JPH0352530Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a balloon catheter for the carotid artery.

[Background of the idea]

Catheters are widely used as medical devices.
It is extremely useful in diagnosis and therapy.

Recently, a balloon catheter has been developed in which a balloon portion that can be inflated with a filling liquid is provided at the tip of a catheter body.

Therefore, in a carotid balloon catheter used by being inserted into the internal or external carotid artery, it is necessary to be able to selectively guide the thin branches of the internal or external carotid artery. Research and development of selective balloon catheters is being actively conducted.

This super-selective balloon catheter is pulled through the blood vessel by the flow of blood with the balloon section inflated as necessary, and at the branching section, the balloon section is guided into the narrower blood vessel. Conventionally, the following methods have been adopted for this purpose. That is, first, the larger blood vessel is occluded downstream of the branching part using a first catheter with a large balloon part, then a second catheter with a small balloon part is inserted into the blood vessel, and this balloon part is inserted into the branching part. In this method, the blood vessel is guided into the smaller blood vessel.

[Problem that the invention attempts to solve]

However, since conventional super-selective balloon catheters are composed of a tube with the same outer diameter and the same material and a balloon section provided at the tip thereof, the flexibility of the tube as a whole is low. It has been difficult to superselectively introduce the balloon into small branching areas such as the external carotid artery. In particular, if the branch is located far from the introduction port of the balloon catheter,
Alternatively, when inserting a balloon catheter into a blood vessel with severe curvature, the above-mentioned difficulties become significantly greater.

On the other hand, it is conceivable to make the tube as a whole highly flexible, but in this case, the stiffness of the tube would be insufficient, resulting in a problem that it would be inconvenient to handle.

[Purpose of invention]

The present invention was developed based on the above-mentioned circumstances, and its purpose is to enable easy super-selective introduction into the narrow branching areas of blood vessels in the carotid artery, and to be easy to manufacture. The object of the present invention is to provide a carotid artery balloon catheter that can be used in a carotid artery.

[Means for solving problems]

A carotid artery balloon catheter of the present invention is a carotid artery balloon catheter comprising a balloon portion inflatable with a filling liquid at the front end of a catheter body, wherein the catheter body includes a proximal tube communicating with the balloon portion; a distal tube connected to the proximal tube by adhesive bonding so as to communicate with the proximal tube, and the proximal tube has an outer diameter and a wall thickness smaller than that of the distal tube. It is characterized by being small and highly flexible, with an outer diameter of 1.0 mm or less and a length of 10 cm or more.

[Function and effect of the idea]

According to the carotid artery balloon catheter of the present invention, the catheter body has a proximal tube and a distal tube, and the proximal tube has a smaller outer diameter and wall thickness than the distal tube. The proximal tube has great flexibility and has a small outer diameter and a long length, so the characteristics of the proximal tube make it easy to super-selectively introduce it into the narrow branch of the carotid artery. will be achieved. Since the distal tube has less flexibility than the proximal tube, the catheter body has sufficient stiffness for practical use and is easy to handle. Moreover, since the proximal tube and the distal tube are connected by adhesive bonding, manufacturing is easy even though their outer diameters and wall thicknesses are different from each other.

[Specific structure of the idea]

Hereinafter, the specific configuration of the present invention will be explained in detail.

FIG. 1 is an explanatory sectional view showing an example of a carotid artery balloon catheter according to the present invention.

In the figure, 1 is a catheter main body, and 2 is a balloon part.

The catheter body 1 consists of a proximal tube 3 and a distal tube 4.

The proximal tube 3 has a smaller wall thickness, a smaller outer diameter, and greater flexibility than the distal tube 4. 31 is proximal tube 3
41 is a passage of the distal tube 4. The proximal tube 3 is connected to the balloon part 2 so that its passage 31 is airtightly communicated with the internal space of the balloon part 2.

