A cannula useful for endoscopic surgery. The cannula includes an outer tube in which an inner tube is removably seated. A surgical instrument can be positioned at the surgical site through the inner tube and irrigation fluid can be flowed to the surgical site through the inner tube. The tubes are spaced...http://www.google.fr/patents/US20050043690?utm_source=gb-gplus-shareBrevet US20050043690 - Cannula that provides bi-directional fluid flow that is regulated by a single valve
Cannula that provides bi-directional fluid flow that is regulated by a ...
