JP2002000736A - Balloon catheter - Google Patents

Abstract

(57) [Problem] To provide a balloon catheter in which pushability and passage property in a stenosis part are remarkably improved. A balloon (5) is attached to a tip of a shaft (2),
The shaft 2 is composed of at least a flexible front portion 2F and at least a rigid base portion 2B, and has a guide wire tube 4 having openings 9F and 9B at the front and rear ends and having a guide wire lumen 6, respectively. The reinforcing member 3 (13) is disposed from the side surface of the front portion 2F to the distal end of the balloon 5 via the inside of the balloon 5, and is provided in the fluid lumen 7 formed between the front portion 2F and the outer periphery of the guide wire tube 4. ) And the reinforcing member 3 (1
3) The side of the reinforcing member 3 (13) is connected to the guide wire tube 4 and the front portion 2F without directly bonding the rear end of the base end 3B (13B) to the front end of the base end 2B. Balloon catheter 1 (11) adhered to the side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a balloon catheter used for, for example, percutaneous coronary angioplasty (PTCA) and the like, and more particularly to an improvement of a mounting form of a reinforcing member disposed in a shaft. .

[0002]

2. Description of the Related Art PTCA is used as a treatment for ischemic diseases such as myocardial infarction and angina. A PTCA balloon catheter is used for PTCA, and a rapid exchange (monorail) type that can insert a guide wire from the middle of a shaft tube is frequently used. In the case of a monorail type catheter, a metal tube such as a stainless steel pipe is used for the shaft to increase the rigidity of the shaft, and a stainless steel core wire is used as a reinforcing member to prevent kink of the guide wire insertion portion with the balloon and the shaft (metal tube). There are many products mounted in a plastic tube disposed between them (for example, Japanese Patent Laid-Open Publication No. Hei 9-511159 (a separate member is added to the tip of a rigid base end (shaft pipe) constituting a shaft). A balloon catheter in which a reinforcing core material is welded is disclosed)). However, although the base end of the core wire is joined to the metal tube, the tip end is placed in the tube lumen without being adhered to the plastic tube, so the torque transmission is poor and there is a problem with the passage of stenosis. Had occurred. The inventor of the present invention has made intensive studies in order to solve the above-mentioned problems, and has arrived at the following invention.

[0003]

Means for Solving the Problems [1] According to the present invention, a balloon 5 is mounted on the distal end of a shaft 2, and the shaft 2 has at least a flexible front portion 2F and at least a rigid proximal portion 2F.
B, with openings 9F and 9 at the front and rear ends, respectively.
B, and a guide wire tube 4 having a guide wire lumen 6 is arranged from the side surface of the front portion 2F to the distal end of the balloon 5 through the inside of the balloon 5;
The reinforcing body 3 (13) is provided in the fluid lumen 7 formed between the front portion 2F and the outer periphery of the guide wire tube 4.
And the base end 3B of the reinforcing body 3 (13)
(13B) A balloon catheter in which the side of the reinforcing body 3 (13) is bonded to the side of the guide wire tube 4 and the side of the front part 2F without directly bonding the rear end to the front end of the base part 2B. 1 (11) is provided. [2] According to the present invention, a small-diameter portion 13E is provided behind the base portion 13B of the reinforcing member 13, and the small-diameter portion 13E is not directly adhered to the base portion 2B. The balloon catheter 11 according to [1], which is disposed over a fluid lumen 7 formed over 2B.

[0004]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a balloon catheter 1 of the present invention which is called a rapid exchange type.
(A cross-sectional view, in which the cross-sectional view near the connector 8 is shown smaller than the cross-sectional view near the front portion 2F). FIG. 2 is a schematic view (cross-sectional view) showing another embodiment of the balloon catheter of the present invention. The balloon catheter 1 (11) has a balloon 5 attached to the distal end of a shaft 2, and the shaft 2 is composed of at least a flexible front portion 2F and at least a rigid base portion 2B (also referred to as a shaft pipe). Then, a guide wire tube 4 having openings 9F and 9B respectively formed at the front end and the rear end and having a guide wire lumen 6 is arranged from the side surface of the front portion 2F to the front end of the balloon 5 through the inside of the balloon 5. I have. Further, the reinforcing member 3 (13) is disposed in the fluid lumen 7 formed between the front portion 2F and the outer periphery of the guide wire tube 4, and after the base end portion 3B (13B) of the reinforcing member 3 (13). Without directly bonding the end to the distal end of the base end 2B, the reinforcing body 3
The side portion of (13) is adhered to the side portion (outer wall surface) of the guide wire tube 4 and the side portion (inner wall surface) of the front portion 2F (in FIG. 1 and FIG. 2, B is a bonding portion). ).

