Modular hip prosthesis
AssigneeBoehringer Mannheim GmbH
InventorsRichard Bolesky, Todd S. Smith, Charles E. Whitcraft, Jr.
Life of this patent
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Abstract
A modular hip prosthesis for the replacement of a portion of the femur is provided. The prosthesis is assembled from a kit that includes a stem member having an upper portion and a lower portion, with the lower portion sized to be received in the femur. The kit also includes a body member that is sized to replace a portion of the femur and is configured to be received over the upper portion of a stem member. The kit also includes a head member that is sized to replace the head of the femur. A neck member is provided to attach the head member to the body member to form an assembled prosthesis.
Claims21
A kit for assembly of a hip prosthesis for replacement of a head, neck, and adjacent portions of a femur, the neck of the femur having a base defining a neck basal plane, the kit comprising:
- at least two stem members having an upper portion and a lower portion, the lower portion sized to be received in a shaft of the femur,
- at least two body members sized to replace a portion of the femur and each body member configured so that any one of the at least two body members is receivable over said upper portion of any one of the at least two stem members and said body member having an upper surface defining a plane generally coincident with said neck basal plane, and
- at least two head members sized to replace the head of the femur and including means to attach any one of the at least two said head members to any one of said at least two body members on said plane.
An implant system for replacing a portion of a femur, said femur having a neck with a base defining a neck basal plane and having a longitudinal cavity defining a first axis, the system comprising a plurality of components with each component being provided in various sizes and shapes, said components including, a body member, each body member being formed to include a longitudinal bore that is generally aligned with said first axis and an upwardly and inwardly facing, generally planar surface defining a plane generally coincident with said neck basal plane, said surface formed to include an opening, an elongated stem member having an upper portion and a lower portion, said lower portion configured to be received in said femur cavity and said upper portion configured to be received and secured in said body member bore, and a head member sized to replace a head of the femur including means for engaging said head member with said surface, opening in said body member.
In an implant system for replacing a portion of a femur, said femur having a neck with a base defining a neck basal plane and having a longitudinal cavity defining a first axis, the implant system comprising a body member formed to include a longitudinal bore that is generally aligned with said first axis and an upwardly and inwardly directed portion, an elongated stem member having an upper portion received in the longitudinal bore being secured therein by a fastener and a lower portion received in the longitudinal cavity of the femur, and a head member sized to replace a head of the femur including means for engaging said head member with the upwardly and inwardly directed portion of the body member, the upwardly and inwardly directed portion including a planar surface defining a plane generally coincident with said neck basal plane, the improvement comprising a top surface at an uppermost end of the body member, perpendicular to said first axis, and intersecting an inclined surface coincident with the neck basal plane, an upper end of the longitudinal cavity emerging through the top surface, said fastener being situated above said top surface and having a lower surface confronting the top surface.
The improvement of claim 19 further comprising a collar member configured to be disposed between said neck member and said body member in a plane generally coincident with said neck basal plane.
Dependencies are inferred from the claim text.