JPH043230B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a balloon catheter with improved strength at the tip of the catheter and a method for manufacturing the same.

[Conventional technology]

Conventionally, the tip of a balloon catheter has been processed by inserting a pipe or rod having approximately the same diameter as the pressure cavity in advance so as not to deform the pressure cavity. However, if these pipes or rods are removed after the tip has been processed, the bore diameter of the tip will naturally gradually decrease. Furthermore, when the balloon is wrapped with an attachment thread or the like when attaching the balloon, the tension of the thread may deform or contract the inner cavity of the balloon cavity or the inner cavity of the pressure cavity. This causes problems such as worsening of the balloon's inflation/deflation response and pressure response. others,
A method has also been proposed in which a metal ring is attached to the surface of the balloon and the balloon is wrapped with a thread over the metal ring, but this method cannot prevent the spontaneous contraction of the cavity at the tip of the catheter.

[Problem that the invention seeks to solve]

The present invention provides a balloon catheter in which there is no risk of natural contraction of the lumen at the distal end of the catheter or contraction or deformation of the lumen such as the balloon cavity or pressure cavity due to the winding tension of the balloon attachment thread, and a method for manufacturing the same. The purpose is to provide.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention has adopted a method of inserting cylindrical reinforcing members into each necessary lumen of the distal end of the balloon catheter.

That is, in the present invention, a cylindrical reinforcing member is fixed to the inner surface of each lumen over at least the entire portion covered with the balloon, and the inner diameter of the reinforcing member is connected to the inner diameter of the lumen before and after the reinforcing member. The present invention provides a balloon catheter characterized in that the balloon catheter has the same inner diameter and is connected by a substantially smooth surface.

Further, in the present invention, a cylindrical reinforcing member is fixed to the inner surface of each lumen over at least the entire portion covered with the balloon, and the inner diameter of the reinforcing member is connected to the lumen before and after the reinforcing member. A method for manufacturing a balloon catheter, characterized in that the balloon catheter has the same inner diameter as the catheter and is connected by a substantially smooth surface,
A cylindrical reinforcing member is inserted into a necessary lumen of a catheter body for a balloon catheter having a plurality of inner diameters so as to include at least a balloon-covered portion, and then the tip portion including the balloon-covered portion is reduced in diameter. The present invention provides a method for manufacturing a balloon catheter, which is characterized in that the tip is processed and a balloon is attached to the reduced diameter portion with the reinforcing member left in place.

Note that it is preferable that the inner cavity of the reinforcing member has the same inner diameter as the inner cavity communicating therewith, and that they are connected to each other by forming a smooth surface. Further, the reinforcing member is preferably made of an antithrombotic material or antithrombotic treated material (for example, heparin, silicone, etc.).The reinforcing member may be made of plastic, as long as it is heat resistant and hard enough to withstand tip processing.
Metal materials etc. can be selected as appropriate. The reinforcing member is cylindrical, and the word cylindrical here refers to a broad concept including pipe-like, coil-like, mesh-like cylinders, and the like.

[Function] According to the present invention, a cylindrical reinforcing member is inserted into the lumen of the distal end of the balloon catheter, and the lumen is contracted.
Since deformation is prevented, deterioration of the balloon's expansion/contraction response, measured pressure response, etc. can be prevented, and the tip processing can be facilitated.

〔Example〕

Hereinafter, the present invention will be explained with reference to the illustrated embodiments.

FIG. 1 shows a balloon catheter 1 according to the present invention.
The tip of the balloon 2 is shown. This tip part has a nearly convex tip 1a.
, a narrow diameter part 1b formed adjacent to this, a balloon 2 provided so as to cover this narrow diameter part 1b and fixed with a thread 3, and a pressure measurement cavity 1c, for example, opened at the tip 1a. and a balloon cavity 1 that opens at the narrow diameter portion 1b and communicates with the inside of the balloon 2.
d, a pipe-shaped first reinforcing member 4 fitted into the tip (including the balloon attachment part) of the pressure measurement cavity 1c, and a pipe-shaped first reinforcing member 4 fitted into the tip (including the balloon attachment part) of the balloon cavity 1d. It is composed of a pipe-shaped second reinforcing member 5 inserted therein. These first and second reinforcing members 4 and 5 have the same inner diameter as the inner diameters of the communicating inner cavities 1c and 1d, respectively, and are connected to form a smooth surface.

