JPH023625B2 - - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balloon catheter used as a vascular catheter, a urinary catheter, or the like.

PRIOR ART In general, balloon catheters (1) use the blood flow pressure acting on the balloon inflated within the blood vessel to feed the distal end of the catheter body equipped with the balloon from the right ventricle of the heart into the pulmonary artery; measuring wedge pressure; (2) by a balloon inflated at the narrowed or constricted portion of the blood vessel;
(3) Increase coronary blood flow through the pumping action of a balloon that repeatedly inflates and deflates near the left ventricle of the aorta in approximately synchronization with the heart; (4) Inflates within the blood vessel. By moving the balloon inside the blood vessel, the blood clot adhering to the inner surface of the blood vessel is removed. It is used for things such as being kept inside the body.

The balloon catheter is provided with a balloon on the outer periphery of the distal end of the catheter body, and has a sub passage communicating with the internal space of the balloon extending from the proximal end side of the catheter body to the distal end side, and is used for inflation of the balloon using a syringe. Liquid can be injected into the internal space of the balloon from the proximal opening of the sub-passage. That is, when the balloon catheter is inserted into a blood vessel and then inflated within the blood vessel, the balloon catheter is filled with physiological saline, It can be inflated with a balloon inflation liquid that is harmless to the human body, such as glucose solution.

However, in conventional balloon catheters, the inside of the balloon inflated by the balloon inflation liquid is not completely exhausted to the outside.
To avoid the risk of air remaining in the balloon entering the bloodstream when the balloon ruptures, inflate the balloon several times with carbon dioxide gas before injecting the balloon inflation liquid into the balloon. There is also a method in which the balloon is inflated by replacing the air and carbon dioxide gas present in the sub-passage and then injecting a balloon inflation liquid into the balloon. In other words, according to the gas replacement operation described above, the gas remaining in the balloon will be carbon dioxide gas, and even if the balloon ruptures, carbon dioxide gas will dissolve into the blood, so this will prevent danger. becomes possible. However, in this case, a complicated operation of replacing air with carbon dioxide gas is required.

OBJECTS OF THE INVENTION The present invention provides a balloon catheter that allows air in the balloon and auxiliary passages to be easily discharged to the outside when an inflation liquid is injected into the balloon, and that allows the balloon to be inflated only with the inflation liquid. The purpose is to provide.

Configuration of the Invention In order to achieve the above object, the first aspect of the present invention is to:
In a balloon catheter having a balloon on the outer periphery of a distal end of a catheter body having a main passage, a liquid for balloon inflation is injected into the catheter body, extending from the proximal end to the distal end of the catheter body and communicating with the internal air of the balloon. and a sub-passage for exhausting the air inside the balloon and the sub-passage, and a syringe for a balloon inflation liquid can be attached to the proximal opening of the injection sub-passage in a liquid-tight manner, A valve body is provided that opens when the syringe is attached and closes when the syringe is not attached, and the proximal end of the sub-passage for exhaust is a closed end that allows communication between the sub-passage and the outside.

Moreover, the first aspect of the present invention is that the proximal closed end of the secondary exhaust passage is made of a member into which an injection needle can be inserted.

Moreover, the first aspect of the present invention is that the proximal closed end of the sub-exhaust passage is made of an air-permeable and liquid-impermeable member.

A second aspect of the present invention is a balloon catheter having a balloon on the outer periphery of a distal end of a catheter body having a main passage, the balloon extending from the proximal end side to the distal end side of the catheter body and communicating with the internal space of the balloon. A auxiliary passage for injecting a balloon inflation liquid and a auxiliary passage for exhausting the air inside the balloon and the auxiliary passage are provided, which communicate with each other, and a syringe for the balloon inflation liquid is placed in a liquid-tight manner at the proximal opening of the auxiliary injection passage. a valve body that can be attached in a state in which the syringe is attached, opens when the syringe is attached, and closes when the syringe is not attached;
The proximal opening of the sub-passage for exhaust is provided with opening/closing means that can freely open and close the opening.

In a second aspect of the present invention, the opening/closing means is a two-way stopcock.

A second aspect of the present invention is that the opening/closing means is a valve body that allows the thin tube to be inserted in a liquid-tight state and closes when the thin tube is not inserted.

A second aspect of the present invention is that at least one of the valve bodies includes a first notch that opens only on one end surface thereof and a second notch that opens only on the other end surface, and The cut and the second cut intersect inside the cut.

