Orthopedic screw for measuring a parameter of the muscular-skeletal system
First Claim
1. An orthopedic screw and system comprising:
- a first circuit in a module wherein the module is configured to be placed at first location; and
a second circuit in a cavity of a screw wherein the screw is configured to fasten to a muscular-skeletal system at a second location, wherein the second circuit comprises a passive circuit, wherein the module and screw are configured to form a closed loop to repeatably propagate a signal through the first and second circuit and wherein the signal corresponds to a parameter being measured.
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Accused Products
Abstract
A dual-mode closed-loop measurement system for capturing a transit time, phase, or frequency of energy waves propagating through a medium is disclosed. A first module comprises an inductor drive circuit, an inductor, a transducer, and a filter. A second module housed in a screw comprises an inductor and a transducer. The screw is bio-compatible and allows an accurate delivery of the circuit into the muscular-skeletal system. The inductor can be attached and interconnected on a flexible substrate that fits into a cavity in the screw. The first and second modules are operatively coupled together. The first module provides energy to power the second module. The second module emits an energy wave into the medium that propagates to the first module. The transit time of energy waves is measured and correlated to the parameter by known relationship.
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Citations
20 Claims
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1. An orthopedic screw and system comprising:
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a first circuit in a module wherein the module is configured to be placed at first location; and a second circuit in a cavity of a screw wherein the screw is configured to fasten to a muscular-skeletal system at a second location, wherein the second circuit comprises a passive circuit, wherein the module and screw are configured to form a closed loop to repeatably propagate a signal through the first and second circuit and wherein the signal corresponds to a parameter being measured. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. An orthopedic screw and system comprising:
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a screw including a cavity configured to fasten to a muscular-skeletal system; and a circuit in the cavity where the circuit consists of a passive circuit configured to transmit an energy wave to the muscular-skeletal system wherein a transducer and an inductor couple to a substrate, wherein the substrate includes interconnect coupling the transducer to the inductor, and wherein die of the inductor and the transducer is stacked. - View Dependent Claims (13, 14, 15, 16)
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17. A measurement system comprising:
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a module having a first circuit wherein the first circuit is a passive circuit; a screw configured to fasten to a muscular-skeletal system wherein the screw includes a second circuit, wherein a signal propagates at least two times in a closed loop between the module and the screw, and wherein the transit time, frequency, or phase of the signal corresponds to a parameter being measured. - View Dependent Claims (18, 19, 20)
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Specification