Endoscopic instrument assemblies and methods for making and using the same. An example endoscopic instrument assembly includes an endoscope having a working channel and an endoscopic instrument slidably disposed in the working channel. The inside surface of the working channel and the outside surface...http://www.google.se/patents/US20070225554?utm_source=gb-gplus-sharePatent US20070225554 - Endoscope working channel with multiple functionality