In a second aspect of the present invention, the valve body is made of a soft and elastic material.

In a second aspect of the present invention, the first notch of the valve body is composed of a plurality of mutually intersecting notches, the second notch is composed of a plurality of mutually intersecting notches, and the first notch is composed of a plurality of mutually intersecting notches. Notch and second
The notches intersect at a single position inside the valve body.

Moreover, the second aspect of the present invention is that the end surface of the valve body is formed into a convex shape.

DETAILED DESCRIPTION OF THE INVENTION FIG. 1 is a cross-sectional view showing a balloon catheter 10 according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view showing a main part thereof.

The main body 11 of the balloon catheter 10 includes a flexible straight part 11A, and a first branch part 11B and a second branch part formed from two opposing positions in the diametrical direction of the proximal outer circumference of the straight part 11A. It consists of 11C. Straight part 1 of main body 11
1A has a main passage 12 that penetrates from the proximal side to the distal side of the straight part 11A, and the main passage 12 allows the insertion of a guide wire that allows the balloon catheter 10 to be introduced into the blood vessel, and also allows the passage of a drug. etc. can be distributed. Note that the main hub 13 is attached to the base end of the straight portion 11A.

A balloon 14 made of an elastic material that can be expanded from a contracted state is provided on the outer circumferential portion of the straight portion 11A of the main body 11.

Straight portion 11A of main body 11 and first branch portion 11
In B, an injection sub-path 15 is formed which communicates with the internal space of the balloon 14 from the proximal end side of the first branch portion 11B via a communication port 15A. A sub-hub 16 is connected to the first branch portion 11B, and the sub-hub 16
A balloon inflation liquid syringe 1 is inserted into the proximal opening of the balloon inflation liquid syringe 1.
A valve body 18 is held by a cap 19, and is closed when the syringe 17 is not inserted. Note that a passage 19A is formed in the cap 19.

Further, an exhaust sub-passage 20 is formed in the straight portion 11A and the second branch portion 11C of the main body 11, which communicates from the proximal end side of the second branch portion 11C to the internal space of the balloon 14 via the communication port 20A. There is. Second
The proximal end of the branch portion 11C is a closed end 21 that allows communication between the sub-passage for exhaust 20 and the outside. This closed end 21 is made of a material that can be pierced with an injection needle.

Here, as shown in FIGS. 3A to 3C, the valve body 18 has a first notch 25 that opens only on one end surface and a second notch 26 that opens only on the other end surface. , the first notch 25 and the second notch 26 intersect inside the valve body 18. That is, the first notch 25 and the second notch 26 form an intersection 27 with a distance L, so that the syringe 17
It is possible to pass through each of the notches 25 and 26 and their intersection 27 under elastic deformation of 8.

FIG. 4 is an explanatory diagram showing the deformation direction of each notch 25, 26 when inserting the syringe 17 into the valve body 18, and FIG.
7. FIG. 7 is an explanatory diagram showing the opening shape of each cut 25 and 26 when the exhaust pipe 22 is inserted. The valve body 18 is divided into three characteristic parts in its axial direction, that is, a part where only the first notch 25 exists;
The part where the intersection 27 exists, the second cut 26
If you slice it into three parts, the part where only
3 of 18A to 18C as shown in 1 of Figure 4
become a part. If the valve body 18 is simply made up of three separate parts as shown in 18A to 18C above, the direction of deformation of each cut 25, 26 when inserting the syringe 17 is The state shown by arrow 2 in FIG. 4 is reached, and the opening shape of each cut 25, 26 after insertion becomes the state shown by 1 in FIG. 5. However, valve body 1
8 is an integral part of the main body, each slice part is influenced by other parts adjacent to it, and the syringe 1
Each cut 2 when trying to insert 7
The deformation direction of the notches 5 and 26 changes continuously in the axial direction inside the valve body 18, as shown by the arrow 3 in FIG. The state shown by 2 in Fig. 5 is reached. That is, the syringe 1 inserted into the valve body 18
The circumference of 7 is continuous in the axial direction by each of the notches 25 and 26, regardless of whether the outer diameter is relatively small or large. Being held down.

