CN1323638A

CN1323638A - Safe syringe

Info

Publication number: CN1323638A
Application number: CN 00103552
Authority: CN
Inventors: 张赖玉好
Original assignee: Individual
Current assignee: Individual
Priority date: 2000-03-27
Filing date: 2000-03-27
Publication date: 2001-11-28
Anticipated expiration: 2020-03-27
Also published as: CN1188184C

Abstract

A safety injector includes syringe, liquid pushing plunger piston, needle set and needle head, in which the liquid pushing plunger piston and needle can be meshes mutually after injection, and the needle is drawed back into the syringe. In addition, the needle set after being draw back into the syringe will automatically be inclined prevent expose outside the syringe.

Description

Safety injector

The present invention relates to a kind of safety injector, particularly a kind of can be after injection effectively with in the injection needle retraction injection tube and the safety injector that is fixed.

An indispensable apparatus is gone up in the medical treatment of syringe system.For avoiding the blood cross infection, present syringe all adopts disposable product, to stop reusing of syringe.Yet disposable syringe Chang Yin deals with improperly, causes medical personnel or cleaning personnel because of the injured blood disease that infects of false touch injection needle.Therefore, how to preserve the injection needle that uses the back syringe, prevent to hurt sb.'s feelings, become a big problem of present syringe construction design because of false touch.

Mostly the general now practice of using the back syringe of handling is injection needle is accommodated in the injection tube after injection.For example the Taiwan utility model patent is announced No. 165304 and is disclosed a kind of " syringe novel structure safe in utilization ", it mainly is to utilize vertical the two the correspondingly-shaped of liquid base that pushes away of bulge loop that the injection tube head do not hold and fluid push rod, the two is fastened mutually, the injection tube head that will include syringe needle is again leant on and is back in the injection tube, and it is not exposed.The Taiwan utility model patent is announced No. 356720 and is disclosed a kind of " safety injector ", and it mainly is to utilize the chimeric mutually of the screw part of syringe needle end and the vertical small convex pillar of push rod and screw togather, and syringe needle is returned in the injection tube again.

The object of the present invention is to provide a kind of safety injector, it can be accommodated in injection tube inside with injection needle after injection, prevents to cause disease infection because of the false touch injection needle.

Another object of the present invention is to provide a kind of safety injector, it can be fixed in injection tube inside effectively with the injection needle that is incorporated in injection tube inside, prevents that it is exposed to the injection tube outside once more because of being subjected to external force, causes personnel because of the injured infection of false touch.

Another purpose of the present invention is to provide a kind of safety injector, and its structure is comparatively simple and operation is comparatively convenient, helps manufacturing, and helps user and operate effectively.

For reaching above-mentioned purpose of the present invention, safety injector of the present invention is mainly by an injection tube, one pushes away the fluid column plug, a needle set group and a pin medicated cap are formed, wherein, an end that pushes away the fluid column plug is provided with an elastic piston, and form a taper projection on the elastic piston: the needle set group comprises a clutch collar, form a bellmouth on the clutch collar, a plurality of buckling devices then are set around the bellmouth.When injection finished, the taper projection on the elastic piston can be meshed with the bellmouth on the needle set group, can borrow the external force pulling to push away the fluid column plug and the needle set group drawn in the injection tube and with it was accommodated in injection tube inside.In addition, form a jut on the clutch collar of needle set group, this jut can make the needle set group automatically inclined when being leant on into injection tube inside, so as to the inwall against the position injection tube, prevents that it is exposed to the injection tube outside once more.

The present invention is described in detail below in conjunction with accompanying drawing:

Fig. 1 is the decomposition side view of one of safety injector of the present invention embodiment;

Fig. 2 is an injection tube generalized section among the embodiment of Fig. 1;

Fig. 3 is for pushing away the cut-away section sketch map of fluid column plug among the embodiment of Fig. 1;

Fig. 4 A is the generalized section of needle set group among the embodiment of Fig. 1;

Fig. 4 B is the decomposition generalized section of needle set group among the embodiment of Fig. 1;

Fig. 4 C is the upward view of needle set group among the embodiment of Fig. 1;

Fig. 4 D and Fig. 4 E are the upward view of other form of needle set group among the embodiment of Fig. 1;

Fig. 5 A pushes away the fluid column plug to be pushed mode of operation generalized section to inject forward among the embodiment of displayed map 1;

Fig. 5 B is the mode of operation generalized section of after pushing away the fluid column plug and the needle set group is meshed among the embodiment of displayed map 1 the needle set group inwardly being drawn;

