JPH0352305B2 - - 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) send the tip of the catheter body equipped with the balloon from the right ventricle of the heart into the pulmonary artery by blood flow pressure acting on the balloon inflated within the blood vessel; (2) inflate a balloon within the pulmonary artery bifurcation to stop the blood and measure pulmonary artery wedge pressure; (2) dilate the aorta with a balloon inflated in the constricted or pinched portion of the vessel; The coronary blood flow is increased by the pumping action of a balloon that is repeatedly inflated and deflated near the left ventricle of the patient in approximately synchronization with the heart. (4) The balloon that has been inflated within the blood vessel is moved within the blood vessel. In particular, it is used to remove blood clots attached to the inner surface of blood vessels, and (5) to place the catheter body in the bladder by inserting a balloon through the urethra and inflating it within the bladder. .

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, before injecting the balloon inflation liquid into the balloon, fill it with a gas that is easily soluble in blood, such as carbon dioxide. Some balloons are used by inflating the balloon twice, displacing the air and carbon dioxide gas existing inside the balloon and in the sub-channels, and then inflating the balloon by 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 An object of the present invention is to provide a balloon catheter that allows the air in the balloon and the sub-passage to be easily evacuated when an inflation liquid is injected into the balloon.

Structure of the Invention In order to achieve the above object, the present invention has a balloon on the outer periphery of the distal end of a catheter body having a main passage, and extends from the proximal end of the catheter body to the distal end of the catheter body, A balloon catheter having a sub-passage communicating with the internal space of the balloon, and capable of injecting a balloon inflation liquid into the internal space of the balloon from a proximal opening of the sub-passage using a syringe. The first valve body, which closes when the syringe is not attached, and the thin tube for discharging the air in the balloon and the auxiliary passageway to the outside can be inserted in a liquid-tight manner. , a second part that closes when the tubule is not inserted.
The valve body is arranged in parallel with the proximal opening of the sub passage.

Further, in the balloon catheter according to the present invention, the second valve body includes a first notch that opens only on one end surface thereof, and a second notch that opens only on the other end surface thereof, and The cut and the second cut intersect inside the cut.

Further, in the balloon catheter according to the present invention, the second valve body is made of a soft and elastic material.

Further, in the balloon catheter according to the present invention, the first incision of the second valve body consists of a plurality of incisions that intersect with each other, and the second incision consists of a plurality of incisions that intersect with each other, The first cut and the second cut intersect at a single position inside the valve body.

Further, in the balloon catheter according to the present invention, the end surface of the second valve body is made convex.

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 section 11A and a branch section 11B formed on the proximal end side of the straight section 11A. Straight portion 11A of main body 11
has a main passage 12 penetrating from the proximal end side to the distal end side of the straight portion 11A, and the main passage 12 allows a guide wire to be inserted through which the balloon catheter 10 can be introduced into the blood vessel, and a drug, etc. be distributed. Note that the main hub 13 is attached to the base end portion 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. A sub passage 15 is formed in the straight portion 11A and the branched portion 11B of the main body 11, which communicates with the internal space of the balloon 14 from the proximal end side of the branched portion 11B. Branch part 1 of main body 11
A Y-shaped sub-hub 16 is connected to 1B, and the sub-hub 16 has a first sub-path 1 communicating with the sub-path 15.
6A and a second sub-passage 16B are formed.
A valve body 17 for inserting the thin tube 24 is attached to the proximal opening of the first auxiliary passage 16A in the auxiliary hub 16, and an injection valve for injecting balloon inflation liquid is attached to the proximal opening of the second auxiliary passage 16B. A valve body 18 for inserting the container 25 is attached. The valve bodies 17 and 18 are held by caps 19 and 20 that are fitted onto the sub-hub 16. Further, each cap 19, 20 is formed with a passage 19A, 20A.

Here, as shown in FIGS. 3A to 3C, each of the valve bodies 17 and 18 has a first notch 21 that opens only on one end surface, and a second notch that opens only on the other end surface. 22 is engraved, the first
The notch 21 and the second notch 22 are formed in each valve body 1.
7 and 18 intersect. That is, the first notch 21 and the second notch 22
form an intersection 23 with a distance L, so that the thin tube 24 and the syringe 25 are connected to each valve body 17,
It is possible to pass through each of the notches 21 and 22 and their intersection 23 under elastic deformation of 18.

