JP2003126263A - Balloon catheter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a balloon catheter wherein the distortion of the internal tube during an operation is prevented. SOLUTION: For an external tube 1, a balloon 1a is provided at the distal end section, and at the same time, the rear end section is connected with a holder 3. An internal tube 2 is inserted in the external tube 1, and the distal end section of the internal tube 2 is connected with the distal end section of the external tube 1. At the same time, the rear end section of the internal tube 2 is connected with a needle pipe 4 for sliding, which is supported by the holder for this balloon catheter. In the balloon catheter, rotation-restricting means 5 and 10 for the needle pipe 4 for sliding are provided in a space between the holder 3 and the needle pipe 4 for sliding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a balloon type catheter, and more particularly to a balloon type catheter for preventing twist damage of an inner tube.

[0002]

2. Description of the Related Art When performing a dilatation operation on a mitral valve of a heart whose opening area is narrowed due to adhesion or the like, a balloon type catheter (Inouye balloon catheter) is passed through the blood vessel instead of a surgical operation and A surgical technique has been employed in which the balloon mechanically causes the narrowed mitral valve to expand. The balloon-type catheter used in this surgical method forms a balloon at the tip of the outer tube and inserts the inner tube into the outer tube to connect the tip portions to each other. The rear end of the inner tube is connected to the holder while the rear end of the inner tube is connected to the sliding needle tube, and the sliding needle tube is slidably supported by the holder.

When performing a mitral valve dilatation operation using this balloon type catheter, the balloon at the distal end of the outer tube is elongated and elongated so that it can be easily inserted and introduced into the affected area. Then, in the left atrium, to release the stretched state of the balloon and guide the balloon into the mitral valve, use the stylet to rotate the stylet handle to the left or right near the sliding needle tube, push, Pull or operate. When the balloon reaches the mitral valve, saline is injected from the holder side between the outer tube and the inner tube to inflate the balloon so that the narrowed mitral valve can be expanded.

However, as described above, when the tip of the catheter is inserted while the stylet is operated near the sliding needle tube, or when it is desired to twist the catheter, the sliding needle tube becomes infinitely rotatable. Therefore, the practitioner may unconsciously or consciously rotate the sliding needle tube. If the rotation becomes 3 to 4 rotations, the soft inner tube connected to the sliding needle tube may be twisted, and the members such as the guide wire and the stylet inserted into the inner tube may not be taken out. Further, if the member in this state is forcibly pulled out, the member may be torn. On the contrary, the member to be inserted may not be inserted, and the operation may have to be interrupted.

[0005]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to provide a balloon type catheter in which the inner tube is not twisted during an operation.

[0006]

According to the present invention, which achieves the above object, a balloon is provided at a tip end portion, and an inner tube is inserted into an outer tube whose rear end portion is connected to a holder. In the balloon catheter, which is connected to the distal end of the outer tube and the rear end of the outer tube is connected to the sliding needle tube to support the sliding needle tube in the holder, between the holder and the sliding needle tube. It is characterized in that a rotation regulating means for regulating the rotation of the sliding needle tube is provided.

Since the rotation regulating means for the sliding needle tube is provided in this way, the rotation is regulated even if the sliding needle tube is rotated during the operation, and therefore the inner tube may be twisted during the operation. Absent. Therefore, it is easy to pull out a member such as a guide wire inserted in the inner tube, and the operation is not interrupted due to an operation error.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 illustrates a balloon type catheter (mitral valve dilatation catheter) of the present invention, and FIG.
(B) and (c) show the main part of this catheter.

In FIGS. 1 and 2, 1 is an outer tube made of a flexible resin, 2 is an inner tube made of the same flexible resin inserted in the outer tube 1, and 3 is a holder. The outer tube 1 is provided with a mitral valve-expanding balloon 1a at its tip and its rear end is connected to a holder 3. In addition, the inner tube 2 has a distal end connected to the distal end of the balloon 1a of the outer tube 1, and a rear end connected to the sliding needle tube 4, and the sliding needle tube 4 is slidably supported by the holder 3. Has been done.

The holder 3 is constructed such that an injection pipe 32 for injecting physiological saline solution is branched into a Y shape in a cylindrical holder body 21, and a cap 33 is detachably attached to the rear end portion. .

The sliding needle tube 4 is supported slidably in the axial direction with respect to the holder 3 and has a rear end portion protruding rearward and outward. A large diameter portion 4a is formed in a portion of the sliding needle tube 4 protruding from the holder 3, and an operation hub 6 is fixed to the large diameter portion 4a. The operation hub 6 is used when slidingly operating the inner tube 2 by moving the sliding needle tube 4 in the axial direction.

A projection 8 is provided on the operation hub 6, and the position can be locked by engaging this with a stopper groove 7 provided on the holder 3 side. The operation hub 6 is locked when the balloon 1a is extended. Further, the C-shaped ring 11 and the O-ring 12 are inserted into the cap 33 portion of the holder 3.
The C-shaped ring 11 is a large diameter portion 4 of the slidable needle tube 4
a is prevented from moving into the holder 3, and the O-ring 12 seals the inside of the holder 3 and seals the sliding needle tube.

A sliding needle tube 4 located inside the holder 3.
A fan-shaped piece 10 is fixed to the. This fan-shaped piece 1
0 is inserted in a fan-shaped groove 5 provided on the holder main body 31 side, and when the piece 10 is rotated together with the sliding needle tube 4, the piece 10 is prevented from rotating in the circumferential direction by a certain angle or more due to the groove 5. It is a rotation regulation means to regulate. This rotation angle is such that the hub 6 can be locked and unlocked.
The rotation regulation means regulates the sliding needle tube 4 so as not to rotate indefinitely.

