Heart rate of the fetus begins at the 5th week and increases by 3,3 bpm per day during the following months. from the 9th week), it is still possible to use the Fetal doppler with a probe that is emitting pulses with a frequency of 3 MHz. Nevertheless, even in this period (approx. It is mainly caused due to the low level of ultrasonic waves reflected from the heart of the fetus in the first trimester, but also to the high degree of the waves subdued by the mother's abdominal wall. Usually, the Fetal doppler is capable to reliably detect the fetal heartbeat from approximately the twelfth week of pregnancy. Generally, frequencies of 1 MHz, 1,5 MHz, 2 MHz a 2,5 MHz are used for fetal monitoring. It was replaced by the pulse radiation of the ultrasound waves, which is more considerate to both the mother and the fetus. Nowadays, continuous radiation of the ultrasound waves is not used anymore. The base unit can also provide a visual image (such as a digital display) of fetal heart sounds. The Doppler shift, is as the base unit converted into an audible signal. Therefore, if this given wall is also the wall of the fetal heart, the Doppler shift reflects the movement of the cardiac atria and ventricles. The magnitude and sign (direction) of the Doppler shift changes with the instantaneous velocity of the wall reflecting the sound waves. If the fetus is present, the movements of its heart along with the movement of blood through the cardiac atria and ventricles will be manifested in the frequency shift ("Doppler shift") of the waves reflected from the given area. Part of this wave is reflected to the probe. After the probe activates, an ultrasonic signal is emitted through the wall of the abdomen. In practice, a hand-held probe is placed against the abdomen of a pregnant woman with the probe end pointing towards the place, where the fetus is believed to be. an electronic base unit capable of converting electronic signals from the probe into an audible response that can be perceived by the human ear.hand-held probe which contains one or more ultrasonic transducers or transducer field for the generation and detection of ultrasonic waves.Power source: 2 x AAA 1.Physical principle and use.Ultra-sound gel would help, but not necessary. Use baby oil or body lotion to get better signal.Lean the probe downward toward the public bone to get a better reception.Ask your doctor or ultrasound tech to help you to locate the heartbeat.As the fetus grows, move the probe higher to search for the heartbeat. During early pregnancy, place the probe just above the public bone where most likely you can find the fetus headbeat.Integrated design - ultrasonic probe is integrated with main unit. This unit is not intended to replace a doctor's visit nor to do self diagnostics. Remember that your doctor is the best source for information and your wellbeing. The heartbeat sound can be recorded with an audio recorder and you can email the sound files to the grandparents and good friends, and share your joy. With Baby Sound A ultrasound fetal Doppler, you can listen to heart beats and record them to your PC as the baby grows you can hear the heartbeat rate decreases from 155/195 bpm to 120/170 bpm as the baby develops you can see how your baby responds to different stimuli. This portable device is also suitable for obstetricians and midwives. It can not only reduce the expectant mother's anxiety but also allow other members of the family to listen to the baby heartbeat. It is suitable for expectant mother to carry out regular checks on her baby in between routine hospital checks. Baby Sound A Fetal Doppler is a safe and easy to use baby heartbeat monitor that has been specially designed for use at home, allowing pregnant women to listen to their unborn baby's heart beats, movements and hiccups from as early as 10 to 12 weeks.
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