JPH08141091A - Injector in common use as two chamber type vessel - Google Patents

Abstract

PURPOSE: To eliminate the anxiety about the possibility that the air expelled from the inside of the space formed between the inner peripheral surface of the outside cylindrical part of the outside cylinder of an injector and the projecting parts of a second stopper might be partly injected into the body of a patient, etc. CONSTITUTION: The first stopper 2 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 is freely slidably press fitted into the outside cylinder part 11 on the aperture 14 of the outside cylinder 10 of the injector. The second stopper 4 is freely slidably press fitted into the outside cylindrical part 11 between the first stopper 2 and the plunger 3. A first injection liquid 5 is hermetically sealed into the outside cylindrical part 11 between the first stopper 2 and the second stopper 4. A second injection liquid 6 is hermetically sealed into the outside cylindrical part 11 between the second stopper 4 and the plunger 3. All the projecting parts 4a exclusive of an arbitrary one projecting part 4b among the projecting parts 4a, 4b of the second stopper 4 are concavely provided with communicating grooves 4c running in the axial direction of the second stopper 4.

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 two-chamber type combined container / syringe in which two kinds of injection liquids are previously separated and sealed in a syringe outer cylinder in an aseptic state and supplied to a medical site or the like. .

[0002]

2. Description of the Related Art The two-chamber type syringe / combiner A shown in FIGS. 6 to 10 is proposed in 1993 Japanese Patent Application No. 205904 filed by the present applicant.

In this two-chamber type syringe / combiner A, as shown in FIG. 6, a finger grip b is fitted to one end of an outer cylinder part a, and a cylinder tip part c is attached to the other end of the outer cylinder part a. The syringe outer cylinder d is formed by being fitted, and the first stopper e made of an elastic material such as rubber is slidably press-fitted into the outer cylinder part a on the cylinder tip portion side of the syringe outer cylinder d. A plunger g made of an elastic material such as rubber is provided in the outer cylinder part a on the opening f side of the syringe outer cylinder d.
Is slidably press-fitted, and the second stopper h made of an elastic material such as rubber is slidably press-fitted into the outer cylindrical portion a between the first stopper e and the plunger g, so that the first stopper e A predetermined amount of the first injection liquid i is sealed in the outer cylindrical portion a between the second stopper h and the plunger g.
A predetermined amount of the second injection liquid j is sealed in the outer cylinder portion a between the and.

The plunger g has a plunger rod k.
Is removably attached, one end of the plunger rod k is projected from the opening f of the syringe outer cylinder d, and both of the plunger g and the outer peripheral surface of the first stopper e are
Three convex portions m are provided around the inner peripheral surface of the outer cylindrical portion a so as to be in close contact therewith, and the outer peripheral surface of the second stopper h covers the entire inner peripheral surface of the outer cylindrical portion a. Two convex portions m that are in close contact with each other are provided around.

Incidentally, the plunger g and the first stopper e
The convex portion m is provided around each outer peripheral surface of the second stopper h and the plunger g, the first stopper e, and the second stopper e.
The contact area between the stopper h and the inner peripheral surface of the outer cylindrical portion a is reduced as much as possible to ensure the close contact between the plunger g, the first stopper e and the second stopper h and the inner peripheral surface of the outer cylindrical portion a. Meanwhile, the plunger g, the first stopper e and the second
This is to improve the slidability of the stopper h.

However, when one convex portion m is provided around each of the outer peripheral surfaces of the plunger g, the first stopper e and the second stopper h, the plunger g, the first stopper e and the second stopper are provided. When h is slid in the outer cylinder part a, the plunger g, the first stopper e, and the second stopper h are tilted in the outer cylinder part a and lack stability, so that the plunger g, Two or more convex portions m are provided around the outer peripheral surfaces of the first stopper e and the second stopper h, respectively, to stabilize the plunger g, the first stopper e and the second stopper h in the outer cylindrical portion a. And smooth sliding properties are ensured.

The barrel tip c of the syringe barrel d has a luer lock type needle fixing portion n protruding from the bottom of the barrel, an inner chamber o continuous with the inner hole of the barrel portion a, and a needle. It has an injection needle communication hole p extending from the tip of the fixed part n to the inner chamber o, and the diameter D1 of the inner chamber o is set to be the same as or slightly larger than the inner diameter D2 of the outer cylinder part a. The axial length L1 is set to be slightly longer than the total length of the axial length L2 of the first stopper e and the axial length L3 of the second stopper h.

