A tissue gripping apparatus including a cylindrical member positioned about a tubular body portion or cannula. The cylindrical member includes a plurality of articulated arms that are movable between engageable and non-engageable positions. A hinge in the articulated arm enhances the tissue gripping...http://www.google.ca/patents/US5203773?utm_source=gb-gplus-sharePatent US5203773 - Tissue gripping apparatus for use with a cannula or trocar assembly
