42 results about "Acetabular shell" patented technology

An acetabular shell liner having a variable rim surface geometry, which improves range of motion of the femoral component within the liner and decreases the incidence of dislocation and subluxation, and methods of making and using the acetabular shell liner. Prosthetic devices, more particularly hip joint prostheses, containing the acetabular shell liner having a variable rim surface geometry are also provided.

There is provided an acetabular shell liner, and particularly a constrained liner, having a variable rim surface geometry to improve the range of motion of a femoral component within the liner and decrease the incidence of dislocation and subluxation. There are also provided methods of making and using the acetabular shell liner. Prosthetic devices, and particularly hip joint prostheses, containing the acetabular shell liner having a variable rim surface geometry are also provided.

The invention is directed to an instrument for use in minimally invasive hip surgery. In particular, the instrument is useful for both alignment and insertion / impaction of an acetabular shell. Furthermore, the instrument is suitable for assuring the shell is impacted with the proper abduction and version in left or right hips.

An orthopedic component having multiple layers that are selected to provide an overall modulus that is substantially lower than the modulus of known orthopedic components to more closely approximate the modulus of the bone into which the orthopedic component is implanted. In one exemplary embodiment, the orthopedic component is an acetabular shell. For example, the acetabular shell may include an outer layer configured for securement to the natural acetabulum of a patient and an inner layer configured to receive an acetabular liner. The head of a femoral prosthesis articulates against the acetabular liner to replicate the function of a natural hip joint. Alternatively, the inner layer of the acetabular shell may act as an integral acetabular liner against which the head of the femoral prosthesis articulates.

An anchor for securing an implant within bone. In one embodiment, the anchor is used to aid in securing an acetabular cup within an acetabulum. The anchor may be implanted within an ischial defect of the pelvis, and is attached to an outer surface of the acetabular cup shell. The anchor is made at least in part of, and may be made entirely of, a porous metal material to facilitate the ingrowth of surrounding bone into the anchor for osseointegrating the anchor into the surrounding bone. The anchor may be secured to the acetabular shell by a screw fastener or by cement, for example. The anchor may be secured to the acetabular shell before the anchor and the acetabular shell are together implanted into the acetabulum, or the anchor may be implanted into the ischial defect, followed by seating the acetabular shell in the acetabulum and then securing the acetabular shell to the anchor.

An acetabular shell or cup removal instrument is disclosed. The instrument includes a first end capable of being received within an acetabular cup and a cutting element pivotally attached. Cutting motion is provided to the instrument by a powered handpiece, so that the cutting element is capable of cutting a bone surface adjacent to an outer surface of the acetabular cup when the first end is within the acetabular cup.

An acetabular cup assembly for a prosthetic hip joint includes an outer shell for attachment to the acetabulum. The outer shell has an inner surface receiving a bearing insert portion. Complimentary coupling features are provided on the inner surface of the outer shell and the outer surface of the bearing insert for coupling the bearing insert to the outer shell. A plurality of adaptors are provided having an outer surface for engaging an inner surface of the outer shell and having an inner surface for receiving the bearing insert. Each adaptor has at least one radial extending strap or flange for engaging the bone surrounding the acetabulum. The straps or flanges may be of different sizes and shapes and may be at different locations on the adapter. The inner surface of the adaptor includes the same coupling features as the shell so as to be able to receive a bearing insert.

A tool for separating an acetabular shell of a hip prosthesis from the surrounding pelvic bone includes a fixture which attaches to the acetabular shell and has a chisel guide mounted on it. A chisel associated with the chisel guide is curved to conform to the outer periphery of the acetabular shell, and the chisel guide causes the chisel to circumscribe the acetabular shell as the chisel is inserted between the acetabular shell and the pelvis.

There is provided an acetabular shell liner, and particularly a constrained liner, having a variable rim surface geometry to improve the range of motion of a femoral component within the liner and decrease the incidence of dislocation and subluxation. There are also provided methods of making and using the acetabular shell liner. Prosthetic devices, and particularly hip joint prostheses, containing the acetabular shell liner having a variable rim surface geometry are also provided.

A method and apparatus for performing minimally invasive hip surgery to implant an acetabular shell into the acetabulum. A collapsible acetabular reamer is moveable between an expanded position and a collapsed position. In the expanded position, the reamer reams the acetabulum. In the collapsed position, the reamer can fit through a small minimally invasive incision.