Inside the sliding needle tube 4, a balloon extension pipe 9 and a stylet 14 used when extending the balloon 1a can be inserted. As shown in FIG. 4, the stylet 14 is made of a coil spring over its entire length and is flexible, and has a distal end bent and a handle 1 at the proximal end.
5 is attached.

The tip ends of the balloon extension pipe 9 and the stylet 14 inserted inside the sliding needle tube 4 as described above are stopped by the pipe stopper 16. Therefore, by locking the balloon extension pipe 9 to the hub 6 and then engaging the protrusion 8 of the hub 6 with the stopper groove 7, the balloon 1a can be held in an extended state. The stylet 14 is inserted until the tip is stopped by the pipe stopper 16, and the tip of the balloon can be freely manipulated by rotating the handle 15 or pushing and pulling.

When the mitral valve is subjected to a dilatation operation with the above-mentioned balloon type catheter, the balloon 1a is extended and the balloon 1a is elongated so that the tip of the catheter is inserted into the venous blood vessel without stimulating the blood vessel. Make it easier. Also, the stylet 14 freely manipulates the tip of the balloon to guide the balloon 1a at the tip to the mitral valve. Balloon 1
When “a” reaches the affected part of the mitral valve, the saline injection tube 3
Inject physiological saline from 2 to inflate the balloon 1a,
Inflate the mitral valve.

When inserting the catheter as described above, even if the sliding needle tube 4 is unintentionally or consciously rotated, the fan-shaped piece 10 is restricted from being rotated by the fan-shaped groove 5, so that the sliding needle can be slid. The needle tube 4 does not rotate beyond a certain angle. Therefore, the inner tube 2 is not twisted during the operation, and a smooth operation can be performed.

3 (a) and 3 (b) show another embodiment of the balloon type catheter (mitral valve dilatation catheter) of the present invention.

In this embodiment, as the rotation restricting means of the sliding needle tube 4, the sliding needle tube 4 is supported by the cap 33 of the holder 3 instead of the concavo-convex structure of the fan-shaped piece 10 and the fan-shaped groove 5 described above. The portion having a square cross section is formed as shown in FIG. 3 (b). The cross-sectional shape is not necessarily limited to a square cross-sectional shape as long as it is a non-circular shape, and may be an oval shape, an oval shape, or the like in addition to a triangular shape or more.

Further, in this embodiment, the rotation restricting means prevents the sliding needle tube 4 from rotating at all, so that the above-mentioned projection 8 and stopper groove 7 serve as a stopper for fixing the operation hub 6. From the relationship, the hook 8'which is elastically deformed in the radial direction and the stopper hole 7'are combined. Except for the above, the configuration is almost the same as that of the embodiment of FIGS. 1 and 2.

Although the above-mentioned embodiments have been described for the case of the mitral valve dilatation catheter, the present invention can be applied to catheters other than the mitral valve dilatation catheter as long as they are balloon type catheters.

[0022]

As described above, according to the balloon type catheter of the present invention, since the rotation regulating means for the sliding needle tube is provided, the rotation is regulated even if the sliding needle tube is rotated during the operation. The inner tube does not twist during surgery. Therefore, the member such as the guide wire inserted in the inner tube can be easily removed, and the operation is not interrupted due to an operation error.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a partially omitted embodiment of a balloon catheter of the present invention.

2 (a) is a vertical cross-sectional view showing the main part of the balloon catheter of FIG. 1, (b) is a cross-sectional view taken along the line XX of (a),
(C) is a Y arrow view of (a).

3A and 3B show a balloon catheter according to another embodiment of the present invention, FIG. 3A is a longitudinal sectional view of a main part, and FIG. 3B is a sectional view taken along line ZZ of FIG.

FIG. 4 is a side view showing a part of the stylet.

[Explanation of symbols]

1 outer tube 1a balloon 2 inner tube 3 holder 31 Holder body 33 caps 4 Sliding needle tube 4a large diameter part 5 (fan-shaped) groove 6 Operation hub 9 Balloon extension pipe 10 (fan-shaped) pieces 14 stylet

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Zenji Yamazaki             1-1 1-1 Sonoyama, Otsu City, Shiga Prefecture Toray Co., Ltd.             Ceremony company Shiga business site F term (reference) 4C167 AA07 BB02 BB04 BB09 BB10                       BB12 BB26 BB27 BB29 BB30                       BB39 BB40 CC08 CC19 DD01                       HH03

Claims (3)

[Claims] 1. An inner tube is inserted into an outer tube having a distal end portion provided with a balloon and a rear end portion connected to a holder, and the inner tube distal end portion is connected to the outer tube distal end portion. In a balloon type catheter in which a portion is connected to a sliding needle tube and the sliding needle tube is supported by the holder, a rotation restricting means for restricting rotation of the sliding needle tube is provided between the holder and the sliding needle tube. The provided balloon catheter. 2. The balloon type catheter according to claim 1, wherein the rotation restricting means is constituted by an uneven portion which engages with each other in the circumferential direction between the sliding needle tube and the holder. 3. The balloon type catheter according to claim 1, wherein the rotation restricting means is configured such that at least a part of a fitting portion of the sliding needle tube with respect to the holder has a non-circular cross-sectional shape.