A surgical instrument includes a hollow member having a sidewall provided with a window and a closure member movably connected to the hollow member for alternately covering and uncovering the window. The hollow member has a first clamping surface along an edge of the window, while the closure member...http://www.google.se/patents/US8100822?utm_source=gb-gplus-sharePatent US8100822 - Anoscope for treating hemorrhoids without the trauma of cutting or the use of an endoscope