A method and apparatus for implanting acetabular components into an acetabulum utilizing a minimally invasive incision. The method and apparatus utilize a subatmospheric pressure formed in a hollow passage of an elongate body to secure an acetabular shell to a shell-engaging head removably attached to a coupler end of the elongate body. Liner-engaging heads may also be removably attached to the coupler end to install socket liners into an implanted acetabular shell. The elongate body may comprise a bent portion to allow access to the acetabulum through a minimally invasive incision.

A tool for separating an acetabular shell of a hip prosthesis from the surrounding pelvic bone includes a fixture which attaches to the acetabular shell and has a chisel guide mounted on it. A chisel associated with the chisel guide is curved to conform to the outer periphery of the acetabular shell, and the chisel guide causes the chisel to circumscribe the acetabular shell as the chisel is inserted between the acetabular shell and the pelvis.

A dual mobility femoral head construct has a secure acetabular shell received within an acetabular recess formed in a pelvis. An implantable prosthetic device is implantable after a failure of an originally installed articular head insert of an acetabular cup assembly. A hemispherical liner is formed from a cast cobalt-chromium alloy for thinness and elasticity. At least three spacers are annularly displaced about an outer diameter of the hemispherical liner to define a uniform cement thickness with the secure acetabular shell. Web shaped depressions are formed circumferentially in the outer diameter of the hemispherical liner to receive cement to resist lever out forces and to secure the cement bond with the secure acetabular shell. A replacement articular head insert is then received for dual mobility rotational movement in an inner diameter of the hemispherical liner. A femoral head implant is received for articulating movement in the articular head insert.

An acetabular shell for use in a hip prosthesis is provided. The shell includes a body having an inner periphery and a convex outer periphery and defining a cavity of the body. The outer periphery has a first portion defining a hemisphere and a second portion extending from the equator of the first portion in a converging direction. The second portion forms a rim opposed to the equator. The cavity is positioned within the rim.

An acetabular component for a prosthetic hip joint generally consists of an acetabular shell and an acetabular liner. The acetabular liner includes a cup portion and at least one constraining portion. The cup portion has a hemispherical or dome-shape that defines a hemispherical cavity for receiving a femoral head of a femoral component. The constraining portions may include extensions for retaining the femoral head in the cavity of the cup portion. The liner further includes cutout portions between the constraining portions. The acetabular liner is rotatable within the acetabular shell to provide a complete range of motion to the femoral component without fear of impingement, subluxation, or dislocation of the femoral head. The constraining portions may include inclined surfaces to induce rotation of the acetabular liner within the acetabular shell.

A trial implant kit includes a plurality of intermediate components and a plurality of inner components. Each of the plurality of intermediate components has a uniform inner surface, although at least two of the plurality of intermediate components having distinct outer surfaces. Each of the distinct outer surfaces is configured to engage one of a plurality of acetabular shell component geometries. Each of the plurality of inner components has a uniform outer surface portion and a bearing surface, the uniform outer surface portion configured to be received by the uniform inner surface of any of plurality of intermediate components. The bearing surface is configured to engage a femoral head. At least two of plurality of inner components having distinct bearing surface configurations.

A cotyle including a metallic insertion acetabular shell having an outer, essentially hemispherical, convex anchoring face formed in such a way as to be anchored in a cotyloid cavity of the pelvis of a patient, and a concave receiving face. The cotyle also includes a fixed definitive articular ceramic insert having an outer face engaging in the concave receiving face of the metallic insertion acetabular shell, and an inner receiving face including a concave, essentially hemispherical, articular surface for allowing the engagement and pivoting of a femoral prosthesis head or a mobile articular insert. The cotyle is packed in its assembled sterile state, with the definitive fixed articular ceramic insert engaged in the metallic insertion acetabular shell having a peripheral receiving structure that can receive means for fixing an impacter for positioning a cotyle and is designed in such a way that the impacter can be fixed to the cotyle in the presence of the definitive fixed articular ceramic insert.

