JP2001061971A - Mixing injection tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mixing injection tube having no injection needle for preventing a back flow of blood. SOLUTION: An injection valve 13 having a base section 13a air-tightly contained engaging to a divaricate section 12b of a side section of a tube main body 12a, a trunk section 13c having an injector main body 10 on its inner periphery or a compressed section 13b of a tip small diameter tube section 10a, and a tip section 13f having a reverse stop valve 13e for tightly closing minus pressure produced within the trunk section 13c by pulling the injector after injecting is assembled through a lid body 14 to the divaricate section 12b of the mixing injection tube 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a co-infusion tube used for injecting a drug solution or other liquid into a blood circuit, an infusion circuit or the like of an artificial kidney.

[0002]

2. Description of the Related Art For example, as shown in FIG. 6, an artificial kidney draws blood from a part of a patient 1 to a dialyzer 5 via a discharge pipe 2, a pump 3, and a controller 4, and converts the blood into a dialyzer 5.
A waste pipe is removed from the blood and returned to the body of the patient 1 by utilizing a difference in osmotic pressure between the blood and the dialysate 6 in the inside, and the mixed injection pipe 7 is, for example, a return pipe from the dialyzer 5. 8 and the outlet pipe 2.

In a conventional co-injection tube 7, a rubber plug is hermetically fitted into a branch pipe portion formed on the side of a T-shaped pipe main body, and is inserted through the rubber plug portion. Into the syringe body to inject a drug solution or the like into the syringe body.

[0004]

The conventional mixed injection tube 7 described above.
It is necessary to inject a drug solution or the like using an injection needle, which increases the cost, and furthermore, the used injection needle has a problem in disposal due to adherence contamination of the patient's blood.
There was also a problem of hospital-acquired infection due to such mistaken injection of used needles.

[0005] Therefore, an object of the present invention is to provide a co-infusion tube in which an injection needle is unnecessary and blood leakage and the like can be eliminated.

[0006]

In order to achieve the above-mentioned object, a mixed injection tube according to the present invention comprises a base portion which is airtightly fitted and accommodated in a branch pipe portion on a side of a pipe main body, and a syringe main body or a syringe main body provided on an inner peripheral surface thereof. An injection valve comprising a body having a press-fit portion of a small-diameter tube portion at the tip and a tip having a check valve for sealing with a negative pressure generated in the body by withdrawing the syringe after the injection. Things.

According to the present invention, at the time of injecting a drug solution or the like, the small-diameter tube portion at the tip of the syringe body is press-fitted into the press-fit portion of the inner peripheral surface of the barrel portion of the injection valve to seal the inside of the barrel portion, and in this state the piston of the syringe is pressed. When the drug solution or the like in the syringe body is pushed out from the small-diameter tube portion at the tip, the internal pressure in the body increases, the tip opening of the check valve opens, and the drug solution flows into the blood flowing through the tube body of the mixed injection tube. Etc. can be mixed and injected. After the injection, when the syringe is withdrawn from the inner peripheral surface of the body, a negative pressure is generated in the body, and the negative pressure securely closes the opening at the distal end of the check valve. Leakage can be reliably prevented. Thus, the co-infusion tube of the present invention can eliminate the need for an injection needle and eliminate any backflow of blood.

Further, in the co-infusion tube of the present invention, a second injection valve having a check valve is hermetically mounted in the body of the injection valve, and the check valve is double-equipped. In order to generate pressure, a syringe body or a press-fitting portion of a small-diameter tube portion at the tip thereof is provided on an inner peripheral surface of a body of a second injection valve having an inner check valve. With this configuration, when the syringe is withdrawn from the inner peripheral surface of the body after injection of the drug solution or the like, first, the check valve of the first injection valve is sealed, and then,
By generating a negative pressure in the body of the second injection valve and closing the check valve of the second injection valve, it is possible to prevent blood from flowing back or leaking twice.

