The cardiac mapping lead comprises a main body portion and a tip portion having a tip. The main body portion is relatively flexible longitudinally and relatively stiff in a rotational sense so as to be torque transmitting when rotated. The tip portion includes a relatively flexible body having a preformed...http://www.google.es/patents/US4777955?utm_source=gb-gplus-sharePatente US4777955 - Left ventricle mapping probe