Systems, devices, and methods are provided for aligning acetabular implants. A patient-matched acetabular alignment tool is used to orient tools and implants intraoperatively. The patient-matched acetabular alignment tool includes a mounting member and leg members which are configured based on the particular patient's anatomic landmark sites (e.g., acetabular bony landmarks). The leg members are attached to the mounting member and configured to connect with a respective anatomic landmark site to achieve a desired implant angle and axis. For example, the leg members may form a tripod support base through which an acetabular shell may be inserted into the patient's acetabulum at desired angles of version and inclination. In some embodiments, the leg members may be retractable and expandable with respect to the mounting member, thereby providing a tool with reduced profile for inserting the device in the patient's soft tissue.

An acetabular component for a hip replacement system comprises an acetabular shell, and a liner having a seal for insertion into the acetabular shell. In the preferred embodiment, the shell has a smooth tapered surface in its peripheral inner surface, and the liner has several annular ridges protruding from its outer surface. Upon insertion of the liner into the shell, the annular ridges of the liner come into sealing engagement with the smooth tapered surface of the shell. This sealing engagement substantially prevents a migration of debris along an interface of the liner with the shell. The liner is provided with several peripheral tabs for interference fit with several peripheral notches in the shell. An interlock comprising another liner ridge and a shell groove, provide a positive engagement to hold the liner in the shell as it bottoms therein. In an alternative embodiment, each notch is provided with protruding lips which project into the notch and firmly grasp one of the tabs of the liner upon insertion of the liner into the shell. In this manner, micromotion between the liner and the shell is substantially inhibited.

An acetabular cup assembly for a prosthetic hip joint is disclosed. This assembly includes an outer shell having at least one shell extension, an adaptor having at least one adaptor extension, and an insert. The inclusion of an extension on the outer shell and an extension on the adaptor allows for easier manipulation and implantation of the assembly.

An anchor for securing an implant within bone. In one embodiment, the anchor is used to aid in securing an acetabular cup within an acetabulum. The anchor may be implanted within an ischial defect of the pelvis, and is attached to an outer surface of the acetabular cup shell. The anchor is made at least in part of, and may be made entirely of, a porous metal material to facilitate the ingrowth of surrounding bone into the anchor for osseointegrating the anchor into the surrounding bone. The anchor may be secured to the acetabular shell by a screw fastener or by cement, for example. The anchor may be secured to the acetabular shell before the anchor and the acetabular shell are together implanted into the acetabulum, or the anchor may be implanted into the ischial defect, followed by seating the acetabular shell in the acetabulum and then securing the acetabular shell to the anchor.

An acetabular shell liner having a variable rim surface geometry, which improves range of motion of the femoral component within the liner and decreases the incidence of dislocation and subluxation, and methods of making and using the acetabular shell liner. Prosthetic devices, more particularly hip joint prostheses, containing the acetabular shell liner having a variable rim surface geometry are also provided.

An acetabular cup assembly for a prosthetic hip joint is disclosed. This assembly includes an outer shell having at least one shell extension, an adaptor having at least one adaptor extension, and an insert. The inclusion of an extension on the outer shell and an extension on the adaptor allows for easier manipulation and implantation of the assembly.

An acetabular shell for use in a hip prosthesis is provided. The shell includes a body having an inner periphery and a convex outer periphery and defining a cavity of the body. The outer periphery has a first portion defining a hemisphere and a second portion extending from the equator of the first portion in a converging direction. The second portion forms a rim opposed to the equator. The cavity is positioned within the rim.

A tool for separating an acetabular shell of a hip prosthesis from the surrounding pelvic bone includes a fixture which attaches to the acetabular shell and has a chisel guide mounted on it. A chisel associated with the chisel guide is curved to conform to the outer periphery of the acetabular shell, and the chisel guide causes the chisel to circumscribe the acetabular shell as the chisel is inserted between the acetabular shell and the pelvis.

An acetabular liner insertion guide (10) aligns a liner (12) within an acetabular shell. The liner includes a ring (16) and a penetrable layer (14). The ring includes a lip configured to rest on an upper surface of the acetabular shell. The ring is also configured to attach to the liner such that an upper surface of the liner is in a plane that is generally parallel to a plane that includes the upper surface of the acetabular shell. The penetrable layer is configured to receive an impactor and overlie the liner. When the insertion guide is placed on the shell and the impactor impacts the liner, the insertion guide separates from the liner and remains on the impactor.