A trocar assembly (70) formed from a trocar tube subassembly (74) and a separable, interfitting trocar subassembly (72). The trocar tube assembly includes a head (112) having a bore (120) into which a trocar tube (116) is fitted and a manually operated slide valve assembly (118) mounted transversely...http://www.google.com/patents/US4601710?utm_source=gb-gplus-sharePatent US4601710 - Trocar assembly