Then, on the inner wall surface of the barrel tip portion c forming the inner chamber o, four bypass grooves r extending from the end face q of the outer barrel portion a on the barrel tip portion c side to the injection hole communicating hole p of the barrel tip portion c. Is recessed, and an injection needle s is attached to the injection needle fixing portion n of the barrel tip portion c.

By using the two-chamber type injector / combiner A described above in a medical field or the like, the first and second injection solutions i and j sealed in the outer cylinder part a of the syringe outer cylinder d are continuously supplied. For injection, as shown in FIGS. 7-10, the plunger rod k
Push in the direction of arrow X to move the plunger g into the cylinder tip c.
It is sufficient to slide it toward the inner chamber o.

That is, as shown in FIG. 7, when the plunger rod k is pushed in the direction of arrow X, the pushing force on the plunger rod k is transmitted to the second stopper h via the second injection liquid j, The pressing force transmitted to the second stopper h is transmitted to the first stopper e via the first injection solution i, so that the second stopper h and the first stopper e are separated from each other by the cylinder tip portion c.
Sliding toward the inner chamber o of the first stopper e
When stored in the inside, the sealing property of the first stopper e is lost, and the first injection liquid i continues to have the plunger rod k.
Is applied to the inner chamber o of the cylinder tip portion c through the bypass groove r formed in the inner wall surface of the cylinder tip portion c.
The air inside and the air inside the injection needle s are discharged to the outside of the syringe A, and are discharged from the tip of the injection needle s.

Then, as shown in FIG. 8, when the second stopper h comes into contact with the first stopper e, the entire amount of the first injection liquid i flows into the inner chamber o of the cylinder tip portion c through the bypass groove r. , As shown in FIG. 9, both the first and second stoppers e,
When h is housed in the inner chamber o, the sealing property of the second stopper h is lost, so that the second injection liquid j is now bypassed by the cylindrical tip portion c due to the continuous pressing force on the plunger rod k. It passes through the groove r and reaches the injection needle communication hole p of the cylinder tip portion c,
It comes to be ejected from the tip of the injection needle s.

Then, as shown in FIG. 10, the plunger g comes into contact with the second stopper h, whereby the injection needle s
The discharge of the second injection solution j from the tip of the is completed.

It should be noted that the two-chamber type combined syringe A shown in FIG.
Then, the parts such as the syringe outer cylinder d, the plunger g, and the first and second stoppers e and h are washed and sterilized prior to assembly, and a predetermined amount of the first and second injection solutions i and j are injected into the syringe outer cylinder. A predetermined amount of the first and second injection solutions i, j are assembled by a method of assembling the container / syringe A sealed in d, and sterilizing the assembled container / syringe A with an autoclave.
Is aseptically sealed in the syringe outer cylinder d.

For this reason, the two-chamber type syringe / combined syringe A is different from a normal syringe in which a predetermined amount of the first and second injection solutions i and j are individually injected into the syringe at a medical site or the like. The injection of the first and second injection solutions i, j does not take time, and bacteria and foreign substances are injected into the injection apparatus together with the injection solutions i, j when the first and second injection solutions i, j are injected into a normal injection apparatus. It has the advantages that there is no risk of intrusion and that two types of injection solutions can be continuously injected by a single injection operation using a single injector.

By the way, the first of the two-chamber type syringe / combiner A
When injecting the second injection liquid i, j into a patient or the like, the needle s is directed upward so that the air in the syringe outer cylinder d is not injected into the body of the patient or the like, and the tube tip portion is After the air inside c and the air inside the injection needle s are pushed out of the syringe A by the first injection solution i, the injection needle s is pierced into the patient or the like for injection.

Regarding the air in the space T formed between the inner peripheral surface of the outer cylinder portion a and the convex portion m of the first stopper e, the first stopper h is inside the inner chamber o of the cylinder tip portion c. Even if the first injection solution i is stored in the first injection solution i and passes through the bypass groove r of the barrel tip portion c toward the injection needle communication hole p, the air flows together with the first injection solution i toward the injection needle communication hole p. After confirming that it does not move, the injection needle s is pierced into the patient or the like.

The viscosity of the first injection liquid i and the bypass groove r
When a part of the air in the space T moves toward the injection needle communication hole p together with the first injection liquid i passing through the bypass groove r due to the cross-sectional area of the The remaining part of the air discharged to the outside of the syringe A passes through the bypass groove r
After confirming that the injection needle i does not move toward the injection needle communication hole p together with the injection liquid i, the injection needle s is pierced into the patient or the like.

However, with respect to the air in the space U formed between the inner peripheral surface of the outer tubular portion a and the convex portion m of the second stopper h, the inside of the inner chamber o of the tubular tip portion c together with the second stopper h. When the viscosity of the second injection solution j is low, a part of the air in the space U is injected together with the second injection solution j passing through the bypass groove r of the barrel tip portion c because it moves during injection into a patient or the like. There is a risk that the needle moves to the needle communication hole p and is injected into the body of a patient or the like.

When the viscosity of the second injection solution j is high, there is no danger, but the danger is visually given to a doctor or the like to make the doctor or the like anxious.

Therefore, in the conventional two-chamber type syringe / combiner A, when the viscosity of the second injection liquid j is low, the space between the inner peripheral surface of the outer cylindrical portion a and the convex portion m of the second stopper h is increased. There is a risk that a part of the air in the space U formed in will be injected into the body of a patient or the like together with the second injection solution j, and if the viscosity of the second injection solution j is high, the above-mentioned risk may occur. There was a problem in that it was given visually and made doctors anxious.

[0021]

In view of the above problems of the prior art, in the present invention, a part of the air in the space formed between the inner peripheral surface of the outer tubular portion and the convex portion of the second stopper. It is an object of the present invention to provide a two-chamber type combined syringe which can eliminate the risk of being injected into the body of a patient or the like together with the second injection solution.

[0022]

As a means for solving the above-mentioned problems, in the invention of claim 1, a first stopper made of an elastic material is slidable in the outer cylinder portion of the syringe outer cylinder on the cylinder tip side. The plunger made of an elastic material is press-fitted, and is slidably press-fitted into the outer cylinder portion on the opening side of the syringe outer cylinder.
A second stopper made of an elastic material is slidably press-fitted into the outer cylinder portion between the stopper and the plunger, and a predetermined amount of the first injection is made in the outer cylinder portion between the first stopper and the second stopper. The liquid is sealed, and a predetermined amount of the second injection liquid is sealed in the outer cylinder part between the second 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 set to be equal to or slightly larger than the inner diameter of the outer tubular portion, and the axial length of the inner chamber is slightly longer than the sum of the axial length of the first stopper and the axial length of the second stopper. A bypass groove extending from the end surface of the outer cylinder portion on the cylinder tip portion side to the injection needle communication hole of the cylinder tip portion is recessed on the inner wall surface of the cylinder tip portion forming the inner chamber, and at least the outer periphery of the second stopper is formed. The surface has two or more convex portions that are in close contact with the inner peripheral surface of the outer tubular portion over the entire circumference. The dual chamber prefillable syringe which is circumferentially provided are added the following configuration.

That is, in the invention of claim 1, the second
In the above-mentioned two chambers, the stopper is provided with a communication groove that runs in the axial direction of the second stopper on all of the convex portions except one arbitrary convex portion. It is added to the syringe that also serves as a container.

According to the second aspect of the invention, in the convex portion of the second stopper, one convex portion in which the communicating groove is not provided is arranged closest to the plunger. The syringe is added to the dual-chamber type combined syringe of claim 1.

According to the third aspect of the invention, the outer peripheral surface of the first stopper is provided with two or more convex portions which are in close contact with the inner peripheral surface of the outer cylinder portion of the syringe outer cylinder over the entire circumference. Of all the convex portions of the first stopper except the convex portion located closest to the tip of the syringe outer cylinder, the communication of the first stopper running in the axial direction of the first stopper is established. The configuration in which the groove is provided is added to the two-chamber type combined container / syringe injector according to the first or second aspect.

[0026]

In the first aspect of the present invention, as shown in FIGS. 2 and 3, in the convex portions 4a and 4b of the second stopper 4,
A communicating groove 4c that runs in the axial direction of the second stopper 4 is provided in all the convex portions 4a except one arbitrary convex portion 4b.

Therefore, as shown in FIG. 1, after the first stopper 2 is press-fitted into the outer cylinder portion 11 of the syringe outer cylinder 10, a predetermined amount of the first injection solution 5 is placed in a vacuum environment. The convex portion 4a of the second stopper 4 is first injected into the outer cylindrical portion 11
The second stopper 4 is arranged on the injection liquid 5 side and the outer cylinder portion 11 is provided.
When the first injection solution 5 is sealed in the outer cylinder portion 11 by press-fitting into the inside, the inner peripheral surface of the outer cylinder portion 11 and the convex portion 4a of the second stopper 4 are processed during the process under the above vacuum environment. , 4b is in a vacuum state, and the first injection solution 5 in the outer cylinder part 11 is the second stopper 4 into the outer cylinder part 11.
Due to the pressure at the time of press-fitting of the second stopper 4
Enters the vacuum space V through the communication groove 4c of
Will eventually be met.

Then, in a vacuum environment, a predetermined amount of the second injection liquid 6 is injected into the outer cylinder portion 11, the plunger 3 is press-fitted into the outer cylinder portion 11, and the outer cylinder portion of the syringe outer cylinder 10 is injected. After the sealing of the second injection liquid 6 into the inside 11 is completed, the vacuum is released, so that the first and second injection liquids 5 and 6 inside the outer cylinder part 11 are released.
Is completed.

Incidentally, the two-chamber type syringe / combiner 1 shown in FIG.
When the convex portion 4a of the second stopper 4 in which the communication groove 4c is recessed is arranged on the second injection liquid 6 side, and the second stopper 4 is press-fitted into the outer cylinder portion 11 under vacuum environment. When a predetermined amount of the second injection liquid 6 is injected into the outer cylinder portion 11 under a vacuum environment, the second injection liquid 6 passes through the communication groove 4c of the convex portion 4a of the second stopper 4. Enter the vacuum space V,
Eventually, this space V will be filled.

Therefore, for example, three or more convex portions are provided around the outer peripheral surface of the second stopper, and all except one convex portion located in the middle of the three or more convex portions. When the communication groove is provided in the convex portion of the above, the one convex portion in the space formed between the inner peripheral surface of the outer tubular portion and the convex portion of the second stopper is formed. The space closer to the first injection liquid than the portion can be filled with the first injection liquid, and the space closer to the second injection liquid than the one convex portion can be filled with the second injection liquid.

Therefore, according to the first aspect of the invention, all the convex portions of the convex portion of the second stopper except one convex portion communicate with the communicating groove that runs in the axial direction of the second stopper. Since the recess is provided, it is possible to fill the space formed between the inner peripheral surface of the outer cylindrical portion and the convex portion of the second stopper with the injection liquid and remove air from this space.

According to the second aspect of the invention, as shown in FIG. 1, one convex portion 4b in which the communicating groove 4c is not provided in the convex portions 4a and 4b of the second stopper 4 is provided. However, since it is disposed closest to the plunger 3, it is disposed closest to the plunger 3 when injecting a patient or the like by using the dual-chamber injector 1 according to claim 2. The convex portion 4b of the second stopper 4 is the inner chamber 1 of the barrel tip portion 13.
The sealing property of the second stopper 4 is not lost until it is stored in the inside 3c, and as a result, the convex portion 4b of the second stopper 4 is stored in the inner chamber 13c of the barrel tip portion 13 of the second injection solution 6. Until the above, the bypass groove 13e recessed in the inner wall surface of the cylinder tip portion 13 cannot penetrate.

Then, when the convex portion 4b of the second stopper 4 is housed in the inner chamber 13c of the barrel tip portion 13,
The convex portion 4b of the stopper 4 is disposed closest to the plunger 3, and the axial length L4 of the inner chamber 13c is the axial length L5 of the first stopper 2 and the second stopper 4
Since it is set to be slightly longer than the sum of the length L6 of the first stopper 2 in the axial direction, the end surface 2e of the first stopper 2 on the injection needle 8 side is almost in contact with the inner surface of the bottom portion 13a of the barrel tip portion 13, and The first injection liquid 5 is almost discharged from the inner chamber 13c of the barrel tip 13.

On the other hand, for example, of the convex portions 4a and 4b of the second stopper 4, one convex portion in which the communication groove 4c is not provided is arranged closest to the first stopper 2. In the case of the convex portion 4a having the
When the convex portion 4 a of the second stopper 4 is housed in the inner chamber 13 c of the barrel tip portion 13, the second injection solution 6 has the convex portion 4 a of the second stopper 4.
It penetrates into the bypass groove 13e of the cylinder tip portion 13 through the communication groove 4c recessed in b.