Here, the valve body 18 is made of synthetic rubber such as silicone rubber, urethane rubber, or fluorine rubber, or natural rubber or other flexible elastic material. Therefore, each notch 25, 26 of the valve body 18 is
The syringe 17 and the valve body 18 are in close surface contact with the outer periphery of the syringe 17 to maintain a reliable liquid-tight state. Note that the distance L formed by the intersection 27 of the notches 25 and 26 of the valve body 18 is determined according to the maximum outer diameter of the syringe 17 inserted into the valve body 18.

In a vascular balloon catheter, the catheter body is made of polyurethane, polyethylene, etc., and the balloon is made of polyvinyl chloride or silicone rubber.

In the above, the case where the balloon catheter of the present invention is used for blood vessels has been explained as an example. When the balloon catheter of the present invention is used as a urethral balloon catheter, the distal end of the catheter body has a hemispherical closed end, and the side wall of the distal end has a side hole that communicates the main passage of the catheter body with the outside. The catheter is the same as the above-mentioned vascular balloon catheter except for the following points.

Further, in a balloon catheter for the urethra, latex rubber, silicone rubber, polyvinyl chloride, etc. are used for the catheter body, and latex rubber, silicone rubber, etc. are used for the balloon.

Specific Effects of the Invention First, before using the balloon catheter 10, a hollow needle with an inner needle inserted therein is introduced into a blood vessel through the skin, and then a guide wire is inserted into the hollow needle from which the inner needle is removed. The hollow needle is then removed, leaving the guidewire. Next, the introducer set is placed in the blood vessel using the guide wire. Next, the balloon catheter 10 is introduced into the blood vessel through the introducer, and the deflated balloon 14 is guided to a predetermined position within the blood vessel where it is to be inflated.

Next, insert the injection needle into the closed end 21 of the second branch 11C.
, and its tip is positioned within the sub-passage for exhaust 20 . Next, a syringe 17 capable of injecting a balloon inflation liquid such as physiological saline is inserted into the passage 19A of the cap 19, each notch 25 of the valve body 18,
26 and inject the inflation liquid into the injection sub-path 15, the internal space of the balloon 14, and the exhaust sub-path 20 using the syringe 17. When injecting this inflation liquid, each sub passage 15, 20 and the balloon 1
The air present in the internal space of 4 is discharged to the outside through the injection needle. When injecting the inflation liquid into the sub passages 15, 20 and the internal space of the balloon 14, the notches 25, 26 of the valve body 18 are brought into close contact with the periphery of the syringe 17 without any gaps;
Maintains liquid tightness and prevents leakage of inflation liquid.

Following the evacuation of air from the injection needle, the inflation liquid is ejected from the injection needle, thereby completing the evacuation of the air present in each of the sub passages 15, 20 and the internal space of the balloon 14. After confirmation, the injection needle is removed from the closed end 21. After this, the inflation liquid is continuously injected by the syringe 17,
After the balloon 14 is inflated to a predetermined inflation state using only the inflation liquid, the syringe 17 is also removed from the valve body 18, and the balloon 14 in the inflated state returns to the predetermined inflation state as described above. work is done. When the syringe 17 is removed in this way, the syringe 17 is removed from each notch 2 of the valve body 18.
At the same time as it is pulled out from 5 and 26, each cut 2
5 and 26 form a completely closed state, preventing the inflation liquid from flowing out and stably maintaining the predetermined inflation state of the balloon 14. Here, since each of the notches 25 and 26 of the valve body 18 is opened only on one end surface of the valve body 18, the restoring force to the closed state is strong when the syringe 17 is removed, and There is no reverse opening operation on the end face side. In addition, the valve body 18 from which the syringe 17 has been removed has each notch 2
5 and 26 do not open to the other end face, the pressure resistance against the pressure of the inflation liquid acting on the end face of the valve body 18 is high, and stable closure is achieved without being deformed by the pressure of the inflation liquid. maintain the condition.

In addition, each notch 25, 26 of the valve body 18
Whether the syringe 17 to be inserted has a relatively small outer diameter or a relatively large outer diameter, the syringe 17 is in close contact with the periphery of the syringe 17 without any gaps. Therefore, it is possible to fit each of the syringes 17 having different outer diameters in a liquid-tight manner.

