Patent ID: 8758422

Claim:
A balloon catheter comprising: a catheter shaft and an expandable balloon, the expandable balloon having an expanded state and an unexpanded state, a proximal end and a distal end, the expandable balloon being positioned around a distal region of the catheter shaft, the expandable balloon having a length, and being defined by a proximal end, a distal end, and a working portion extending therebetween, in the unexpanded state the expandable balloon comprising a collapsed portion disposed about the catheter shaft and at least one wing extending from the collapsed portion, the wing having a wrapped state and an unwrapped state, in the wrapped state the wing is wrapped about the collapsed portion, wherein the wing in the wrapped state provides a surface of the balloon which extends further outward in a radial direction from the catheter shaft at the distal end of the balloon than at the proximal end of the balloon; the wing in the unwrapped state extending from the collapsed portion along a wing base which extends parallel to the longitudinal axis of the catheter shaft, the wing having an edge which extends from one end of the wing base to the other end of the wing base, wherein in the wrapped state the edge forms a continuous spiral at least part of the way about the longitudinal axis of the catheter shaft, the continuous spiral extending along a majority of the length of the edge; and the wing in an unwrapped state extending from the collapsed portion along a wing base which extends parallel to the longitudinal axis of the catheter shaft and having a wing tip which extends parallel to the longitudinal axis of the catheter shaft, wherein, in the wrapped state, the wing base extends parallel to the longitudinal axis of the catheter shaft and the wing tip extends non-parallel to the longitudinal axis of the catheter shaft.