At the time of this penetration, the end surface 2e of the first stopper 2 on the side of the injection needle 8 and the bottom portion 1 of the barrel tip portion 13 are formed.
There is still a distance from the inner surface of 3a, and the interior 1 of this distance
Since the first injection solution 5 remains in 3c, the second injection solution 6 passes through the bypass groove 13e and mixes with the remaining first injection solution 5 in the inner chamber 13c.

Therefore, the convex portion 4a of the second stopper 4 is
In the invention of claim 2, one convex portion 4b in which the communication groove 4c is not provided in the 4b is arranged closest to the plunger 3, and the first convex portion 4b is provided at the time of injection into a patient or the like. The possibility that the second injection solution 6 and the first injection solution 5 are mixed can be minimized.

According to the third aspect of the invention, as shown in FIGS. 1, 4 and 5, the entire circumference is formed on the outer peripheral surface of the first stopper 2 and the inner peripheral surface of the outer cylinder portion 11 of the syringe outer cylinder 10. Two or more convex portions 2a, 2b, 2c that are closely attached to each other are provided around the convex portion 2a, 2b, 2c of the first stopper 2. All the convex portions 2b and 2c except the convex portion 2a located near 13 are connected to the communicating groove 2 of the first stopper 2 which runs in the axial direction of the first stopper 2.
d is recessed.

For this reason, as shown in FIG. 1, after the first stopper 2 is press-fitted into the outer cylinder portion 11 of the syringe outer cylinder 10, the outer cylinder portion 11 is evacuated. The space W formed between the inner peripheral surface of the first stopper 2 and the convex portions 2a, 2b, 2c of the first stopper 2 is in a vacuum state, and then a predetermined amount of the first injection solution 5 is placed under a vacuum environment in the outer cylinder. When injected into the portion 11, the first injection solution 5 is supplied to the convex portion 2b of the first stopper 2,
It penetrates into the vacuum space W through the communication groove 2d recessed in 2c and finally fills this space W.

Therefore, in the invention of claim 3, the outer cylinder portion 11
Inner peripheral surface and convex portions 2a, 2b, 2c of the first stopper 2
The space W formed between and can be filled with the first injection solution 5 to remove air from the space W.

[0040]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A two-chamber type container / syringe 1 shown in FIG. 1 is an example of an embodiment in which the inventions of claims 1, 2 and 3 are combined, and one end of an outer cylindrical portion 11 made of glass or plastic. A finger grip 12 made of synthetic resin is fitted to the above, and a cylinder tip portion 13 made of synthetic resin is fitted to the other end of the outer cylinder portion 11,
The syringe outer cylinder 10 is formed, and the syringe outer cylinder 10 is formed.
The first stopper 2 made of an elastic material such as rubber is slidably press-fitted into the outer cylinder portion 11 on the cylinder tip portion 13 side of the syringe outer cylinder 10.
The plunger 3 made of an elastic material such as rubber is slidably press-fitted into the outer cylindrical portion 11 of the opening 14 side of the first stopper 2
A second stopper 4 made of an elastic material such as rubber is slidably press-fitted into the outer cylindrical portion 11 between the plunger 3 and the plunger 3.

A predetermined amount of the first injection solution 5 is sealed in the outer cylinder portion 11 between the first stopper 2 and the second stopper 4, and the outer cylinder between the second stopper 4 and the plunger 3 is sealed. A predetermined amount of the second injection solution 6 is sealed in the part 11,
A plunger rod 7 is detachably attached to the plunger 3, and one end of the plunger rod 7 is projected from the opening 14 of the syringe outer cylinder 10.

The outer cylinder portion 11 is provided on the outer peripheral surface of the plunger 3.
Is provided with three convex portions 3a which are in close contact with the inner peripheral surface of the outer peripheral surface of the second stopper 4, and the outer peripheral surface of the second stopper 4 is in close contact with the inner peripheral surface of the outer cylindrical portion 11 over the entire peripheral surface. Two convex portions 4a, 4b
Is provided around the outer peripheral surface of the first stopper 2, and the outer cylindrical portion 1
The three convex portions 2a, which are in close contact with the inner peripheral surface of 1, over the entire circumference,
2b and 2c are provided around.

As shown in FIGS. 1, 2 and 3, the second stopper 4 has convex portions 4a and 4b.
Of the convex portion 4 that is arranged closest to the plunger 3
Six communicating grooves 4c that run in the axial direction of the second stopper 4 are recessed in the convex portion 4a other than b.