FIG. 4 shows the notches 21 and 2 when inserting the thin tube 24 and the syringe 25 into the valve bodies 17 and 18.
FIG. 5 is an explanatory diagram showing the deformation direction of the valve bodies 17 and 18, and FIG. The valve bodies 17 and 18 are divided into three characteristic parts in the axial direction, that is, a part where only the first notch 21 exists, a part where the intersection 23 exists, and a part where only the second notch 22 exists. When sliced, it becomes three parts 17A to 17C as shown in 1 in FIG. If the valve bodies 17 and 18 are just three separate parts stacked together as shown in 17A to 17C above, each notch 21 when inserting the thin tube 24 or the syringe 25, 2
The deformation direction of 2 becomes the state shown by the arrow 2 in FIG. 4, and the opening shape of each cut 21, 22 after insertion becomes the state shown by 1 in FIG. 5. However, since the valve bodies 17 and 18 are originally integral, each slice portion is influenced by other adjacent portions, and when trying to insert the thin tube 24 or the syringe 25, the cuts 21 and 22 are The direction of deformation is as shown by the arrow 3 in FIG.
18 in the axial direction, and each cut 21, 2 after insertion.
The shape of the opening 2 becomes the state shown by 2 in FIG. That is, the thin tube 24 inserted into the valve bodies 17 and 18,
The circumference of the syringe 25 is continuous in the axial direction by the notches 21 and 22, regardless of whether the outer diameter is relatively small or large. be held down by

Here, the valve bodies 17 and 18 are made of synthetic rubber such as silicone rubber, urethane rubber, or fluorine rubber, or natural rubber or other flexible elastic material. Therefore, each cut 2 of the valve bodies 17 and 18
1 and 22 are in close surface contact with the outer periphery of the thin tube 24 or the syringe 25, and
and the valve bodies 17 and 18 maintain a reliable liquid-tight state. Note that the notches 21 and 2 of the valve bodies 17 and 18
The distance L between the two intersections 23 is the distance L between the valve bodies 17 and 18.
It is determined according to the maximum outer diameter of the thin tube 24 or syringe 25 inserted into the tube.

Although both of the valve bodies 17 and 18 are preferably the valve bodies described above, at least the valve body 17
If it is the valve body described above, then it is true. The valve body 18 may be a conventionally known valve body, for example, the valve body disclosed in Japanese Patent Application Laid-Open No. 152655/1983, or other known valve bodies. In addition, in a vascular catheter, the catheter body is made of polyurethane, polyethylene, etc., and the balloon is made of polyvinyl chloride, silicone rubber, etc.

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 for the urethra, the distal end of the catheter body has a hemispherical closed end, and the distal end side wall is provided with a side hole that communicates the main passage of the catheter body with the outside. is the same as the vascular balloon catheter described above. In urethral balloon catheters, the catheter body is made of latex rubber, silicone rubber, polyvinyl chloride, etc., and the balloon is made of latex rubber, silicone rubber, etc.

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 a 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. Furthermore, in the case of a urethral balloon catheter, the balloon catheter is inserted directly 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 catheter body, and the balloon catheter is inserted into the urethra together with the core bar.

Next, the thin tube 24 is inserted into the passage 19 of the cap 19.
A. Insert through the notches 21 and 22 of the valve body 17 and the first sub-passage 16A, and insert the tip thereof into the sub-passage 15 where the balloon 14 is disposed. Next, the syringe 25 that can inject a balloon inflation liquid such as physiological saline is inserted into the passage 20A of the cap 20 and the notches 21 and 22 of the valve body 18.
5 directs the inflation liquid to the sub passages 15, 16A, 1
At the same time, the air in the balloon 14 and the sub passages 15, 16A, 16B is injected into the thin tube 24.
It is discharged to the outside through. This sub passage 15, 16
When injecting the expansion liquid into A and 16B, the valve body 1
The notches 7 and 18 are in close contact with the circumference of the capillary tube 24 or the syringe 25 without any gaps, thereby maintaining a liquid-tight state and preventing leakage of the inflation liquid.

