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.
Claims22
1-15. (canceled)
A method for an insertion of an implant into a cavity in a portion of bone, the cavity configured for a pressfit fixation with respect to the implant, comprising:
- a) providing, using a device, an implant insertion force to the implant to transition the implant toward a deepen insertion into the cavity;
- and
- b) predicting, in real-time and responsive to said implant insertion force, a press-fit fixation of the implant at an interface between the implant and the cavity during said providing of said implant insertion force.
An impact control method for installing an implant into a cavity in a portion of bone, the cavity configured for a pressfit fixation with respect to the implant, comprising:
- a) imparting a first initial known force to the implant;
- b) imparting a first subsequent known force to the implant, said first subsequent known force about equal to said first initial force;
- c) measuring, for each said imparted known force, an Xth number measured impact force;
- d) comparing said Xth measured impact force to said Xth−1 measured impact force against a predetermined threshold for a threshold test;
- and
- e) repeating steps b)-d) as long as said threshold test is negative.
A method for an automated installation of an implant into a cavity in a portion of bone, comprising:
- a) initiating an application of an installation force to the implant, said installation force including an energy communicated to the implant moving the implant deeper into the cavity in response thereto;
- b) recording a set of measured response forces responsive to said installation force;
- c) continuing applying and recording until a difference in successive measured responses is within a predetermined threshold to estimate no significant displacement of the implant at said energy as the implant is installed into the cavity;
- d) increasing said energy;
- e) repeating steps b)-c) until a plateau of said set of said measured response forces;
- and
- f) terminating steps b)-e) when a steady-state is detected.
A method 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:
- a) 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
- b) providing a real-time parametric evaluation, during said period, 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.
The method of claim of 25 wherein one of said plurality of fused weighted factors include one or more of a first weighted F2, a second weighted F3, and a third weighted F5.
force force force
A method for installing a prosthesis into a cavity prepared in a portion of bone, the cavity configured for a pressfit fixation, comprising:
- a) communicating an application force F1 to the prosthesis;
- b) monitoring a rigidity factor and an elasticity factor of the prosthesis within the cavity during application of the application force F1;
- c) repeating a)-b) until said rigidity factor meets a first predetermined goal;
- d) increasing, when said rigidity factor meets said predetermined goal, said application force F1;
- e) repeating a)-d) until said elasticity factor meets a second predetermined goal;
- and
- f) suspending a) when said elasticity factor meets said first goal and said rigidity factor meets said second goal.
36-47. (canceled)
Dependencies are inferred from the claim text.