JPH08141081A - Injector commonly used for single chamber type vessel - Google Patents

Abstract

PURPOSE: To eliminate the anxiety about the possibility that the air hermetically sealed between the inner peripheral surface of the outside cylindrical part of the outside cylinder of an injector and the projecting parts of a stopper might be injected into the body of a patient, etc., during injection into the patient, etc. CONSTITUTION: The stopper 2 made of an elastic material is freely slidably press fitted into the outside cylindrical part 11 on the cylinder tip part 13 side of the outside cylinder 10 of this injector. The plunger 3 made of the elastic material is freely slidably press fitted into the outside cylindrical part 11 on the aperture 14 side of the outside cylinder 10 of the injector. The specific amounts of injection liquid 4 is hermetically sealed in the outside cylinder 11 between the stopper 2 and the plunger 3. All the projecting parts 2b exclusive of the projecting part 2a existing nearest the cylindrical tip part 13 among the projecting part 2a, 2b of the stopper 2 are concavely provided with communicating grooves 2c running in the axial direction of the stopper.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a single-chamber container / syringe in which one kind of injection solution is sealed in advance in a syringe outer cylinder in an aseptic state and supplied to a medical field.

[0002]

2. Description of the Related Art A single-chamber type container / syringe A shown in FIGS. 4 and 5 is an example of a conventional product.
It is disclosed in Japanese Patent No. 8745.

In this single-chamber container / syringe A, a synthetic resin finger grip b is provided at one end of a glass outer cylinder a.
And a synthetic resin barrel tip portion c is fitted to the other end of the outer barrel portion a to form a syringe outer barrel d. The outer barrel portion of the syringe outer barrel d on the barrel tip portion c side. A stopper e made of rubber is slidably press-fitted into a, and a plunger g made of rubber is slidably press-fitted into the outer cylinder part a on the side of the opening f of the syringe outer cylinder d so that the plunger g A predetermined amount of the injection liquid h is sealed in the outer cylindrical portion a between the stopper e and the stopper e.

The plunger g has a plunger rod i.
Is detachably mounted, one end of the plunger rod i is projected from the opening f of the syringe outer cylinder d, and the outer peripheral surface of the plunger g and the stopper e are both inside the outer cylinder a. Three convex portions j that are in close contact with each other over the entire circumference are provided around the circumferential surface.

The convex portion j is provided around the outer peripheral surface of the plunger g and the outer peripheral surface of the stopper e because the plunger g and the stopper e are closely attached to the inner peripheral surface of the outer cylindrical portion a. The area is reduced as much as possible to ensure the close contact between the plunger g and the stopper e and the inner peripheral surface of the outer cylindrical portion a.
This is to improve the slidability of the plunger g and the stopper e.

However, when one convex portion j is provided around each of the outer peripheral surfaces of the plunger g and the stopper e,
When the plunger g and the stopper e are slid in the outer cylinder part a, the plunger g and the stopper e are moved to the outer cylinder part a.
Since it tilts inside and loses stability, two or more convex portions j are provided around the outer peripheral surface of the plunger g and the stopper e so that the plunger g and the stopper e can be secured inside the outer cylindrical portion a of the stopper e. The stability and smooth slidability are secured.

The barrel tip portion c of the syringe outer barrel d has an injection needle fixing portion k projecting outward from the bottom portion thereof, an inner chamber m continuous with the inner hole of the outer barrel portion a, and an injection needle fixing portion k. It has an injection needle communication hole n extending from the tip to the inner chamber m, the diameter D1 of the inner chamber m is set to be the same as or slightly larger than the inner diameter D2 of the outer tubular portion a, and the axial length of the inner chamber m is set. The length L1 is set to be slightly longer than the axial length L2 of the stopper e.

Then, on the inner wall surface of the barrel tip portion c forming the inner chamber m, one bypass groove p extending from the end surface o of the outer barrel portion a on the barrel tip portion c side to the injection needle communicating hole n of the barrel tip portion c. Is recessed, and the injection needle q is inserted and fixed to the injection needle communication hole n of the cylinder tip portion c within a range that does not project into the inner chamber m of the cylinder tip portion c, and the injection needle is fixed to the cylinder tip portion c. A cap r for protecting the injection needle q is tightly fitted to the portion k.

When the above-described single-chamber type syringe A used in a medical field or the like is used, the injection needle fixing portion k of the barrel tip portion c is used.
After removing the cap r from, the plunger rod i is pushed in the direction of the arrow X to slide the plunger g toward the inner chamber m of the cylinder tip portion c, as shown in FIG.

