CN2661216Y

CN2661216Y - Safe syringe with telescopic needle (2)

Info

Publication number: CN2661216Y
Application number: CN 200320101563
Authority: CN
Inventors: 谢欣珀; 何其泽; 王识钧
Original assignee: Suide Medical Material Sci & Tech Co Ltd
Current assignee: Suide Medical Material Sci & Tech Co., Ltd.
Priority date: 2003-10-23
Filing date: 2003-10-23
Publication date: 2004-12-08
Anticipated expiration: 2013-10-23

Abstract

The utility model provides a safe syringe with a retractable needle, which comprises a hollow needle cylinder, a push rod inserted into the needle cylinder, a wearing ring and a sleeve ring sleeved with the inserting end of the push rod, and a needle head combined with the front end of the needle cylinder. Wherein, the needle head is combined with the front end of the needle cylinder by a needle head seat. The inner circumferential wall of the needle head seat is provided with a guide slot. A clamping part is formed by inclined extension of the bottom of the guide slot. The circumference of the sleeve ring positioned at front end of the push rod is provided with a lug. When the injection is finished, the sleeve ring is inserted into the needle head seat, the guide slot is combined with the lug, and a clamping state is formed by the lug automatically entering into the clamping part without same axle with the guide slot along the guide slot, and the needle heat seat and the needle head can be retracted into the needle cylinder at the same time by the backward pulling of the push rod. The used sleeve ring and the needle head seat can not be artificially separated, thereby achieving the purpose of not repeatedly using the needle head.

Description

Retractable needle formula safety injector (two)

Technical field

This utility model is a kind of retractable needle formula safety injector, and it is central in order to medium is inputed or outputed the utensil of human body to belong to medical device.

Background technology

For fear of used syringe needle stab medical personnel or the cleaning garbage personnel and cause disease propagation, therefore there is the dealer to design a kind of syringe needle can being used and finishes the safety injector that is retracted to syringe inside afterwards, wherein also is no lack of the monopolist of getting permission, see all each approved safety injector patent cases, be butted on greatly before the push rod of syringe inside and be made as concavo-convex the cooperation (announcing the 35601 No. three " safe syringe " novel patent case) between the bar and needle holder as Taiwan, to finish push rod is pushed into syringe foremost the time in injection, push rod is combined with needle holder, when push rod once again when the pumpback, be about to needle holder together with needle retractable to syringe, with the syringe needle that prevents from the to give prominence to people of stabbing.

But, during actual the use push rod often taking place but is inserted in after the needle holder, but the situation that breaks away from when desiring to retract, it is because needle holder is to omit the elastic colloid of tool, the material characteristic that its utilization can support directly is forced into the push rod front end, yet, when push rod is desired to retract, also might support and cause push rod directly to break away from needle holder by elasticity, otherwise, if when push rod retracts and the needle holder disengaging, and be made as the opening of needle holder less, inner accommodation space is made as bigger, during with the coating degree after improving needle holder and push rod combining, causes push rod to be difficult for pushing the defective of buckle again easily.

And known syringe cylinder, syringe needle after using is not if painstakingly destroy, then push rod and needle holder can be pulled out outside syringe, in artificial mode push rod is separated with needle holder, push rod after the separation and needle holder can be gone to insert in the syringe again and be reused, this and the desired syringe of World Health Organization (WHO) need energy Auto-disable, and promptly not re-usable requirement is run counter to some extent.

Therefore, how to design and a kind ofly can make things convenient for combination, and can strengthen the conjugation of push rod and needle holder, make push rod be able to successfully needle holder be taken out of and can not reusable safety injector, really be the problem of solution that the dealer needs badly.

Summary of the invention

During the technical problems to be solved in the utility model: a kind of retractable needle formula safety injector is provided, this syringe is a kind of conjugation that can bales catch merges and can improve push rod and needle holder, and withdrawing in order to syringe needle again can not reusable safety injector.

Technical solution of the present utility model is: a kind of retractable needle formula safety injector, the syringe, one that comprises a hollow is inserted in push rod in the syringe, be sheathed on the syringe needle that seal ring and that push rod inserts this end is incorporated into the syringe front end, this syringe needle is incorporated into the syringe front end by a needle holder, described push rod is provided with this end face center of seal ring and extends axially a loop bar, and the free end of described loop bar is provided with the catch that radially extends;

One collar, its center are provided with the perforation that is placed on the loop bar and can stressed pivot;

Described needle holder should be provided with a recessed tank in the end center towards syringe inside;

Be provided with the guiding snap-in structure that can make needle retractable between the described collar and needle holder.

Aforesaid a kind of retractable needle formula safety injector, wherein, described guiding snap-in structure comprises:

Be equipped with projection on the periphery wall of the described collar;

Corresponding projection position is provided with the guide groove toward interior extension from the tank opening on the internal perisporium of the tank of described needle holder, and the formation one of the bottom land of described guide groove is formed on edgewise fastening part with the same axis misalignment of guide groove.

