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Obstetrics & Gynecology 1970;35:96-103
© 1970 by The American College of Obstetricians and Gynecologists
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An Intravaginal Fetal ECG Telemetry System

M R NEUMAN, F H CRITCHFIELD and W C LIN

From the Microelectronics Laboratory for Biomedical Sciences, Case Western Reserve University, and the Perinatal Clinical Research Center at Cleveland Metropolitan General Hospital, Bingham Bldg, Cleveland, Ohio 44106

Abstract

A radio telemetry system for monitoring fetal electrocardiograms during labor and delivery has been designed, constructed, and evaluated. It is based upon a miniature FM radio transmitter which can be placed vaginally at the electrode site, thus eliminating the need for wire leads connecting the patient to an exogenous electronic signal processor. The system provides reliable signals and has lower electrical interference pickup than wire systems, as well as complete electrical isolation of the patient.






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