Circuit and method for the radiotelemetry of esophageal pH in an

Details Circuit and method for the radiotelemetry of esophageal pH in an Circuit and method for the radiotelemetry of esophageal pH in an

1980-05-13

1982-04-27

Michell, Robert W.

Surgery

Truss

Pad

128903, A61B 500

Patent

active

043265359

ABSTRACT:
A circuit and method for radiotelemetry of an esophageal pH signal in an electrocardiogram (ECG) signal radiotelemetry system includes esophageal and reference pH electrodes (16 and 17) connected to a pH meter (15) for monitoring esophageal pH and generating a signal proportional thereto and a waveform converter circuit (12) for converting the same to a signal whose waveform is similar to an ECG waveform and one of whose parameters, such as frequency, is proportional to esophageal pH. A conventional ECG radiotelemetry system (13) includes an ECG signal transmitter (31) receiving and broadcasting the converted signal to a remote ECG signal receiver (32). A display (14) receives the demodulated converted waveform from ECG signal receiver (32) and displays indicia of esophageal pH.

REFERENCES:
Kurt, E.J. et al, "Radiotelemetry pH Determination for Gastroesophageal Reflux, " Amer. Jrnl. Gastroenterology vol. 58, pp. 390-395 (1972).
Maycock, B. F., "A Long--Term Remote Intragastric pH and Motility Monitoring System, " Biomed. Sci. Instr., 6th Nat. Symp., May 21-23, 1968, pp. 127-135.
Baurschmidt, P. et al., "Implant. Telem. System for Long--Term pH Monitoring in the Stomach, " Biotelem. 2nd Int. Symp., Davos, Switz., 1974 pp. 46-48.
Briskman, B., "Telemetry Today, " Electronics Sep. 6, 1973, pp. 31-37.
Filshie, J. H., "A Hybrid Thin--Film Multichannel Biotelem. Transmitter, " Conf. on Hybrid Microelectro., Loughborough, Eng. 9-11 Sep. 1975 pp. 49-56.

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