Aforesaid a kind of retractable needle formula safety injector, wherein, described cover peripheral wall is provided with the profile groove that runs through both ends of the surface and communicate with perforation.

Be provided with two projections on the internal perisporium of the tank of described needle holder relatively; And

The periphery wall of the described collar is provided with two guide grooves, and towards the past interior extension of this end opening of needle holder, the bottom land formation one of guide groove is formed on edgewise fastening part with the same axis misalignment of described guide groove to guide groove from the collar.

Aforesaid a kind of retractable needle formula safety injector, wherein, described cover peripheral wall is provided with the profile groove that runs through both ends of the surface and communicate with described perforation.

By above-mentioned technological means, when injection finishes and the collar that will be positioned at the push rod front end when being inserted in the tank of needle holder, can be before the guide groove of needle stand and then be equipped in the fastening part by the projection on the collar, in order to push rod needle holder and syringe needle are retracted in the syringe and can not reuse.

In addition, this utility model may further be at contiguous this end of head of the rod body part of push rod and is provided with the less portion of blocking of an external diameter, can fracture from this portion of blocking after the syringe needle withdrawal, avoids syringe needle is released once again.

Characteristics of the present utility model and advantage are: the needle holder internal perisporium of retractable needle formula safety injector of the present utility model is provided with guide groove, the oblique fastening part that extends to form of the bottom land of guide groove, the collar periphery that is positioned at the push rod front end then is provided with projection, when injection finishes, the collar is inserted in the needle holder, projection is involutory in guide groove, projection is entered with the fastening part of the non-same axis of guide groove automatically along guide groove form the button hook state; And the set broken portion of blocking of the rod body part of push rod makes the use of syringe needle safer, thereby overcome the defective of prior art, when push rod back draws, can simultaneously needle holder and syringe needle be retracted in the syringe, and the collar after using can't separate in artificial mode with needle holder, can reach safety, not re-usable purpose.

Description of drawings

Fig. 1 is a three-dimensional appearance sketch map of the present utility model;

Fig. 2 is a perspective exploded view of the present utility model;

Fig. 3 desires push rod to be inserted in the preceding sectional perspective schematic appearance of needle holder for this utility model;

Fig. 4 is incorporated into push rod for this utility model the sectional perspective schematic appearance of needle holder;

Fig. 5 is that this utility model is by the three-dimensional appearance sketch map of push rod with the syringe needle withdrawal;

Fig. 6 is the another kind of sectional perspective schematic appearance of implementing kenel of this utility model.

The drawing reference numeral explanation:

10, syringe 20, push rod 21, joint portion 210, block portion

22, retaining edge 23, loop bar 24, catch 25, head

30, seal ring 40, the collar 41, projection 42, perforation

43, profile groove 44, guide groove 45, fastening part 50, syringe needle

51,51 ', needle holder 510, guide groove 511, fastening part

512,512 ', tank 513, projection

The specific embodiment

See also shown in Figure 1, retractable needle formula safety injector provided by the utility model comprises the syringe 10 of a hollow, one is inserted in the push rod 20 in the syringe 10, be sheathed on the seal ring 30 and a rotatable collar 40 of push rod 20 these ends of insertion, one is incorporated into the syringe needle 50 of syringe 10 front ends, wherein, syringe needle 50 is incorporated into syringe 10 front ends by a needle holder 51, needle holder 51 internal perisporiums are provided with guide groove 510, be positioned at the then corresponding projection 41 that is provided with the guide groove 510 of to plant of the collar 40 peripheries of push rod 20 front ends, when injection finishes, the collar 40 is inserted in the needle holder 51, and make projection 41 enter bottom land to make both form the button hook state along guide groove 510, when push rod 20 back draws, promptly can be simultaneously with in needle holder 51 and the syringe needle 50 retraction syringes 10.

Above-mentioned is general introduction of the present utility model, and its detailed structure is addressed as the back:

See also Fig. 2, shown in Figure 3, described push rod 20 inserts syringe 10 inner these ends and is provided with a columned joint portion 21, use and be nested with described seal ring 30, in the seal ring 30, outer peripheral edges are packed in joint portion 21 respectively, syringe 10 internal perisporiums, to form leak preventing effect, 21 free end face is provided with one and is radially the prominent retaining edge of establishing 22 in the joint portion again, in case throw-out lever 20 is when retracting, seal ring 30 is deviate from by joint portion 21 front ends, described retaining edge 22 end face centers extend axially a loop bar 23, be nested with the end face of loop bar 23 and be provided with the catch 24 that an external diameter can prevent that more greatly the collar 40 from deviating from for the described collar 40;

