A novel reducer system is provided for a trocar cannula. The reducer system fastens to the cannula end and a living hinge allows a reducer cap to be closed over the cannula lumen to allow the cannula to be used with smaller diameter surgical instruments. By fastening the reducer system to the exterior...http://www.google.ca/patents/US5868714?utm_source=gb-gplus-sharePatent US5868714 - Trocar reducer system
