Patent ID: 7684871

Claim:
A system for evaluating a temperature related physical parameter at a target region of a patient, comprising: one or more tetherless passive resonant implants located internally within said patient in thermally responsive relationship with said target region, each said implant having a unique resonant electromagnetic response within a frequency bandwidth of responses in reaction to an extra body applied electromagnetic field when said implant is at a monitor temperature or temperatures; an excitation assembly comprising an excitation antenna positionable adjacent said patient at a location effective to derive said unique electromagnetic response, a high voltage power supply having a high voltage output, when enabled, a resonant excitation circuit coupled with said excitation antenna and responsive to an excite signal to effect generation of said applied electromagnetic field for an excitation interval; a detector assembly comprising a sense antenna positionable adjacent said patient at a location effective, when said detector assembly is enabled, to detect said unique electromagnetic response as a sense antenna output, a bandpass filter network coupled to filter said sense antenna output in correspondence with said frequency bandwidth of responses, and an amplifier network configured to amplify said filtered sense antenna output to provide an amplified output; a control circuit responsive to derive said excite signal for said excitation interval, subsequently responsive to enable said detector assembly to permit derivation of said amplified output; a data acquisition and control network responsive to sample and digitize said amplified output to provide digitized waveform data, to derive frequency intensity signals therefrom about the center frequencies of each said unique resonant electromagnetic response when a said implant is at a said monitor temperature or temperatures, responsive to said frequency intensity signals and implant identification data representing a corresponding unique resonant electromagnetic response to derive implant status data; and a readout assembly responsive to said implant status data to provide a discernable readout corresponding therewith.