FIGS. 6A and 6B are explanatory diagrams showing a first modification of the valve body 18. In this valve body 30,
Cut 3 where the first cuts 31 intersect with each other
1A and 31B, and the second notch 32 is
It consists of cuts 32A and 32B that intersect with each other, and the first cut 31 and the second cut 32 intersect at a single position inside the valve body 30. According to this valve body 30, each notch 3
Under conditions in which the lengths of 1 and 32 are made relatively short, it is possible to increase the deformability of each notch 31 and 32, and it is possible to increase the deformability of each notch 31 and 32. It is also possible to insert the

FIGS. 7A and 7B are explanatory diagrams showing a second modification of the valve body 18. This valve body 40 has a first notch 41 and a second notch 42, and each end face 43, 44 is convex. Therefore, according to this valve body 40, the pressure of the balloon inflation liquid acting on the end face of the valve body 40 is directed toward the center of the valve body 40, and the closed state of the valve body 40 and the liquid against the syringe are It becomes possible to form a dense state more reliably.

FIG. 8 is an explanatory diagram showing a third modification of the valve body 18. In this third modification, the first
A secondary hub 16 similar to that in the embodiment according to the figures,
A pair of first valve body 51 and second valve body 52 as shown in FIG. 9 are held by a cap 19. The first valve body 51 has a circular opening 51A in its center and can prevent the balloon inflation liquid from flowing out when a syringe is inserted, and the second valve body 52 has a circular opening 51A in its center. 52A, making it possible to prevent the inflation liquid from flowing out without inserting the syringe. Therefore, such a first valve body 51
Also when a set of valve bodies including the second valve body 52 is used, it is possible to reliably prevent the inflation liquid from flowing out from the proximal opening of the sub passage 15 in the embodiment described above.

FIG. 10 is an explanatory diagram showing a fourth modification of the valve body 18. In this fourth modification, an elastic body 61 and an elastic body 6 are provided inside a sub-hub 16A which is substantially the same as the sub-hub 16 in the embodiment according to FIG.
A valve body 63 that can be pressed against a valve seat 62 formed in the sub-hub 16A by the valve body 63 is built in.
That is, when inserting the syringe 17, if the tip of the syringe 17 is inserted until it comes into contact with the stopper 64 formed in the opening of the sub-hub 16A, the valve body 63
resists the biasing force of the elastic body 61 and separates from the valve seat 62, allowing communication between the inside of the sub-hub 16A and the injector 17 via a circulation groove 65 carved in the tip of the valve body 63. do. Therefore, such a valve body 63
Even in the case of using the auxiliary passage 15, it is possible to reliably prevent the inflation liquid from flowing out from the proximal opening of the sub passage 15.

FIG. 11 shows a modification of the closed end 21 in the second branch 11C, in which a sub-hub 71 is connected to the base end of the second branch 11C, and the sub-hub 71 has air permeability maintained by a cap 72. In addition, a filter 73 that is impermeable to liquid is provided. Filter 7
3 is formed of, for example, a laminate of porous Teflon and polypropylene nonwoven fabric, and allows the air present in each of the sub passages 15, 20 and the internal space of the balloon 14 to be discharged.

In addition, the said Example demonstrated the case where the base end of the sub-passage for exhaust 20 is made into the closed end which allows the sub-passage 20 and the exterior to communicate. however,
In the present invention, an opening/closing means as described below may be provided at the base end opening of the sub-passage for exhaust 20.

That is, FIGS. 12A and 12B show the second branch portion 11 forming the sub-exhaust passage 20 in FIG.
A two-way stopcock 81 is provided at the proximal opening of C to open and close the passage. Figure 12A shows passage 8
2 and passage 83 are shown closed by rotor 84, and FIG. 12B shows passage 82 and passage 83 communicated by passage 85 of rotor 84. First, the two-way stopcock 81 is opened as shown in FIG. 12B. Next, as in the embodiment shown in FIG. 1, a syringe 17 capable of injecting a balloon inflation liquid such as physiological saline is inserted into the passage 19A of the cap 19 and the notches 25 and 26 of the valve body 18. Then, the syringe 17 supplies the inflation liquid to the sub-injection passage 15 and the balloon 1.
4 and the sub-passage for exhaust 20. When injecting this inflation liquid, each passage 15, 20
The air existing in the internal space of the balloon 14 is discharged via the two-way stopcock 81. Following the discharge of air from the two-way stopcock 81, the inflation liquid is discharged from the two-way stopcock 81, thereby causing each passage 15, 2
After confirming that the air present in the inner space of the balloon 14 and the inner space of the balloon 14 has been completely discharged, the two-way stopcock 81 is closed.
The passage is closed as shown in FIG. 12A. After this, the inflation liquid is continuously injected by the syringe 17, and after the balloon 14 is inflated to a predetermined inflation state only by the inflation liquid, the syringe 17 is also removed from the valve body 18,
A predetermined operation is performed by the balloon 14 in the inflated state.

