CN201324420Y

CN201324420Y - Disposable injector

Info

Publication number: CN201324420Y
Application number: CNU200820214822XU
Authority: CN
Inventors: 宣庆弟; 王明辉
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-09
Filing date: 2008-12-09
Publication date: 2009-10-14
Anticipated expiration: 2018-12-09

Abstract

The utility model relates to a disposable injector which belongs to the technical field of a medical appliance. The disposable injector comprises a push rod, a needle cylinder and a needle head seat. A piston is arranged at the front end of the push rod, the needle cylinder is inserted into the piston of the push rod, and the needle head seat is arranged at the front end of the needle cylinder. A barb cavity is arranged at the front end of the push rod, and the needle head seat is provided with a barb which is matched with the barb cavity; wherein a first clamping groove is arranged in an inner hole at the front end of the needle cylinder; the needle head seat is mainly composed of a wedge clamping sleeve, a needle head body and a barb head; a first wedge convex which is closely matched with the first clamping groove is arranged at the outer circle of the wedge clamping sleeve, and a second clamping groove is arranged at the inner hole; a second wedge convex which is closely matched with the second clamping groove is arranged at the outer circle of the needle head body, and a third clamping groove is arranged at the inner hole; and a third wedge convex which is closely matched with the third clamping groove is arranged at the outer circle of the bard head. The disposable injector breaks through the traditional method of injecting from the rear end, does not need auxiliary tools, and is easy to ensure the assembling quality. Besides, moulds of various parts of the needle head seat are simple, and the manufacturing process is simple as well as convenient. The force of drawing back the push rod is smaller than that of resisting puncture, the hand feeling is good and the operation is convenient.

Description

Disposable syringe

Technical field

This utility model relates to a kind of syringe, and especially a kind of disposable syringe belongs to technical field of medical instruments.

Background technology

Disposable syringe can guarantee safe and sanitary, therefore is subjected to extensive concern.Retrieval finds, application number is that 00205827.8 Chinese patent application, application number that is called " self-destroy safety injector " is 03256401.5 and is called that Chinese patent application, the application number of " a kind of safety injector of a kind of safety injector " are that 03108825.2 Chinese patent application, application number that is called " syringe " is 03121930.6 and is called that the Chinese patent application of " a kind of safety injector " discloses four kinds of disposable syringes of being made up of syringe, syringe needle, needle holder, sealing ring, piston, core bar etc. respectively.All there is following shortcoming in these syringes: 1) needle holder all must be packed into from back end of syringe, and is very inconvenient, usually need be by aid, so assembly quality is affected easily; Active force when 2) active force of piston push rod approximates the opposing puncture during needle holder pumpback, effort comparatively, operating handle is bad during use.

The utility model content

The purpose of this utility model is: the shortcoming at above prior art exists proposes a kind of assembling disposable syringe very easily, thereby is convenient to guarantee assembling quality.

In order to reach above purpose, disposable syringe of the present utility model comprises that front end is equipped with the push rod of piston, the syringe that inserts push-rod piston and the needle holder that is installed in the syringe front end; The front end of described push rod is shaped on barb hollow, and described needle holder is shaped on the barb that matches with described barb hollow; Wherein be shaped on first draw-in groove in the front end endoporus of syringe; Needle holder mainly is made up of wedge cutting ferrule, needle head body and the barb head of mutual plug-in mounting; The cylindrical of described wedge cutting ferrule forms with friction tight first wedge of described first draw-in groove protruding, and endoporus is shaped on second draw-in groove; The cylindrical of described needle head body forms with friction tight second wedge of described second draw-in groove protruding, and endoporus is shaped on the 3rd draw-in groove; The cylindrical of described barb head is shaped on friction tight the 3rd wedge of described three-flute protruding.

