Surgery – Means for introducing or removing material from body for... – Treating material introduced into or removed from body...
Patent
1989-07-10
1991-08-27
Yasko, John D.
Surgery
Means for introducing or removing material from body for...
Treating material introduced into or removed from body...
604100, 606192, A61M 2500
Patent
active
050429760
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a balloon catheter for intravascular indwelling which has an inflatable balloon at its distal end, and a method of manufacturing the same.
PRIOR ART
The distal end portion of a conventional balloon catheter for intravascular indwelling of this type is inserted in a blood vessel by using an insertion tool such as an introducer, and the balloon catheter is indwelled in a predetermined portion. In this state, measurements, therapy, and the like are generally performed.
The outer diameter (before inflation) of the balloon attached to a conventional balloon catheter is larger than that of the catheter, and the balloon is exposed outside. When the balloon catheter is to be inserted into a blood vessel, the balloon is caught by a check valve or the inner wall of the insertion equipment and is undesirably damaged.
In another conventional balloon catheter, the outer diameter of the distal end portion of a catheter is set to be smaller than that of the remaining portion of the catheter and a balloon is mounted on the small-diameter portion. Although the catheter can be inserted into a blood vessel by using a sheath having the same diameter as that of the catheter and a blood vessel is not so damaged, the outer diameter of the balloon is larger than that of the distal end portion of the catheter at the upper end portion of the balloon and a step is formed between the balloon and the distal end of the catheter. The balloon tends to be brought into direct contact with a check valve or the like arranged at an insertion port of blood vessel insertion equipment and may be damaged. In still another conventional balloon catheter, the boundary portions of the upper end of a balloon and the distal end of a catheter are potted by an adhesive and the distal end portion of the catheter is smoothly coupled to the balloon mounting surface.
In this case, damage to the balloon can be eliminated. However, since the outer diameter of the balloon is larger than that of the distal end of the catheter, a sheath having a diameter corresponding to the balloon diameter larger than that of the catheter must be used and a blood vessel tends to be damaged by the catheter. In addition, since the potted portions are not formed of the same material as that of the potted members, peeling of the adhered portions occurs. Thus, a danger caused by intravascular indwelling of the catheter cannot be perfectly eliminated.
The diameter of the balloon catheter for intravascular indwelling of this type is very small, and therefore it is difficult to mass-produce the structure in which the diameter of the balloon is set to be smaller than that of the adjacent catheter.
It is an object of the present invention to provide a compact balloon catheter and a method of manufacturing the same, wherein a balloon mounted on the catheter will not be caught and damaged by a check valve or inner wall member of blood vessel insertion equipment, and a sheath having a diameter larger than the catheter need not be used during insertion, thereby preventing damage to the blood vessel.
It is another object of the present invention to provide a balloon catheter which does not damage an inner wall of a blood vessel and in which a balloon can be symmetrically inflated.
It is still another object of the present invention to provide a balloon catheter and a method of manufacturing the same, which are free from natural contraction of the inner cavity at the distal end portion of the catheter as well as contraction or deformation of the inner cavity (e.g., a balloon cavity or a pressure cavity) which is caused by a tensile force of a string for mounting the balloon.
DISCLOSURE OF THE INVENTION
According to an aspect of the present invention, there is provided a balloon catheter comprising: a catheter body formed as a single member and made of a flexible tube provided with at least one inner channel with an opening at a distal end portion thereof, the catheter body being provided with an annular groove formed on an outer surface o
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Ishitsu Yoshio
Sekii Shigekazu
Tsuchida Kouji
Gutowski Anthony
Terumo Kabushiki Kaisha
Yasko John D.
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