Abstract: For the application of bone cement, the cement must be ejected with maximum uniformity. The proposed device comprises a cylinder (10) including a distal ejection nozzle (11), said cylinder with its proximal end (12) being adapted for mounting on a displacing unit (20) for displacing a piston (13). The displacing unit (20) comprises gear means (21, 22) for converting the rotary movement of a driving journal (23) into the linear displacing movement of a driven plunger (14). The piston (13) is adapted to be connected with the driven plunger (14). In the vicinity of the driving journal (23) the displacing unit (20) comprises adapter means (30) for detachable assembly with a pneumatic drilling machine (40).

Abstract: A method and apparatus for the fixation of osteoporotic bones and especially vertebral body compression fractures, Colles' fractures and fractures of the proximal humerus. The method of the present invention includes a series of steps including penetrating the bone having the fracture with a guide pin, drilling the osteoporotic bone marrow of the bone to enlarge the cavity to be treated, following which a bone specific inflatable device is inserted in the cavity and inflated. The expansion of the device causes a compacting of the osteoporotic bone marrow against the inner surface of the outer wall of the bone to be treated to further enlarge the cavity. When this occurs, a flowable synthetic bone material or methyl methacrylate cement is directed into the cavity and allowed to set to a hardened condition. Following this, the instruments are removed.

Abstract: The invention relates to an evacuatable bone cement syringe comprising a container (8) for receiving the bone cement prior to its application, and comprising a pressure generating apparatus for precompressing the bone cement in the container (8). A bell (100) comprising a vacuum tube (110) is placed over the container (8) and held in place by a flange (105) so that the gases which escape during the process of precompression can be sucked off. In this way it is possible to reduce the porosity of the bone cement which is being applied.

Abstract: A proximal femoral sealing device is disclosed for use in the application of bone cement under pressure to a surgically prepared medullary canal of a femur prior to the implantation of a hip prostesis. The proximal femoral sealing device is formed of a generally solid body member with a passageway and a flexible annular wall member extending from the body member. The sealing device has an anatomically shaped outer surface, corresponding to the exposed endosteal surface of a prepared medullary canal. A chamber defined by a flexible annular wall and the body member opens into the medullary canal. In turn, the passageway communicates with the chamber and permits insertion of a cement nozzle therethrough into the chamber. In operation, the proximal femoral sealing device is placed within the proximal end of a surgically prepared medullary canal.

Abstract: An improved surgical procedure for orthopedic implantation of a prosthesis where the conventional metal prosthesis is provided with an integral collar of a bone cement compatible polymer coating of a desired thickness and shape. The collar thickness serves to operably effect a seal with the bone so the prosthesis becomes a pressurizing plunger during the last phase of inserting the prosthesis into the bone opening or cavity. A slowly developing pressure build up of the viscous bone cement provided by the tapered shape of the collar thickness assures bone cement flow into all bone crevices and minimizes bone cement porosity by reducing the size of the voids formed by entrapped air during curing of the bone cement. The preformed collar also provides a predetermined thickness or layer of bone cement at the critical structural locations in order to ensure the surgeon of optimum physical characteristics of the bone cement at that location and avoid direct contact of the metal prosthesis with the bone.