CN101745165A

CN101745165A - Injector

Info

Publication number: CN101745165A
Application number: CN200810183227A
Authority: CN
Inventors: 方振熠
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-12-16
Filing date: 2008-12-16
Publication date: 2010-06-23

Abstract

The invention discloses an injector. Mainly a convex hole of a choke section at the front end of an injection tube is sleeved with a joint sleeve. The joint sleeve is provided with a combination section and an oblique cone section. A limit component extends from the inner surface of the joint of the combination section and the oblique cone section. The limit component comprises more than two root parts arranged at interval. Ring flanges with a slightly large diameter extend on the lower parts of the root parts. An opening which is slightly narrower than a tenon at the front end of a push rod is surrounded by the ring flanges. The diameter width of the root parts is less than that of the ring flanges, thus, the limit component has larger elastic deformation space so that the process that the push rod is inserted into the joint sleeve is more labor-saving and smoother.

Description

A kind of syringe

Technical field

The present invention relates to a kind of syringe, particularly a kind of push rod penetrates the laborsaving syringe smoothly of clutch collar process.

Background technology

Syringe is an auxiliary appliance indispensable on the medical procedures, and for avoiding causing disease propagation because of reusing syringe needle, syringe now all adopts disposable, uses with the secondary of stopping syringe.

For this reason, before also having relevant patent once to file an application, is AU2006100012 as the patent No., and the open date is on April 6th, 2006, and Australian Patent discloses a kind of " safety injector ".But the inventor finds that the safety injector of before having got permission does not improve part in addition and is after repeatedly using:

Please refer to the disclosed content of AU2006100012 safety injector, the set taper hole (Tapered hole) of its clutch collar (Sleeve) is around forming by plural buckling piece (Buckle), and the shape of this buckling piece is the shape that is wide, therefore when tenon (Tenon) penetrates the taper hole, because this buckling piece is wide shape, its elastic force is relatively poor like this, and causes tenon can't insert easily in the taper hole, and necessity of improvement is obviously arranged.

Summary of the invention

Main purpose of the present invention is in order to provide a kind of push rod to cover laborsaving, the syringe smoothly of card with engaging.

The syringe that provides for achieving the above object mainly is to have extended axially one down in the mode that trims the holding part wall to place restrictions on member between adapter section and oblique conical section, this is placed restrictions on member and includes the root that a plurality of intervals are provided with, the free end of root then forms one, and to have a ring of big external diameter protruding, and this ring is protruding then to be enclosed structure and go out an opening that slightly is narrower than push rod front end tenon; Widely by above-mentioned root footpath slightly be narrower than the protruding design of ring, make this place restrictions on member and have bigger elastic deformation space, it is more laborsaving, smooth and easy to make tenon penetrate the process of clutch collar.

Description of drawings

Fig. 1 is the exploded view of preferred embodiment of the present invention;

Sectional view when Fig. 2 partly pushes in the room for the push rod of preferred embodiment of the present invention;

Fig. 2 A is the schematic cross section of the oblique conical section of preferred embodiment of the present invention;

Fig. 2 B is an enlarged diagram of placing restrictions on the member part embodiment illustrated in fig. 2;

Sectional view when Fig. 3 pushes in the room for the push rod of preferred embodiment of the present invention fully.

Description of reference numerals:

10: injection tube 321: snap ring

11: the section of bringing together 33: clutch collar

111: card tongue 331: adapter section

12: the holder section of finger 332: oblique conical section

13: room 333: ring groove

14: prominent hole 334: runner

141: horn mouth 335: place restrictions on member

15: draw-in groove 336: opening

20: push rod 337: block protruding

22: press finger 338: jut

23: joint portion 339: root

24: tenon 340: encircle protruding

25: elastic piston 34:O type ring

31: needle tubing 35: lid

32: the needle tubing seat

The specific embodiment

The present invention relates to a kind of syringe, please refer to Fig. 1, this syringe includes:

One injection tube 10, it is a hollow cylindrical body, the one end is formed with the section of bringing together 11 of a convergent, it is held then to be formed with in addition and is the holder section of finger 12 that enlarges shape, and injection tube 10 inside are formed with a room 13, the section of bringing together 11 inside then are formed with the prominent hole 14 of this room 13 of connection, be somebody's turn to do the aperture of the aperture in prominent hole 14 less than room 13, then be formed with the retaining edge at less prominent hole 14 joining places of room 13 and aperture, and columned prominent hole 14 then is formed with a horn mouth 141 that is gradually-reducing shape near an end of rooms 13, should cooperate this horn mouth 141 to form a funnel-form in prominent hole 14, be equipped with a draw-in groove 15 at the section of bringing together 11 inwalls, more particularly, this draw-in groove 15 is located at the junction of prominent hole 14 and horn mouth 141;

One push rod 20, in the movable room 13 that is plugged in injection tube 10, and can in room 13, do the linear reciprocation slippage, the tail end of this push rod 20 be formed with one be enlarge shape by finger 22, its front end then is formed with one by several joint portions that disk body constituted 23 that is provided with at interval, these joint portion 23 front ends then are extended with a tenon 24, other has an elastic piston 25 is to wear this tenon 24 and be fixed on this joint portion 23, also promptly this tenon 24 is axially to protrude outside elastic piston 25, and this elastic piston 25 is tight against at room 13 sidewalls;

One needle set group comprises a needle tubing 31, a needle tubing seat 32 and a rubber clutch collar 33, wherein:

