![]() Starting from the 20th week, the fetal heartbeats can be heard without amplification, and the corresponding Fetal Heart Rate (FHR) normally ranges from about 110 to 150 beats per minute (BPM). The fetal heart activity can be monitored from the seventh week using specific devices, such as ultrasound-based ones. Among these, the heart begins to work at the fourth week of life, so, from this stage, the fetus starts to use its own bloodstream. The features of the proposed device make it simple and quick in testing a fetal heart rate monitor, thus providing an efficient way to evaluate and test the correlation capabilities of commercial apparatuses.ĭuring pregnancy, the development of the different organs usually follows phases that start in different weeks. The proposed equipment and testing respect the technical requirements for medical devices. Moreover, the performed tests and measurements show the correct functionality of the developed simulator. This value complies with the technical standard for the accuracy of fetal heart rate monitor devices. The generated frequencies show an error of about 0.5% with respect to the nominal one while the accuracy of the test equipment was within ☓% of the test signal set frequency. The accuracy of the simulated signals was evaluated, and it resulted to be stable and reliable. ![]() The simulator was designed to be compliant with the standard requirements for accurate assessment and measurement of medical devices. In the designed device, a relay element, driven by an electric signal that allows switching at two specific frequencies, is used to simulate the fetus and the mother’s heartbeat. The design and realization of the device are presented, together with the description of its features and functioning tests. In this paper, a new approach for the periodical testing and the functionality evaluation of a fetal heart rate monitor device based on ultrasound principle is proposed.
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