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An Apparatus for Recording Heartbeats of a Fetus

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1 Author(s)
Erik Mack ; Nera Bergen A/S, Solheimsvik, Bergen, Norway.

Obstetricians have expressed a wish for a simple and low-cost apparatus for monitoring the heartbeats of a fetus before and during birth. This paper describes a special type of amplifier that was built to satisfy this requirement. By transposing the low frequencies of the heartbeats to a higher-frequency region, some of the difficulties that would otherwise be encountered are avoided. This makes the device easy to build with noncritical circuits; it should be inexpensive to manufacture.

Published in:

IRE Transactions on Medical Electronics  (Volume:PGME-12 )