Further, in the co-infusion tube of the present invention, the second injection valve having the inner check valve is replaced with the first injection valve having the outer check valve.
The injection valve is slidably housed within the body of the injection valve for a predetermined distance along the press-fitting direction of the syringe main body. With this configuration, when the syringe is withdrawn from the inner peripheral surface of the body after the injection of the drug solution or the like, a negative pressure increased by the sliding distance can be generated in the body of the first injection valve, and this increased The negative pressure first causes the check valve of the first injection valve to be sealed, and then generates a negative pressure in the body of the second injection valve to seal the check valve of the second injection valve. In addition, double backflow and leakage of blood can be prevented, and the blood flow can be further ensured.

In the mixed injection tube according to the present invention, it is preferable that the second injection valve is movably installed in the body of the first injection valve via a diaphragm for a predetermined distance in the direction of press-fitting the syringe body. It is a feature. With this configuration, when the syringe is withdrawn from the inner peripheral surface of the body after the injection of the drug solution or the like, the first
A negative pressure increased by the above-mentioned moving distance of the second injection valve installed through the diaphragm in the body of the injection valve can be generated.
The check valve of the second injection valve is closed, and then the check valve of the second injection valve is closed by generating a negative pressure in the body of the second injection valve to prevent the backflow and leakage of blood. It can be prevented more seriously and can be made more reliable.

In the mixed injection tube according to the present invention, the second injection valve includes a base portion which is airtightly fitted and accommodated in a branch pipe portion on a side portion of the pipe main body, and a syringe main body or a small-diameter distal end thereof on an inner peripheral surface. And a check valve that seals with a negative pressure generated in the body by withdrawal of the syringe after injection, wherein the body is diaphragmed with respect to the base of the second injection valve. A predetermined distance along the press-fit direction of the syringe body in the base portion through
The check valve of the second injection valve is movably installed, and the check valve of the second injection valve is separated, and the peripheral edge of the check valve is sandwiched between the body of the first injection valve and the base of the second injection valve. It is characterized by having made it. With this configuration, at the time of injecting a drug solution or the like, a small-diameter distal end portion of the syringe body is press-fitted into the press-fit portion of the body portion of the second injection valve, thereby pushing down the body portion while stretching the diaphragm, thereby sealing the inside of the body portion. Then, in this state, the inner check valve is opened by pressing the piston of the syringe, and then the outer check valve is opened to inject the drug solution or the like in the syringe body into the co-infusion tube. Can be. After the injection, when the tip small diameter tube portion of the syringe body is withdrawn from the inside of the body of the inner injection valve, the body first rises while stretching the diaphragm upward together with the syringe, whereby the first injection is performed. Negative pressure is generated in the distal end of the valve, the outer check valve is closed, and then the small-diameter tube at the distal end of the syringe body comes out of the body, generating negative pressure in the body and generating a negative pressure inside the body. At the same time, the diaphragm simultaneously closes the inner check valve by elastic action. As described above, according to the fifth embodiment, the double check valve can be sealed first from the outer one, and then the inner one can be sealed sequentially. Therefore, also in the fifth embodiment, the backflow and leakage of the blood flowing in the co-infusion tube can be prevented twice, and the injection needle is not required.

Further, according to the present invention, the injection valve is formed integrally with an elastic material such as rubber. With this configuration, the check valve can be smoothly and smoothly sealed by the negative pressure in the body, and once sealed,
By the original check valve function of the check valve and the sealing and retaining action by the elastic closing force, it is possible to reliably prevent blood from flowing back or leaking.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of a co-infusion tube according to the present invention will be described with reference to the drawings. FIG. 1A is a longitudinal sectional side view showing a first embodiment of a co-infusion tube according to the present invention, and FIG. 1B is a front view of a check valve portion, and the right half thereof is shown in cross section. FIG. 2 is a vertical side view showing a second embodiment according to the present invention, FIG. 3 is a vertical side view showing a third embodiment according to the present invention, and FIG. 4 is a vertical side view showing a fourth embodiment according to the present invention. 5A is a longitudinal sectional side view showing a fifth embodiment according to the present invention, and FIG. 5B is a plan view of a single check valve of the second injection valve.

