What Health problems can be solved by Fetal Doppler

Fetal Doppler are the devices used in a variety of healthcare settings to provide audible and visual information about the fetus. The unit provides quick reassurance of fetal well-being to both the mother and the healthcare worker. Fetal Doppler can easily detect fetal heart sounds throughout the pregnancy, starting as early as 9 weeks. The ability of most units to accurately calculate the fetal heart rate has also made these devices valuable diagnostic tools.

Product description

Fetal Doppler are devices that use ultrasonic waves to provide audible and/or visual information. They consist of an ultrasound-frequency electrical generator and appropriate ultrasound transducers housed in a probe that is placed on the maternal abdomen. Fetal Doppler amplify the audible frequency shift signal of the returned ultrasonic waves and deliver it to speakers or headphones; the heart rate is determined either by measuring the timing of the peaks in the Doppler signal or, more accurately, by using automated autocorrelation procedures. These devices can detect fetal heart activity as soon as 9-12 weeks after conception.

Principles of operation

Fetal Doppler transmit high-frequency sound waves either continuously or in pulses. In continuous-wave (CW) units, a crystal vibrates as an electrical current passes through it, creating and transmitting acoustic energy, while a second crystal detects echoes from structures in the body. In pulsed Doppler systems, a single crystal alternately transmits periodic bursts of ultrasonic waves and senses the echoed energy. In both systems, the reflected wave is reconverted to an electrical signal that can be used to create an audible sound or a waveform. Fetal Doppler amplify the audible frequency shift signal of the returned ultrasonic waves and deliver it to speakers or headphones; the heart rate is determined either by measuring the timing of the peaks in the Doppler signal or by using automated autocorrelation procedures