US 5,042,976 AGranted

Balloon catheter and manufacturing method of the same

AssigneeTerumo Kabushiki Kaisha

InventorsYoshio Ishitsu, Kouji Tsuchida, Shigekazu Sekii

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Abstract

A balloon catheter is provided, which comprises a catheter body made of a flexible tube provided with at least one inner channel and with an annular groove formed on an outer surface near the distal end portion of the tube, and a balloon covering the annular groove in such a manner that the outer diameter of the balloon is equal to or smaller than a maximum diameter of the distal end portion of the tube, the balloon being expanded or shrunk through another inner channel. A method of manufacturing the balloon catheter which comprises the steps of reducnig an outer diameter of a distal end portion of the catheter body while keeping a desired inner channel undamaged, mounting a tubular heat-resistant member to a prospective balloon mounting portion of the reduced diameter portion, molding a reduced diameter portion extruded from the heat-resistant member into a spherical shape, and mounting an inflatable balloon to the balloon mounting portion after removing the heat-resistant member.

Claims12

Dependent claims

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 of the tube and including a distal wall adjacent to the distal end portion, a proximal wall, and a bottom portion extending a predetermined length along an axial direction of the tube between said distal and proximal walls, and with a balloon inflation inner channel open to said bottom portion of the annular groove;
and a balloon secured to the catheter body for covering the bottom portion of the annular groove, the balloon being arranged in the annular groove such that an outer surface of a distal end portion of the balloon is contacted with, and is secured by a binding means to, the bottom portion of the annular groove adjacent said distal wall, with the rest of the balloon being everted over said binding means, with the proximal end of the balloon secured near the proximal wall, with the entire outer diameter of the balloon in its deflated state being equal to or smaller than a maximum outer diameter of the distal end portion of the tube.

Dependencies are inferred from the claim text.