Patent ID: 7909844

Claim:
A catheter, the catheter comprising an inner shaft, an outer shaft, and a balloon, the inner shaft disposed within the outer shaft, the balloon engaged to the outer shaft, the outer shaft defining an inflation lumen in fluid communication with the balloon, the catheter further comprising a first electroactive polymer and a second electroactive polymer, each electroactive polymer having an actuated state and a non-actuated state, the first electroactive polymer forming an inner surface of the outer shaft, the second electroactive polymer forming an outer surface of the inner shaft, the inflation lumen having a first diameter when each of the first and second electroactive polymers is in the actuated state, the inflation lumen having a second diameter when each of the first and second electroactive polymers is in the non-actuated state, the first diameter being greater than the second diameter, each shaft having a thickness, the thickness of each shaft being greater when the electroactive polymer is in the non-actuated state than when the electroactive polymer is in the actuated state.