A multi-patient use trocar assembly is disclosed. The trocar assembly has obturator and cannula subassemblies. The obturator subassembly has an elongated obturator shaft which can receive an endoscope at its distal end. The obturator shaft is reusable for multi-patient use. A transparent obturator...http://www.google.es/patents/US5817061?utm_source=gb-gplus-sharePatente US5817061 - Trocar assembly
