Abstract: An implant and method for replacement of the proximal portion of a femur, and specifically for replacement of the natural femoral head is provided. The implant includes a body member for insertion, in use, through the natural femoral neck and in substantial alignment therewith; a head member with a spherical portion for engagement with a natural or a prosthetic hip socket; a joining portion for joining the head member to the body member; and a rod for insertion, in use, through the transverse passage of the body member. The rod is designed such that it has a cross-sectional configuration that contacts the cortical surfaces in the bone and inhibits micro-motion within the bone. In addition, the transverse passage of the body member is configured to complement the configuration of the rod such that the need for stabilizing screws toward the distal end of the rod is eliminated when the implant is assembled within the patient.

Abstract: A bone prosthesis is provided which includes an implantable elongate stem member having a bore extending therethrough. The stem member has a proximal end and a distal end with at least one slot formed in the distal end. The slot extends along at least a portion of the stem member, in a longitudinal direction, from the distal end towards the proximal end to form at least two tines at the distal end of the stem. A bolt member is disposed within the bore of the stem member and has a proximal end and a distal end, wherein at least a portion of the bolt member proximate the distal end is threaded. An expander nut is disposed between the tines and is threadably matable with the distal end of the bolt member such that rotation of the bolt member in a first direction is effective to draw the expander nut towards the proximal end of the stem member to separate the tines at the distal end of the stem member.

Abstract: Surface irregularities are removed from the inner wall of a femur cavity, preferably tapered. A tamp having an opening and a socket is disposed in the cavity. The tamp may be one of a plurality of tamps each having a different length for the opening. A guide, one of a plurality, fits snugly in the opening. The guide has a collar which cooperates with the tamp socket to limit the movement of the guide into the tamp. A working portion of each guide below the intermediate position has a bulbous shape which is tapered in accordance with the femur taper. Bone fragments between the guide working portion and the femur inner wall are packed against the inner wall when the tamp and the guide are driven into the femur cavity. Numerals on the guide adjacent a slot in the tamp indicate the disposition of the guide in the tamp.

Abstract: An intramedullary support strut for a long bone for a range of different applications including anchoring and fixation. The strut is in the form of nested telescopic members. In the retracted configuration, the strut is compact and may be inserted into position aligned with a shaft made in the medullary canal via a portal made in the lateral cortex of the bone. The strut may then be telescopically extended into the medullary canal to provide the required support.

Abstract: The invention relates to a uncemented prosthesis having a tension anchor embodied as a thrust rod that is solely anchored internally in the femural neck by means of a conically axial tension anchor in the dorsolateral corticalis. The femural neck is completely preserved in this prosthesis.

Abstract: A prosthetic implant that contains a stem integrally connected to a neck, a head that sits on top of the neck, and a porous assembly disposed around them stem. The porous assembly contains a first porous tube and a second porous tube, wherein the second porous tube is disposed within the first porous tube, and the stem is disposed within the second porous tube. The porous assembly is a heat absorbent porous assembly which tends to maintain its temperature within a specified range.

Abstract: A joint prosthesis comprising at least a first and a second load carrying member, the first load carrying member being substantially more shock absorbing and resilient than the second load carrying member.

Abstract: An implant and method for replacement of the proximal portion of a femur, and specifically for replacement of the natural femoral head is provided. The implant includes a body member for insertion, in use, through the natural femoral neck and in substantial alignment therewith; a head member with a spherical portion for engagement with a natural or a prosthetic hip socket; a joining portion for joining the head member to the body member; and a rod for insertion, in use, through the transverse passage of the body member. The rod is designed such that it has a cross-sectional configuration that contacts the cortical surfaces in the bone and inhibits micro-motion within the bone. In addition, the transverse passage of the body member is configured to complement the configuration of the rod such that the need for stabilizing screws toward the distal end of the rod is eliminated when the implant is assembled within the patient.

Abstract: Apparatus and methods are disposed for maintaining the proper positioning of a prosthetic implant having proximal and distal ends within a prepared bone cavity during cement injection and curing. First stabilization means, implantable within the bone cavity, minimize lateral movement of the distal end of the implant, while second stabilization means, physically separate from the means for minimizing lateral movement of the distal end of the implant, minimize both the lateral movement of the proximal end of the implant and the rotational movement of the implant overall. In the preferred embodiment, the second stabilization means includes an apertured cap removably securable to the end of a bone having the prepared cavity through which the implant is inserted and held in place.

