IMPROVED BALLOON CATHETER

摘要

An expansible balloon catheter (10) has at least a first exterior surface (2 7) with a given coefficent of friction and a second exterior surface (32) with a great er coefficient of friction. In a compact form only the first exterior surface is exposed to produce one coefficient of friction during transfer of the collapsed or uninflated ballo on to and across a lesion. When inflated, the second surface dominates the first surface and produces a second coefficient of friction.