This balloon catheter 1 can inflate the balloon 2 by introducing carbon dioxide gas, air, or other fluid into the balloon 2 through the balloon cavity 1d, as shown in FIG. 2, as in the conventional balloon catheter 1. It's becoming like that.

Next, a manufacturing example of this balloon catheter 1 will be explained.

First, as shown in FIG. 3, the first and second reinforcing members 4 and 5 are fitted in advance into the necessary lumens 7 and 8 of the catheter body 1' for a balloon catheter, which has a plurality of lumens formed therein. . In this case, lumens 7, 8
As shown in FIG. 4, only the insertion portions of the reinforcing members 4 and 5 are formed larger than the other portions by the thickness of the reinforcing members 4 and 5. Note that the reinforcing member 4 is installed below the tip processed portion 1b' (FIG. 5).
Next, the diameter is reduced by a predetermined length by heat forming using a glass mold or a metal mold (see FIG. 5). Note that harmonic waves or high frequency waves may be used for this diameter reduction process. Next, with a stainless steel tubular body (not shown) that can be divided into two in the longitudinal direction inserted into this reduced diameter portion, the tip 1a is shaped into a convex shape such as a mushroom shape using a glass or metal mold. Process the tip. At this time, it is preferable that the uppermost end of the reinforcing member 4 coincides with the most distal end of the catheter. In this case as well, any method such as thermoforming, ultrasonic processing, high frequency processing, etc. may be used. Furthermore, the balloon cavity 1d is installed at a predetermined location.

Next, one end of the balloon 2 made of a silicone rubber tube or latex rubber is fixed to the distal end portion with a thread as shown in FIG. processing and assembly are completed.

〔Effect of the invention〕

As detailed above, according to the present invention, the reinforcing member is inserted into the required lumen of the catheter, so the lumen contracts during and after processing the tip of the balloon catheter, and when attaching the balloon. Or there is no risk of deformation. Therefore, there is no risk of deterioration of the balloon inflation/deflation response or the measured pressure response as in the prior art.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a balloon catheter according to the present invention, FIG. 2 is a sectional view showing the balloon in FIG. It is sectional drawing which shows sequentially. In the figure, 1...Balloon catheter, 1a...Catheter tip, 1b...Small diameter portion, 1b'...Tip processed portion, 1c...Pressure measurement cavity, 1d...Balloon cavity, 2...Balloon, 3... ... Thread, 4... First reinforcing member, 5... Second reinforcing member, 7, 8... Inner cavity.

Claims (1)

[Scope of Claims] 1. A cylindrical reinforcing member is fixed to the inner surface of each lumen over at least the entire portion covered with the balloon, and the inner diameter of the reinforcing member is connected to the inner surface of the inner lumen before and after the reinforcing member. A balloon catheter characterized in that the balloon catheter is connected by a substantially smooth surface that has the same inner diameter as the lumen. 2. The balloon catheter according to claim 1, wherein the reinforcing member is made of an antithrombotic material. 3. The balloon catheter according to claim 1, wherein the reinforcing member is treated with antithrombotic treatment. 4. The balloon catheter according to claim 1, wherein the reinforcing member is made of heat-resistant hard plastic. 5. The balloon catheter according to claim 1, wherein the reinforcing member is made of metal. 6. A cylindrical reinforcing member is fixed to the inner surface of each lumen over at least the entire area covered by the balloon, and the inner diameter of the reinforcing member is the same as the inner diameter of the lumen communicating with the lumen before and after the reinforcing member. A method for manufacturing a balloon catheter, characterized in that the balloon catheter is connected by a substantially smooth surface, the catheter body having a plurality of inner diameters including at least a balloon-coated portion in a necessary lumen. A cylindrical reinforcing member is inserted in such a manner that the balloon is covered with a cylindrical reinforcing member, and then the distal end portion including the balloon covering portion is processed to have a smaller diameter, and the balloon is attached to this reduced diameter portion while the reinforcing member remains. A method for manufacturing a balloon catheter, characterized by: