| 主权项 |
1. A balloon catheter having a purge hole configured with a duplex tube structure of an inner tube and an outer tube both of which having an opening at a distal end thereof, in which the distal end of the outer tube is arranged in a position offset from the distal end of the inner tube by a given distance toward a rear end, a balloon is provided to stretch over a section between the distal ends of the inner tube and the outer tube, and a balloon lumen for expanding and contracting the balloon with sterilized water is provided between the inner tube and the outer tube with a distal end of the balloon lumen opened to the inner tube, wherein
a purge hole, through which the remaining air inside the balloon lumen and the balloon is discharged to a main lumen formed in the inner tube when the balloon is expanded, and which is closed by the balloon when the balloon is contracted, is provided on the inner tube covered by the balloon. |
