A guidewire or a catheter for crossing vascular occlusions comprises a shaft having a proximal end and a distal end, and a drive member having a proximal and a distal end, the drive member being rotatably disposed within and along a longitudinal axis of the guidewire shaft. An actuator is connected to...http://www.google.com.au/patents/US6258052?utm_source=gb-gplus-sharePatent US6258052 - Guidewire and catheter with rotating and reciprocating symmetrical or asymmetrical distal tip
