Abstract: A medical device for treating coronary artery disease, peripheral arterial disease or varicose veins includes an elongated support and a heat expandable element of muscle polymer carried on that elongated support. The medical device may also include a heating element. When activated, the heating element produces heat that causes the muscle polymer to expand into a position in closer proximity to the tissue to be treated.

Abstract: An introducer sheath may include a displacement sensor that detects displacement of a catheter within the introducer sheath. The displacement sensor may employ induction-based, optical-based or mechanical-based techniques for detecting the displacement. The displacement sensor may include a display on which the detected displacement is presented to a clinician. The displacement sensor may allow the clinician to provide user input to reset the displacement.