Quantitative assessment of prosthesis press-fit fixation
AssigneeKambiz Behzadi
InventorsKambiz Behzadi, Michael E. Woods
Life of this patent
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Abstract
A system and method for quantitatively assessing a press fit value (and provide a mechanism to evaluate optimal quantitative values) of any implant/bone interface regardless the variables involved including bone site preparation, material properties of bone and implant, implant geometry and coefficient of friction of the implant-bone interface without requiring a visual positional assessment of a depth of insertion. The following description is presented to enable one of ordinary skill in the art to make and use the invention and is provided in the context of a patent application and its requirements.
Claims13
An acetabular cup for an installation into an irregularly-profiled cavity in a portion of bone, the installation having a desired orientation profile for the acetabular cup, comprising:
- an irregularly-profiled exterior shell portion defining a generally hemispherical interior cavity, said irregularly-profiled exterior shell portion configured to be complementary to the irregularly-profiled cavity;
- wherein said irregularly-profiled exterior shell portion is configured for a press fit fixation into the irregularly-profiled cavity;
- and
- wherein a composite of the irregularly-profiled cavity and said irregularly-profiled exterior shell cooperatively define a unique orientation key producing the desired orientation profile for the acetabular cup when installed into the irregularly-profiled cavity.
A kit for an installation of an implant into an irregularly-profiled cavity in a portion of bone, the kit including:
- a preoperatively-determined orientation for the implant;
- a body of the implant defining a body portion configured for fixation within the irregularly-profiled cavity, said body portion including a body keying structure;
- and
- a bone-preparation tool configured to produce the irregularly-profiled cavity in the portion of bone, the cavity having an interior wall surface defining a cavity portion configured for receiving said body portion, said cavity portion including a cavity keying structure complementary to said body keying structure;
- wherein a composite of said keying structures cooperatively produce said preoperatively-determined orientation by defining a unique key imparting said preoperatively-determined orientation when said body portion is fixated within said cavity portion.
Dependencies are inferred from the claim text.