Note that the two-way stopcock 81 is used as the opening/closing means provided at the proximal opening of the secondary exhaust passage 20 as described above.
However, the present invention is not limited to this, and a valve body may be used that allows the exhaust thin tube to be inserted in a liquid-tight state and closes when the thin tube is not inserted. As this valve body, one having the same structure as the valve body 18 in the embodiment described above is used.

Furthermore, in the case of a urethral balloon catheter, the balloon catheter is directly inserted into the urethra. However, if the insertion resistance is large due to the outer diameter, a core bar is inserted into the main passage of the balloon catheter, and the balloon catheter is inserted together with the core bar into the urethra.

Specific Effects of the Invention As described above, the first aspect of the present invention is a balloon catheter having a balloon on the outer periphery of the distal end of a catheter body having a main passage. A sub-passage for injecting a liquid for balloon inflation, which extends and communicates with the internal space of the balloon, and a sub-passage for exhausting air within the balloon and the sub-passage are provided, and the balloon is disposed at the proximal opening of the sub-injection passage. A syringe for inflation liquid can be attached in a liquid-tight manner,
A valve body is provided that opens when the syringe is attached and closes when the syringe is not attached, and the proximal end of the sub-passage for exhaust is a closed end that allows communication between the sub-passage and the outside. Therefore, when the inflation liquid is injected into the balloon, the air in the balloon and the sub passage can be easily discharged to the outside, and the balloon can be inflated only by the inflation liquid.

Moreover, the first aspect of the present invention is that the closed end of the proximal end of the sub-exhaust passage is made of a member capable of being pierced with an injection needle, thereby making it possible to simplify the structure.

Moreover, the first aspect of the present invention is that the proximal closed end of the secondary exhaust passage is made of a breathable and liquid-impermeable member, thereby eliminating the need for an exhaust means such as a syringe needle.

A second aspect of the present invention is a balloon catheter having a balloon on the outer periphery of a distal end of a catheter body having a main passage, the balloon extending from the proximal end to the distal end of the catheter main body, and
A sub-pathway for injecting a liquid for balloon inflation and a sub-pathway for exhausting the air inside the balloon and the sub-pathway are provided, each communicating with the internal space of the balloon, and a liquid for balloon inflation is provided at the proximal opening of the sub-pathway for injection. A syringe can be attached in a liquid-tight state, and a valve body is provided that opens when the syringe is attached and closes when the syringe is not attached; It has an opening/closing means that can be opened and closed. Therefore, when the inflation liquid is injected into the balloon, the air in the balloon and the sub passage can be easily discharged to the outside, and the balloon can be inflated only by the inflation liquid.

Moreover, the second aspect of the present invention is that the opening/closing means is a two-way stopcock, thereby making it possible to simplify the structure.

A second aspect of the present invention is that the opening/closing means is a valve body that allows the thin tube to be inserted in a liquid-tight state and closes when the thin tube is not inserted.

A second aspect of the present invention is that at least one of the valve bodies includes a first notch that opens only on one end surface thereof and a second notch that opens only on the other end surface, and Since the notch and the second notch intersect inside the notch, syringes or evacuation tubes with a wide variety of outside diameters can be inserted into the valve body in a fluid-tight manner, and the leakage of the inflation liquid can be ensured. To prevent the expansion liquid from flowing out when a syringe or exhaust capillary is suddenly pulled out of the valve body, and to simplify the structure by providing a single valve body. becomes possible.

Further, the second aspect of the present invention is that the valve body is made of a flexible and elastic material, so that the notch of the valve body is in close surface contact with the outer circumference of the injector or the exhaust pipe, and each valve body and the injection It becomes possible to ensure a liquid-tight state with the container or exhaust tube.

Further, the second aspect of the present invention is that the first notch of the valve body is made up of a plurality of cuts that intersect with each other, and the second notch is made of a plurality of cuts that intersect with each other, By intersecting the first notch and the second notch at a single position inside the valve body, the deformability of each notch is increased while the length of each notch is relatively shortened. This makes it possible to insert and hold even a syringe or exhaust tube with a relatively large outer diameter into a relatively small valve body.