The first stopper 2 is shown in FIGS.
As shown in FIG. 2, the shafts of the first stopper 2 are attached to the convex portions 2b, 2c other than the convex portion 2a arranged closest to the cylinder tip portion 13 among the convex portions 2a, 2b, 2c. Six communication grooves 2d running in the direction are recessed.

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 the same as or slightly larger than the inner diameter D4 of the outer tubular portion 11, and the axial length L4 of the inner chamber 13c is the first
It is set to be slightly longer than the sum of the axial length L5 of the stopper 2 and the axial length L6 of the second stopper 4.

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.
There are four bypass grooves 13e recessed from the cylinder tip portion 13 to the injection needle communication hole 13d, and the injection needle 8 is detachably attached to the injection needle fixing portion 13b of the cylinder tip portion 13.

In order to seal the predetermined amounts of the first and second injection solutions 5 and 6 in the syringe outer cylinder 10 of the two-chamber type syringe / combiner 1 described above, the convex portion 2a of the first stopper 2 is used.
Is arranged near the barrel tip portion 13 of the syringe outer barrel 10, and the first stopper 2 is press-fitted into the outer barrel portion 11 of the syringe outer barrel 10.
In a vacuum environment, a predetermined amount of the first injection solution 5 is put into the outer cylinder part 1
1, the convex portion 4a of the second stopper 4 is arranged on the first injection liquid 5 side, and the second stopper 4 is attached to the syringe outer cylinder 1.
0 into the outer cylinder part 11, a predetermined amount of the second injection liquid 6 is injected into the outer cylinder part 11, the plunger 3 is pressed into the outer cylinder part 11, and the outer cylinder of the syringe outer cylinder 10 After completing the sealing of the first and second injection solutions 5 and 6 in the part 11, the vacuum is released.

Alternatively, the finger grip 12 is fitted to one end of the outer cylinder portion 11, the plunger 3 is press-fitted into the outer cylinder portion 11 on the finger grip 12 side, and the other end of the outer cylinder portion 11 is placed in a vacuum environment. From the prescribed amount of the second injection 6
Is injected into the outer cylinder portion 11, the second stopper 4 is press-fitted into the outer cylinder portion 11, a predetermined amount of the first injection solution 5 is injected into the outer cylinder portion 11, and the first stopper 4 is removed. After press-fitting into the tubular portion 11 and completing sealing of the first and second injection solutions 5 and 6 into the outer tubular portion 11, the vacuum is released, and the tubular tip portion 13 is fitted to the other end of the outer tubular portion 11. Put on the prescribed amount of the first and second injection solutions 5,
The syringe outer cylinder 10 in which 6 is sealed may be completed.

Paragraph No. 000 is for the explanation of the action when the dual-chamber syringe / syringe 1 is used in a medical field.
9 to 0012, the description thereof is the same as the operation when the conventional two-chamber type container / syringe A shown in FIG.

By the way, in the illustrated embodiment described above,
The second stopper 4 has two convex portions 4a and 4b and six communication grooves 2c recessed in the convex portion 4a.
However, the number of convex portions of the second stopper is not limited to two, and may be two or more. Further, among the convex portions, the convex portion arranged at the position closest to the plunger may be used. The number of communication grooves that are provided as recesses in all the convex portions except is not limited to six, and may be one or more.

In the illustrated embodiment, the first, second and third aspects are provided.
Since it is an example of the implementation of each invention of the
One of the convex portions 4a and 4b of the stopper 4 in which the communication groove 4c is not provided is disposed closest to the plunger 3, but the two chambers according to claim 1 are provided. In the double-sided container / syringe, one convex portion of the convex portion of the second stopper in which the communication groove is not provided does not need to be disposed closest to the plunger.

In the illustrated embodiment, the first stopper 2 has three convex portions 2a, 2b, 2c, and the convex portions 2b, 2c other than the convex portion 2a arranged closest to the cylinder tip portion 13 are Six communication grooves 2d running in the axial direction of the first stopper 2 are recessed. However, the number of convex parts of the first stopper is 3
The present invention is not limited to a book, and it is sufficient that the number is two or more. Further, among the convex parts, the communication groove provided as a recess in all convex parts except the convex part arranged at the position closest to the cylinder tip part. Is not limited to 6 and may be 1 or more.

In the illustrated embodiment, the barrel tip portion 13 of the syringe outer barrel 10 is made of synthetic resin and is fitted to the end portion of the outer 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 recessed 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.

