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Prosthetic hip implantsProsthetic hip implants description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070219641, Prosthetic hip implants. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND [0001]1. Field of the Invention [0002]The present invention relates to prosthetic hip implant components, including a hip stem for implantation in the proximal femur and an acetabular cup for implantation in the acetabulum. In particular, the present invention relates to prosthetic hip stems and acetabular cups which include improved features adapted to achieve more optimized results with certain types of patient anatomy, such as the anatomy of female patients. [0003]2. Description of the Related Art [0004]Orthopedic implants are commonly used to replace some or all of a patient's hip joint in order to restore the use of the hip joint, or to increase the use of the hip joint, following deterioration due to aging or illness, or injury due to trauma. In a hip replacement, or hip arthroplasty procedure, a femoral component is used to replace a portion of the patient's femur, including the femoral neck and head. The femoral component is typically a hip stem, which includes a stem portion positioned within the prepared femoral canal of the patient's femur and secured via bone cement, or by a press-fit followed by bony ingrowth of the surrounding tissue into a porous coating of the stem portion. The hip stem also includes a neck portion adapted to receive a prosthetic femoral head. The femoral head is received within a prosthetic acetabular component, such as an acetabular cup received within the prepared recess of the patient's acetabulum. [0005]One known hip stem includes a core formed of either a cobalt-chromium-molybdenum alloy or titanium, and a porous surface layer in the form of a matrix of small metallic beads or a wire mesh. Typically, the porous surface layer is sintered to the core by heating the core and the porous surface layer to a high temperature in order to cause the porous surface layer and core to fuse, melt, or bond together along their interface. U.S. Pat. Nos. 6,395,327, 6,514,288, and 6,685,987, each assigned to the assignee of the present invention and hereby incorporated by reference, disclose various methods of enhancing the fatigue strength and the connection between the core and the porous surface layer of the foregoing types of hip stems. SUMMARY [0006]The present invention provides prosthetic hip stems and acetabular cups for use in prosthetic hip joints. The hip stem may include a core having a stem portion and a neck portion, a polymer matrix layer substantially covering the stem portion of the core, and a porous metal layer substantially covering the polymer matrix layer. The polymer matrix layer connects the core and the porous metal layer and provides a stiffness for the hip stem which more closely mimics the stiffness of bone than do known hip stems. The hip stems and acetabular cups additionally include a number of improvements adapted for more optimized results with certain types of patient anatomy, such as the anatomy of female patients, for example. [0007]In one form thereof, the present invention provides a prosthetic hip stem, including a stem portion having a proximal end and a distal end, the stem portion defining a medial/lateral plane; and a neck portion projecting from the proximal end, the neck portion having a longitudinal axis therealong which is oriented at a first angle between 13 degrees and 25 degrees anteriorly with respect to the medial/lateral plane. [0008]In another form thereof, the present invention provides a prosthetic hip stem, including a stem portion having a proximal end and a distal end, the stem portion defining a medial/lateral plane therethrough; a neck portion projecting from the proximal end of the stem portion and having a first, longitudinal axis; and a head portion of substantially spherical shape and connected to the neck portion along the first axis, the head portion having a center disposed on second axis which is disposed at a second angle of between 1 and 25 degrees anteriorly with respect to the first axis. [0009]In a further form thereof, the present invention provides a prosthetic hip stem, including a stem portion having a proximal end and a distal end, and a first, proximal/distal longitudinal axis; and a neck portion projecting from the proximal end, the neck portion having a second longitudinal axis therealong which is oriented at a first angle of between 90 and 145 degrees with respect to the first axis. [0010]In another form thereof, the present invention provides a prosthetic hip stem, including a stem portion having a proximal end and a distal end; and a distal end fixation mechanism operable between a first condition wherein the distal end of the stem portion has a first width with respect to at least one of a medial/lateral plane and an anterior/posterior plane of the stem portion and a second condition wherein the distal end of the stem portion has a second width with respect to at least one of the medial/lateral plane and the anterior/posterior plane, the second width greater than the first width. [0011]In another form thereof, the present invention provides an acetabular cup, including a substantially hemispherical cup portion made of a relatively thin, flexible porous metal; and a liner fitted within the cup portion, the liner including a substantially hemispherical bearing surface. [0012]In another form thereof, the present invention provides an acetabular cup, including a liner including a substantially hemispherical bearing surface; a porous metal cup portion; and an intermediate layer disposed between the liner and the porous metal cup portion, the intermediate layer formed of a polymer matrix. [0013]In another form thereof, the present invention provides an acetabular cup, including a liner including a substantially hemispherical bearing surface; and a cup portion including an outer hemispherical portion including a substantially annular loading rib. [0014]In another form thereof, the present invention provides a prosthetic hip stem, including a proximal end including a core, a polymer matrix layer covering at least a portion of the core, and a porous metal layer substantially covering the polymer matrix layer; and a distal end including a core and a porous metal layer substantially covering the core. [0015]In a further form thereof, the present invention provides a prosthetic hip stem, including a proximal end and a distal end; an inner core; a porous metal outer layer; and an elongated cavity formed in the distal end, wherein the distal end is flexible. BRIEF DESCRIPTION OF THE DRAWINGS [0016]The above-mentioned and other features of this disclosure, and the manner of attaining them, will become more apparent and will be better understood by reference to the following description of embodiments taken in conjunction with the accompanying drawings, wherein: [0017]FIG. 1 is a first isometric view of a hip stem according to the present invention; [0018]FIG. 2 is a second isometric view of the hip stem of FIG. 1; [0019]FIG. 3 is a first isometric view of the core of the hip stem of FIGS. 1 and 2; [0020]FIG. 4 is a second isometric view of the core of the hip stem of FIGS. 1 and 2; [0021]FIG. 5 is a sectional view through the hip stem, taken along line 5-5 of FIG. 2; Continue reading about Prosthetic hip implants... Full patent description for Prosthetic hip implants Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Prosthetic hip implants patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Prosthetic hip implants or other areas of interest. ### Previous Patent Application: Ceramic-on-ceramic prosthetic device coupled to a flexible bone interface Next Patent Application: Apparatus for treating a bifurcated region of a conduit Industry Class: Prosthesis (i.e., artificial body members), parts thereof, or aids and accessories therefor ### FreshPatents.com Support Thank you for viewing the Prosthetic hip implants patent info. 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