Core Body Temperature Pill Technology

A multichannel circuit for telemetry signals representing physiological values from a point in a human body to a receiver (24) outside of the body. The two signals (S1, S2) other than the temperature signal (27') are used to provide two frequency modulated signals (14, 16) summed by an amplifier (18) with the summed FM signal then being applied to amplitude modulate (21) a carrier (8) whose frequency varies as a function of temperature. The resulting FM / AM signal (22) is telemetered inductively outside of the body to an external receiver (24). Appropriate demodulation, filter, and shaping circuits within the external circuit detect the FM signals (14, 16) and thus produce three independent frequencies two of which are the original physiological variables and the third a function of local temperatures. Real-time plot of the two physiological variables can be obtained using FM discriminators while the temperature-dependent frequency is best monitored by a counter. #1183

US 5,842,977   [MORE INFO]
US 5,415,181
US 4,844,076

Type of Offer: Licensing

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