First, as shown in FIG. 1A, a first embodiment of a co-infusion tube according to the present invention is air-tightly fitted and accommodated in a branch tube portion 12b of a co-infusion tube 12 on the side of a tube main body 12a. Base 1
3a, and a small-diameter tube portion 10a at the tip of the syringe body 10 on the inner peripheral surface.
And a tip 13e having a check valve 13d that seals with a negative pressure generated in the body 13c by withdrawing the syringe after injection, and these parts are made of an elastic material such as rubber. Injection valve 1 integrally formed of material
3 is attached to the branch pipe portion 12b of the co-injection pipe 12 via the lid 14.

The co-infusion tube 12 has pipe insertion ports 12d and 12 at both ends for press-fitting and joining blood circuit pipes (not shown).
The pipe body 12a is formed of a pipe main body 12a and a branch pipe portion 12b formed perpendicular to the side of the pipe main body 12a. Branch pipe portion 12b has a base portion 13a of the injection valve 13 and the base fitting portion 12b ₁ which fits accommodated hermetically barrel 13c of the injection valve 13
A barrel accommodating portion 12b ₂ for housing a and a distal portion accommodating portion 12b ₃ for accommodating the tip end portion 13e of the injection valve 13, and on the front receiving portion 12b _3, communicating communicating with the tube body 12a hole 12b ₄ is is formed.

The base 13a of the injection valve 13 is an annular flange shape out outwardly Zhang, the sealing projection 13a ₁ annular on the outer peripheral surface is Yes formed integrally on the inner peripheral surface, the syringe body 10 13 at the time of insertion of small-diameter tube portion 10a
perform sealing in c, and, upon withdrawal of the front hole pipe portion 10a of the syringe body 10, an annular projection 13a ₂ to prevent curling up of the body portion 13c is are formed integrally.

The barrel portion 13c of the injection valve 13 has a press-fit portion 13b of a small-diameter tube portion 10a at the tip of the syringe body 10 formed on the inner peripheral surface. It is a taper surface similar to the taper of
When injecting a drug solution or the like, the tip small-diameter tube portion 10 of the syringe body 10
When a is inserted into the body portion 13c of the injection valve 13, the airtightness is configured to increase as the insertion depth increases.

The tip portion 13e of the injection valve 13 has a body portion 13c.
And a check valve 13d which is closed by a negative pressure generated in the body 13c by pulling out the syringe after injection. For example, as shown in FIG. 1B, the check valve 13d has an annular upper portion, flattened both side walls toward the tip (lower end), and gradually approached to each other, and brought into close contact with the tip. It is possible to form a so-called duckbill type in which a straight-line cut-shaped tip opening is formed at the contact portion of the tip, but other shapes, for example, as a conical shape, a cross-shaped cut-shaped tip opening may be used. It may be formed.

The lid 14 is formed in a cap shape from the same plastic material as the tube main body 12a and the branch tube portion 12b of the co-infusion tube 12, and has a syringe insertion hole 14a at the center.
Around the periphery, an annular flange portion 14b fitted to the upper end of the branch pipe portion 12b of the co-infusion tube 12 is provided. These mating portion, an annular concave-convex engaging section 14c, the 12b ₅ are formed.

The first embodiment of the present invention has the above-mentioned configuration, and its use will be described as follows. First,
When injecting a drug solution or the like, the tip small-diameter tube portion 10a of the syringe body 10
Into the press-fitting portion 13b on the inner peripheral surface of the body portion 13c of the injection valve 13 to seal the inside of the body portion 13c while slightly extending the upper half portion of the body portion 13c downward. In this state, the piston 11 of the syringe is pressed. When the liquid medicine in the syringe body 10 is pushed out from the small-diameter tube portion 10a at the tip, the internal pressure in the body portion 13c rises, the check valve 13d opens, and the tube body 12a of the co-infusion tube 12 is opened.
The above drug solution can be mixed and injected into blood flowing through the inside. Then, when the tip small diameter pipe portion 10a of the syringe body 10 is pulled out from the inner peripheral surface of the body portion 13c after the injection of the drug solution or the like, the extension of the upper half portion of the body portion 13c is eliminated and the tip portion 13e returns upward. Subsequently, a negative pressure is generated in the body 13c, and the negative pressure causes the check valve 13d to be sealed first. Subsequently, the small-diameter tube portion 10a at the tip of the syringe body 10 is connected to the body 13c.
It will escape from the annular projection 13a ₂ of the press-fit portion 13b and the base 13a. During this time, since the negative pressure is continuously acting inside the body 13c, the check valve 13d is securely sealed. Then, once the check valve 13d is sealed,
Thereafter, the backflow and leakage of the blood flowing through the co-infusion tube 12 can be reliably prevented by the original check valve action of the check valve and the hermetic sealing action by the elastic closing force.

As shown in FIG. 2, the second embodiment of the mixed injection tube according to the present invention comprises a second injection valve 15 having a check valve 15d in the body 13c of the injection valve 13 of the first embodiment. The check valve 13d, 15d is double-equipped by airtightly mounting, and the press-fit portion 15b of the small-diameter tube portion 10a at the distal end of the syringe body 10 is provided on the inner peripheral surface of the body 15c of the inner check valve 15d. It is a thing. The injection valves 13 and 15 of the second embodiment shown in FIG. 2 have a configuration in which the injection valves 13 and 15 of the first embodiment are doubled as they are, and the same parts as those of the first embodiment are denoted by the same subscripts. Detailed description is omitted.

According to the configuration of the second embodiment, the small-diameter tube portion 10a of the syringe body 10 is directly connected to the inner injection valve 15a.
By press-fitting into the press-fitting portion 15b in the body 15c of
The inside of the body 15c is sealed while the upper half of the body 15c is slightly stretched downward, and in this state, the inner check valve 15d is opened by pressing the piston of the syringe,
Subsequently, by opening the outer check valve 13d, the medical solution or the like in the syringe body 10 can be injected into the co-infusion tube 12,
After the injection, when the tip small-diameter tube portion 10a of the syringe body 10 is pulled out from the press-fitting portion 15b in the body portion 15c of the inner injection valve 15, the extension of the upper half of the body portion 15c is eliminated and the inner injection valve 15a is removed. Is returned upward, thereby generating a negative pressure in the distal end portion 13e of the outer injection valve 13 and sealing the outer check valve 13d. by part 10a is gradually exits the projection 15a ₂ of the annular body portion 15c and the base 15a, the body portion 15
A negative pressure is generated in c to seal the inner check valve 15d. Thus, according to the second embodiment, the double check valve 1
3d, 15d are sealed first from the outer one,
The inner ones can be sealed in turn. Therefore,
In the second embodiment, the backflow and leakage of the blood flowing in the co-infusion tube 12 can be prevented twice, and the injection needle is not required.

As shown in FIG. 3, the third embodiment of the co-infusion tube according to the present invention is such that the barrel 15c of the inner second injection valve 15 is inserted into the barrel 13c of the outer first injection valve 13. The main body 10 is housed so as to be slidable by a predetermined distance s along the press-fit direction. In the third embodiment, the second injection valve 1
5 is eliminated, the body 15c is made thicker like a piston, and the press-fitting portion 15b is formed in the inner peripheral surface of the body 15c in a tapered shape similar to the above, and the check valve 15d has a downward arc shape. And a straight or cross-shaped opening at the center of the lower end. And the base 1 of the outer first injection valve 13
On the inner peripheral surface of 3a, an annular stopper portion 13f for preventing the inner second injection valve 15 from coming off is formed.