As the constituent material of the proximal tube 3, silicone rubber, polyvinyl alcohol, vinyl chloride resin, urethane rubber, etc. can be used, for example. The proximal tube 3 has an outer diameter of, for example, about 0.4 to 1.0 mm, an inner diameter of, for example, about 0.2 to 0.5 mm, and a length of, for example, about 10 to 30 cm.

As the constituent material of the distal tube 4, for example, silicone rubber, polyethylene, polyamide resin such as nylon, fluororesin, etc. can be used. The distal tube 4 has an outer diameter of, for example, about 0.7 to 2.0 mm, an inner diameter of, for example, about 0.4 to 1.0 mm, and a length of, for example, about 30 to 200 cm.

As the constituent material of the balloon portion 2, for example, silicone rubber, latex rubber, vinyl chloride resin, etc. can be preferably used. Further, the shape and size of the balloon portion 2 are appropriately selected depending on the purpose of use of the balloon catheter and are not particularly limited, but in one specific example, the outer diameter is about 0.5 to 1.6 mm, and the inner diameter is about The length is about 0.2 to 1.3 mm, for example, about 1.0 to 15 mm.

Further, the outer diameter of the balloon portion 2 is usually larger than the outer diameter of the proximal tube 3, but it may be the same diameter. If the diameters are the same, the balloon portion 2 is used in an inflated state. As a means for inflating the balloon part 2, a means for filling the balloon part 2 with a filling liquid is used. The filling liquid may be any liquid conventionally used for this type of application, and is not particularly limited.
Specifically, the filling liquid described in, for example, JP-A-56-7726, JP-A-56-145953, etc. can be used.

Further, the balloon portion 2 may be provided with a pinhole for injecting a medicine or the like, if necessary. In this case, the balloon part 2 is filled with a drug, etc., and inserted into a predetermined site in the carotid artery, and the pressure in the balloon part 2 is further increased, so that the drug, etc. in the balloon part 2 is filled with the drug, etc. can be injected into a blood vessel through a pinhole.

Reference numeral 5 denotes an X-ray opaque chip, which is provided as necessary, for example, to confirm by X-ray photography that the balloon portion 2 is securely positioned at a predetermined part of the human body or the like. .
The chip 5 is formed using an X-ray opaque material such as silver or stainless steel, and its shape and size are not particularly limited, but in one specific example, the outer diameter is about 0.2 to 2 mm. in,
The length is, for example, about 1 to 4 mm.

The connection between the balloon part 2 and the proximal tube 3 and the connection between the proximal tube 3 and the distal tube 4 are as follows.
This is done by bonding with an adhesive, such as a medical silicone adhesive (“Medical Adhesive Type A”,
"MDX4-4210 Medical Elastomer",
(manufactured by Dow Corning).

The carotid artery balloon catheter according to the present invention is
For example, it can be used as follows.

When the tip of a carotid balloon catheter is inserted into the carotid artery, the flexibility of the proximal tube and the bulge of the balloon at the tip (the inside of the balloon is slightly inflated with liquid before use)
The entire carotid artery balloon catheter is pulled forward by the flow of blood, and as a result, the balloon portion is guided to a predetermined site.

In addition, in advance, a parent catheter with a large balloon part is pushed into the carotid artery blood vessel along the blood flow with the balloon part inflated as necessary, and at the branching part of the blood vessel, the parent catheter is inserted into the carotid artery. This causes the larger blood vessel to become occluded. Next, a carotid artery balloon catheter with a small balloon portion is inserted into the blood vessel, and the balloon portion is guided into the narrower blood vessel at the branching portion of the blood vessel.

Alternatively, if the carotid artery balloon catheter is used for a test in which a drug such as an X-ray contrast agent is introduced into another blood vessel by occluding the carotid artery, a pinhole is made in the balloon part of the carotid artery balloon catheter in advance. Then, the balloon section is inflated with a drug and inserted into the carotid blood vessel to occlude the blood vessel, and by further increasing the pressure inside the balloon section, the drug is dispersed into the blood vessel through the pinhole. .