During assembling, needle head body is inserted in the endoporus of described wedge cutting ferrule, make the protruding wedging second draw-in groove wedging of second wedge, again barb head is inserted in the endoporus of needle head body, make protruding wedging the 3rd draw-in groove wedging of the 3rd wedge, at last the needle holder that combines is inserted in its endoporus by the syringe front end, made the protruding wedging first draw-in groove wedging of first wedge.Whole assembling process has been broken traditional rear end load mode, need not aid, accomplishs without any letup, and is very convenient, is easy to guarantee assembling quality.And each component part mould of needle holder is simple, and manufacturing process is easy.During the pumpback push rod firmly less than the opposing puncture time active force, good hand touch is convenient to control.

It is that described the 3rd draw-in groove and the protruding matching allowance of the 3rd wedge and described first draw-in groove and the protruding matching allowance of first wedge are greater than described second draw-in groove and the protruding matching allowance of second wedge that this utility model further improves.In the time of can guaranteeing the push rod pumpback like this, needle holder integral body is returned in the syringe because of overhead structure.

Description of drawings

Below in conjunction with accompanying drawing this utility model is further described.

Fig. 1 is the three-dimensional detaching structure sketch map of this utility model embodiment one.

Fig. 2 is the broken section enlarged drawing at A place among Fig. 4.

Fig. 3 is the broken section enlarged drawing at B place among Fig. 4.

Fig. 4 is the package assembly sketch map of this utility model embodiment two.

Fig. 5 is the structural representation after the pumpback of Fig. 2 embodiment push rod.

The specific embodiment

Embodiment one

The disposable syringe of present embodiment as shown in Figure 1, plug-in mounting push rod 8 in the syringe 6.The nose circle title of push rod 8 middle part is shaped on the barb hollow 8-1 of biasing, forms claw-like, as shown in Figure 2, sagittate barb hollow summit secundly, one of formed two pawls deflection push rod to the one-tenth center.Have in the barb of this biasing and needle holder can be drawn automatically inclined to one side effect (referring to Fig. 2 and Fig. 5), be convenient to when the push rod rollback, make syringe needle to drop on (elastic force of biasing pawl can force the related needle stand of pin pedestal off-center together, drops in the syringe) in the syringe.Piston 7 plug-in cards are at the round platform head place of push rod 8.

Be shaped on first draw-in groove in the front end undergauge endoporus of syringe 6.Needle holder mainly is made up of wedge cutting ferrule 1, needle head body 3 and barb head 5.The cylindrical of wedge cutting ferrule 1 clamps sealing ring 2, and formation is protruding with friction tight first wedge of first draw-in groove, and endoporus is shaped on second draw-in groove.The cylindrical of needle head body 3 clamps sealing ring 4, and formation is protruding with friction tight second wedge of second draw-in groove, and endoporus is shaped on the 3rd draw-in groove.The cylindrical of barb head 5 is shaped on friction tight the 3rd wedge of three-flute protruding.The endoporus of wedge cutting ferrule 1 is pre-small post-large taper hole, and the cylindrical of needle head body 5 has the tapering that this taper hole matches.The protruding matching allowance of first wedge that the 3rd draw-in groove and the protruding matching allowance of the 3rd wedge and first draw-in groove and sealing ring 2 form is greater than the protruding matching allowance of second wedge of second draw-in groove and sealing ring 4 formation.In the time of can guaranteeing the push rod pumpback like this, needle head body is deviate from (referring to Fig. 5) from the wedge cutting ferrule.

During assembling, the needle head body 5 that clamps sealing ring 4 is inserted wedging in the taper hole of wedge cutting ferrules 1, again barb head 5 is inserted in the endoporus of needle head body, by wedge protruding with the draw-in groove wedging, needle holder is combined into one, again sealing ring 2 is installed on outside the wedge cutting ferrule 1.To insert in the undergauge endoporus of needle holder that combine at last, make the first draw-in groove wedging in the sealing ring 2 wedging taper holes by the syringe front end.Like this, change traditional rear end load mode, need not aid, be easy to guarantee assembling quality.Draw-in groove and wedge are protruding can to guarantee locking, and sealing ring itself has then guaranteed sealing.