According to the structure of the third embodiment, after the injection of the drug solution or the like, the small-diameter tube portion 10a at the distal end of the syringe body 10 is connected to the body portion 1.
When the piston-shaped body 15c is pulled out from the press-fitting portion 15b on the inner peripheral surface of the syringe 5c, the piston-like body 15c rises by the sliding distance s together with the small-diameter tube portion 10a at the tip of the syringe main body 10, and moves by this piston The increased negative pressure is applied to the body 13 of the first injection valve 13.
c, and the increased negative pressure causes the outer check valve 13d to be sealed first, and then the tip small diameter tube portion 10a of the syringe body 10 is connected to the body portion 15c of the inner injection valve 15. As a result, a negative pressure is generated in the body portion 15c of the inner injection valve 15, and the inner check valve 15d is hermetically closed by the negative pressure.
As a result, backflow and leakage of blood flowing through the co-infusion tube 12 can be more reliably prevented.

As shown in FIG. 4, the fourth embodiment of the co-infusion tube according to the present invention employs the outer first injection port to make the movement of the body 15c of the inner second injection valve 15 smoother. The syringe body 1 is inserted into the body 13c of the valve 13 via the diaphragm 15g.
It is installed so as to be movable by a predetermined distance along the zero press-fit direction. In the fourth embodiment, the base 15a and the body 15c of the second injection valve 15 are connected to a diaphragm 15g.
The press-fit portion 1 is attached to the inner peripheral surface of the body portion 15c.
5b is formed in a tapered shape similar to that described above, and the check valve 15d is formed as a flat film portion inside and above the lower end of the body portion 15c. It has a tip opening. The base 13a of the outer first injection valve 13 is omitted, and the base 15a of the inner second injection valve 15 is provided at the upper end of the body 13c.
Is placed on the lower end.

According to the fourth embodiment, the syringe body 10
The small-diameter tube portion 10a is connected to the body portion 15c of the inner injection valve 15.
Is press-fitted into the press-fitting portion 15b, the inside of the body 15c and the inside of the body 13c of the injection valve 13 on the outside are also sealed, and the syringe body 10
When the tip small diameter pipe portion 10a is further pushed in, the body portion 15c
Moves downward by a predetermined distance while pulling the diaphragm 15g downward, and hits the lower end of the body portion 13c of the first injection valve 13, whereby the tip small-diameter tube portion 10a of the syringe body 10 is moved.
Is deeply pressed into the body 15c. In this state, if the syringe piston 11 is pressed to push out the medicinal solution or the like in the syringe body 10, the inner check valve 15d is opened, the outer check valve 13d is opened, and the co-infusion tube 12 is opened. After the injection, the small-diameter tube portion 10 of the distal end of the syringe body 10 can be injected.
a is pulled out from the press-fitting portion 15b inside the body portion 15c of the inner injection valve 15, while the body portion 15c of the inner injection valve 15 pulls the diaphragm 15g upward, the upper end thereof is the lid 1
4 together with the small-diameter tube portion 10a at the tip of the syringe body 10, whereby a negative pressure is generated in the body 13c of the outer first injection valve 13 and the outer check valve 13d is Seal tightly. Subsequently, the small-diameter tube portion 1 at the tip of the syringe body 10
0a is pulled from the inner trunk portion 15c to the tip small-diameter tube portion 10
a is pulled out, whereby a negative pressure is generated in the inner body 15c, and the inner check valve 15d is closed. As a result, backflow and leakage of blood flowing through the co-infusion tube 12 can be more reliably prevented. In the fourth embodiment shown in FIG. 4, a stopper (not shown) may be provided to protrude downward from the inner peripheral lower surface of the lid 14 so as to restrict the inner trunk 15c from rising more than necessary. .

