Apparatus and method for expanding bone

A bone expanding method of holding a bone base and a cut-off piece of bone, which is a part of the bone base being cut off therefrom, with a small separation gap from each other, and gradually increasing said separation gap thereby to cause new bone to grow in said separation gap, so that said separation gap is filled with the newly generated bone and expand the bone, the method comprising:

• the step of drilling a prepared hole in the bone base for erecting the support pillar and drilling a prepared hole concentrically therewith in the cut-off piece of bone for passing the support pillar and the adjust screw therethrough, the step of temporarily fitting an alignment assisting pin in said prepared holes and fitting the screw receiving portion of the mounting fixture for fixing the cut-off piece of bone onto said alignment assisting pin thereby to connect and fix the mount bases of the mounting fixture into the cut-off piece of bone with the screw receiving portion of the mounting fixture being centered, the step of removing said alignment assisting pin from the prepared hole and passing the support pillar through the screw receiving portion of said mounting fixture and through the prepared hole of the cut-off piece of bone so as to erect and fix the support pillar in the prepared hole of the bone base, the step of fitting the adjust screw onto the support pillar, that has been erected, from the outside thereof with the support pillar serving as a center axis of rotation and screwing the thread formed on the circumference of the adjust screw into the internal thread of said screw receiving portion, and the step of turning the adjust screw so as to gradually expand the separation gap between the bone base and the cut-off piece of bone.

A bone expanding method of holding a bone base and a cut-off piece of bone, which is a part of the bone base being cut off therefrom, with a small separation gap from each other, and gradually increasing said separation gap thereby to cause new bone to grow in said separation gap, so that said separation gap is filled with the newly generated bone and expand the bone, the method comprising:

• the step of forming a cut-off surface for erecting the support pillar by cutting into the bone at a position adjacent to a predetermined cutting position of the cut-off piece of bone, the step of forming a prepared hole in said cut-off surface for erecting the support pillar and temporarily erecting the support pillar therein, the step of fitting the mounting fixture for fixing the cut-off piece of bone onto the erected pin at the screw receiving portion thereof, putting the mount bases of the mounting fixture on the side face of the bone to be cut off that is adjacent to the cut-off surface for erecting the support pillar and drilling a mount hole in the bone to be cut off with the set screw inserting hole of the mounting fixture, the step of temporarily removing the support pillar and cutting off the cut-off piece of bone at said predetermined cutting position, the step of erecting the support pillar again in the bone base, the step of fitting the adjust screw onto the support pillar, that has been erected, from the outside thereof so as to turn around the support pillar serving as a center axis of rotation, the step of fixing the mount bases of the mounting fixture that has been screwed onto the thread formed on the circumference of the adjust screw into the cut-off piece of bone with the set screw, and the step of turning the adjust screw so as to gradually expand the separation gap between the bone base and the cut-off piece of bone.