By this operation, the pressing force on the plunger rod i is transmitted to the stopper e via the injection liquid h,
When the stopper e slides toward the inner chamber m of the barrel tip portion c and is accommodated in the inner chamber m, the injection liquid h is depressed into the inner wall surface of the barrel tip portion c by the pressing force applied to the plunger rod i. It passes through the provided bypass groove p, reaches the injection needle communication hole n of the cylinder tip portion c, and is discharged from the tip of the injection needle q.

It should be noted that the single-chamber container / syringe A shown in FIG.
Then, the syringe outer cylinder d, the stopper e, the plunger g, and other parts are washed and sterilized prior to assembly, and a predetermined amount of the injection solution h is sealed in the syringe outer cylinder d to assemble the container / syringe A. A predetermined amount of the injection solution h is aseptically sealed in the syringe outer cylinder d by a method such as heat sterilizing the assembled container / syringe A with an autoclave.

For this reason, the single-chamber container / syringe A does not require much time and effort for injecting the injection liquid h as compared with a normal syringe for injecting a predetermined amount of the injection liquid h into a syringe at a medical site or the like. There is an advantage that there is no risk that bacteria, foreign substances, etc. will enter the syringe together with the injection liquid h when the injection liquid h is injected into the syringe.

By the way, when injecting the injection liquid h in the single-chamber container / syringe A into a patient or the like, an injection needle is provided so that the air in the syringe outer cylinder d is not injected into the body of the patient or the like. With the q facing upward, the air in the inner chamber m of the barrel tip c and the injection needle q
After pushing out the air inside with the injection solution h, the patient is injected with the injection needle q.

The inner peripheral surface of the outer cylindrical portion a and the stopper e
For the air S that is sealed between the convex portion j and the convex portion j, the stopper e is housed in the inner chamber m of the barrel tip portion c, and the injection liquid h
Even if the air moves through the bypass groove p of the cylinder tip portion c toward the injection needle communication hole n, the air S does not move together with the injection solution h toward the injection needle communication hole n, and the inner chamber m of the cylinder tip portion c does not move. The patient is stuck with the injection needle q after confirming that it remains in the position.

Note that, due to the viscosity of the injection liquid h, the cross-sectional area of the bypass groove p, etc., a part of the air S is directed toward the injection needle communication hole n together with the injection liquid h passing through the bypass groove p of the barrel tip portion c. When it moves, a part of this moved air S
After being discharged to the outside and confirming that the rest of the air S remains in the inner chamber m of the tube tip portion c, the injection needle q is pierced into the patient or the like.

However, in the conventional single-chamber type injector / combiner A, the air S retained in the inner chamber m of the barrel tip portion c may be injected into the body of a patient or the like during injection into the patient or the like. There was a problem that gave anxiety to doctors.

[0017]

SUMMARY OF THE INVENTION In view of the problems of the prior art, it is an object of the present invention to provide a single-chamber container / syringe which can eliminate the anxiety.

[0018]

As means for solving the above problems, in the present invention, a stopper made of an elastic material is slidably press-fitted into the outer cylinder portion of the syringe outer cylinder on the cylinder tip side,
A plunger made of an elastic material is slidably press-fitted into the outer cylinder part on the opening side of the syringe outer cylinder, and a predetermined amount of injection liquid is sealed in the outer cylinder part between the stopper and the plunger. , The diameter of the inner chamber of the cylinder tip portion continuous with the inner hole of the outer cylinder portion is set to be the same as or slightly larger than the inner diameter of the outer cylinder portion, and the axial length of the inner chamber is the axial length of the stopper. A bypass groove extending from the end surface of the outer cylinder portion on the cylinder tip side to the injection hole through the injection needle of the cylinder tip portion is formed on the inner wall surface of the cylinder tip portion that is set to be slightly longer than the inner chamber. On the outer peripheral surface, the following constitution is added to the single-chamber container / syringe in which two or more convex portions that are in close contact with the inner peripheral surface of the outer cylinder portion are provided all around.

That is, according to the present invention, all the convex portions of the convex portion of the stopper except the convex portion located closest to the cylinder tip portion are provided with the communicating grooves running in the axial direction of the stopper. Is added to the one-chamber type container / syringe injector.

[0020]

In the present invention, as shown in FIGS. 2 and 3, of the convex portions 2a and 2b of the stopper 2, the convex portion arranged closest to the cylinder tip portion 13 (see FIG. 1). A communicating groove 2c that runs in the axial direction of the stopper 2 is provided as a recess in all the convex portions 2b except 2a.

