System, method and apparatus for evaluating tissue temperature
First Claim
1. A temperature responsive untethered sensor implant for evaluating a temperature rise from a monitoring temperature or temperatures to a set point temperature comprising:
- a core component exhibiting a relative permeability characteristic elevating in value with a corresponding elevation in monitoring temperatures and exhibiting a Curie temperature above said monitoring temperatures corresponding with said set point temperature;
an inductive winding with turns wound about said core component to define an inductive component;
a capacitor coupled with said inductive winding to define a resonant circuit electromagnetically excitable to have a resonating output at a select resonant center frequency and exhibiting a decrease in the intensity of said resonating output at said select resonant center frequency when at temperatures approaching at said Curie temperature.
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Abstract
Method, system and apparatus for monitoring target tissue temperatures wherein temperature sensors are configured as passive resonant circuits each with a unique resonating signature at monitoring temperatures extending below a select temperature setpoint. The resonant circuits are configured with an inductor component formed of windings about a ferrite core having a Curie temperature characteristic corresponding with a desired temperature setpoint. By selecting inductor winding turns and capacitance values, unique resonant center frequencies are detectable. Temperature monitoring can be carried out with implants at lower threshold and upper limit temperature responses. Additionally, the lower threshold sensors may be combined with auto-regulated heater implants having Curie transitions at upper temperature limits.
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Citations
22 Claims
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1. A temperature responsive untethered sensor implant for evaluating a temperature rise from a monitoring temperature or temperatures to a set point temperature comprising:
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a core component exhibiting a relative permeability characteristic elevating in value with a corresponding elevation in monitoring temperatures and exhibiting a Curie temperature above said monitoring temperatures corresponding with said set point temperature; an inductive winding with turns wound about said core component to define an inductive component; a capacitor coupled with said inductive winding to define a resonant circuit electromagnetically excitable to have a resonating output at a select resonant center frequency and exhibiting a decrease in the intensity of said resonating output at said select resonant center frequency when at temperatures approaching at said Curie temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification