Device for postoperative fixation back into the cranium of a plug of bone removed therefrom during a surgical operation

A device for postoperative fixation back into an opening in the cranium of a plug of bone removed therefrom during a surgical operation, wherein the plug is to be repositioned in the opening such that the space between the plug and the surrounding cranial bone is approximately the width of the kerf formed during the surgical operation and the internal and external surfaces of the plug are to be held in alignment with the adjacent internal and external surfaces of the surrounding cranial bone, the device comprising the following elements formed of a physiologically compatible substance:

• a pin having a shaft that is extendable through the space between the plug and the surrounding cranial bone, the shaft having a proximal end and a distal end;
• a substantially rigid first disk mounted centrally on the shaft of the pin at the proximal end, the first disk having an inner surface oriented toward the distal end of shaft and an opposite outer surface, the first disk being positionable interiorly of the opening in the cranium such that the inner surface faces the internal surface of the plug and the adjacent internal surface of the surrounding cranial bone;
• a substantially rigid second disk mounted centrally on the shaft of the pin at the distal end, the second disk having a bore formed therein through which the shaft of the pin extends, an inner surface facing the first disk, and an opposite outer surface, the second disk being positionable exteriorly of the opening in the cranium such that the inner surface faces the external surface of the plug and the adjacent external surface of the surrounding cranial bone, the second disk being movable along the shaft towards the first disk from a first position wherein the first or the second disk is out of engagement with the plug and surrounding cranial bone to a second position wherein the first and second disks engage and align the internal and external surfaces of the plug and surrounding cranial bone;
• and
• means for retaining the second disk in the second position.