A catheter with an integral steerable guidewire converts linear movement of the guidewire to rotational movement at the distal end of the guidewire. The catheter has a guidewire lumen to receive the guidewire. The catheter and guidewire are constructed so that the guidewire can be reciprocated and rotated...http://www.google.co.uk/patents/US5269757?utm_source=gb-gplus-sharePatent US5269757 - Catheter with integral steerable guidewire having linear to rotary movement
