FM5000C - FM5000PLUS
Maternal/Fetal Monitor
simultaneously and continuously; faster or lower sometimes; simple circuit; can not recognize the distance of
the target; likely to include other noise; large transmitting power; small effective receiving area (transducer).
UltrasoundTransmittingUltrasound
Receiving
UltrasoundTransmitting
Mother’s Abdomen
Depth
Figure14-1Continuous
Wave Transmitting/Receiving
Pulse wave working mode: small transmitting power; large effective receiving area (transducer); can receive
the ultrasound signals of a selected depth; can eliminate other interference and noise; complex circuit.
The transmitting frequency used for fetus
monitoring
is usually 1MHz~3MHz. A higher
(or lower)
transmitting frequency will lead to a weaker (or stronger) penetrability and a higher (or lower) resolution for
tissue structure. Therefore, the transmitting
frequency of the ultrasound transducer used for superficial
vascular disease diagnosis can reach 810MHz. According to national safety standards, the transmitting
power of the ultrasound transducer should not exceed 10MW/cm
2
;
affected adversely.
otherwise the fetus tissue could be
14.2 FHR Monitoring
14.2.1
Connect the FHR Transducer
(1) Let the patient lie on her back with the belt placed under her back, and then use the FHR transducer to
find the position of the fetal heart.
(2) Apply conductive gel to the contact surface of the transducer to ensure the largest FHR monitoring area.
Before applying the transducer to the pregnant woman, please apply conductive gel to the middle 2/3 part
of the contact surface. The conductive gel will be pressed to cover the whole contact surface (shaded
part in Figure 14-2) after the transducer is fixed to the pregnant woman’s abdomen.
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General