JP2001333984A - Balloon catheter - Google Patents

Abstract

(57) [Problem] To provide a balloon catheter capable of freely adjusting the bending strength of a shaft according to the purpose of use. A balloon (5) is attached to a tip of a shaft (2),
The shaft 2 comprises at least a flexible front part 2F and at least a rigid base part 2B (12B, 22B, 32B), and has openings 9F, 9B at the front and rear ends inside the front part 2F. And a guide wire tube 4 having a guide wire lumen 6 is disposed, and the base end 2B (12B, 22B, 32B) is attached to the main body 2H.
(12H, 22H, 32H) and the transition 2T (12T, 2H,
2T, 32T) via the small diameter section 2SD (12SD, 22T)
SD, 32SD) are integrally formed, and the transition portion 2T (1
2T, 22T, 32T) and small diameter section 2SD (12SD, 2T
2SD, 32SD) are balloon catheters 1 arranged in the front part 2F.

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 more particularly to a rigid proximal end (or shaft pipe) constituting a shaft. Sometimes)).

[0002]

2. Description of the Related Art For example, Japanese Unexamined Patent Publication No. Heisei 511159/1997 discloses that a rigid base end (shaft pipe) constituting a shaft is further provided with a reinforcing member made of a separate member. A balloon catheter having a welded core is disclosed. However, the connection form between the rigid base end and the reinforcing core material has a problem such as kink due to a sudden change in bending strength, and is not always satisfactory in use. 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] In 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 end portion 2F.
B (12B, 22B, 32B), with openings 9F, 9B at the front and rear ends inside the front part 2F, respectively.
And a guide wire tube 4 having a guide wire lumen 6 is disposed, and the base end 2B (12
B, 22B, 32B) are the main body 2H (12H, 22H, 3
2H), a small diameter portion 2SD (12SD, 22SD, 32SD) is integrally formed via a transition portion 2T (12T, 22T, 32T), and the transition portion 2T (12T, 22T, 32T) is formed.
T) and small diameter section 2SD (12SD, 22SD, 32SD)
Provides the balloon catheter 1 disposed in the front part 2F. [2] The present invention relates to the base end 2B (12B, 22B, 3
The bending strength of the main body 2H (12H, 22H,
32H, the balloon catheter 1 according to [1], which is formed so as to decrease toward the small diameter portion 2SD (12SD, 22SD, 32SD) through the transition portion 2T (12T, 22T, 32T). [3] In the present invention, the base portion 2B may be a tubular main body 2H.
A slit 2S parallel to the longitudinal direction of the base end 2B.
The balloon catheter 1 according to [1] or [2], wherein the small-diameter portion 2SD is integrally formed via the transition portion 2T formed with. [4] In the present invention, the base end portion 12B may be a tubular body 12
The balloon catheter 1 according to [1] or [2], wherein the small diameter portion 12SD is formed integrally with the H through a transition portion 12T formed with a slit 12S and a tapered shape.
I will provide a. [5] The present invention is characterized in that the base end portion 22B is
The balloon catheter 1 according to [1] or [2], wherein the small diameter portion 22SD is integrally formed with the H through a transition portion 22T formed with a slit 22S and a spiral shape. [6] In the present invention, the base end portion 32B includes a tubular main body 32.
The balloon catheter 1 according to [1] or [2], wherein the small diameter portion 32SD is formed integrally with the H through a transition portion 32T formed in a coil shape.

[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 of a proximal end 2B constituting the balloon catheter of FIG. 1 ((A) is a side view, (B)
Is a view (A) of FIG. Balloon catheter 1
Attaches the balloon 5 to the tip of the shaft 2 and
Is composed of at least a flexible front portion 2F and at least a rigid base end portion 2B (shaft pipe). In the present invention, the constituent material of the flexible front portion 2F is, for example, polyamide, polyamide elastomer, polyester,
Synthetic resins such as 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-Ti, Cu-Mn.
-A metal such as an Al-based alloy can be used. The flexible front portion 2F and the rigid base end 2B can be connected by, for example, an adhesive, a heat seal, or the like. 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. Alternatively, the rear portion of the rigid base portion 2B 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.

[0005] Inside the front portion 2F, a guide wire tube 4 having openings 9F and 9B at the front and rear ends thereof and having a guide wire lumen 6 is disposed. More specifically, the guide wire tube 4 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. The base portion 2B forms a small diameter portion 2SD on the main body 2H via a transition portion 2T,
The distal end of the base end 2B, the transition portion 2T, and the small diameter portion 2SD are arranged in the front portion 2F. More specifically, the base end 2B is described in detail. A small-diameter portion 2SD is integrally formed on a tubular main body 2H via a transition portion 2T in which a plurality of parallel slits 2S are formed along the length direction of the base end 2B. Have been. The outer diameter of the transition portion 2T is substantially the same as the main body 2H, and the small diameter portion 2SD
Extends from the end of the transition portion 2T and is formed in a curved plate shape. By forming the base end portion 2B as described above, (a) a smooth change in bending strength occurs in the direction of the small diameter portion 2SD from the tip end of the main body 2H via the transition portion 2T, and a kink of the flexible front portion 2F is formed. (B) It is possible to obtain the effects of (b) improving the insertion and passage of the catheter.

FIG. 3 is a schematic view ((A) is a side view, and (B) is a view taken in the direction of arrow A in (A)) showing another embodiment of the base end portion in FIG. The proximal end portion 12B is formed by integrating a plurality of slits 12S in the tubular main body 12H in the radial direction of the proximal end portion 12B and forming a small diameter portion 12SD through a transition portion 12T formed in a tapered shape tapering toward the balloon 5. Is formed. The small diameter portion 12SD is formed substantially at the center of the base end portion 12B, and is formed in a rod shape (or a tubular shape). By forming the base end portion 12B as described above, the same operation and effect as those of the base end portion 2B (a) can be obtained, and the injection of the contrast agent is facilitated. Operational effects such as shortening of time can be achieved.