Following the discharge of air from the thin tube 24, the inflation liquid is discharged from the thin tube 24. and removed from the valve body 17. After that, the syringe 25 infuses the inflation liquid into the sub passages 15, 16A, 16B.
After the balloon 14 is inflated to a predetermined inflated state using only the inflation liquid, the syringe 25 is also removed and the inflated balloon 14 is inflated as described above. Predetermined work is done. When the capillary tube 24 and the syringe 25 are removed in this way, the capillary tube 24 and the syringe 25 are pulled out from the notches 21, 22 of each valve body 17, 18, and at the same time, each notch 21, 22 is completely removed. This creates a closed state and prevents the inflation liquid from leaking out. Here, each valve body 17, 1
Since each of the notches 21 and 22 of 8 is opened only in one end face of each of the valve bodies 17 and 18, the restoring force to the closed state is strong when the thin tube 24 or the syringe 25 is removed, and the other There is no reverse opening operation on the end face side. In addition, the valve bodies 17 and 18 from which the thin tube 24 or the syringe 25 have been removed
Since each of the notches 21 and 22 does not open to the other end surface, the valve body has high pressure resistance against the pressure of the inflation liquid acting on the end surface of each valve body 17 and 18.
Maintains a stable closed state without being deformed by the pressure of the inflation liquid.

In addition, each notch 21 of the valve body 17, 18,
22, whether the inserted thin tube 24 or syringe 25 has a relatively small outer diameter or a relatively large outer diameter, there is a gap around the thin tube 24 or syringe 25. Since the tubes are in close contact with each other in a surface-to-surface contact state, it is possible to adhere in a liquid-tight manner to each of the thin tubes 24 or the syringes 25 having different outer diameters.

FIGS. 6A and 6B are explanatory diagrams showing a first modification of the valve body used in the balloon catheter of the present invention. In this valve body 40, the first notch 41 consists of mutually intersecting notches 41A and 41B, the second notch 42 consists of mutually intersecting notches 42A and 42B, and the first notch 41 and the second notch 41 The notches 42 intersect at a single location inside the valve body 40. According to this valve body 40, it is possible to increase the deformability of each notch 41, 42 while making the length of each notch 41, 42 relatively short. It becomes possible to insert even a thin tube or a syringe with a relatively large outer diameter.

FIGS. 7A and 7B show the second valve body of the present invention.
It is an explanatory view showing a modification. This valve body 60 has a first notch 61 and a second notch 62, and each end face 63, 64 is convex. Therefore, according to this valve body 60, the pressure of the balloon inflation liquid acting on the end face of the valve body 60 is
This makes it possible to more reliably form the closed state of the valve body 60 and the liquid-tight state with respect to the thin tube or the syringe.

FIG. 8 is an explanatory diagram showing a sub-hub 16 using a fourth modification of the valve body of the present invention. This fourth modification is different from the embodiment shown in FIG. The point is that a valve body consisting of a valve body 72 is used. 9th
As shown in the figure, the first valve body 71 has a circular opening 71A in its center, and can prevent the balloon inflation liquid from flowing out when a thin tube or syringe is inserted. 72 has a slit 72A in its center, making it possible to prevent the inflation liquid from flowing out without inserting a thin tube or syringe. Therefore, even when using a set of valve bodies consisting of the first valve body 71 and the second valve body 72, it is possible to reliably prevent the inflation liquid from flowing out from the proximal opening of the sub passage. When injecting the inflation liquid into the balloon, the air in the balloon and the sub-path can be easily discharged.

Specific Effects of the Invention As described above, the present invention has a balloon on the outer periphery of the distal end of a catheter body having a main passage, and extends from the proximal end of the catheter body to the distal end of the catheter body. A balloon catheter having a sub-passage communicating with the internal space of the balloon and capable of injecting a balloon inflation liquid into the internal space of the balloon from the proximal opening of the sub-passage using a syringe. A first valve body that closes when the syringe is not attached, and a thin tube for discharging the air in the balloon and the auxiliary passageway to the outside can be inserted in a liquid-tight manner, A second valve body that closes when the thin tube is not inserted is arranged in parallel with the proximal opening of the sub-passage, so that when the inflation liquid is injected into the balloon, the air inside the balloon and the sub-passage is can be easily discharged.