As described above, according to the carotid artery balloon catheter according to the present invention, the catheter body 1 has the proximal tube 3 and the distal tube 4, and the proximal tube 3 is smaller than the distal tube 4. Since both the outer diameter and wall thickness of the tube are small and the tube is highly flexible, the characteristics of the proximal tube 3, which is highly flexible, can be used to introduce the tube into the carotid artery, i.e., at the branching point. Induction into smaller blood vessels is easily achieved. Since the distal tube 4 has less flexibility than the proximal tube 3, the catheter body 1 has sufficient strength for practical use, and is easy to handle. Moreover, since the proximal tube 3 and the distal tube 4 are connected by adhesive bonding, it is possible to reliably connect the two even though their outer diameters and wall thicknesses are different from each other. and therefore can be easily manufactured.

When silicone rubber is used as the material for the balloon portion 2, proximal tube 3, and distal tube 4, and these are bonded together using a medical silicone adhesive to construct a carotid artery balloon catheter, Super-selective guidance can be easily achieved, the balloon catheter has high biocompatibility, the bonding strength of the balloon catheter can be increased, and the surface can be made smooth. .

The carotid artery balloon catheter according to the present invention is
The configuration is not limited to the above configuration, and various changes can be made. For example, the outer diameter of the balloon portion may be equal to the outer diameter of the proximal tube, in which case the balloon portion is used in an inflated state.

[Specific Examples] Hereinafter, specific examples of the carotid artery balloon catheter according to the present invention will be described.

<Example 1> Based on the configuration shown in FIG. 1, a carotid artery balloon catheter according to the present invention was manufactured in the following manner.

The configuration of each part is as follows.

(1) Balloon part Made of silicone rubber, outer diameter is 0.7mm, wall thickness is 140-170μm, effective length of balloon part is 2-3mm.
mm.

(2) Proximal tube Consists of a silicone rubber tube with an outer diameter of
The inner diameter is 0.64mm, the inner diameter is 0.30mm, and the length is 10-30cm.

This proximal tube has a smaller outer diameter and wall thickness than the distal tube described below, and is highly flexible.

(3) Distal tube Consists of a silicone rubber tube with an outer diameter of
1.10mm, inner diameter 0.60mm, length 120-140cm.

(4) X-ray opaque chip It is made of silver and has a rod shape with an outer diameter of 0.4 mm and a length of 1.5 mm, and is fixed inside the balloon part with silicone adhesive.

The balloon part with the above configuration, the proximal tube, and the distal tube are glued in order with medical silicone adhesive "Medical Adhesive A Type" or "MDX4-4210 Medical Elastomer" (
(manufactured by Dow Corning) to manufacture a carotid artery balloon catheter according to the present invention.

According to this balloon catheter for the carotid artery, high flexibility is effectively exhibited due to the shape and characteristics of the proximal tube, making it easy to super-selectively guide blood vessels in the carotid artery, that is, the thin branch of the internal carotid artery or the external carotid artery. In addition, the strength of the distal tube can be effectively utilized, making it easy to handle. The joints of each part are strong and durable, and the surface is smooth, allowing for smooth introduction into small blood vessels. Furthermore, since the proximal tube and the distal tube are connected by bonding with an adhesive, manufacturing is easy.

[Brief explanation of drawings]

FIG. 1 is an explanatory longitudinal sectional front view schematically showing an example of a superselective balloon catheter according to the present invention. 1...Catheter body, 2...Balloon part, 3
... Proximal tube, 4 ... Distal tube, 3
1, 41... passage, 5... X-ray opaque chip.

Claims (1)

[Claims for Utility Model Registration] A carotid artery balloon catheter comprising a balloon part inflatable with a filling liquid at the front end of a catheter body, the catheter body comprising a proximal tube communicating with the balloon part, and a proximal tube communicating with the balloon part; and a distal tube connected by adhesive bonding so as to communicate with the proximal tube, the proximal tube having a smaller outer diameter and wall thickness than the distal tube. A balloon catheter for the carotid artery, which is highly flexible, has an outer diameter of 1.0 mm or less, and a length of 10 cm or more.