In the present invention, "adhesion" means adhesion by heat (heat) sealing, an adhesive or the like, or an adhesion means substantially equivalent thereto. Further, in the present invention, to adhere the side portion of the reinforcing body 3 (13) to the side portion (outer wall surface) of the guide wire tube 4 and the side portion (inner wall surface) of the front portion 2F,
As shown in FIGS. 1 and 2, the front portion 3F of the reinforcing member 3 (13)
The side portion of (13F) is partially adhered to the side portion (outer wall surface) of the guide wire tube 4 and the base end portion 3B (1
The side part of 3B) may be partially adhered to the side part (inner wall surface) of the front part 2F, or two or more of any one of the front part 3F (13F) to the base end part 3B (13B). This means that any two or more of the side part (the outer wall surface) of the guide wire tube 4 and the side part (the inner wall surface) of the front part 2F may be partially bonded.

As the reinforcing member 3 (13) used in the present invention, for example, as shown in FIG. 1 and FIG.
A core wire formed in a tapered shape from 3B) toward the distal end portion 3F (13F) is used, but any material can be used as long as it performs substantially the same function as these core wires. Can be. In the balloon catheter 1 shown in FIG. 1, the rear end of the proximal end 3B of the reinforcing member 3 is disposed without a direct contact with the distal end of the shaft 2 but with a slight contact or a slight gap (about 1 mm). . In the balloon catheter 11 of FIG.
The rear end of the base end portion 13B is arranged with a gap from the front end of the shaft 2, a narrow portion 13E is provided behind the base end portion 13B of the reinforcing member 13, and the narrow diameter portion 13E is connected to the base end portion 2B. Without directly adhering to the fluid lumen 7 formed in the front part 2F and the front part of the base end part 2B.

In the present invention, the material constituting the flexible front portion 2F is, for example, polyamide, polyamide elastomer,
Synthetic resins such as polyester, polyethylene, polyimide, and PET can be used. In the present invention, the constituent material of the rigid base portion 2B is, for example, stainless steel, Ni-T
i, a metal such as a Cu-Mn-Al-based alloy can be used. Flexible front part 2F and rigid base end 2B
Can be connected by means of, for example, an adhesive or heat sealing. The rear portion of the rigid base portion 2B is disposed in the tubular body 8a in front of the connector 8, and is fixed by filling an adhesive 10 between the inner periphery of the tubular body 8a and the outer periphery of the rigid base portion 2B. Have been. Or rigid proximal end 2
The rear portion of B and the connector 8 can be fixed by insert molding. The rear end of the tubular body 8b behind the connector 8 is formed with an opening 8B for introducing a balloon expanding fluid.

[0008]

The balloon catheter 1 (1) of the present invention
1) is that the force applied to the proximal end portion 2B of the shaft 2 when pushed into the blood vessel is directly applied to the front portion 2F and the guide wire tube 4 via the reinforcing member 3 (13) (core wire).
Since the light is transmitted linearly, the pushability of the catheter and the passage property at the stenosis part are remarkably improved. Further, in the balloon catheter 11 of the present invention, the proximal end 13
B, a small-diameter portion 13E extends from the front portion 2F to the base 2 without directly bonding the small-diameter portion 13E to the base 2B.
Since it is arranged in the fluid lumen 7 formed in the inside B, no kink is generated between the front part 2F and the base part 2B, and the front part is more distant from the base part 2B than the balloon catheter 1. The torque transmission to the 2F and the guide wire tube 4 is further improved.

[Brief description of the drawings]

FIG. 1 is a schematic view (cross-sectional view) of a balloon catheter of the present invention.

FIG. 2 is a schematic view (cross-sectional view) showing another embodiment of the balloon catheter of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 11 Balloon catheter 2 Shaft 2F Front part 2B Base end part 3, 13 Reinforcement body 3F, 13F Front part 3M, 13M Intermediate part 3B, 13B Base end part 13E Small diameter part 4 Guide wire tube 5 Balloon 6 Guide wire lumen 7 Fluid lumen 8 Connector 8B Opening (connector) 8a, 8b Tubular body 9F, 9B Opening (tube for guide wire) 10 Adhesive B Adhesive

Claims (2)

[Claims] 1. A balloon 5 is mounted on the tip of a shaft 2,
The shaft 2 is composed of at least a flexible front part 2F and at least a rigid base part 2B. A guide wire tube 4 having openings 9F and 9B at the front and rear ends and having a guide wire lumen 6 is provided. The reinforcing member 3 (13) is disposed from the side surface of the front portion 2F to the distal end of the balloon 5 through the inside of the balloon 5 and inside the fluid lumen 7 formed between the front portion 2F and the outer periphery of the guide wire tube 4. )
And the base end 3B of the reinforcing body 3 (13)
(13B) The side of the reinforcing member 3 (13) was bonded to the side of the guide wire tube 4 and the side of the front part 2F without directly bonding the rear end to the front end of the base part 2B. Characteristic balloon catheter 1 (11). 2. A small-diameter portion 13E extends behind the base end portion 13B of the reinforcing member 13, and the small-diameter portion 13E extends from the front portion 2F to the base end portion 2B without directly bonding the small-diameter portion 13E to the base end portion 2B. The balloon catheter (11) according to claim 1, wherein the balloon catheter (11) is disposed in a fluid lumen (7) formed over the balloon.