| 摘要 |
A fixation pin adapted for use with a frame assembly for the external fixation of a bone. The fixation pin includes a metallic pin having a bioabsorbable threaded tip attached thereto. The metallic pin is a shaft having a proximal end and a shaped distal end. The bioabsorbable tip is a cylindrical unitary body having a distal end, a proximal end and a threaded outer surface therebetween. The proximal end of the tip is affixed to the shaped distal end of the metallic pin. To implant the fixation pin, a hole is drilled and tapped in a first or second bone segment comprising a fracture site. The bioabsorbable tip of the fixation pin is inserted into the hole and the fixation pin is rotated until the threaded outer surface of the tip is embedded within the bone. The proximal end of the metallic pin, projecting outwardly from the skin, is attached to a rigid frame by a clamp. Additional fixation pins are similarly implanted and attached to the frame thereby stabilizing the relative position of the first and second bone segments and accelerating healing of the fracture. During the healing process, the bioabsorbable thread loses its structural integrity due to degradation. After healing, the fixation pins are removed from the bone by applying traction to the proximal end of the fixation pins. In the event that the structural integrity of the bioabsorbable threads remains partially intact, the fixation pin can be removed by unscrewing the pin from the bone. The hybrid construction of the fixation pin minimizes trauma to both the bone and surrounding tissue during percutaneous removal of the fixation pin.
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