Hip joint prostheses and methods for manufacturing the same
AssigneeJohnson & Johnson Professional, Inc.
InventorSalvatore Caldarise
Life of this patent
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Abstract
An implantable bone prosthesis, such as an acetabular shell, includes a bone engaging region that is made from a cast metal or metal alloy and an articulation surface that is formed of a ceramic material or a metal that is permanently attached to the metal bone engaging region. The bone engaging region of the prosthesis preferably includes a dampening mechanism to absorb some of the loading forces communicated to the acetabular cavity. The bone prosthesis is formed by a casting process from casting molds that are prepared using a three dimensional printing technique.
Claims13
An implantable bone prosthesis in the form of a substantially hemispherical cup for attachment within the acetabulum cavity of the pelvis, the prosthesis comprising:
- an external portion for mounting within the acetabulum cavity including a metallic dome-like structure having a textured, irregular bone-contacting surface, the bone-contacting surface further including a discontinuous portion forming a substantially hemispherical dampening structure for absorbing loading forces communicated to the acetabular cavity and a mounting surface having a substantially cup-like shape;
- and
- an internal portion for receiving a femoral had of a femur having a substantially cup-like shape and being formed of a biologically compatible ceramic or metallic material, the internal portion having a first surface that is permanently affixed to the mounting surface of the external portion and a second, substantially smooth articulation surface for seating the femoral head.
An implantable bone prosthesis in the form of a substantially hemispherical cup for attachment to the acetabulum cavity of the pelvis, the prosthesis comprising:
- a metallic dome-like structure for mounting within the acetabulum cavity including a textured, irregular bone-contacting surface and a substantially smooth articulation surface having a substantially cup-like shape for seating a femoral head of a femur;
- and
- a substantially hemispherical dampening structure for absorbing loading forces communicated to the acetabulum cavity, the dampening structure being formed by one or more discontinuities in the bone-contacting surface of the metallic dome-like structure.
An implantable artificial hip joint comprising:
- a femoral component having an elongated shaft with a neck at a proximal end thereof;
- a hemispherical femoral head having a smooth outer articulation surface adapted to seat within an acetabular shell and a second surface adapted to be secured to the neck of the femoral component;
- and
- an acetabular cup for attachment to the acetabulum cavity of the pelvis, including
- (i) an external portion for mounting within the acetabulum cavity, the internal portion including a metallic dome-like structure having a textured, irregular bone-contacting surface and a mounting surface having a substantially cup-like shape, the bone-contacting surface further including a discontinuous portion forming a substantially hemispherical dampening structure for absorbing loading forces communicated to the acetabulum cavity;
- and
- (ii) an internal portion for receiving a femoral head of a femur having substantially cup-like shape and being formed of a biologically compatible ceramic material, the internal portion having a first surface that is permanently affixed to the mounting surface of the external portion and a second, substantially smooth bearing surface for seating the femoral head.
An implantable bone prosthesis, comprising
- a substantially hemispherical cup-like structure for attachment within the acetabulum cavity of the pelvis, the hemispherical cup-like structure including a dome-like external, bone engaging surface and an opposed internal concave surface;
- a dampening structure formed in the dome-like external, bone engaging surface for absorbing loading forces communicated to the acetabulum cavity, the dampening structure being in the form of one or more discontinuities formed in the dome-like portion of the bone engaging surface;
- and
- a polymeric liner material joined to the internal concave surface of the hemispherical cup-like structure.
Dependencies are inferred from the claim text.