AM/FM multi-channel implantable/ingestible biomedical monitoring telemetry system
Patent 5415181 Issued on May 16, 1995. Estimated Expiration Date: 
December 1, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 1, 2013. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2233183 2237522 2675540 3188615 3210747 3500248 3572316 3682160 3717857 Miniature ingestible telemeter devices to measure deep-body temperature InventorsAssigneeApplicationNo. 160716 filed on 12/01/1993US Classes:600/549, Temperature detection128/903, RADIO TELEMETRY600/300DIAGNOSTIC TESTINGExaminersPrimary: Sykes, Angela D.Attorney, Agent or FirmInternational ClassA61B 005/00AbstractA multi-channel circuit for telemetering 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 temperature. 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.Other References
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