Abstract: A surgical instrument formed by a handpiece assembly and a removable tool assembly. The handpiece assembly includes a housing having integrally interconnected grip and nose portions which are of tubular construction and are positionally related so that the longitudinal direction of the nose portion extends at an angle of 40.degree. with respect to the longitudinal direction of the grip portion. The grip portion contains first and second removable cartridge units, with one cartridge unit containing a motor and the other cartridge unit containing a speed reducer. The tool assembly includes an elongated rotatable tool which is axially confined by and rotatably supported on an elongated support sleeve. The rearward end of the support sleeve is connectible to the front end of the nose portion by a bayonet-type coupling, which also permits the rearward end of the tool to be nonrotatably coupled to a drive shaft rotatably supported in the nose portion.

Abstract: A blade for a surgical saw having a handpiece, a chuck and drive means for reciprocating the chuck in an axial direction. The blade is long, relatively thin and has an integral ridge on one side thereof extending lengthwise thereof. The ridge is intermediate of and spaced from the lengthwise edges of the blade. The ridge is on one side only of the blade. A shank is secured to one end of the blade for engagement by the chuck.