AM/FM multi-channel implantable/ingestible biomedical monitoring

Details AM/FM multi-channel implantable/ingestible biomedical monitoring AM/FM multi-channel implantable/ingestible biomedical monitoring

1993-12-01

1995-05-16

Sykes, Angela D.

Surgery

Truss

Pad

128903, 128630, A61B 500

Patent

active

054151813

ABSTRACT:
A 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 (S.sub.1, S.sub.2) 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.

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