A powered handpiece for driving a surgical blade to cut anatomical tissue includes a reusable handpiece body having a distal end for being coupled with a surgical blade, a drive shaft in the handpiece body for rotatably driving the surgical blade, a motor assembly for being installed in the handpiece...http://www.google.es/patents/US5957945?utm_source=gb-gplus-sharePatente US5957945 - Powered handpiece system