The second aspect of the present invention is to direct the pressure of the balloon inflation liquid acting on the end surface of the valve body toward the center of the valve body by making the end surface of the valve body convex.
It becomes possible to more reliably create a closed state of the valve body and a liquid-tight state with respect to the syringe or the exhaust tube.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing a balloon catheter according to an embodiment of the present invention, FIG. 2 is a cross-sectional view showing the main parts of FIG. 1, and FIG. 3A is a cross-sectional view showing the valve body in FIG. 1. FIG. 3B is a plan view showing the same valve body, FIG. 3C is a side view showing the same valve body, and FIG.
The figure is an explanatory diagram showing the deformation direction of each notch provided in the same valve body, FIG. 5 is an explanatory diagram showing the frontage shape of each notch provided in the same valve body, and FIG. A plan view showing the first modification, FIG. 6B is the sixth
FIG. 7A is a side view of the valve body according to the present invention, FIG. 7B is a side view of FIG. 7A, and FIG. 8 is a side view of the valve body according to the present invention. 9 is a perspective view showing the valve body of FIG. 8 taken out, FIG. 10 is a sectional view showing a fourth modification of the valve body of the present invention, and FIG. 11 is a cross-sectional view of the valve body of the present invention. 12A and 12B are explanatory diagrams showing an example of the opening/closing means of the present invention. 10... Balloon catheter, 11... Main body,
12... Main passage, 14... Balloon, 15... Sub-injection passage, 17... Syringe, 18, 23, 3
0, 40, 51, 52, 63... Valve body, 20...
Exhaust sub passage, 22... Exhaust pipe, 25, 31, 4
1... First cut, 26, 32, 42... Second cut, 27... Intersection, 31A, 31
B, 32A, 32B...notch, 43, 44...
...End face, 73...Filter, 81...Two-way stopcock.

Claims (1)

[Scope of Claims] 1. A balloon catheter having a balloon on the outer periphery of a distal end of a catheter body having a main passage, the catheter body having a balloon extending from the proximal end to the distal end of the catheter body and communicating with the internal space of the balloon, respectively. A auxiliary passageway for injecting a balloon inflation liquid and a auxiliary passageway for exhausting the air inside the balloon and the auxiliary passageway are provided, and a syringe for the balloon inflation liquid is placed in a liquid-tight state at the proximal opening of the auxiliary injection passageway. A valve body is provided that can be attached to the syringe and is open when the syringe is attached and closed when the syringe is not attached, and the base end of the sub-exhaust passage is a closed end that allows communication between the sub-passage and the outside. A balloon catheter characterized by: 2. The balloon catheter according to claim 1, wherein the proximal closed end of the sub-passage for exhaustion comprises a member into which an injection needle can be inserted. 3. The proximal closed end of the secondary exhaust passage is made of a breathable and liquid-impermeable member.
Balloon catheter as described in section. 4. In a balloon catheter having a balloon on the outer periphery of the distal end of a catheter body having a main passage, a balloon for inflation extends from the proximal end side to the distal end side of the catheter body and communicates with the internal space of the balloon. A sub-passage for liquid injection and a sub-passage for exhausting air within the balloon and the sub-passage are provided, and a syringe for a liquid for balloon inflation can be attached in a liquid-tight manner to the proximal opening of the sub-passage for injection. and opens when the syringe is installed,
A balloon catheter characterized in that a valve body is provided that is closed when not attached, and the proximal opening of the sub-exhaust passage has an opening/closing means that can freely open and close the opening. 5. The balloon catheter according to claim 4, wherein the opening/closing means is a two-way stopcock. 6. The balloon catheter according to claim 4, wherein the opening/closing means is a valve body that allows the thin tube to be inserted in a liquid-tight state and closes when the thin tube is not inserted. 7. At least one of the valve bodies includes a first notch that opens only on one end surface thereof, and a second notch that opens only on the other end surface, and the first notch and the second notch 7. The balloon catheter according to claim 6, wherein the balloon catheter has a cross section in its interior. 8. The balloon catheter according to claim 7, wherein the valve body is made of a soft elastic material. 9 The first notch consists of a plurality of notches that intersect with each other, the second notch consists of a plurality of notches that intersect with each other, and the first notch and the second notch are arranged inside the valve body. 9. A balloon catheter according to claim 7 or claim 8, wherein the balloon catheters intersect at a single location. 10. The balloon catheter according to any one of claims 7 to 9, wherein the end surface of the valve body is convex.