A retractor and a surgical tool are positioned within a cannula, and a dissection cradle of the retractor is positioned at the distal end of the cannula. The retractor includes a first portion with an axis approximately parallel to the axis of the cannula and a second portion with an axis that can be...http://www.google.es/patents/US7326178?utm_source=gb-gplus-sharePatente US7326178 - Vessel retraction device and method
