CN1238067C

CN1238067C - Needle seat of safety syringe

Info

Publication number: CN1238067C
Application number: CN 01141707
Authority: CN
Inventors: 罗正己
Original assignee: MINGGAO BIOCHEMICAL SCIENCE AN
Current assignee: Name Of High Medical Equipment (kunshan) Co Ltd
Priority date: 2001-09-13
Filing date: 2001-09-13
Publication date: 2006-01-25
Anticipated expiration: 2021-09-13
Also published as: CN1406643A

Abstract

The invention mainly comprises an injection tube, a needle head seat and a pressure ring. The joint part of the front section of the needle seat is fixedly arranged in the small inner diameter part of the front section of the injection tube, the clamping part of the rear section is provided with a notch, a movable piece is arranged in the notch, and the movable piece is connected on the clamping part through a rear connecting piece. The pressure ring is sleeved between the shoulder part of the inner wall of the large inner diameter part of the rear section of the injection tube and the flange and just corresponds to the clamping part of the rear section of the needle head seat. The pressure ring is provided with an elastic sheet which is inwards protruded at the position corresponding to the notch, so that the movable piece is slightly inwards protruded. The invention is supported against the front edge surface of the slot by the front end of the elastic sheet, thereby overcoming the stress from the front end of the needle head seat, preventing the needle head seat from retreating into the injection tube, reducing the production cost and improving the manufacturing qualified rate. The invention can also make the rotary assembling or disassembling action of the needle more reliable.

Description

The needle holder of safety injector

Technical field

The invention relates to a kind of medical safety injector, refer to a kind of needle holder of safety injector especially.

Background technology

The existing safety injector of tradition, be to be provided with the hook part in the push rod front end, can hook needle holder with the hook part when utilizing push rod to be pushed forward to the end, needle holder, entry needle can be recycled in the injection tube in the lump when pulling back backward, can not stab other people and pollute with convenient push rod.

Existing needle holder is to be fixed in intrasegmental part before the injection tube in the close-fitting mode.Yet when user desire assembling syringe needle, it is inserted in the PROPEL backward of needle holder with syringe needle, often needle holder is retracted in the injection tube backward.

From the rear end fluid pressure, to make the injection tube leading portion into pre-small post-large cone-shaped internal part when other has existing injection tube to inject in order bearing, to deviate from outside the injection tube forward so as to stopping needle holder.Yet pre-small post-large cone-shaped internal part makes that the aforementioned PROPEL backward that plugs syringe needle is easier needle holder is retracted in the injection tube.

Industrial circle is a head it off, all sets about from the close-fitting power that strengthens between needle holder, injection tube now.Yet, strengthen close-fitting power, the difficulty when but causing needle holder to be assembled in the injection tube leading portion; And, existing needle holder, injection tube are that the plastic cement with multi-point mould injects mold injection and goes out molding, since each die cavity to inject environment (for example running channel position, inject temperature, rate of cooling etc.) be not identical completely, also ubiquity diversity between several moulds when adding mass production, therefore inject each needle holder of back, its accurate dimension of the very difficult control of injection tube, the close-fitting power of the two still is difficult for grasping, and disqualification rate is higher, very perplexs industrial circle.

In addition, when user assembling syringe needle, often syringe needle is inserted on the needle holder earlier and is rotated again.Because existing needle holder external diameter, all rounded with the injection tube internal diameter, above-mentioned spinning movement will make needle holder rotate jointly thereupon, cause user to be difficult for determining whether syringe needle has been assembled appropriate.Otherwise when user was desired to unload syringe needle, the action of rotation syringe needle also made needle holder not quick detachable thereupon rotating.Below all non-very good.

Summary of the invention

The inventor reflects because of in this, originally in the spirit of positive creation, conceives a kind of needle holder of the safety injector that can address the above problem, and several times research experiment is eventually to finishing the invention that this promotes social welfare.

Main purpose of the present invention is that a kind of needle holder of safety injector is being provided, so that can avoid needle holder to be retracted in the injection tube backward.

Another object of the present invention is that a kind of needle holder of safety injector is being provided, so that can reduce production costs, improve fine ratio of product.

Another purpose of the present invention is that a kind of needle holder of safety injector is being provided, so that can impel the rotation assembling or the dismounting action of syringe needle more certain.

For reaching above-mentioned purpose, the present invention mainly comprises an injection tube, a needle holder and a pressure rings.The inner medium altitude chamber that forms of injection tube, medium altitude chamber comprise little inside diameter, and the large diameter portion of back segment of leading portion, and are formed with a shoulder between little inside diameter and large diameter portion, and large diameter portion the place ahead is close to the suitable distance of shoulder and inwardly convexes with flange.Needle holder comprises joint portion, and the holding section of back segment of leading portion, and run through joint portion and holding section with a centre gangway, the joint portion is placed in the little inside diameter of injection tube so that needle holder is fixed in injection tube inside, the holding section ring digs and is provided with at least one short slot in week, each short slot front end is a leading edge face, each short slot inside has been installed with a movable piece, and movable piece is that at least one binding sheet with the rear is connected with on the holding section, and is formed with the portion of closing of colluding in inboard, the place ahead.Pressure rings is sheathed between the shoulder and flange of injection tube large diameter portion inwall, and just corresponding to the holding section of needle holder back segment, pressure rings inwardly is convexly equipped with a shell fragment respectively corresponding to each short slot position, rectify the leading edge face that is resisted against short slot before the shell fragment, shell fragment also can apply an inside pre-applied force on movable piece, and it is inner outstanding to impel movable piece can omit to centre gangway.