In addition, push rod 8 middle parts of present embodiment are shaped on the breach 8-2 that forms stress concentration, and (referring to Fig. 5) when being convenient to extract push rod out after injection fractures it.Extend laterally out catch 8-3 easy to break (referring to Fig. 3) before the push pedal 8-4 of push rod 8 rear ends, the outer end of the contiguous push rod of the junction point of catch 8-3 easy to break and push rod 8.One end of the contiguous syringe of catch easy to break forms the anti-skidding flange.It must be fractureed before the injection and could advance push rod, guarantee to be injected under the concentrated condition of attention and carry out.

Embodiment two

The disposable syringe of present embodiment as shown in Figure 4, its basic structure is identical with embodiment one.Difference is that as shown in Figure 2, the cylindrical front end of wedge cutting ferrule 1 extends to form with friction tight first wedge of first draw-in groove protruding.The cylindrical rear end of needle head body extends to form with friction tight second wedge of second draw-in groove protruding.The cylindrical front end of barb head extends to form with friction tight the 3rd wedge of three-flute protruding.First draw-in groove and the protruding matching allowance of first wedge and the 3rd draw-in groove and the protruding matching allowance of the 3rd wedge are greater than second draw-in groove and the protruding matching allowance of second wedge.Like this, number of spare parts still less, structure is simpler and more direct.Each wedging face can have the tapering that matches, the sealing between so more helping mutually.

In a word, facts have proved that the disposable syringe of above embodiment has following outstanding advantage:

1, needle holder is front loaded from syringe, assembles very convenient;

2, three pairs of wedging structures organically combine, and intermediary taper hole structure makes the pumpback core bar to break away from moment;

3, behind the pumpback core bar, core bar termination biasing barb hollow will force needle holder to be tilted in the syringe together with syringe needle, can't release use once more.

In addition to the implementation, this utility model can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of this utility model requirement.

Claims

1. a disposable syringe comprises that front end is equipped with the push rod of piston, the syringe that inserts push-rod piston and the needle holder that is installed in the syringe front end; The front end of described push rod is shaped on barb hollow, and described needle holder is shaped on the barb that matches with described barb hollow; It is characterized in that: be shaped on first draw-in groove in the front end endoporus of described syringe; Needle holder mainly is made up of wedge cutting ferrule, needle head body and the barb head of mutual plug-in mounting; The cylindrical of described wedge cutting ferrule forms with friction tight first wedge of described first draw-in groove protruding, and endoporus is shaped on second draw-in groove; The cylindrical of described needle head body forms with friction tight second wedge of described second draw-in groove protruding, and endoporus is shaped on the 3rd draw-in groove; The cylindrical of described barb head is shaped on friction tight the 3rd wedge of described three-flute protruding.

2. disposable syringe according to claim 1 is characterized in that: described the 3rd draw-in groove and the protruding matching allowance of the 3rd wedge and described first draw-in groove and the protruding matching allowance of first wedge are greater than described second draw-in groove and the protruding matching allowance of second wedge.

3. disposable syringe according to claim 2 is characterized in that: the endoporus of described wedge cutting ferrule is pre-small post-large taper hole, and the cylindrical of described needle head body has the tapering that described taper hole matches.

4. disposable syringe according to claim 3 is characterized in that: the nose circle title middle part of described push rod is shaped on the barb hollow of biasing.

5. disposable syringe according to claim 4 is characterized in that: the cylindrical of described wedge cutting ferrule clamps first sealing ring, forms with friction tight first wedge of first draw-in groove protruding; The cylindrical of described needle head body clamps second sealing ring, forms with friction tight second wedge of second draw-in groove protruding.

6. disposable syringe according to claim 4 is characterized in that: the cylindrical front end of described wedge cutting ferrule extends to form with friction tight first wedge of first draw-in groove protruding; The cylindrical rear end of described needle head body extends to form with friction tight second wedge of second draw-in groove protruding.

7. according to claim 5 or 6 described disposable syringes, it is characterized in that: described push rod middle part is shaped on the breach that forms stress concentration.

8. disposable syringe according to claim 7 is characterized in that: described putting back-end extends laterally out catch easy to break, the outer end of the contiguous described push rod of the junction point of described catch easy to break and push rod.

9. disposable syringe according to claim 8 is characterized in that: an end of the contiguous syringe of described catch easy to break forms the anti-skidding flange.