Abstract: A prosthesis includes an elongated shaft terminating in a proximal end and a distal end. The shaft has a center axis and an outer surface provided with grooves having side walls forming an essentially wedge-shaped cross section terminating in a bottom edge line. The grooves extend substantially longitudinally on the outer surface from the proximal end to the distal end in a substantially uniform density. The bottom edge lines are oriented toward the center axis, whereby a separate imaginary plane longitudinally dividing each groove contains both the center axis and the respective bottom edge line. The number of grooves in an imaginary angular sector, having a vertex line coinciding with the center axis, increases with increasing distance of the outer surface from the center axis. The proximal end has an enlarged surface region and the grooves extend from the distal end upward toward the enlarged surface region.

Abstract: A device which includes an elongated rod made of a metal having a generally silver color and having a threaded end and a component having an internal thread which engages the end of the rod. The threaded end portion has a borderline where a region coated with titanium nitride borders an uncoated region of the rod.

Abstract: A marrow nail for use in a marrow cavity nailing procedure for the treatment of bone fractures, including a tubular, carbon fiber reinforced plastic nail body having a tip which has a distal end, the nail body being elongated and being curved along its length, and the tip having a conically tapered outer surface which is ground and which tapers toward the distal end.

Abstract: An intervertebral disk endoprosthesis is filled with an elastic material and provided with cover plates at its end faces, and has a circular or elliptical corrugated tube surrounding the viscoelastic material, the tube being terminated by cover plates.

Abstract: A marrow nail for the treatment of bone fractures, including a marrow nail body having a hollow tubular cross section, the marrow nail body having a constricted marrow nail head, and a marrow nail tool for driving in, extracting and changing the position of the marrow nail during repositioning of a constricted marrow nail head. The marrow nail tool includes two generally parallel gripper jaws which are pivotable relative to one another, each of the two gripper jaws having a respective distal end which extends toward the other one respective distal end, a generally rectangular mandrel disposed between the two gripper jaws, and a securing ring which can be moved into a position encircling the two gripper jaws.

Abstract: An endoprosthesis is equipped with a collar and a prosthesis shaft and is adapted to be anchored longitudinally in a bone without the use of cement. A hip endoprosthesis can be constructed for anchorage in the proximal femur, in which the prosthesis shaft is composed of a plurality of parallel interconnected thin plates which are configured as plate-shaped partial faces and which have peripheral cutting edges which face away from the prosthesis collar. A tibial plateau prosthesis can be similary constructed, and includes a tibial plateau and a supporting structure formed of thin plates which extend in a common direction and which are interconnected. Both types of prosthesis can be driven into the bone without destruction of existing bone tissue and without removal of spongiosa.

Abstract: Acetrabular cup as part of a hip joint prosthesis is composed of an outer support ring and a plastic inner socket insertable into the support ring. The acetabular cup includes a covering cap provided with at least one metal surface which covers the part of the inner socket not surrounded by the support ring and whose metal outer contour supplements the socket to give it the spherical shape of an essentially closed hemisphere or spherical cap.

Abstract: A slotted slide plate assembly for setting bones in a fracture area and exerting a pressure in a predetermined direction to obtain a bone compression includes a first plate element adapted for a face-to-face engagement with a bone surface; a second plate element adapted for a face-to-face engagement with the topside of the first plate element; a securing device which prevents a relative displacement between the first and second plate elements when they are in a face-to-face engagement with one another; and first and second slide slots provided in the first and second plate elements, respectively, and being oriented parallel to the predetermined direction. The two slide slots are overlapping when the two plate elements engage one another. Each slide slot has sloping slide ramps arranged such that the slide ramp in the first plate element is a continuation of the slide ramp in the second plate element.

Abstract: An implantable fixation device comprises a support bar (1) having right-hand threads on the one end and left-hand threads on the opposite end, and having jaw supports (5, 6) threadingly mounted on the respective threaded ends. The jaw supports have secured thereto bolt jaws by means of a respective clamping screw (7), which bolt jaws are (adapted to be) fixed to intact vertebral bodies of the spiral column by means of bone (screw) bolts (13). Further, the bolt jaws are provided with receiving holes (16) permitting the insertion of rod-shaped repositioning instruments (17). By means of this structure, setting of the vertebral elements or segments is possible irrespective of the length of the bone bolts. The repositioning rods (17) can be easily removed; subsequent shortening of the bone bolts (17) is not necessary.

Abstract: A hip joint prosthesis includes a first member having a shaft portion and a lateral arm extending toward a joint, the lateral arm being sloped in the direction of the joint and being adapted to receive a joint ball. The lateral arm has significantly greater length in a region adjacent the shaft and measured therealong than its corresponding thickness. A second member can be pushed onto the shaft portion supporting the lateral arm. This second member receives a distal end of the first member, with the second member essentially completely receiving the shaft portion supporting the lateral arm. The first member is joined at its proximal end to a proximal end of the second member. The lateral arm extends through a slit portion in the second member such that the region of the lateral arm adjacent the shaft portion is disposed within the slit portion.

