Abstract: The invention provides a cutter head that reduces the cutting force and number of reamers required by increasing the depth of cut or cutting length. The cutting head uses at least one tooth placed along the length of flutes formed within the body of the cutting head. The grooves forming the flutes can follow a first helical path along the body length, maintaining a substantially constant path over a major portion of the entire length in relation to the axes or, alternatively, have a constantly changing path. A second pattern can follow a second, contiguous helical path that has a second radial orientation to the axis. The teeth can be formed from a sinusoidal wave form comprised of a continuous radius going from convex to concave, with each of the teeth having a predetermined pitch from the crest to the base. In another embodiment the crest of the teeth on the first flute is offset axially by a predetermined distance from the teeth on the adjacent flutes.

Abstract: A method of securing an implant into a bone using a targeting device having at least two magnetic field communication units are disclosed. The device consists of at least a receiver and transmitter for multi-axis pulsed direct current magnetic signals in each of three orthogonal planes. One of the communication units carried in a fixed position by a drill guide and a second of the communication units is in a fixed, offset position relative to an implant connector. The position and orientation of the drill guide relative to the implant connector is determined by the transmission of the pulsed direct current magnetic signal from the transmitting unit and receiving that signal at the receiver. The signals provide the position and location of the communication units in relation to one another. The signals are converted into position and orientation data format readable by a programmed computer.

Abstract: An improved flexible shaft used in the reaming of the medullary space in bones is described. The shaft is comprised of a solid element with a longitudinal bore the entire length and an appropriately formed slot which extends spirally around the shaft either continuously or segmentally. Attached to the shaft's opposite ends respectively, are a cutting head and a means of connecting the shaft to a driving mechanism.

Abstract: An awl for providing entry into and subsequent penetration of a bone is disclosed. The awl features a first section which is straight and has a first end, an exterior end, and a cutting tip at its exterior end. The second section of the awl is a connection region which has a first end and a second end. The first end of the second section extends essentially normal from the first end of the first section. The third section provides an external reference for the direction of the cutting tip and extends from the second end of the second section in a direction essentially parallel to the first section, such that the oriention of the third section represents the orientation of the first section.

Abstract: A fracture alignment and retention device includes a plurality of spanning bars which are spaced about the extremity of the patient having a fractured long bone. Preferably, the spanning bars are located circumferentially about the extremity. At least three spanning bars are held in approximately 90 degree offset positions with respect to each other by two straps encircling the extremity. The straps are secured in place by a VELCRO-type fastener or other securing devices. Each spanning bar includes at least two pressure pads which are placed on the extremity on opposite sides of the fracture. Each pressure pad includes a threaded shaft which is threadably mounted at a central portion in a fixed bushing engaged in a slot defined in an uppermost surface of the spanning bar. One end of the shaft includes a knob and the opposite end is mounted on the pressure pad for causing movement of the pressure pad toward or away from the extremity in an axial direction along the shaft without rotation of the pressure pad.

Abstract: An intramedullary rod system includes a guide rod and a tubular hollow intramedullary rod having an interior surface shaped, at least in a portion, complementary to that of the guide rod. The guide rod is first inserted through the medullary canal and then removed after sliding the tubular intramedullary rod over the guide rod. The guide rod is then aligned outside of the leg parallel to the hollow intramedullary rod for engagement at a distal end by bifurcated prongs with a drill bolt with which bifurcated prongs of the hollow intramedullary rod is simultaneously engaged. Screw holes are thereby aligned between the guide rod and the intramedullary rod at the distal end of the bone without the use of targeting. The hollow intramedullary rod is aligned with the guide rod by a lateral guide for accurate insertion through the guide rod of screws at the distal end of the hollow intramedullary rod.