Therefore, as shown in FIG. 1, the convex portion 2a of the stopper 2 is connected to the barrel tip portion 13 of the syringe outer barrel 10.
When the stopper 2 is placed close to the inside of the outer cylinder 11 of the syringe outer cylinder 10 and then the outer cylinder 11 is evacuated,
Inner peripheral surface of the outer cylinder portion 11 and the convex portions 2a, 2b of the stopper 2
The space V formed between and becomes a vacuum state. Then, when a predetermined amount of the injection liquid 4 is injected into the outer cylinder portion 11 in a vacuum environment, the injection liquid 4 passes through the communication groove 2c of the stopper 2. To enter the vacuum space V and finally fill the space V.

Therefore, in the single-chamber type container / syringe 1 according to the present invention, the injection liquid 4 is injected into the space V formed between the inner peripheral surface of the outer cylinder portion 11 and the convex portions 2a and 2b of the stopper 2. Air can be evacuated from this space V by filling it.

After injecting a predetermined amount of the injection liquid 4 into the outer cylinder portion 11 under a vacuum environment, the plunger 3 is then press-fitted into the outer cylinder portion 11 under a vacuum environment so that the syringe outer cylinder 10 By completing the sealing of the injection liquid 4 in the outer cylinder portion 11 and releasing the vacuum, the filling work of the injection liquid 4 in the outer cylinder portion 11 is completed.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A single-chamber type container / syringe 1 shown in FIG. 1 is an example of an embodiment of the present invention, in which a synthetic resin finger grip 1 is provided at one end of an outer cylindrical portion 11 made of glass or plastic.
2 is fitted, and a barrel tip portion 13 made of synthetic resin is fitted to the other end of the outer barrel portion 11 to form the syringe outer barrel 10.
The stopper 2 made of an elastic material such as rubber is slidably press-fitted into the outer cylinder portion 11 of the syringe outer cylinder 10 on the cylinder tip 13 side,
The plunger 3 made of an elastic material such as rubber is slidably press-fitted into the outer cylinder portion 11 on the opening 14 side of the syringe outer cylinder 10,
A predetermined amount of the injection liquid 4 is sealed in the outer cylinder portion 11 between the plunger 3 and the stopper 2.

The plunger 3 has a plunger rod 5
Is removably attached, one end of the plunger rod 5 is projected from the opening 14 of the syringe outer cylinder 10, and the outer peripheral surface of the plunger 3 is entirely surrounded by the inner peripheral surface of the outer cylindrical portion 11. The three convex portions 3a that are in close contact with each other are provided around,
On the outer peripheral surface of the stopper 2, two convex portions 2a and 2b are provided around the inner peripheral surface of the outer cylindrical portion 11 so as to be in close contact with each other over the entire circumference.

As shown in FIGS. 2 and 3, the stopper 2 has a convex portion 2a, 2b other than the convex portion 2a disposed closest to the cylinder tip portion 13 among the convex portions 2a, 2b. Shape 2
Six communication grooves 2c running in the axial direction of the stopper 2 are provided in b.

The barrel tip portion 13 of the syringe barrel 10 shown in FIG.
Is a luer lock type injection needle fixing portion 13b protrudingly provided on the outer side of the bottom portion 13a thereof, an inner chamber 13c continuous with the inner hole of the outer tubular portion 11, and a distal end of the injection needle fixing portion 13b to the inner chamber 13
c has an injection needle communication hole 13d leading to the inner chamber 13
The diameter D3 of c is set to be equal to or slightly larger than the inner diameter D4 of the outer tubular portion 11, and the axial length L3 of the inner chamber 13c is set to be slightly longer than the axial length L4 of the stopper 2.

The cylinder tip portion 13 forming the inner chamber 13c
The inner wall surface of the outer cylinder portion 11 has an end surface 11a on the cylinder tip 13 side.
Four bypass grooves 13e extending from to the injection needle communicating hole 13d of the cylinder tip portion 13 are recessed, and the injection needle 6 is attached to the injection needle fixing portion 13b of the cylinder tip portion 13.

In order to seal a predetermined amount of the injection solution 4 in the syringe outer cylinder 10 of the single-chamber type combined syringe 1, the convex portion 2a of the stopper 2 is arranged near the cylinder tip 13 of the syringe outer cylinder 10. Then, the stopper 2 is press-fitted into the outer cylinder portion 11 of the syringe outer cylinder 10, and a predetermined amount of the injection solution 4 is injected into the outer cylinder portion 11 under the vacuum environment, and the plunger 3 is inserted into the outer cylinder portion 11. Press-fit to inject the solution 4 into the outer cylinder part 11 of the syringe outer cylinder 10.
The vacuum is released after the hermetic sealing is completed.