Abstract: A modular assembly for a shaft prosthesis having a head part and an end part, of which one part has a conical protrusion and the other part has a conical bore, wherein between these two parts at least one intermediate part adapted to the protrusion and/or bore is provided, wherein the head part (1) and/or at least one intermediate part (5) has a through bore (16) and the end part (9) or an intermediate part (5) has a bore (17 or 18 ) having means (20) for releasable engagement for the sake of transmitting a force in the axial direction wherein when the parts (1, 5 and/or 9) have been joined the bores (16-18) are axially aligned with respect to one another in the direction of the shaft, and a tension rod (15) is provided with and is connectable with an engagement element for releasable engagement, and when the prosthesis parts have been joined together projects beyond the head part (1) at least when the head and end parts have been joined together.

Abstract: A bone implant, in particular as a shaft-type prosthesis, which has a mirror-symmetrical shape is proposed, wherein for adaptation to bone regions of the left or right half of the body that in themselves are not mirror-symmetrical, the part having mirror-symmetrical shape forms a basic element, and a separately shaped additional element is provided that is joined or can be joined to the basic element in such a manner that a bone implant that is not mirror-symmetrical and is usable only on the left or right side of the body is produced.

Abstract: Drill system for an endoprosthesis including a drill gauge composed of: a straight, stem-like shaft and a guide element provided with a through bore for a drill, the guide element being connected with the stem-like shaft and the bore being oriented at an angle with respect to the shaft. The axes of shaft and bore essentially intersect and the guide element is fixed to the cylindrical, stem-like shaft.

Abstract: Implant provided with a conical connection and means for releasing an element placed on the cone surface, particularly a joint ball, wherein the cone is provided with a longitudinal bore which opens into a transversely oriented opening, extends laterally to the outer surface, and is provided with a contact face facing the cone connection. A pin is provided which is displaceable in the longitudinal bore and, beginning at the front face of the cone, extends into the transversely oriented opening.

Abstract: Implant composed of a first part having a receptacle; a second part having a pin projecting therefrom, the pin having a conical portion located at the free end of the pin and tapering toward the free end of the pin, the conical portion being insertable into the receptacle to connect the parts together, the pin further having a threaded portion axially spaced from the conical portion; and a nut threadedly engaging the threaded portion for movement toward the first part in a manner to force the first and second parts apart.

Abstract: A resection prosthesis assembly unit including a head member, an end member and an intermediate member between the head and end members, of which one member is provided with a conical pin and another member is provided with a conical bore, with the latter two members being provided with respective first surfaces which extend transversely to an insertion direction and which face one another and are spaced apart to define a recess when the two members are connected together, one of the two members being further provided with a second surface extending in the insertion direction, and the recess being provided to receive a wedge insertable into the recess to bear against the first surfaces for forcing the two members apart while the forces exerted by the wedge are absorbed by the first surfaces and the wedge is guided by the second surface.

Abstract: A shaft for a collarless hip joint prosthesis, the shaft having a proximal end formed to support a joint head and a distal end formed to be inserted into a bone channel, the shaft being formed to exhibit a change in the direction of its longitudinal axis in the direction of a selected plane and in a region in the vicinity of its proximal end, and having a rounded cross section presenting a reduced cross-sectional dimension in the direction perpendicular to the selected plane, the shaft having a shoulder located in the region in the vicinity of the proximal end, projecting from the selected plane, and merging in the direction of the longitudinal axis of the shaft into regions having such reduced dimension.

Abstract: In a hip joint prosthesis having an elongated hollow shaft, a neck portion, a ball joint connected to the neck portion and a detachable mounting ring coupling the shaft to the neck portion; and wherein the shaft is provided with local sections of weakened material, the material is adapted, with respect to its deformation characteristics, to those of the surrounding bone region and the adaptation of the longitudinal rigidity and/or resistance to bending of the shaft is effected by the targeted provision of sections of weakened material.

Abstract: A compression nail assembly for engagement with an element fixed to a bone for placing bone parts on either side of a fracture in compression. The assembly includes a tightening sleeve and a tightening mandrel configured for insertion into the sleeve and having an end portion shaped in the form of a hook for engagement with the element.

Abstract: A joint prosthesis for insertion in a bone cavity comprises an adapter; a hollow, flexible prepreg member of hardenable material secured to the adapter; a hollow inflatable pressing member disposed in the prepreg member; and an arrangement for introducing fluid into the pressing member for inflating the same for causing the prepreg member to conform to the walls of the bone cavity.