Abstract: This invention provides a method and means for securing a tissue to a bone or non-tissue prosthesis by affixing a collagenous material to said bone or non-tissue prosthesis, and affixing said tissue to said collagenous material.

Abstract: A femoral neck endoprosthesis for an artificial hip joint, having an adapter for accommodating the joint ball, a support ring for guiding the adapter on the proximal side of the femur, and a support bearing for guiding the adapter on the lateral side of the femur. The aim of the invention is to increase the strength of the bone tissue for a prosthesis. To this end, the prosthesis is configured in such a way that the adapter is provided with a support shoulder and with a shaft which penetrates the femur approximately along the extended axis of the femoral neck. The support ring is mounted on the proximal side of the femur only with its support surface. An axial stop for the support shoulder and a bore for the shaft are arranged on the support ring for guiding the adapter. The bore is laterally offset in relation to the support surface. The support bearing is fixed only on the lateral side of the femur and the guide bore for the shaft can be aligned with the axis of the adapter.

Abstract: The invention relates to a shaft prosthesis having a modular system that is anchored in the proximal cement cavity by means of a conically axial tension anchor. The stem segments and base segments may be of various lengths.

Abstract: An implant is formed of an expandable material. An opening is formed in a bone in a patient's body. At least a portion of the implant is positioned in the opening in the bone in the patient's body. The implant is retained against movement relative to the bone in the patient's body by absorbing body fluid with the implant and expanding the implant while the implant is disposed in the opening in the bone in the patient's body. The implant may be a hip replacement member.

Abstract: A bone prosthesis is provided which includes an implantable elongate stem member having a bore extending therethrough. The stem member has a proximal end and a distal end with at least one slot formed in the distal end. The slot extends along at least a portion of the stem member, in a longitudinal direction, from the distal end towards the proximal end to form at least two tines at the distal end of the stem. A bolt member is disposed within the bore of the stem member and has a proximal end and a distal end, wherein at least a portion of the bolt member proximate the distal end is threaded. An expander nut is disposed between the tines and is threadably matable with the distal end of the bolt member such that rotation of the bolt member in a first direction is effective to draw the expander nut towards the proximal end of the stem member to separate the tines at the distal end of the stem member.

Abstract: A prosthetic part includes an anchorage section that is introducable into a bone recess, the anchorage section comprising at least partially a cage structure, a plate section that extends in a lateral direction beyond the anchorage section, and a supporting section for a joint part. The plate section is provided with at least one opening or at least one indentation, through which a severing instrument is introducable to cut a connection between the anchoring section and corticalis substance of a bone. The plate section has a marginal region having a circumferential arrangement of indentations, and the at least one opening or the at least one indentation is elongated and extends parallel to an edge of the plate section.

Abstract: Apparatus and method are disclosed for maintaining the proper positioning of an implant (310, 504) within a prepared bone cavity (312) during cement injection and curing. First stabilization means (340, 480), implantable within the bone cavity, minimize lateral movement of the implant distal end, while second stabilization means (330, 334, 406, 404), physically separate from the first stabilization means (340, 480), minimize both the lateral movement of the implant proximal end and the rotational movement of the implant overall. In the preferred embodiment, the second stabilization means (330, 334) includes an aperture cap (334) removable securable to the end of a prepared bone. This cap (334), preferably further includes first and second ports (322, 336) associated, respectively, with cement injection and cement over-pressurization.

Abstract: An improved method for reinforcing a prosthetic implant and an implant product are provided. The method includes embedding a support structure in a bed of bone cement surrounding the distal end of a prosthetic device. The support structure counteracts hoop-stress imparted to the implant, decreases creep of the bone cement, and further reinforces the bone cement bed. In various embodiments, the support structure can be in the form of a metal coil, in the shape of a wire mesh, or in the design of a coil reinforced centralizer. Prior to being implanted, the support structure can be precoated with bone cement or can be prefabricated with a prosthetic device.

Abstract: The present invention provides a femoral prosthesis to be utilized as an implant into a human femur to connect the coxa. The femoral prosthesis comprises a stem body to be inserted into a femur bone, a neck portion fixed integrally at the proximal portion of the stem body, a spherical head member having an opening to receive the neck potion, and a cross pin for fixing the stem body to the femur bone, wherein the stem body is formed with a pinnig hole through a proximal portion thereof corresponding to a greater trochanter of the femur bone, and the cross pin is in a unthreaded cylindrical shape and inserted into the pinning hole, both ends of the cross pin being projected out of the stem body to be engaged with the bone wall of the femur bone.