FIG. 4 is a schematic diagram ((A) is a side view, and (B) is a view taken in the direction of arrow A in (A)) showing another embodiment of the base end portion in FIG. The base end portion 22B has a plurality of slits 22S formed in a tubular main body 22H and is formed in a spiral shape (a member excluding the slit 22 is spirally bundled).
, A small diameter portion 22SD is integrally formed. The small diameter portion 22SD is formed substantially at the center of the base end portion 22B, and is formed in a spiral shape. By forming the base end portion 22B as described above, the same operation and effect as those of the base end portion 2B can be obtained, and in particular, by forming the transition portion 22T in a spiral shape, the constituent material of the main body 22H is formed. However, even if the pipe is thin, it is possible to obtain an effect such as an increase in strength.

FIG. 5 is a schematic view ((A) is a side view, and (B) is a view taken in the direction of arrow A in (A)) showing another embodiment of the base end portion in FIG. The base end portion 32B has a slit 32S formed at the distal end of the tubular main body 32H, and a small diameter portion 3 is formed through a transition portion 32T formed in a coil shape in front of the slit 32S.
2SD is integrally formed. The outer diameter of the transition portion 32T is substantially the same as that of the main body 32H, and the small-diameter portion 32SD extends from the end of the transition portion 32T and is formed in a curved plate shape. By forming the base end portion 32B as described above, the same operation and effects as those of the base end portion 2B (a) can be obtained, and in particular, by forming the transition portion 32T in a coil shape, the transition portion 32T is made flexible. And the transition unit 32
Since the lumen of T can be ensured, it is possible to achieve the effects such as shortening of the balloon expansion time.

[0009]

As described above, the balloon catheter 1 of the present invention has a rigid proximal end 2B (12B, 22B).
B, 32B) is formed integrally with the main body 2H (12H, 22H, 32H) via the transition portion 2T (12T, 22T, 32T) to form the small-diameter portion 2SD (12SD, 22SD, 32SD) and the base end 2B (12B). , 22B, 32B) from the main body 2H (12H, 22H, 32H) through the transition portion 2T (12T, 22T, 32T) to the small diameter portion 2SD.
(12SD, 22SD, 32SD), so that a reinforcing core material made of a separate component is provided at the rigid base end (shaft pipe) constituting the shaft like a conventional balloon catheter. The bending strength of the shaft can be freely adjusted according to the purpose of use without welding.

[Brief description of the drawings]

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

FIG. 2 shows a proximal end portion 2 of the balloon catheter shown in FIG.
Schematic diagram of B ((A) is a side view, (B) is a view of (A) in the direction of arrow A))

FIG. 3 is a schematic view showing another embodiment of the base end portion in FIG. 2 ((A) is a side view, (B) is a view in the direction of arrow A in (A)).

FIG. 4 is a schematic view showing another embodiment of the base end portion in FIG. 2 ((A) is a side view, and (B) is a view in the direction of arrow A in (A)).

FIG. 5 is a schematic view showing another embodiment of the base end portion in FIG. 2 ((A) is a side sectional view, and (B) is a view in the direction of arrow A in (A)).

[Explanation of symbols]

 Reference Signs List 1 balloon catheter 2 shaft 2F front part 2B, 12B, 22B, 32B base part 2H, 12H, 22H, 32H main body 2SD, 12SD, 22SD, 32SD small diameter part 2S, 12S, 22S, 32S slit 2T, 12T, 22T, 32T Transition section 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 (guide wire tube) 10 Adhesive

Claims (6)

[Claims] 1. A balloon 5 is mounted on the tip of a shaft 2,
The shaft 2 includes at least a flexible front portion 2F and at least a rigid base portion 2B (12B, 22B, 32B). Inside the front portion 2F, openings 9 are provided at the front and rear ends, respectively.
F, 9B and a guide wire tube 4 having a guide wire lumen 6 are disposed, and the base end 2B (12B, 22B, 32B) is a main body 2H.
(12H, 22H, 32H) and the transition 2T (12T, 2H,
2T, 32T) via the small diameter section 2SD (12SD, 22T)
SD, 32SD) are integrally formed, and the transition portion 2T (1
2T, 22T, 32T) and small diameter section 2SD (12SD, 2T
2SD, 32SD) are arranged in the front part 2F. 2. The base portion 2B (12B, 22B, 32
B) The bending strength of the main body 2H (12H, 22H, 3
2. The balloon catheter 1 according to claim 1, wherein the balloon catheter 1 is formed so as to decrease from 2H) to a small diameter portion 2SD (12SD, 22SD, 32SD) through a transition portion 2T (12T, 22T, 32T). . 3. A small-diameter portion 2SD is formed integrally with the base end 2B via a transition portion 2T in which a parallel slit 2S is formed along the longitudinal direction of the base end 2B in the tubular main body 2H. The balloon catheter 1 according to claim 1, wherein 4. The base end 12B has a tubular body 12H.
3. The balloon catheter 1 according to claim 1, wherein a small-diameter portion 12SD is integrally formed through a transition portion 12T having a slit 12S and a tapered shape. 5. The base 22B has a tubular body 22H.
3. The balloon catheter 1 according to claim 1, wherein a small-diameter portion 22SD is integrally formed with a transition portion 22T formed with a slit 22S and formed in a spiral shape. 6. The tubular body 32H has a proximal end 32B.
3. The balloon catheter 1 according to claim 1, wherein a small-diameter portion 32SD is integrally formed via a transition portion 32T formed in a coil shape.