A device comprising a flexible elongate member having proximal and distal extremities. A flexible coil spring is provided having proximal and distal extremities. The proximal extremity of the coil spring is secured to the distal extremity of the flexible elongate member. A shape-memory alloy element...http://www.google.es/patents/US5423771?utm_source=gb-gplus-sharePatente US5423771 - Flexible elongate device having a distal extremity of adjustable stiffness and method
Flexible elongate device having a distal extremity of adjustable stiffness ...
