wall of the described body of rod with a piston.

2. the safety injector of automatic whip-back needle according to claim 1, it is characterized in that: described piston is an arc surface towards the surface of bin.

3. the safety injector of automatic whip-back needle according to claim 1, it is characterized in that: described clamping part more comprises a bottom and a holder.

4. the safety injector of automatic whip-back needle according to claim 1, it is characterized in that: described needle stand is provided with a plurality of projectioies at its sidewall and indulges away track, and the described track of indulging away is equidistantly to be arranged on the described sidewall.

5. the safety injector of automatic whip-back needle according to claim 1, it is characterized in that: it partly is to contact with described plunger push rod bin medial wall with a plurality of projectioies that described piston is positioned at described plunger push rod front opening inboard.

6. the safety injector of automatic whip-back needle according to claim 1, it is characterized in that: described piston has a depressed part towards the side of syringe inside, when pushing described plunger push rod to the syringe front end, described depressed part combines with the bottom of described needle stand.

7. the safety injector of automatic whip-back needle according to claim 1, it is characterized in that: described annular incision is a zigzag incision.