Fig. 5 C is the mode of operation generalized section that the needle set group is incorporated in injection tube inside fully among the embodiment of displayed map 1;

Fig. 6 is another embodiment decomposition side view of the present invention's safety injector;

Fig. 7 is the generalized section of injection tube among the embodiment of Fig. 6;

Fig. 8 is for pushing away the cut-away section sketch map of fluid column plug among the embodiment of Fig. 6;

Fig. 9 A is the generalized section of needle set group among the embodiment of Fig. 6;

Fig. 9 B is the decomposition generalized section of needle set group among the embodiment of Fig. 6;

Fig. 9 C is the upward view of needle set group among the embodiment of Fig. 6;

Fig. 9 D and Fig. 9 E are the upward view of other form of needle set group among the embodiment of Fig. 6;

Figure 10 A pushes away the fluid column plug to be pushed mode of operation generalized section to inject forward among the embodiment of displayed map 6;

Figure 10 B is the mode of operation generalized section of after pushing away the fluid column plug and the needle set group is meshed among the embodiment of displayed map 6 the needle set group inwardly being drawn; And

Figure 10 C is the mode of operation generalized section that the needle set group is incorporated in injection tube inside fully among the embodiment of displayed map 6.

One of safety injector 1 of the present invention embodiment as shown in Figure 1, it belongs to the central type syringe that a kind of injection needle is set at the end face central authorities of injection tube.This safety injector 1 mainly includes an injection tube 2, and pushes away fluid column plug 3, one needle set groups 4 and a pin medicated cap 5.

As shown in Figure 2, injection tube 2 is the hollow cylindrical body of a both ends open, and its front end forms the prominent hole portion 21 of internal diameter reduction, and its rear end then forms a holder and refers to an edge 22.

As shown in Figure 3, one elastic piston 31 is set for the front end that pushes away fluid column plug 3 that is sheathed on injection tube 2 inside, its can be tight against the inwall of an injection tube 2 and slippage thereon, its rear end then is formed one by finger 32.In addition, the surperficial central authorities of elastic piston 31 are provided with a taper projection 33.

Shown in Fig. 4 A to Fig. 4 C, the main system of needle set group 4 insert for injection needle 41 by an injection needle 41, one and fixedly the needle tubing seat 42 and of usefulness formed for the clutch collar 43 of needle tubing seat 42 sheathed usefulness.Needle set group 4 is to be sheathed in the prominent hole portion 21 of injection tube 2, and injection needle 41 is exposed to outside the injection tube 2.

The surface of needle tubing seat 42 forms an external thread part 44, and the front end of clutch collar 43 forms the internal thread part 45 of a correspondence, for external thread part 44 bolts of needle tubing seat 42, shown in Fig. 4 A and Fig. 4 B.

The rear end of clutch collar 43 forms flange shape pedestal part 46, form a cyclic groove 47 on this pedestal part 46, one elastic washer 48 then is sheathed in the groove 47, so that form sealed engagement between the inner surface of the prominent hole portion 21 of the pedestal part 46 of clutch collar 43 and injection tube 2, and shown in Fig. 4 A and Fig. 4 B.

The end of the pedestal part 46 of clutch collar 43 forms the bellmouth 49 of an inside reduction radius, and a plurality of buckling devices 50 (with reference to figure 4C) that wait the radian configuration are set around this bellmouth 49.Buckling device 50 forms the angled portion that ecto-entad tilts, to define bellmouth 49.In addition, the appropriate position on bellmouth 49 sides of pedestal part 46 forms a jut 40.

In this embodiment, bellmouth 49 is to be formed at centre among the pedestal part 46 of clutch collar 43, and injection needle 41 and needle tubing seat 42 are then aligned with each other with the fluid passage and the bellmouth 49 of clutch collar 43, to form the injecting fluid path of a central type, shown in Fig. 4 A.

The operation of safety injector 1 of the present invention is described below with reference to Fig. 5 A to Fig. 5 C.When injecting, user will push away fluid column plug 3 and push (Fig. 5 A) forward.Be pushed when being extruded onto its extreme position when pushing away fluid column plug 3, taper projection 33 just is inserted in the bellmouth 49 of clutch collar 43.Because taper projection 33 is subjected to the backstop of the angled portion of buckling device 50, forms a fastening effect, taper projection 33 just is fixed in the bellmouth 49 to deviate from again, so as to make needle set group 4 with push away fluid column plug 3 and form the state that is meshing with each other.Next, will push away fluid column base 3 and pull back, needle set group 4 is just stressed and move (Fig. 5 B) from the prominent hole of injection tube 2 one 21 to the inside of injection tube 2.When whole needle set group 4 is drawn within the injection tube 2, because the jut 40 on the clutch collar 43 is subjected to the elastic force effect because of being resisted against the elastic piston 31 that pushes away fluid column plug 3, make needle set group 4 automatically inclined in injection tube 2, so as to against the inwall of living injection tube 2, can prevent that needle set group 4 is exposed to injection tube 2 outsides (Fig. 5 C) once again.

Another embodiment of safety injector 1 of the present invention is shown in Fig. 6 to Figure 10 C, and it is the side position formula syringe that a kind of injection needle is set at the end face side position of injection tube.

In this embodiment, bellmouth 49 still is formed at the centre of the pedestal part 46 of clutch collar 43.Being different from last embodiment part is: be formed with a through hole 51 that aligns with injection needle 41 and needle tubing seat 42 on the clutch collar 43 among this embodiment in addition.This through hole 51 is to setover mutually with bellmouth 49, so as to forming the injecting fluid path of a side position formula, shown in Fig. 9 A.Remainder is then identical with last embodiment, represents with the components identical numbering at this.

In addition, demonstrate the buckling devices 50 (respectively being 90 ° radian) that are provided with configuration such as four radians such as grade among aforementioned two embodiment.Yet, also visual actual needs (as: material behavior and size etc.) and adopt the buckling device 50 of different numbers, for example: can adopt three (respectively being 120 ° of radians) or six (respectively being 60 ° of radians) buckling devices 50, shown in Fig. 4 D～Fig. 4 E and Fig. 9 D～Fig. 9 E.

More than illustrate only as the preferred embodiments of the present invention, and unrestricted, any according to modification and variation that the present invention did, must belong to protection domain of the present invention.

Claims

1. safety injector, it comprises:

One injection tube, it is the hollow cylindrical body of a both ends open, and the one end makes a prominent hole portion, and its other end then makes a holder and refers to an edge;

One pushes away the fluid column plug, and it is for being sheathed on the inside of described injection tube, and the one end is provided with an elastic piston, can be tight against the inwall of this injection tube and slippage thereon, its other end then forms one by the finger;

One needle set group, it is by an injection needle, and one inserts and the fixing needle tubing seat of usefulness for this injection needle, and a clutch collar of establishing usefulness for this needle tubing cover for seat forms, and this needle set group system is sheathed in the prominent hole portion of this injection tube, and injection needle is exposed outside the injection tube; And

One pin medicated cap, it is for outside the prominent hole portion that is placed in injection tube, to envelope injection needle;

It is characterized in that: the surface of described needle tubing seat forms an external thread part, and one of described clutch collar end then forms the internal thread part of a correspondence, for the external thread part bolt of needle tubing seat;

The other end of described clutch collar is formed with a pedestal part, forms a cyclic groove on this pedestal part, and an elastic washer then is sheathed in this groove, is sealedly engaged for forming between the inner surface of the prominent hole of the pedestal part of clutch collar and injection tube portion;

The end of the pedestal part of described clutch collar forms the bellmouth of an inside reduction radius, then is provided with a plurality of buckling devices that wait the radian configuration around this bellmouth, and this buckling device is to be formed the angled portion that ecto-entad tilts, to define this bellmouth; The appropriate position other at the bellmouth of pedestal part forms a jut; And

Push away on the elastic piston of fluid column plug a taper projection is set, in the bellmouth that is inserted in clutch collar, and form the state that is meshing with each other.

2. safety injector as claimed in claim 1 is characterized in that: described bellmouth is the central authorities that are formed at the pedestal part of clutch collar, and is the shape that aligns with injection needle and needle tubing seat.

3. safety injector as claimed in claim 1 is characterized in that: described bellmouth is the central authorities that are formed at the pedestal part of this clutch collar, and injection needle and needle tubing seat then are sheathed in one of clutch collar through hole, forms biasing shape mutually.

4. safety injector as claimed in claim 1 is characterized in that: three buckling devices that wait the radian configuration are set around the bellmouth.

5. safety injector as claimed in claim 1 is characterized in that: four buckling devices that wait the radian configuration are set around the bellmouth.

6. safety injector as claimed in claim 1 is characterized in that: six buckling devices that wait the radian configuration are set around the bellmouth.