Circuit and method for the radiotelemetry of esophageal pH in an ECG radiotelemetry system
Patent 4326535 Issued on April 27, 1982. Estimated Expiration Date: 
May 13, 2000. 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.
May 13, 2000. 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.InventorsAssigneeApplicationNo. 06/149427 filed on 05/13/1980US Classes:600/302, Endoradiosonde128/903RADIO TELEMETRYExaminersPrimary: Michell, Robert W.Assistant: Jaworski, Francis J. Attorney, Agent or FirmInternational ClassesA61B 5/00 (20060101)G01N 27/28 (20060101) AbstractA 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.Other References
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