JPS63139566A - Balloon catheter - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a catheter equipped with a separable occlusion balloon for occluding a body fluid flow path such as a blood vessel.

(Prior Art) Occlusion balloons are used for the purpose of occluding arteries, mainly blood vessels, in percutaneous surgical operations for congenital heart diseases such as patent ductus arteriosus.

As such a balloon for occlusion, for example, Japanese Patent Application Laid-Open No. 57-
No. 5 (1072) discloses a balloon catheter whose balloon portion can be separated at a target site.

However, in this balloon catheter, the structure of the balloon portion is complicated and is not suitable for miniaturization, and if the balloon is expanded by mistake, the balloon cannot be deflated again. Furthermore, since the balloon is simply fitted to the tip of the catheter, there is a problem that it may accidentally fall off during the operation.

Furthermore, Japanese Patent Laid-Open No. 59-34269 also discloses a balloon catheter device similar to Habo, but in this case as well, the balloon and camera are connected only by fitting, so it is possible to accidentally drop the balloon. In order to prevent this from falling off, it may be possible to make the joint at the fitting part larger, but in that case, it would be difficult to separate the balloon, and it would put an excessive burden on the blood vessel to be occluded. This may also cause damage to the balloon itself.

A possible method for joining the balloon and catheter is to screw them together via a screw groove, etc., but in that case, when separating the balloon at the distal end, it is difficult to transmit the torque to the balloon joint, making it difficult to separate the balloon. In addition, there is a problem that the balloon may be damaged due to tearing due to the torque.

(Problems to be Solved by the Invention) According to the present invention, there is no fear of the balloon falling off during operation, the balloon can be reliably introduced into the target occlusion site, and even if the balloon is expanded by mistake, the filling The purpose of the present invention is to provide a catheter with a balloon that can be reduced to its original size before gelation.

Furthermore, the present invention aims to provide a balloon catheter in which the state of occlusion caused by the balloon can be easily confirmed from the outside.

Furthermore, the present invention aims to provide a catheter with a balloon that is structurally simple, allows the balloon to be miniaturized, and is free from the risk of the balloon being damaged.

(Means for Solving the Problems) As a means for solving the above problems, the present invention provides a catheter body with a triple tube structure, in which an occlusion balloon is attached to the tip of the inner tube. The proximal end of the occlusion balloon is detachably grasped with the tip of the outer middle tube, and the tip of the middle tube is opened and closed with the tip of the outer outer tube.
As a result, we adopted a configuration that allows the balloon to be freely attached and detached using the middle tube.

More specifically, the present invention basically consists of an expandable balloon having an opening at its base, an inner tube whose tip is removably inserted into the opening of the balloon, and an inner nuclear tube. A middle tube is provided coaxially with a gap on the outside, and has a chuck part consisting of a plurality of gripping pieces that expand and open so as to freely close at the distal end, and a coaxial tube with a gap on the outside of the cough tube. and an outer tube provided at the inner tube, and by pulling the chuck portion of the middle tube into the outer tube, the chuck portion is closed by the distal end of the outer tube and grips the base peripheral wall of the balloon. By providing a catheter with a balloon, characterized in that when the chuck portion of the inner tube protrudes from the tip of the outer tube and is released, the chuck can release the grip on the base of the balloon. This has succeeded in solving the above problems.

In the above basic configuration, the middle pipe and the outer pipe have a connector provided with a check valve at the base, the middle pipe is led out through the check valve of the outer pipe, and the inner pipe is connected to the middle pipe. The catheter may be led out through a check valve to prevent backflow of body fluids such as blood when the distal end of the catheter is inserted into the body.

Furthermore, an injection port may be connected to each of the check valves of the inner tube and the outer tube, and a filling liquid injection port for balloon expansion may be connected to the base of the inner tube.

Furthermore, the balloon before expansion may be appropriately stored at the distal end of the outer tube.

Further, the balloon may have a thick wall portion formed in the circumferential direction at the middle portion in the longitudinal direction, so that the balloon assumes a gourd shape when expanded.

(Function) The catheter with a balloon according to the present invention has a catheter body having a triple tube structure, in which a occlusion balloon is attached to the tip of the inner tube, and a base of the occlusion balloon is attached to the tip of the outer middle tube. The end of the balloon can be grasped in a detachable manner, and the tip of the inner tube can be opened and closed using the tip of the outer tube to ensure the attachment and detachment of the balloon, so when the balloon is introduced into the blood vessel. In this case, the balloon is securely held at the distal end of the middle tube, so there is no fear of the balloon falling off, and the introduction operation becomes extremely easy.

Furthermore, even if the balloon is inflated by mistake, the filling liquid in the balloon can be discharged through the inner tube while the balloon is held in the middle tube before the filling gels. Furthermore, by including an X-ray opaque substance in the balloon, the state of occlusion of the balloon can be easily confirmed from the outside.

Furthermore, by appropriately enlarging the inner diameter of the outer tube tip, the unexpanded balloon can be accommodated in the outer tube tip, thereby making it possible to reliably avoid damage to the balloon.