Therefore, when push rod is pushed forward to the end, can stretches into the centre gangway of needle holder and strut movable piece, and the portion of closing of colluding that makes the hook part of head front end hook movable piece, impel needle holder to pull back backward and be recycled in the injection tube in the lump with push rod with the push rod head.

The front end contact of pressure rings shell fragment of the present invention the leading edge face of needle holder short slot, so can overcome from the suffered power of needle holder front end, avoid needle holder to be retracted in the injection tube backward.Owing to no longer be dependent on the accuracy of manufacture of needle holder, injection tube, so can reduce production costs, improve the manufacturing qualification rate.

In addition, pressure rings of the present invention if can beyond open elastic force support fixing (with big slightly external diameter close-fitting fix or other equivalent way properly fixing) in injection tube large diameter portion inwall, then when rotation assembling or dismounting syringe needle, needle holder is driven to rotate, to protrude in the needle holder short slot and the restriction that is subjected to short slot two sides is prevented because of shell fragment, so can make the rotation assembling or the dismounting action of syringe needle more certain.

Because the present invention constructs novelty, can provide on the industry and utilize, and truly have the enhancement effect, so apply for novel patent in accordance with the law.

Brief description

Fig. 1 is the three-dimensional exploded view of the preferred embodiment of the present invention.

Fig. 2 is the cutaway view of the preferred embodiment of the present invention.

Fig. 3 is the cutaway view of the preferred embodiment of the present invention.

Fig. 4 implements aspect for pressure rings of the present invention is another kind of.

1 injection tube, 10 medium altitude chambers, 11 little inside diameters

12 large diameter portions, 13 shoulders, 14 flanges

2 needle holder, 20 centre gangwaies, 21 joint portions

22 holding sections, 23,24 short slots, 231,241 leading edge faces

233,243 movable pieces 232,232 ', 242,242 ' link sheet

2330,2430 collude the portion's of closing 5 syringe needles

3,3 ' pressure rings, 31,32 shell fragments, 310,320 front ends

4 push rods, 41 heads, 42 hook parts

Preferred embodiment describes in detail

Fig. 1 shows one embodiment of the present invention, this routine safety injector by injection tube 1, needle holder 2, pressure rings 3, and push rod 4 formed.

Injection tube 1 is a hollow cylinder, and inside is a medium altitude chamber 10, and medium altitude chamber 10 leading portions are little inside diameter 11, and back segment is a large diameter portion 12.Be equipped with a shoulder 13 between little inside diameter 11 and the large diameter portion 12.The contiguous shoulder 13 suitable distances in large diameter portion 12 the place aheads inwardly convex with flange 14.In this example, this flange 14 is to be a domain setting, also can encircle certainly to be with isolated projection, wedge or other equivalent fixture blocks in week to be symmetrical arranged.

Please cooperate Fig. 2 to see it in the lump again, needle holder 2 leading portions are joint portion 21, and back segment is holding section 22, and therefrom run through it with a centre gangway 20.Holding section 22 rings dig and are provided with symmetric two

short slots

23,24 in week, and the front end of this two

short slot

23,24 is formed with a leading edge face 231,241, two short slots 23, the 24 inner movable pieces 233,243 that also are provided with respectively respectively.Movable piece 233 is to link sheet 232,232 ' one with two of rear to be connected with on holding section 22, and movable piece 243 also links sheet 242,242 ' one with two of rear and is connected with on holding section 22.Movable piece 233,243 is formed with the portion of closing 2330,2430 of colluding in addition respectively in inboard, the place ahead.

During assembling, pressure rings 3 is inserted in needle holder 2 and is reached 22 positions, back segment holding section by the place ahead earlier, needle holder 2, pressure rings 3 is pressed into by injection tube 1 rear with the assembled group tool together arrives injection tube 1 leading portion inside diameter 11 again.At this moment, as shown in Figure 2, needle holder 2 joint portions 21 just can be installed with little inside diameter 11 inside of being fixed in injection tube 1, and pressure rings 3 just is being sheathed between the shoulder 13 and flange 14 of large diameter portion 12 inwalls of injection tube 1, and corresponding to the holding section 22 of needle holder 2 back segments.

Pressure rings 3 inwardly is convexly equipped with two

shell fragments

31,32, and this two

shell fragment

31,32 corresponds respectively to above-mentioned two

short slots

23,24, and can apply an inwardly pre-power respectively to this two movable piece 233,243.The front end 310,320 that please notes this two

shell fragment

31,32 just in time is resisted against respectively on short slot 23, the 24 leading edge faces 231,241.