This needle tubing 31 plugs and is fixed on needle tubing seat 32, is formed with the round clasp 321 of an outer expanding shape at needle tubing seat 32 appropriate locations, uses for lid 35 upper shields.Below snap ring 321, then be provided with an external screw thread, so that interlocking is in this clutch collar 33;

As shown in Figures 2 and 3, clutch collar 33 has runner 334, an adapter section 331 and an oblique conical section 332 that axially runs through wherein, and this clutch collar 33 is arranged in the prominent hole 14, and in order to allow

clutch collar

33 and 14 driving fits of prominent hole, this clutch collar 33 is funnel-form designs of adopting corresponding prominent hole 14 like this.Outer surface in adapter section 331 and oblique conical section 332 confluces then is formed with a ring groove 333, an also sheathed elastomeric O-rings 34 in the ring groove 333, make when clutch collar 33 is inserted in prominent hole 14, O type ring 34 just is fastened in the draw-in groove 15, strengthen the bond strength of clutch collar 33 and the section of bringing together 11 whereby, and prevent that clutch collar 33 breaks away from towards the holder section of finger 12 directions.In addition, the maximum radius of this oblique conical section 332 is less than injection tube 10 rooms 13 radiuses.Wherein, one end of this adapter section 331 is provided with female thread, for establishing with the external screw thread spiral shell of needle tubing seat 32, the bottom of this oblique conical section 332 is then neat near an end-grain cutting of room 13 with horn mouth 141, and the bottom of oblique conical section 332 also has the axially extended jut 338 of room 13 directions on one day, this jut 338 is protruding under normal conditions to be exposed in the room 13, and in push rod 20 pushes room 13 fully the time, these jut 338 proper elasticity are resisted against this elastic piston 25.

For further understanding the present invention, please also refer to Fig. 2 A and Fig. 2 B.Inner surface in adapter section 331 and oblique conical section 332 confluces has extended axially one down and has placed restrictions on member 335, this is placed restrictions on member 335 and includes the root 339 that a plurality of intervals are provided with, the one side of these roots 339 trims with the inner surface of adapter section 331, the free end of root 339 then form one have big footpath and the ring that is convexly equipped with towards tenon 24 axis directions protruding 340, this encircles protruding 340 and encloses structure and go out an opening 336 that slightly is narrower than tenon 24.In addition, cylindric adapter section 331 outer surfaces also spacer ring to be provided with four cards protruding 337, also above the section of bringing together 11 inwall draw-in grooves 15, be concaved with four corresponding card tongues 111 of protruding 337 that block at interval.

Because wide footpath less than ring protruding 340, the footpath of root 339 is wide, this is placed restrictions on member 335 and has bigger elastic deformation space like this, therefore when the tenon 24 of push rod 20 when opening 336 penetrates, place restrictions on member 335 and extend out and increase the bore of opening 336 along with thrust towards oblique conical section 332 directions, push rod 20 is passed swimmingly place restrictions on member 335, can improve the defective that push rod that existing structure produces is difficult for penetrating clutch collar like this, and can encircle protruding 340 by this and prevent that tenon from deviating from.

Further, the spacing design that fastens of the card protruding 337 that is convexly equipped with at interval by adapter section 331 outer surfaces and the card tongue 111 of the section of bringing together 11 inwalls, can avoid in the process of needle tubing seat 32 and clutch collar 33 screw locks, clutch collar 33 rotates in the lump with needle tubing seat 32 and produces the problem that is difficult for screw lock.

Claims

1. syringe comprises:

One injection tube, it is a hollow cylindrical body, the one end is formed with the section of bringing together, its other end then is provided with a holder section of finger, this injection tube inside is formed with a room, bring intrasegmental part together and then be formed with a prominent hole that is communicated with this room, the aperture in this prominent hole is less than the room aperture, and should prominent hole then be formed with a horn mouth near end of room;

One push rod, but be plugged in the room of injection tube in the mode of straight line slippage, the one end is provided with a tenon and for the elastic piston that is closely against chamber sidewall, and it is held in addition and then is formed with one by the finger, and this tenon axially protrudes outside this elastic piston;

One needle set group, comprise a needle tubing and a clutch collar, this clutch collar is arranged in the prominent hole, this clutch collar has runner, an adapter section and an oblique conical section that axially runs through wherein, this needle tubing is arranged on the adapter section top, the maximum radius of this oblique conical section is less than the radius of this injection tube room, and the bottom of oblique conical section and this horn mouth are neat near an end-grain cutting of room, the bottom of oblique conical section then towards the room axis of orientation to being extended with a jut;

Wherein, inner surface in adapter section and oblique conical section confluce has extended axially one down and has placed restrictions on member, this is placed restrictions on member and includes the root that a plurality of intervals are provided with, the free end of described root then form one have big footpath and the ring that is convexly equipped with towards the tenon axis direction protruding, described ring is protruding to be enclosed structure and goes out an opening that slightly is narrower than tenon, make tenon penetrate from the opening of placing restrictions on member by the elasticity of root, and protruding and prevent that tenon from deviating from by ring.

2. syringe according to claim 1 is characterized in that, this section of bringing together inwall is equipped with a draw-in groove, is provided with a concave ring groove in the adapter section and the oblique conical section confluce of clutch collar, and concave ring groove inner sheathed is for the O type ring that fastens with draw-in groove.

3. syringe according to claim 1 is characterized in that, this clutch collar is the rubber material.

4. syringe according to claim 1 is characterized in that, is concaved with at least one card tongue at the section of bringing together inner surface, the clutch collar outer surface then relatively this card tongue to be provided with at least one card protruding.