(Example) The present invention will be described below with reference to an illustrated embodiment.

FIG. 1 shows the distal end of a balloon-equipped catheter according to the present invention. As is clear from this figure, a catheter body 1 includes an outer tube 2 and an inner tube 3 disposed coaxially with each other.
It has a triple tube structure including an inner tube 4 and an inner tube 4. The inner tube 4 has a slightly thinner end 4a, which is fitted into the opening 5b of the base 5a of the balloon 5 and communicates with the inside of the balloon 5.

The middle tube 3, which is provided outside the inner tube 4 with a gap therebetween, has a chuck portion 6 formed at its distal end thereof, which is composed of a plurality of gripping pieces 6a that expand and open so that they can be freely closed. As shown in FIG. 2, the gripping pieces 6a constituting this chuck part 6 are composed of four pieces, each of which is integrally formed with the inner tube 3, and which are normally open toward the distal end, with the inner diameter of the opening tip being It is sufficiently larger than the outer diameter of the balloon base 5a. Hooks 6C that protrude inward from each other are formed at the tips of the gripping pieces 6a, respectively. This hook 6C is inserted into the peripheral wall surface of the base portion 5a of the balloon 5 when the balloon is joined as shown in FIG.
hold.

The outer tube 2, which is provided outside the inner tube 3 with a gap therebetween, has an inner diameter at its tip that is sufficiently smaller than the expanded diameter of the chuck 5 of the middle tube 3. As a result, the chuck 6 is pressed or released from the outside by moving the inner tube 3 inward or outward from the outer tube 2, so that it can be opened and closed freely.

The balloon 5 is expandable at its forward end from the base 5a as shown in FIG. 3 by introducing a filler through the inner tube 4. Note that the balloon 5 may contain an X-ray opaque substance, for example, a black and white marker, a gold marker, or the like.

Next, the overall structure of this balloon catheter will be explained.

As shown in FIG. 4, the bases of the inner tube 3 and outer tube 2 are connected to check valves 8a via connectors 7a and 7b, respectively.

It is connected to 8b. Note that these connectors 7a, 7
b does not necessarily have to be provided, and the bases of the inner tube 3 and the outer tube 4 may be directly connected to the check valves 13a, 3b. Further, the middle pipe 3 passes through the check valve 8b of the outer pipe 4 and is led out from the outer pipe 4, and the inner pipe 4 passes through the check valve 8a of the middle pipe 3 and leads out from the middle pipe 4.
It is derived from This prevents backflow of body fluids such as blood when the distal end of the catheter is inserted into the body.

As shown in FIG. 4, these check valves 8a and 8b are connected to injection ports 10a and 10b, such as three-way stopcocks or three-way stopcocks, via connection tubes 9a and 9b, respectively. By continuously or intermittently injecting physiological saline or the like, it is possible to eliminate blood and other body fluids that enter the outer tube 2 and the inner tube 3 during catheter operation. This is to prevent blood or the like from entering the catheter and coagulating, interfering with catheter operation.

The base of the inner tube 4 is connected to the injection port 10c via the connector 7C.
A three-way stopcock (preferably a three-way stopcock or a three-way stopcock) is connected so that a filling material for balloon expansion can be injected.

As the material for the inner tube 4, middle tube 3, and outer tube 2, thermoplastic resins such as polyethylene, polyolefin, ethylene-vinyl acetate copolymer, polyester, polyvinyl chloride, polyurethane, fluorine resin, and nylon are generally used. .

The material of the balloon 5 can be appropriately selected from elastic materials such as silicone rubber, polyurethane, and latex. In addition, a mesh made of nylon, polyethylene terephthalate, polyurethane, etc. is built into the wall thickness of the balloon 5,
It may be arranged not to expand beyond a certain shape.

Next, a method of using the balloon-equipped catheter having this configuration will be explained.

First, with the balloon 5 held at its tip as shown in FIG. 1, a catheter is introduced to a desired balloon base site. During this introduction operation, the balloon base 5a is connected to the middle tube 3.
Since it is strongly held by the chuck 6 at the tip, there is no risk of it falling off.

Once the balloon 5 is positioned at the indwelling site in this way,
A filling material for balloon expansion, such as silicone RTv (silicon rubber K
E 12 RTV manufactured by Shin-Etsu Chemical Co., Ltd.), gelable liquids such as cross-linked modified polyvinyl alcohol (X
A radiopaque substance may be mixed therein) into the balloon 5 by four people, and the balloon 5 is inflated to the required size as shown in FIG. In this case, it is also possible to mix the above-mentioned X-ray opaque substance into the filling and operate under X-ray fluoroscopy.

Next, when the filling in the balloon 5 has finished hardening,
The outer tube 2 is moved back relative to the middle tube 3 and the inner tube 4. As a result, the chuck 6 automatically opens as shown in FIG.
The connection with the balloon base 5a is removed. Then, by pulling the inner tube 4 toward the base, the distal end 4a of the inner tube 4 can be separated from the balloon base 5a, allowing only the balloon 5 to remain at the desired indwelling site.

