Patent ID: 8784476

Claim:
An expandable balloon for insertion in a fluid conduit of the human or animal body, in combination with a stent, the balloon being movable between a collapsed condition and an expanded condition, and the balloon being supported in the collapsed condition on a shaft, and the balloon having, when in the expanded condition, a centre line which follows a substantially helical path whereby the balloon has a helical shape wherein the helical centre line of the balloon has a helix angle less than or equal to 65°, wherein the balloon has a substantially circular cross-section without helical ribs or helical vanes protruding into an interior of the balloon, wherein the stent is expandable by the balloon from a collapsed condition to an expanded condition, and wherein the expanded condition the stent has a helical shape which corresponds to the helical shape of the balloon including the substantially helical centre line thereof such that the expanded stent has said substantially helical centre line.