In an external fixation device for osteosynthesis, pins inserted into a bone are joined to a support rod by a clamp which leaves the end of the pin free to move in an arcuate direction under load, thus avoiding angulation of the pin in the bone and the resulting stress on the bone....http://www.google.ca/patents/US5024618?utm_source=gb-gplus-sharePatent US5024618 - External fixation device