During this catheter operation, if necessary,
Injection port) Physiological saline is injected continuously or intermittently through ports 10a and 10b.

In the above embodiment, the outer tube 2 has the same diameter as the whole, but as shown in FIG. It is also possible to use an outer tube 2 with an enlarged inner diameter at the tip 2a so that the outer tube 5 can be accommodated therein. This is preferable in order to prevent damage to the balloon 5 while it is being introduced to the indwelling position.

Furthermore, the shape of the balloon 5 is not limited to that of the above embodiment, but as shown in FIG. 5d may be attached or buried.

Furthermore, as shown in FIG. 7, a thick portion 5e may be formed in the middle of the expanded portion of the balloon 5, so that when the balloon 5 is expanded, it assumes a gourd shape as shown in FIG.

(Effects of the Invention) According to the balloon-equipped catheter of the present invention, the catheter body has a triple-tube structure, and a chuck that can be opened and closed is provided at the tip of the middle tube to hold or release the balloon. There is no risk of the balloon falling off during operation, and the balloon can be easily recovered.

Furthermore, even if the balloon is inflated by mistake, it can be deflated again via the inner tube before the filling gels. Furthermore, the balloon can be housed in the outer tube to prevent damage to the balloon. In addition, because the balloon part is structurally simple, the device can be made smaller, which has other remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view showing the distal end portion of the balloon occlusion catheter according to the present invention, FIG. 2 is a perspective view showing only the middle tube of the catheter, and FIG. A cross-sectional view showing an enlarged state,
FIG. 4 is a schematic diagram showing an example of the overall configuration of a balloon catheter for occlusion according to the present invention; FIG. 5 is a cross-sectional view showing another embodiment of the balloon-equipped catheter of the present invention in correspondence with FIG. 1; FIGS. 6 to 8 are cross-sectional views showing other variations of the balloon. In the figure, 1...catheter body, 2...outer tube, 22.
... Outer tube tip, 3... Middle tube, 4... Inner tube, 4a.
... Inner tube tip, 5... Balloon, 5a... Balloon base, 5b... Opening, 6... Chuck, 6a...
...Gripping piece, 6...Hook, 7 a, 7 b
, 7c...connector, 8a. 8b...Check valve, 9a, 9b...Connection tube, 1
0a. 10b, 10c... Injection port. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 3 Figure 5 Figure 6 Figure 7r:! J Figure 8

Claims (11)

[Claims] (1) An expandable balloon with an opening formed at its base;
An inner tube whose tip is removably inserted into the opening of the balloon, and a plurality of grips that are provided coaxially with a gap on the outside of the inner tube and expand and open so that they can be freely closed at the tip. It comprises an inner tube provided with a chuck section consisting of a piece, and an outer tube coaxially provided with a gap on the outside of the inner tube, and the chuck section of the inner tube is drawn into the outer tube. As a result, the chuck part closes and grips the base circumferential wall of the balloon by the distal end of the outer tube, and when the chuck part of the middle tube protrudes from the distal end of the outer tube and is released, the chuck part closes and grips the base peripheral wall of the balloon. A catheter with a balloon, characterized in that the grip on the base can be released. (2) The middle pipe and the outer pipe are each provided with a check valve at their base, the middle pipe is led out through the check valve of the outer pipe, and the inner pipe is led out through the check valve of the middle pipe. 2. A balloon-equipped catheter according to claim 1, which is led out to the outside and is adapted to prevent backflow of body fluids such as blood when the distal end of the catheter is inserted into the body. (3) The balloon-equipped catheter according to claim 2, wherein injection ports are connected to the check valves of the inner tube and the outer tube, respectively. (4) The catheter with a balloon according to claim 1, wherein an injection port for filling liquid for balloon expansion is connected to the base of the inner tube. (5) The inner tube, middle tube or outer tube is made of polyethylene, polypropylene, ethylene vinyl acetate copolymer, polyester,
The balloon-equipped catheter according to claim 1, which is molded from a resin selected from the group consisting of polyvinyl chloride, polyurethane, fluororesin, or polyamide resin. (6) The balloon-equipped catheter according to claim 1, wherein the balloon expansion filler is a substance that is liquid at the time of injection and becomes gel-like after a certain period of time has passed after injection. (7) The balloon-equipped catheter according to claim 6, wherein the filling contains an X-ray opaque substance. (8) The balloon-equipped catheter according to claim 1, wherein the balloon is molded from at least one material selected from the group consisting of silicone rubber, polyurethane, latex, and the like. (9) The balloon-equipped catheter according to claim 1, wherein the balloon has a thick portion formed in the circumferential direction at its longitudinally intermediate portion, so that the balloon assumes a gourd shape when expanded. (10) Claims in which the balloon has a built-in mesh molded from at least one selected from nylon, polyethylene terephthalate, and polyurethane within its wall thickness, and is molded so as not to expand beyond a prescribed shape. The balloon-equipped catheter according to item 8. (11) The catheter with a balloon according to claim 8, wherein a marker made of an X-ray opaque material is attached to the balloon.