System and method of interrogating implanted passive resonant-circuit devices
First Claim
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1. A system for monitoring the pressure within the cranium of a living being, said system comprising:
- a resonant frequency circuit that is implanted within the cranium;
a remotely-located transmitter and a remotely-located receiver coupled through alternation means that operates said transmitter and receiver in alternation such that when said transmitter is transmitting an interrogation signal to said resonant frequency circuit said remotely-located receiver is de-activated and when said receiver is listening to a response signal from said resonant frequency circuit said transmitter is de-activated;
said interrogation signal comprising high frequency electromagnetic excitation waves wherein one of said excitation waves causes said resonant frequency circuit to resonate at an altered resonance frequency corresponding to the pressure of the cranium;
said remotely-located receiver detecting said altered resonance frequency in said response signal; and
a display, coupled to said remotely-located receiver, for displaying the pressure of the cranium corresponding to said detected altered resonance frequency.
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Abstract
A system and method for interrogating implanted passive resonant circuits is described. The resonant frequency is detected by transmitting a train of short pulses and then listening between the pulses for output of the resonant circuit. With proper spacing between the pulses, a vastly improved signal-to-noise ratio is obtained.
101 Citations
20 Claims
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1. A system for monitoring the pressure within the cranium of a living being, said system comprising:
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a resonant frequency circuit that is implanted within the cranium; a remotely-located transmitter and a remotely-located receiver coupled through alternation means that operates said transmitter and receiver in alternation such that when said transmitter is transmitting an interrogation signal to said resonant frequency circuit said remotely-located receiver is de-activated and when said receiver is listening to a response signal from said resonant frequency circuit said transmitter is de-activated; said interrogation signal comprising high frequency electromagnetic excitation waves wherein one of said excitation waves causes said resonant frequency circuit to resonate at an altered resonance frequency corresponding to the pressure of the cranium; said remotely-located receiver detecting said altered resonance frequency in said response signal; and a display, coupled to said remotely-located receiver, for displaying the pressure of the cranium corresponding to said detected altered resonance frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. The system of claim 13 wherein said receiver further comprises logic means having a first input coupled to the output of said differentiator and a second input coupled to said voltage sweeper, said logic means having an output coupled to said display and wherein said logic means decouples said receiver from said display during said re-trace portions of said ramp voltage while permitting said display to display the pressure of the cranium when said altered resonance frequency is detected by said receiver.
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14. A method for monitoring the pressure within the cranium of a living being, said method comprising the steps of:
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implanting a resonant frequency circuit within the cranium; transmitting high frequency electromagnetic excitation waves from a transmitter to said resonant frequency circuit while precluding a receiver from receiving any response signal from said resonant frequency circuit during said transmitting and wherein one of said excitation waves causes said resonant frequency circuit to resonate at an altered resonance frequency corresponding to the pressure of the cranium; precluding said transmitter from transmitting said high frequency electromagnetic waves while said receiver receives a response signal from said resonant frequency circuit; detecting said altered resonance frequency in said response signal by said receiver; and displaying the pressure of the cranium corresponding to said detected altered resonance frequency. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification