JPH07204268A - Syringe - Google Patents

Abstract

PURPOSE: To obtain an injector that is easy to assemble and safe to use by putting together a plunger and a linking component, which is indented to fit with a conical-shaped inclined female fitting piece having an angle of a cone longitudinal axis tilted from the axis of an injector needle. CONSTITUTION: Insertion and pressing of a male fitting piece 301 against an inclined female fitting piece 27 of an injector needle device 2 and branching of the injector needle's rear tip 230 of the injector needle device 2 by expansion in a manner that elastic potential energy is stored connects a linking component 30 and the injector needle device 2. After the injector needle device 2, which is connected with a plunger 31, is drawn inside the hollow part of the injector cylinder 11 and when the male fitting piece 301 and the inclined female fitting piece 27 are firmly connected, the inclined female fitting piece 27, by releasing the elastic force accumulated in the injector needle's rear tip 230, returns to its original position in a state connected to the male fitting piece 301 of the linking component 30 and tilts the injector needle device 2. When force is again applied to press the injector needle device 2 outwards, the needle tip 211 is obstructed by a sealing ring 15 placed in the front portion of the injector cylinder 11 and the needle 2 is bent to prevent outward protrusion.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to syringes. More particularly, it relates to a simple and safe syringe with a retractable self-tilting needle.

[0002]

2. Description of the Related Art U.S. Pat. No. 5,232,458, entitled "Safe Syringe with Telescopic Self-tilting Needle," issued to the inventor of the present invention, is secured to a plug 13 by being embedded in the front of the syringe. Needle having a needle head on the rear side, and a slanting needle provided on the front side of the plunger (rod piston) slidably provided in the syringe so as to engage with the needle head for the inclined needle in the syringe. There is described a plunger having a socket (receptacle), and when the plunger and the injection needle are retracted into the syringe, it is possible to prevent the retractable injection needle from protruding to the outside to prevent damage to the outside. Has been done.

However, the plug 13 should be attached to the front of the syringe 1 with the needle 13 held by the plug 13 so that it is normally located in the front of the syringe 1 for injection.

In order to reduce material costs and further increase the efficiency of such safe syringe assembly, the plug 13 should be removed, the needle 2 simplifies the assembly, and
It should have been attached directly to the front of the syringe 1 to reduce its cost.

[0005]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above problems and provide a safe syringe which can be easily assembled.

[0006]

The present invention generally has a hollow needle held in the front of a syringe, a plunger movably held in a syringe cylinder, and a conical longitudinal axis inclined from the needle axis. A safety member consisting of a connecting member held on a plunger for engagement with at least one inclined female mating part, which is usually recessed in the rear part of a hollow needle, which comprises an inclined female mating part formed as a conical shape. According to the present invention, according to the present invention, when the injection needle is fixed to the syringe having the injection needle shaft so as to be aligned with the injection shaft vertically formed in the center of the injection device, the connecting member is connected after the injection is completed. When the plunger is pressed against the injection needle part so that it is inserted into the inclined female type mating part, the inclined female type mating part and the connecting member are combined, and when the plunger and the injection needle are retracted into the syringe cylinder, the inclined female type篏Parts and the connecting member is returned to the original is the connecting member and the plunger by meshing smoothly, the injection needle is prevented from automatically inclined to protrude into the syringe, whereby it is possible to prevent the protrusion of the external.

As shown in the drawings, the syringe of the present invention comprises an injector 1, a needle device 2 and a plunger means 3.
It consists of Here, in the syringe, the side where the injection needle is located is the front, and the side where the plunger handle is located is the rear,
Also, the front-back direction is vertical.

The injector 1 comprises the following members: a hollow portion 10 formed in the syringe cylinder 11 for filling the drug solution 4 into the syringe cylinder 11 and a syringe shaft extending in the longitudinal direction in the central portion of the syringe cylinder 11. Syringe cylinder 11 with 100;
Through hole 1 formed in the front part of the syringe cylinder 11 and contracting forward from the syringe cylinder 11 to communicate with the syringe cylinder 11.
Sleeve part 12 having 21; a branch part 122 formed at the rear part of the sleeve part 12 adjacent to the syringe cylinder 11; an annular groove 12 having an annular recess in the front part of the sleeve part 12.
0; Syringe handle 1 formed at the rear end of the syringe cylinder 11
4; a sealing ring 15 formed annularly at the rear end of the sleeve 12 between the through hole 121 of the sleeve 12 and the hollow portion 10 of the syringe cylinder 11; and an annular limit protrusion 16 formed annularly at the rear of the syringe cylinder 11.

The injection needle device 2 includes the following members: an injection needle portion 21 having an injection needle needle point 211 formed at the front end of the injection needle portion 21; held in the sleeve portion 12 so as to engage with the annular groove 120. An annular packing ring 26 around the shank portion 22; a bifurcated elongated groove 25 having a depression forward from the rear end of the injection needle longitudinally provided at the rear of the leg portion 22; At least one inclined female mating portion 27 formed in a conical shape at the rear portion of the portion 22 and having a recessed portion from the rear end portion 230 of the injection needle toward the front;
A needle shaft 200 along the longitudinal axis in the center of the needle device 2 and a leg 2 made of a resilient plastic material.
2 and needle rear end 230. The inclined female type mating portion 27 such as a socket is not limited in the present invention, but the two sockets 2 having a recess in parallel with the rear part of the injection needle device 2 are provided.
It may be composed of a plurality of sockets such as 7, 27a.

The needle shaft 200 is generally aligned with the syringe barrel shaft 100 when the injection device 2 is attached to the injector 1 sleeve portion 12 during injection.

Each slanted female mating portion 27 is generally conical and includes the following members: conical bottom 271; conical bottom 2
71. A conical apex 272 tapering forward from 71; where the longitudinal conical axis 270 is straight with the conical apex 272 and perpendicular to the conical bottom 271 and tilts and deviates from the needle axis 200 of the injection device 2, 200 and the longitudinal conical axis 270 of the inclined female mating portion 27 define a sharp angle A. The tilted female mating portion 27 is combined with the plunger means 3 after the injection is completed, and when the needle means 2 is pulled into the syringe cylinder 11, the tilted female type male part such as the arrowhead of the plunger means 3 is tilted. Fits tightly with the mating part 301.

The plunger means 3 comprises the following members: a plunger 31 movably held in the syringe cylinder 11 of the injector 1; an inclined female mating portion 27 provided on the needle device 2. The connecting member 30 having the male mating portion 301 formed at the front end of the insertable connecting member 30 and held in the conical recess 34 of the plunger 31; the male mating portion to be inserted into the inclined female mating portion 27 When the injection needle rear end 230 enclosed in the branch portion 122 formed at the rear end of the injector 1 sleeve portion 12 is divided by the joint portion 301, the injection needle rear end 2
A holding socket 32 concentrically provided around the male mating portion 301 so as to connect 30; a plunger 31
A plan having a plunger handle 37 extending rearward from the plunger 31 so as to engage the annular limit protrusion 16 formed at the rear end of the syringe cylinder 11 and the annular recess 311 of the plunger 31 to limit the backward movement. Jar stick 35. The plunger shaft 300 defined by the vertical axis in the central part of the injector 1 is usually the injection needle shaft 20 of the injection needle device 2.
It is aligned with 0 and is aligned with the syringe shaft 100 of the injector 1.

The connecting member 30 comprises the following members: it is conical and connects with the conically inclined socket 27 of the needle device 2 and, as shown in FIG. 1, normally in preparation for drug injection. The plunger shaft 300, the needle shaft 200, and the syringe shaft 100 have a barbed portion 301 having a barbed portion apex 301a that is a straight line, and a neck portion 30 coupled to the barbed portion 301.
2; and a conical base 303 having an annular protrusion 304 formed around the conical surface and embedded in the conical recess 34 of the plunger 31 to exhibit sufficient sealing force.
Then, the plunger rod 35 of the plunger means 3 was attached to the conical base portion 303.

[0014]

When the syringe of the present invention is used as shown in FIG. 1, the plunger 31 is pushed forward so as to inject the drug in the syringe cylinder 11 through the needle device 2 into the patient.

A male needle portion 301 of the connecting member 30 is forcibly inserted into and pushed by the slanted female needle portion 27 of the injection needle device 2 so as to store elastic potential energy at the branched rear portion of the injection needle device. When the rear end 230 of the second needle is expanded and branched, the connecting member 30 and the needle device 2 are connected as shown in FIGS. 2 and 6.

After the injection needle device 2 connected to the plunger 31 is drawn into the hollow portion 19 of the syringe cylinder 11 as shown in FIG. 3, the male mating portion 301 is shown as shown in FIGS.
When the inclined female type mating portion 27 and the inclined female type coupling portion 27 are strongly coupled, the injection needle device 2
The inclined female type mating portion 27 returns to its original position in a state of being sufficiently coupled with the male member mating portion 301 of the connecting member 30 of the plunger means 3 by releasing the elastic force accumulated at the rear end 230 of the injection needle. , Plunger 31 as shown in FIGS.
The injection needle device 2 combined with is tilted. When the injection needle device 2 is pushed outward again, the needle tip 211 is moved to the syringe cylinder 11
It is obstructed by the sealing ring 15 formed on the front part, whereby the injection needle 2 bends and is prevented from protruding to the outside, and further damage and pollution to the environment are prevented.

[0017]

EFFECTS OF THE INVENTION The syringe of the present invention does not have a plug (corresponding to the plug 13 of the above-mentioned US Pat. No. 5,232,458), has a low cost and is easy to assemble.

On the other hand, in the injection needle device 2, since the used injection needle device 2 can be removed from the sleeve portion 12 and replaced, a new injection needle can be inserted into the sleeve portion from the open end of the sleeve portion 12.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of the syringe of the present invention which is ready for injection.

FIG. 2 is an explanatory view showing an embodiment of the injector of the present invention when the injection of the drug solution is completed.

FIG. 3 is an explanatory view showing an embodiment of the injector of the present invention in which an injection needle is pulled into the injector.

FIG. 4 is an explanatory view showing an embodiment of the syringe of the present invention in which the injection needle is bent in the syringe.

FIG. 5 is a partially broken explanatory view showing an injection needle used in the present invention.

FIG. 6 is a partially broken explanatory view showing a connecting member connected to a rear portion of an injection needle according to the present invention.

FIG. 7 is a partially cutaway illustration showing a tilted injection needle retracted into the syringe of the present invention.

[Explanation of symbols]

2 ... Injection needle device 3 ... Plunger means 11 ... Syringe cylinder 12 ... Sleeve part 16 ... Annular protrusion 21 ... Injection needle part 22 ... Leg part 25 ... Elongated groove 26 ... Annular packing ring 27 ... Female mating part 30 ... Connection Member 31 ... Plunger 32 ... Holding socket 34 ... Conical recess 35 ... Plunger rod 37 ... Plunger handle 120 ... Annular groove 211 ... Needle tip 230 ... Injection needle rear end 231 ... Guide port 271 ... Conical bottom 272 ... Conical vertex 300 ... Plunger shaft 301 ... Male mating part 302 ... Neck part 303 ... Conical base part 304 ... Annular protrusion 311 ... Annular recess

Claims (5)

[Claims] 1. An injector including a syringe cylinder and a sleeve portion having a through-hole attached to a front portion of the syringe cylinder and communicating with the syringe cylinder; fixed to a leg portion provided on the sleeve portion and at a rear portion thereof. An injection needle device including a hollow injection needle portion having at least one inclined female mating portion having a conical axis that forms an acute angle with the injection needle axis that is in line with the injection needle axis; and slidable within the syringe cylinder And a plunger means embedded in the plunger and a connecting member embedded in the plunger and having a male mating portion provided at a front end so as to be coupled to the inclined female mating portion. Characteristic syringe. 2. The injection needle device has an injection needle portion 21 having a needle tip 211 formed at a distal end portion thereof; a needle needle portion 21 coupled to the injection needle portion 21, and a surrounding portion so as to engage with an annular groove 120 of the sleeve portion 12. Leg 2 with an annular packing wheel 26 provided
2; a branched elongated groove 25 formed in the rear part of the leg part 22 along the longitudinal axis and having a recess from the rear end part 230 of the injection needle to the front side; formed in the rear part of the leg part 22, and
At least one inclined female mating portion 27 that communicates with a guide port 231 that is recessed forward from the rear end portion 230 of the syringe.
The syringe according to claim 1, further comprising: 3. The inclined female type mating portion 27 has a conical bottom 271.
The syringe according to claim 1 or claim 2, further comprising a conical apex 272 tapering forward from the conical bottom 271. 4. The plunger means (3) is held slidably in the syringe cylinder (11); the plunger (31) is held in a conical recess (34) and inserted into the inclined female mating portion (27). A connecting member 30 which is possible and has a male mating part 301 provided at the front end; the injection needle rear end 23
Holding socket 32 concentrically arranged around the male mating portion 301; having an annular recess 311 for engaging with an annular limiting projection 16 formed at the rear of the syringe cylinder 11 The syringe according to any one of claims 1 to 3, further comprising a plunger rod 35 having a jar 31 and a plunger handle 37 protruding rearward of the plunger 31. 5. A barbed part having a conical shape and a barbed part 301a apex that engages with the inclined female type mating part 27; a neck part 302 coupled to the barbed part; and the conical recess 34. A syringe according to any one of claims 1 to 4, having a conical base 303 having an annular projection 304 that is embedded and formed around the conical surface.