In the fifth embodiment of the co-infusion tube according to the present invention, as shown in FIG.
a body 15c having a press-fit portion 15b of the syringe body 10 or its small-diameter tube portion 10a on the inner peripheral surface, and a syringe after injection; And a check valve 16 which is hermetically closed by a negative pressure generated in the body portion 15c by pulling out the second injection valve 1.
5 with respect to the base 15a and the body 15c with the diaphragm 15
g so as to be movable by a predetermined distance along the press-fitting direction of the syringe body 10 in the base portion 15a through the base 15a, and
The check valve 16 of the injection valve 15 of this
Of the first injection valve 13 with the body 13c of the first injection valve 13.
And the base 15a of the injection valve 15 of FIG.
The check valve 16 of the second injection valve 15 is shown in FIGS.
As shown in the figure, the central valve leaf part 16a which has been raised conically
And an annular peripheral portion 16c connected from the central valve leaf portion 16a via a plurality of ribs 16b. The central valve leaf portion 16a is elastically restored from the lower end of the body portion 15c into the body portion 15c. It is pushed in by force, closes by contacting the inner peripheral surface of the lower end of the body 15c, and prevents blood from flowing back into the body 15c of the second infusion valve 15 from this portion. In order to ensure the closing action of the central valve leaf part 16a, in a no-load state, the lower end of the body part 15c lowers the central valve leaf part 16a slightly downward to give a preload, and a check valve by elastic repulsion. 16 is improved.
The opening and closing action of the central valve leaflet 16a depends on the thickness of the rib 16b,
The width, length, and the like are set appropriately so as to operate smoothly. In order to prevent the distal opening of the distal small-diameter tube portion 10a of the syringe body 10 from being closed by the conical distal portion of the central valve leaf portion 16a, a plurality of ridges 16d are conical distal portions of the central valve leaf portion 15a. Are formed radially around.

According to the fifth embodiment, when injecting a drug solution or the like, the small-diameter tube portion 10a at the distal end of the syringe body 10 is press-fitted into the press-fit portion 15b of the body portion 15c of the second injection valve 15, thereby forming the diaphragm 15g. 15c while stretching
Is pressed down to seal the inside of the body 15c, and in this state, the central valve membrane portion 16a of the inner check valve 16 is pressed down to open by pressing the piston of the syringe, and then the outer valve is opened. By opening the check valve 13d, the drug solution or the like in the syringe body 10 can be injected into the co-infusion tube 12. After the injection, when the tip small diameter pipe portion 10a of the syringe body 10 is withdrawn from the inside of the body portion 15c of the inner injection valve 15, the body portion 15c rises while stretching the diaphragm 15g upward together with the syringe, and thereby, Through the window hole 16e between the ribs 16b of the stop valve 16, first, a negative pressure is generated in the distal end portion 13e of the first injection valve 13 to seal the outer check valve 13d. As the small-diameter tube portion 10a of the end portion of the inner portion of the non-return valve 16a comes out of the body portion 15c, a negative pressure is generated in the body portion 15c and the inner check valve 16a.
The central valve film portion 16a is brought into close contact with the inner peripheral surface of the lower end of the body portion 15c, and the second check valve 16 is closed. Thus, the fifth
According to the embodiment, the double check valves 13d and 16 can be sealed first with the outer ones and then with the inner ones in order. Therefore, also in the fifth embodiment,
Backflow and leakage of blood flowing in the co-infusion tube 12 can be prevented twice, and an injection needle is not required. In the fifth embodiment shown in FIG. 5, a stopper (not shown) is provided on the inner peripheral lower surface of the lid 14 so as to protrude downward to form an inner trunk portion 15c.
May be regulated so that it does not rise more than necessary.

Although the embodiment of the co-infusion tube of the present invention is as described above, the specific shape of the check valve is not limited to the illustrated example, and may be a configuration in which a negative pressure is generated at the time of withdrawing the syringe to seal the syringe. If necessary, it may be changed and implemented.

[0030]

According to the first aspect of the present invention, it is not necessary to use an injection needle when injecting a drug solution or the like, and the drug solution or the like in the syringe body is accurately mixed with blood flowing in the tube body of the co-infusion tube. Can be injected. Then, after injection, backflow and leakage of blood can be reliably prevented.

According to the second aspect of the present invention, backflow and leakage of blood can be prevented twice.

