Quantitative assessment of prosthesis press-fit fixation
OwnerKambiz Behzadiinventor
Life of this patent
Estimating the term…
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.
Claims19
An apparatus for insertion of a prosthesis into a cavity formed in a portion of bone, the prosthesis configured for a pressfit fixation with respect to the cavity, comprising:
- an insertion device providing an insertion force to the prosthesis, said insertion force operating over a period, said period including an initial prosthesis insertion act with said insertion device and a subsequent prosthesis insertion act with said insertion device;
- and
- a system physically coupled to said insertion device configured to provide a real-time parametric evaluation, during said period, of an extractive force of an interface between the prosthesis and the cavity, said parametric evaluation including an evaluation of a set of factors of the prosthesis with respect to the cavity, said set of factors including one or more of a rigidity factor, an elasticity factor, and a combination of said rigidity factor and said elasticity factor.
An apparatus for installing a prosthesis into a configured for a pressfit fixation prepared cavity in a portion of a bone, comprising:
- a force applicator operating an insertion force configured for an installation of the prosthesis into the cavity;
- a force transfer structure, coupled to said force applicator and to the prosthesis, for conveying an application force F1 to the prosthesis, said application force F1 derived from said insertion force;
- a force sensing system determining a force response of the prosthesis at an interface of the prosthesis and the cavity, said force response responsive to said application force F1 and including a force response component F2;
- and
- a controller, coupled to force applicator and to said force sensing system, said controller setting an operational parameter for said insertion force, said operational parameter establishing said application force F1, said controller responsive to said force response to establish a set of parameters including one or more of a rigidity metric, an elasticity metric, and combinations thereof;
- further including an F1 sensor and an F2 sensor, both sensors disposed between said force applicator and the prosthesis;
- wherein said application force F1 is measured in real-time by said F1 sensor;
- wherein said force response component is measured in real-time by said F2 sensor.
An apparatus for insertion of a prosthesis into a cavity formed in a portion of bone, the prosthesis configured for a pressfit fixation with respect to the cavity, comprising:
- means for applying an insertion force to the prosthesis, said insertion force operating over a period, said period including an initial prosthesis insertion act with said insertion device and a subsequent prosthesis insertion act with said insertion device;
- and
- means, physically coupled to said insertion device, for determining a parametric evaluation of an extractive force of an interface between the prosthesis and the cavity during said period, said parametric evaluation including an evaluation of a set of factors of the prosthesis with respect to the cavity, said set of factors including one or more of a rigidity factor, an elasticity factor, and a combination of said rigidity factor and said elasticity factor.
Dependencies are inferred from the claim text.