Alternatively, the finger grip 12 is fitted to one end of the outer cylinder portion 11, and the plunger 3 is press-fitted into the inside of the outer cylinder portion 11 on the side of the finger grip 12 so that the outer cylinder portion 11 of the outer cylinder portion 11 is kept in a vacuum environment. Injection solution 4 from the other end
Is injected into the outer cylinder portion 11 to attach the stopper 2 to the outer cylinder portion 11
After press-fitting into the outer cylinder portion 11 to complete the sealing of the injection liquid 4 into the outer cylinder portion 11, the vacuum is released, and the cylinder tip portion 13 is fitted to the other end of the outer cylinder portion 11 to obtain a predetermined amount of the injection liquid 4 You may complete the syringe outer cylinder 10 with which was sealed.

Paragraph No. 000 is used for the explanation of the operation when the single-chamber container / syringe 1 is used in a medical field or the like.
9 and 0010, which is the same as the description of the operation when the conventional single-chamber container / syringe A shown in FIG.

By the way, in the illustrated embodiment described above,
The stopper 2 has two convex portions 2a and 2b, and the convex portion 2b has six communicating grooves 2c recessed therein. However, the number of convex portions of the stopper is not limited to two, and
It is sufficient if the number is equal to or more than four, and the number of communication grooves recessed in all of the convex portions except the convex portion arranged at the position closest to the cylinder tip is limited to six. However, it is sufficient that the number is one or more.

In the illustrated embodiment, the barrel tip portion 13 of the syringe barrel 10 is made of synthetic resin and is fitted to the end of the barrel portion 11. However, the barrel tip of the syringe barrel is
The material is not limited to synthetic resin, and may be glass or the like, and the method of connecting with the outer cylinder is not limited to fitting, and may be formed integrally with the outer cylinder, or may be bonded or the like. May be

Further, in the illustrated embodiment, four bypass grooves 13e are provided in the inner wall surface of the cylinder tip portion 13 forming the inner chamber 13c. However, the number of bypass grooves recessed in the inner wall surface of the cylinder tip is not limited to four, and may be one or more.

[0035]

In the single-chamber container / syringe according to the present invention, the space formed between the inner peripheral surface of the outer cylinder portion and the convex portion of the stopper is filled with the injection liquid, and air is injected from this space. Therefore, it is possible to eliminate the anxiety that the air in the space is injected into the body of the patient or the like during the injection into the patient or the like.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an example of an embodiment of the present invention.

FIG. 2 is a plan view showing a stopper in FIG.

FIG. 3 is a sectional view taken along line ZZ of the one shown in FIG.

FIG. 4 is a vertical sectional view showing an example of a conventional product.

5 is a sectional view taken along line YY of the one shown in FIG.

FIG. 6 is a vertical cross-sectional view showing a state when the one shown in FIG. 4 is used.

[Explanation of symbols]

 1 1-chamber type container-combined syringe 2 Stoppers 2a, 2b Convex portion of stopper 2c Communication groove 3 Plunger 4 Injection liquid 10 Syringe outer cylinder 11 Outer cylinder part 11a End surface of cylinder part of outer cylinder part 13 Cylinder tip part 13c Cylinder tip part Inner chamber 13d Injection needle communication hole 13e Bypass groove 14 Syringe outer cylinder opening D3 Inner chamber diameter D4 Outer cylinder inner diameter L3 Inner chamber axial length L4 Stopper axial length

Claims (1)

[Claims] 1. A stopper made of an elastic material is slidably press-fitted into an outer cylinder portion of a syringe outer cylinder at a tip end side thereof, and a plunger made of an elastic material is inserted in an outer cylinder portion of an opening side of the syringe outer cylinder. The injection liquid is press-fitted slidably, and a predetermined amount of the injection liquid is sealed in the outer cylinder part between the stopper and the plunger, and the diameter of the inner chamber of the cylinder tip part continuous with the inner hole of the outer cylinder part is It is set to be equal to or slightly larger than the inner diameter of the outer cylinder part, and the axial length of the inner chamber is set to be slightly longer than the axial length of the stopper. Is
A bypass groove is recessed from the end surface of the outer cylinder portion on the cylinder tip side to the injection hole communication hole of the cylinder tip portion, and the outer peripheral surface of the stopper is in close contact with the inner peripheral surface of the outer cylinder portion over the entire circumference. In the single-chamber container-combined syringe in which more than one convex portion is provided, in all the convex portions of the convex portion of the stopper except for the convex portion located closest to the tip of the cylinder, A single-chamber type combined container-syringe characterized in that a communication groove running in the axial direction of the stopper is provided as a recess.