Abstract: A needle bearing is designed for a high speed drill or MDA surgical instruments that include alternate rollers made from metallic and plastic or synthetic material mounted in the bore of the housing of the drill or MDA and the shaft being supported by the needle bearing. The inner race, outer race and/or cage may be eliminated from the assembly.

Abstract: A journal bearing for a high speed surgical drill and/or attachment for rotatably supporting a cutter is made from a polymer of polyimide resin and graphite material and is designed to have a polygon configured bore where there are two point contact of the mating surfaces of the bore walls and cutter's shaft and preferably the bore is square shaped in cross section. This bearing results in a decrease in the envelope size of the support tube and hence, the overall diameter of the surgical instrument at the distal end enhances the line of vision of the cutter to the surgeon when the surgeon is performing surgical procedures. The entrance ends of the intermediate bearings are countersunk to define a ramp to ease the egress of the tool bit shaft for entering the tube of the drill motor or drill attachment during the assembly thereof.

Abstract: A needle bearing is designed for a high speed drill or MDA surgical instruments that include alternate rollers made from metallic and plastic or synthetic material mounted in the bore of the housing of the drill or MDA and the shaft being supported by the needle bearing. The inner race, outer race and/or cage may be eliminated from the assembly.

Abstract: A high speed surgical instrument is designed with a clutch that automatically locks a cutter which is easily assembled and disassembled without moving parts. The clutch includes a pin and U-shaped pin that compliments a configured groove section at the proximal end of a cutter that fits into a clutch mechanism in the drill or attachment. The cutter includes axially spaced and opposed grooves judiciously located and a flat end portion that allows easy ingress and egress for locking into the clutch mechanism. A square or multi-sided bore configuration of a journal type bearing made from a high temperature resistance polymer material allows the drill to operate at high speeds with a reduction in the diameter of the distal end of the cutter support.

Abstract: A cutter for a surgical drill and/or attachment includes a configured groove section at the proximal end that fits into a clutch mechanism in the drill or attachment. The distal end portion is flattened at above the center line and extends axially a short distance and defines a shoulder with the outer circumference of the shaft of the cutter. A pair of diametrically grooves disposed downstream of the shoulder toward the distal end are formed on the upper and lower portion of the shaft and are oriented in a horizontal plane passing through the center of the flat portion and include in each of the grooves a pair of predetermined angular grooves displaced from the upper circumferential surface with the apex of the angle being in the horizontal plane and another groove adjacent to and upstream of the shoulder toward the proximate end with a predetermined angle with the apex passing through the horizontal plane.

Abstract: A journal bearing for a high speed surgical drill and/or attachment for rotatably supporting a cutter is made from a polymer of polyimide resin and graphite material and is designed to have a polygon configured bore where there are two point contact of the mating surfaces of the bore walls and cutter's shaft and preferably the bore is square shaped in cross section. This bearing results in a decrease in the envelope size of the support tube and hence, the overall diameter of the surgical instrument at the distal end enhances the line of vision of the cutter to the surgeon when the surgeon is performing surgical procedures. The entrance ends of the intermediate bearings are countersunk to define a ramp to ease the egress of the tool bit shaft for entering the tube of the drill motor or drill attachment during the assembly thereof.

Abstract: A cutter for a surgical drill and/or attachment includes a configured groove section at the proximal end that fits into a clutch mechanism in the drill or attachment. The distal end portion is flattened at above the center line and extends axially a short distance and defines a shoulder with the outer circumference of the shaft of the cutter. A pair of diametrically grooves disposed downstream of the shoulder toward the distal end are formed on the upper and lower portion of the shaft and are oriented in a horizontal plane passing through the center of the flat portion and include in each of the grooves a pair of predetermined angular grooves displaced from the upper circumferential surface with the apex of the angle being in the horizontal plane and another groove adjacent to and upstream of the shoulder toward the proximate end with a predetermined angle with the apex passing through the horizontal plane.