According to the third, fourth and fifth aspects of the present invention, backflow and leakage of blood can be more reliably prevented.

According to the sixth aspect of the present invention, the check valve can be softly and smoothly sealed by the negative pressure in the body portion. By the action and the sealing and holding action by the elastic closing force, backflow and leakage of blood can be reliably prevented.

[Brief description of the drawings]

1 (A) is a longitudinal sectional side view showing a first embodiment of a co-infusion tube according to the present invention, and FIG. 1 (B) is a front view of a duckbill check valve portion, and the right half thereof is shown in cross section.

FIG. 2 is a longitudinal sectional side view showing a second embodiment according to the present invention.

FIG. 3 is a vertical sectional side view showing a third embodiment according to the present invention.

FIG. 4 is a longitudinal sectional side view showing a fourth embodiment according to the present invention.

FIG. 5 (A) is a vertical side view showing a fifth embodiment according to the present invention, and FIG. 5 (B) is a plan view of a single check valve of a second injection valve.

FIG. 6 is an explanatory diagram of a blood circuit of the artificial kidney.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Patient 2 Derivation circuit 3 Pump 4 Controller 5 Dialyser 6 Dialysate 7 Conventional co-infusion tube 8 Return circuit 10 Injector main body 10a Small-diameter tube portion at the tip 11 Syringe piston 12 Co-infusion tube 12a Tube main body 12b Branch tube portion 13 Injection valve 13a 13b Press-in portion 13c Body 13d Check valve 13e Tip 13f Stopper 14 Cover 15 Second injection valve 15a Base 15b Press-in portion 15c Body 15d Inner check valve 15e Tip 15g Diaphragm 16 Check valve

Continuing from the front page (72) Inventor Kihito Okui 1-21-4 Nishijuku, Minoh-shi, Osaka Inside Fukai Industry Co., Ltd. (72) Inventor Yoshitaka Yasuda 2-33-35 Kizaki, Urawa-shi, Saitama Sejuur 1-101 F-term (reference) 4C066 AA07 BB02 CC01 LL07 LL08

Claims (6)

[Claims] 1. A base which is airtightly fitted and accommodated in a branch pipe part on a side of a pipe main body, a barrel having a press-fitting part of a syringe main body or a small-diameter pipe part at an inner peripheral surface thereof, and a syringe after injection. And a tip having a check valve that seals against a negative pressure generated in the body by the withdrawal of the injection pipe. 2. A second injection valve having a check valve in the body of the injection valve is hermetically mounted, and a double check valve is provided.
2. A syringe body or a press-fit portion of a small-diameter tube portion at the tip thereof is provided on an inner peripheral surface of a body portion of an inner second injection valve to generate a negative pressure when the syringe is withdrawn. Mixed injection tube. 3. The second injection valve having the inner check valve is slidable in the barrel of the first injection valve having the outer check valve by a predetermined distance along the direction of press-fitting the syringe body. The mixed injection tube according to claim 2, wherein the mixed injection tube is housed. 4. The apparatus according to claim 2, wherein the second injection valve is movably installed in the body of the first injection valve via the diaphragm for a predetermined distance in the direction of press-fitting the syringe body. Co-infusion tube as described. 5. The second injection valve has a base portion which is airtightly fitted and accommodated in a branch pipe portion on a side portion of the pipe main body, and a press-fit portion of a syringe main body or a small-diameter pipe portion at the tip thereof on an inner peripheral surface. A torso,
A check valve that seals with a negative pressure generated in the body by pulling out the syringe after the injection, and the body of the syringe body in the base with respect to the base of the second injection valve via the diaphragm. The check valve of the second injection valve is provided separately from the first injection valve, and the peripheral portion of the check valve is separated from the body of the first injection valve by the second injection valve. 3. The co-infusion tube according to claim 2, wherein the co-infusion tube is sandwiched between the base of the injection valve and the base. 6. The co-infusion tube according to claim 1, wherein said injection valve is formed of an elastic material such as rubber.