The device provides the surgeon with an intermedullary pin for the repair of bone fractures. The pin has a main body or base which is inserted in a drilled out marrow cavity of one-half of the broken bone. A portion of the marrow of the cooperating half of the broken bone is drilled out also to accept...http://www.google.es/patents/US4190044?utm_source=gb-gplus-sharePatente US4190044 - Telescoping intermedullary pin
