Method of and apparatus for forming a crescentic joint in a bone
OwnerRobert E. Weinstockinventor
Life of this patent
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Abstract
As part of the process of realigning the distal ends of a bone having an intermediate section of width W, an arcuate osteotomy is performed on the intermediate section using a cutter having an arcuate cutting edge of a diameter slightly greater than W and an arcuate extent of 180.degree.-N.degree.. The blade is oscillated through an arc of approximately N.degree. to form a crescentic joint having a maximum bearing area.
Claims8
A saw adapted to form a crescentic joint in a bone at a section having a width W, comprising:
- a blade having a circular base section of a diameter slightly greater than W, an arcuate cutting end of the same diameter, the end having a serrated edge forming an arc of approximately 180.degree.-N.degree. formed on a circular semi-tubular section having the same arc, the other end of the semi-tubular section being connected to an intermediate tubular section that fairs out in arcuate extent from a full circle at the base to the semi-tubular section;
- a bit affixed centrally to the base and projecting therefrom axially in a direction opposite to the cutting end;
- and a rotationally oscillating drive adapted to receive the bit and oscillate through an arc of substantially N.degree., whereby the saw is adapted to form a crescentic osteotomy having a bearing surface of approximately 180.degree..
A saw blade adapted to be used with a rotationally oscillating drive which oscillates through an arc of substantially N.degree., to form a crescentic joint in a bone at a section having a width W, comprising:
- a circular base section of a diameter slightly greater than W;
- an arcuate cutting end of the same diameter, the end having a serrated edge forming an arc of approximately 180.degree.-N.degree. and being formed on a circular semi-tubular section of appreciable longitudinal extent and of the same arc;
- and an intermediate tubular section connecting the semi-tubular section and to the base that fairs in arcuate extent from a full circle at the base;
- and a shank affixed centrally to the base and projecting therefrom axially in a direction oppoite to the cutting end.
The method of performing an arcuate osteotomy in a bone section having a width W, comprising:
- sawing the bone section with a right, circular, cylindrical tubular blade having a diameter slightly greater than W and an arcuate cutting end formed on the same diameter and having an arcuate extent of substantially 180.degree.-N.degree., by rotationally oscillating the blade through an arc of N.degree..
Dependencies are inferred from the claim text.