Abstract: A powered bone cutting saw is used from within the intramedullary canal of a bone. A cutting blade is inserted through a bored intramedullary canal to a predetermined cutting depth. A motor is coupled to the cutting blade to rotate the cutting blade. The blade is extended to a cutting position and operated by a surgeon to cut the bone radially from the inside outwardly, transversely, to the intramedullary canal. Gearing selectable by the surgeon permits the blade to oscillate. The motor can also be coupled to a reamer tip for boring the intramedullary canal. The apparatus, including the reamer tip, can be cannulated to accept a guide wire.

Abstract: A device for lengthening bone in a human or animal by incrementally extending the distance between discrete separated portions of the bone to permit continued bone growth between the separated portions comprising an intramedullary nail having distal and proximal portions both of which are secured within the medullar canal of the bone. A hydraulic cylinder is connected to the proximal portion and a piston is connected to the distal portion of the nail. An implantable supply of operating fluid communicates with the cylinder and ratcheting mechanism, between the piston and cylinder, limit their relative movement. A shock absorber mechanism permits limited lost motion between the piston and cylinder and ratcheting release means are employed to permit the piston and cylinder to reverse directions. Various interchangeable distal tips are disclosed to accommodate not only different bones but differently shaped medullar canals.

Abstract: A device for lengthening bone in an human or animal by incrementally extending the distance between discrete separated portions of the bone to permit continued bone growth between the separated portions comprising an intramedullary nail having distal and proximal portions both of which are secured with the medullar canal of the bone. A hydraulic cylinder comprises the proximal portion of the nail and a piston comprises the distal portion of the nail. An implantable supply of operating fluid communicates with the cylinder. A ratcheting mechanism, between the piston and cylinder, limits their relative movement. A shock absorber mechanism permits limited lost motion between the piston and cylinder and ratcheting release mechanisms are employed to permit the piston and cylinder to reverse directions.