Invasive sense measurement in prosthesis installation
View Patent ↗A system and method for allowing any surgeon, including those surgeons who perform a fewer number of a replacement procedure as compared to a more experienced surgeon who performs a greater number of procedures, to provide an improved likelihood of a favorable outcome approaching, if not exceeding, a likelihood of a favorable outcome as performed by a very experienced surgeon with the replacement procedure. Force sensing is included to aid in quantifying installation of an implant, particularly a cup into a pelvic bone.
1. An apparatus for an insertion of a prosthesis into a prepared cavity in a portion of bone, the prosthesis having a prosthesis profile, the prepared cavity having a cavity profile with the cavity profile configured, responsive to the prosthesis profile, to retain the prosthesis within the prepared cavity using a press fit fixation, comprising:
an insertion device providing an insertion agency to the prosthesis, said insertion agency operating over a period including an initial prosthesis insertion act with said insertion device to a subsequent prosthesis insertion act with said insertion device; and
a sensing system physically coupled to said insertion device configured to provide a parametric evaluation of an extractive force of an interface between the prosthesis and the cavity during said period;
wherein an applied force having a first magnitude is applied to said insertion device for inserting the prosthesis into the prepared cavity, further comprising:
a device sensor configured to measure a magnitude of a measured impact force within said insertion device responsive to an application of said applied force to said insertion device;
wherein said parametric evaluation includes a comparison of said measured impact force to said applied force.
2. An apparatus for an insertion of a prosthesis into a prepared cavity in a portion of bone, the prosthesis having a prosthesis profile, the prepared cavity having a cavity profile with the cavity profile configured, responsive to the prosthesis profile, to retain the prosthesis within the prepared cavity using a press fit fixation, comprising:
an insertion device providing an insertion agency to the prosthesis, said insertion agency operating over a period including an initial prosthesis insertion act with said insertion device to a subsequent prosthesis insertion act with said insertion device; and
a sensing system physically coupled to said insertion device configured to provide a parametric evaluation of an extractive force of an interface between the prosthesis and the cavity during said period;
wherein an applied force having a first magnitude is applied to said insertion device for inserting the prosthesis into the prepared cavity, further comprising:
a device sensor configured to measure a magnitude of a measured impact force within said insertion device responsive to an application of said applied force to said insertion device;
wherein said parametric evaluation includes a series of comparisons of said measured impact force to said applied force responsive to a series of impacts from said applied force.
3. An apparatus for an insertion of a prosthesis into a prepared cavity in a portion of bone, the prosthesis having a prosthesis profile, the prepared cavity having a cavity profile with the cavity profile configured, responsive to the prosthesis profile, to retain the prosthesis within the prepared cavity using a press fit fixation, comprising:
an insertion device providing an insertion agency to the prosthesis, said insertion agency operating over a period including an initial prosthesis insertion act with said insertion device to a subsequent prosthesis insertion act with said insertion device; and
a sensing system physically coupled to said insertion device configured to provide a parametric evaluation of an extractive force of an interface between the prosthesis and the cavity during said period;
wherein said parametric evaluation of said extractive force includes a response of the prosthesis within the prepared cavity to said insertion agency;
wherein said insertion agency includes an applied force directed to the prosthesis; and
wherein said response includes a force response of the prosthesis within the prepared cavity further comprising:
a first sensor configured to quantize said applied force to establish a first quantized force;
a second sensor configured to quantize said force response to establish a second quantized force; and
a system control, coupled to said sensors, comparing said quantized forces in determining said parametric evaluation of said extractive force.
4. The apparatus of claim 3 wherein said system control includes a first threshold, wherein said system control is configured to determine a first relationship between said quantized forces, wherein said system control is configured to compare said first relationship to said first threshold to establish a first comparison.
5. The apparatus of claim 4 further comprising an automated force applicator, coupled to said insertion device and responsive to a first control signal, configured to produce said applied force.
6. The apparatus of claim 5 wherein said system control produces said first control signal and is coupled to said automated force applicator and wherein said automated force applicator includes a variable force modifier configured to predictably alter a magnitude of said applied force responsive to said first control signal.
7. The apparatus of claim 6 wherein said automated force applicator produces an increase in said magnitude of said applied force responsive to said first control signal when said first comparison is within said first threshold.
8. The apparatus of claim 4 wherein said first relationship includes a difference between said quantized forces.
9. The apparatus of claim 4 wherein said system control includes a second threshold, wherein said system control is configured to determine a second relationship between said quantized forces, wherein said system control is configured to compare said second relationship to said second threshold to establish a second comparison.
10. The apparatus of claim 9 wherein said second relationship includes a rate said magnitude of said second quantized force approaches said magnitude of said first quantized force and wherein said system control is configured to compare said rate to said second threshold to establish a second comparison.
11. The apparatus of claim 9 wherein said system control produces an indication responsive to said second comparison.