[0055]

According to the first aspect of the present invention, the space formed between the inner peripheral surface of the outer cylindrical portion and the convex portion of the second stopper is filled with the injection liquid, and air is removed from this space. Therefore, it is possible to eliminate the risk that a part of the air in the space is injected into the body of a patient or the like together with the second injection solution.

In the invention of claim 2, the possibility of mixing the second injection solution and the first injection solution at the time of injection into a patient or the like can be minimized. The injection solution of can be continuously injected by only one injection operation with a single injector.

According to the third aspect of the present invention, the space formed between the inner peripheral surface of the outer cylinder portion and the convex portion of the first stopper is filled with the first injection liquid, and air is removed from this space. Therefore, it is possible to eliminate the anxiety that the air in the space may be injected into the body of a patient or the like together with the injection liquid.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of an embodiment in which the inventions of claims 1, 2 and 3 are combined.

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

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

FIG. 4 is a plan view showing a first stopper in FIG.

5 is a cross-sectional view taken along line ZZ of what is shown in FIG.

FIG. 6 is a vertical sectional view showing an example of a conventional product.

7 is a longitudinal sectional view showing a state of the plunger rod shown in FIG. 6 in an initial stage of pushing.

8 is a longitudinal sectional view showing a state of the plunger rod shown in FIG. 6 in the middle of pushing.

9 is a vertical cross-sectional view showing the state of the pushing end of the plunger rod shown in FIG.

FIG. 10 is a vertical cross-sectional view showing the state shown in FIG. 6 when the injection is completed.

[Explanation of symbols]

 1 Two-chamber type container and syringe 2 First stopper 2a, 2b, 2c Convex portion of the first stopper 2d Communication groove of the first stopper 3 Plunger 4 Second stopper 4a, 4b Convex portion of the second stopper 4c Second Communication groove of stopper 5 First injection solution 6 Second injection solution 10 Syringe outer cylinder 11 Outer cylinder part 11a End surface of cylinder part of outer cylinder part 13 Tube tip part 13c Inner chamber of tube tip part 13d Injection needle communication hole 13e Bypass groove 14 Syringe outer barrel opening D3 Inner chamber diameter D4 Outer barrel inner diameter L4 Inner chamber axial length L5 First stopper axial length L6 Second stopper axial length

Claims (3)

[Claims] 1. A first stopper made of an elastic material is slidably press-fitted into an outer cylinder portion of a syringe outer cylinder on a cylinder tip side thereof, and an elastic material plan is inserted in an outer cylinder portion of an opening side of the syringe outer cylinder. The jar is slidably press-fitted, and a second stopper made of an elastic material is slidably press-fitted into the outer cylindrical portion between the first stopper and the plunger, so that the first stopper and the second stopper are connected. A predetermined amount of the first injection liquid is hermetically sealed in the outer cylinder portion, and a predetermined amount of the second injection liquid is hermetically sealed in the outer cylinder portion between the second stopper and the plunger. The diameter of the inner chamber of the tip of the cylinder continuing to the hole is set to be the same as or slightly larger than the inner diameter of the outer cylinder, and the axial length of the inner chamber is the axial length of the first stopper and the second stopper. Is set to be slightly longer than the sum of the axial length of the inner chamber and the inner chamber to form the inner chamber. A bypass groove is formed on the inner wall surface of the barrel tip portion from the end surface on the barrel tip side of the outer barrel portion to the injection hole communicating hole of the barrel tip portion, and at least the outer peripheral surface of the second stopper has an inner wall of the outer barrel portion. A two-chamber type container / syringe in which two or more convex portions that are in close contact with each other all around the circumferential surface are provided, and an arbitrary one convex portion of the convex portions of the second stopper is provided. A communicating groove running in the axial direction of the second stopper is provided in all of the convex portions except the portion 2
Room-type container and syringe. 2. The two-chamber container according to claim 1, wherein one of the convex portions of the second stopper, in which the communicating groove is not provided, is arranged closest to the plunger. Dual-purpose syringe. 3. The outer peripheral surface of the first stopper is provided with two or more convex portions which are in close contact with the inner peripheral surface of the outer cylindrical portion of the syringe outer cylinder over the entire circumference. In all the convex portions of the convex portions of the syringe except the convex portion located closest to the tip of the syringe outer cylinder, the communication groove of the first stopper that runs in the axial direction of the first stopper is provided as a recess. The two-chamber type combined container / syringe according to claim 1 or 2.