A guiding pocket for driving staples is described, in which a first set of parallel sides helps form the opening for the guiding pockets. These parallel sides are connected to tapered sides, which are in turn connected to a second pair of parallel sides, creating a hexagonal shaped pocket. The resultant...http://www.google.com/patents/US4805823?utm_source=gb-gplus-sharePatent US4805823 - Pocket configuration for internal organ staplers
