A knife having a handle into which a knife blade may be inserted. The blade end of the handle is of reduced diameter and contains a pair of spring-like cantilevered locking arms. The locking arms terminate in a clasping mechanism that interact with a latch contained within a bore in a sheath. The bore...http://www.google.es/patents/US6569175?utm_source=gb-gplus-sharePatente US6569175 - Surgical knife
