The invention provides a surgical implant in the form of a stud for anchoring in a hole formed in bone. The stud has an elongated cylindrical body which is tubular and which has a head at one end and a passage along its interior. A pin is insertable into the passage from the end having the head to expand...http://www.google.ca/patents/US4590928?utm_source=gb-gplus-sharePatent US4590928 - Surgical implant
