发明名称 PASSIVE FETAL HEART MONITORING SYSTEM
摘要 <p>A fetal heart monitoring system and method for detecting and processing acoustic fetal heart signals transmitted by different signal transmission modes. One signal transmission mode, the direct-contact mode, occurs in a first frequency band when the fetus is in direct contact with the maternal abdominal wall. Another signal transmission mode, the fluid propagation mode, occurs in a second frequency band when the fetus is in a recessed position with no direct contact with the maternal abdominal wall. The second frequency band is relatively higher than the first frequency band. The fetal heart monitoring system and method detect and process acoustic fetal heart signals that are in the first frequency band and in the second frequency band.</p>
申请公布号 WO2001060251(A2) 申请公布日期 2001.08.23
申请号 US2001004602 申请日期 2001.02.14
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