The described collar 40 is the round bar body that a center has perforation 42, the perisporium of the collar 40 be provided with one run through both ends of the surface and with the perforation 42 profile grooves that communicate 43, be inserted in by the radial position of loop bar 23 and be the pivot joint state for the collar 40, be provided with two projections 41 on the periphery wall of the collar 40 relatively;

Described needle holder 51 should be provided with a recessed tank 512 in the end center towards syringe 10 inside, the internal diameter of tank 512 is greater than the external diameter of the collar 40, on the internal perisporium of tank 512, be provided with two guide grooves 510 relatively, the opening of guide groove 510 is the horn-like of flaring, enter smoothly for projection 41, in addition, guide groove 510 is after tank 512 perisporiums extend axially one section degree of depth, tiltedly extend laterally formation one and the out of line fastening part 511 of guide groove along perisporium again, fastening part 511 is towards this side of guide groove 510 openings and be made as barb-like, make projection 41 fall into after the fastening part 511, when the collar 40 by push rod 20 back during drawing, promptly be equipped on the hook-shaped side of fastening part 511 and can not deviate from.

Above-mentioned is structure of the present utility model, Fig. 3 is please consulted in action during its operation simultaneously, shown in 4, when finishing, injection make the collar 40 on the push rod 20 in the tanks 512 of needle holder 51 during plant, projection on the collar 40 41 is involutory in the opening of guide groove 510, when push rod 20 is continued to push forward, the collar 40 rotates relatively on loop bar 23 and makes projection 41 be able to along guide groove 510 enter the fastening part 511 that is positioned at bottom land, when push rod 20 past pulling back, even projection 41 is snapped on the hook-shaped side of fastening part 511, form splendid bonding state, continuation with push rod 20 when pulling back, promptly as shown in Figure 5 needle holder 51 is retracted in the retraction syringe 10 together with syringe needle 50, because the collar 40 external diameters are less than tank 512 internal diameters of needle holder 51, so after needle holder 51 retractions, can be with projection 41 be fulcrum, syringe needle 50 is tilted because of gravity, be unlikely to pass by syringe 10 front ends again.

Again by Fig. 1 and shown in Figure 5, in order to shorten with finishing depleted push rod 20 length, and avoid push rod 20 inadvertently to be released forward, so be made as the narrower portion of blocking 210 of section in contiguous head 25 these sections of the body of rod of push rod 20, after syringe needle 50 retractions, can fracture from the portion of blocking 210 of push rod 20, make syringe needle 50 be positioned at syringe 10, do not release the anxiety of hurting sb.'s feelings again and have.

From the above, structure of the present utility model can be when injection finishes, allow in moving the collar automatically with needle holder formation blocking, not only easy to operate, can also strengthen its conjugation, do not cause push rod and needle holder to break away from, and after entering the fastening part 511 that is positioned at bottom land because of projection 41, when soon push rod 20 is back pulled out syringe with needle holder 51, be snapped in because of projection 41 on the hook-shaped side of fastening part 511, form splendid bonding state, be difficult for push rod 20 being separated the back with needle holder 51 and reuse, so this utility model can improve known disadvantages and have progressive with artificial strength.

And for example Figure 6 shows that another kind of embodiment of the present utility model, its all members are all identical with aforementioned preferred embodiments, only establish in the tank 512 ' with needle holder 51 ' with two relative projections 513, then be provided with two guide grooves 44 on the collar 40 ' periphery wall towards needle holder 51 ' this end opening, the bottom land of guide groove 44 and be provided with guide groove 44 and be not laterally disposed fastening part 45 at same axis, it can also produce the effect of guiding and button hook.

Claims

1. retractable needle formula safety injector, it is characterized in that: described retractable needle formula safety injector comprises that the syringe, of a hollow is inserted in push rod in the syringe, is sheathed on the syringe needle that seal ring and that push rod inserts this end is incorporated into the syringe front end, this syringe needle is incorporated into the syringe front end by a needle holder, described push rod is provided with this end face center of seal ring and extends axially a loop bar, and the free end of described loop bar is provided with the catch that radially extends;

2, a kind of retractable needle formula safety injector as claimed in claim 1, it is characterized in that: described guiding snap-in structure comprises:

Be equipped with projection on the periphery wall of the described collar;

3. a kind of retractable needle formula safety injector as claimed in claim 2, it is characterized in that: described cover peripheral wall is provided with the profile groove that runs through both ends of the surface and communicate with perforation.

4. a kind of retractable needle formula safety injector as claimed in claim 1, it is characterized in that: described guiding snap-in structure comprises:

5. a kind of retractable needle formula safety injector as claimed in claim 4, it is characterized in that: described cover peripheral wall is provided with the profile groove that runs through both ends of the surface and communicate with described perforation.