Fig. 2 shows that movable piece 233,243 is subjected to the compressing of

shell fragment

31,32 inside elastic force when push rod 4 is not shifted the end onto as yet, can be to link sheet 232,232 ', 242,242 ' be axle slightly to internal rotation, it is inner outstanding to centre gangway 20 slightly just to make it collude the portion of closing 2330,2430.

Fig. 3 shows that push rod 4 heads 41 just stretch into needle holder 2 centre gangwaies 20 and strut two movable pieces 233,243 when push rod 4 is shifted the end onto, and two

shell fragments

31,32 just outwards opened and returned back to pressure rings 3 original internal diameter sizes this moment.Therefore, when push rod 4 is pulled back backward, can hook the portion of closing 2330,2430 of colluding of two movable pieces 233,243, smoothly needle holder 2 be retracted two

shell fragments

31,32 of crossing pressure rings 3 and be recycled in the injection tube 1 with the hook part 42 of push rod 4 front ends.

Please know clearly and read Fig. 2, this example with syringe needle 5 sleeves when needle holder 2 front ends, because pressure rings 3 two

shell fragments

31,32 front end 310,320 can be resisted against the leading edge face 231 of

short slot

23,24 respectively, 241, so can overcome from the suffered power of needle holder 2 front ends, avoid needle holder 2 to be retracted into backward in the injection tube 1.

Use when of the present invention,, and improve the manufacturing qualification rate because so the accuracy of manufacture of no longer being dependent on needle holder, injection tube, can reduce production costs can inject shaped needle headstock and injection tube with lower accuracy to provide one to avoid needle holder to be retracted into the close-fitting power of injection tube.

The pressure rings 3 of shown in Figure 3 example, be around the open ring body that forms by the stainless steel metal sheet, this pressure rings 3 has the outer elastic force of opening and is fixed in injection tube 1 large diameter portion 12 inwalls to support if be set as, then when rotation assembling or dismounting syringe needle 5, needle holder 2 related turns will be because of

shell fragment

31,32 protrude into needle holder 2 short slots 23, in 24 and be subjected to the restriction of

short slot

23,24 two sides and prevented, so can make the rotation assembling or the dismounting of syringe needle 5 move more certain.

Fig. 4 shows the another kind of pressure rings 3 ' of the present invention, and its sealing ring body that can be designed to big slightly external diameter is put large diameter portion 12 inwalls that are fixed in injection tube 1 with close-fitting, also can make the rotation assembling or the dismounting action of syringe needle 5 more certain.The material of this kind pressure rings 3 ' will be not limited to metal, also can use other high-tension materials, for example engineering plastic etc.

To sum up institute is old, and no matter the present invention all shows it totally different in the feature of prior art with regard to its purpose, means and effect, for a quantum jump of the needle holder of safety injector, earnestly asks your auditor to perceive, and grants quasi patent early.

Claims

1. A needle holder for a safety syringe, comprising:

A syringe, forming a hollow chamber inside, the hollow chamber includes a small inner diameter portion of the front section, and a large inner diameter portion of the rear section, and a shoulder is formed between the small inner diameter portion and the large inner diameter portion, the large inner diameter a flange protruding inwardly at a suitable distance from the front of the shoulder adjacent to the shoulder;

A needle holder, including the joint part of the front section and the locking part of the rear section, and a central passage runs through the joint part and the locking part, and the joint part is accommodated in the small inner diameter part of the syringe so that the needle holder It is fixed inside the injection barrel, and at least one slot is dug around the engaging portion, the front end of each slot is a front edge surface, and a movable part is provided in each slot, and the movable part is later At least one connecting piece on the side is connected to the engaging portion, and a hooking portion is formed on the inside of the front, and the movable part can be stretched by the push rod; and

A pressure ring is sleeved between the shoulder and the flange of the inner wall of the large inner diameter part of the syringe, and is corresponding to the engaging part of the rear section of the needle seat. A shrapnel protrudes inward, and the front end of the shrapnel just abuts against the front edge of the notch, and the shrapnel can apply an inward pre-stressing force on the movable part, so that the movable part can move toward the inside of the central channel. protrude.

2. The needle hub of a safety syringe according to claim 1, wherein there are at least two said slots, which are arranged symmetrically along the circumference of the engaging portion.

3. The needle hub of a safety syringe as claimed in claim 1, wherein the pressure ring has an outer elastic force to stretch and fix on the inner wall of the large inner diameter portion of the syringe.

4. The needle hub of a safety syringe as claimed in claim 1, wherein the pressure ring is an open ring.

5. The needle hub of a safety syringe as claimed in claim 1, wherein the pressure ring is a closed ring.

6. The needle hub of a safety syringe as claimed in claim 1, wherein the pressure ring is made of metal.

7. The needle hub of a safety syringe as claimed in claim 1, wherein the flange is provided as a whole ring.