Further, in the balloon catheter according to the present invention, the second valve body includes a first notch that opens only on one end surface thereof, and a second notch that opens only on the other end surface thereof, and Since the notch intersects with the second notch inside the valve body, thin tubes with various outer diameters over a wide range can be inserted and held in a fluid-tight state within the valve body, and leakage of the inflation liquid can be reliably prevented. In addition, when the thin tube is suddenly pulled out of the valve body, it is possible to reliably prevent the inflation liquid from flowing out, and furthermore, by providing a single valve body, the structure can be simplified.

Further, in the balloon catheter according to the present invention, the second valve body is made of a soft and elastic material, so that each notch of the valve body is in close surface contact with the outer periphery of the capillary, and the valve body and the capillary are in close surface contact. This makes it possible to ensure a liquid-tight state with the

Further, in the balloon catheter according to the present invention, the first incision of the second valve body is formed of a plurality of mutually intersecting incisions, and the second incision is formed of a plurality of mutually intersecting incisions. By intersecting the first notch and the second notch at a single position inside the valve body, the deformability of each notch shall be increased under conditions where the notch length of each notch is relatively shortened. This makes it possible to insert and hold even a thin tube with a relatively large outer diameter through a relatively small valve body.

Further, in the balloon catheter according to the present invention, by making the end surface of the second valve body convex, the pressure of the balloon inflation liquid acting on the end face of the valve body is directed toward the center of the valve body, It becomes possible to more reliably form a closed state of the body and a fluid-tight state with respect to the tubules.

[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 valve body, FIG. 3C is a side view showing the valve body,
FIG. 4 is an explanatory diagram showing the deformation direction of each notch provided in the valve body, FIG. 5 is an explanatory diagram showing the opening shape of each notch provided in the valve body, and FIG. 6A is an explanatory diagram showing the deformation direction of each notch provided in the valve body. FIG. 6B is a side view of FIG. 6A, and FIG. 7A is a plan view showing a second modification of the valve body used in the balloon catheter of the present invention. , FIG. 7B is a side view of FIG. 7A, and FIG. 8 is a third view of the valve body according to the present invention.
A sectional view showing a modification, and FIG. 9 is a perspective view showing the valve body of FIG. 8 taken out. 10... Balloon catheter, 11... Main body,
12... Main passage, 14... Balloon, 15, 16
A, 16B...Sub-passage, 17, 18, 40, 6
0, 71, 72... Valve body, 21, 41, 61...
First cut, 22, 42, 62... Second cut, 23... Intersection, 24... Thin tube, 25...
...Syringe, 41A, 41B, 42A, 42B...
Notches, 63, 64...end faces.

Claims (1)

[Claims] 1. A catheter body having a main passage has a balloon on the outer periphery of the distal end thereof, and extends from the proximal end side of the catheter body to the distal end side of the catheter body, and communicates with the internal space of the balloon. A balloon catheter having a sub-passage and capable of injecting a balloon inflation liquid into the internal space of the balloon from a proximal opening of the sub-passage using a syringe, wherein the syringe can be mounted in a liquid-tight state. In addition, a first valve body that closes when the syringe is not attached, and a thin tube for discharging the air in the balloon and the auxiliary passageway to the outside can be inserted in a liquid-tight state, and are closed when the thin tube is not inserted. A balloon catheter characterized in that a second valve body is arranged in parallel with the proximal opening of the sub passage. 2. The second valve body has 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 are connected to each other. A balloon catheter according to claim 1, which is crossed within the balloon catheter. 3. The balloon catheter according to claim 2, wherein the second valve body is made of a soft elastic material. 4. The first notch consists of a plurality of notches that intersect with each other, and 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. 3. A balloon catheter according to claim 2 or 3, wherein the balloon catheters intersect at a single location. 5. The balloon catheter according to any one of claims 2 to 4, wherein the end surface of the second valve body is convex.