Wireless Fetal Monitoring Device with Provisions for Multiple Births

Cardiotocography is used to monitor the effect of contractions on fetal heart rate (FHR) and is used in the final trimester of pregnancy to detect fetal distress. This simple and efficient (patent-pending) architecture for Cardiotocography employs the Doppler technique to measure Fetal Heart Rate (FHR) and is scalable to any number of FHR monitors. The Doppler circuitry is designed for low cost and low power consumption to facilitate portability and compatibility with wireless data transmission. Measured results indicate performance consistent with conventional bedside systems, i.e. 8 bits of resolution with update rates ≥2 samples per second.