An occluder pin (10) has a cap (14) and shaft (16) with a plurality of serrations (18) disposed along the shaft (16). The serrations have a beveled trailing surface (20) which facilitates easy insertion of the pin in a substantially perpendicular leading surface which provides for resisting withdrawal...http://www.google.com/patents/US5464421?utm_source=gb-gplus-sharePatent US5464421 - Hemorrhage occluder, applicator and method
