Fetal Doppler – NSL – Sonoline C Contec (China)

ADoppler fetal monitor是手持的超声传感器用于检测fetal heartbeat为了prenatal care。It uses theDoppler effectto provide an audible simulation of the heart beat. Some models also display the心率in beats per minute (BPM). Use of this monitor is sometimes known asDopplerauscultation。多普勒胎儿监护仪通常简单地称为Doppler或者fetal Doppler。它可能被归类为一种Doppler ultrasonography(although usually not technically- 图but rather sound-generating).

多普勒胎儿监测器提供有关胎儿类似的信息fetal stethoscope。One advantage of the Doppler fetal monitor over a (purely acoustic) fetal stethoscope is the electronic audio output, which allows people other than the user to hear the heartbeat. One disadvantage is the greater complexity and cost and the lower reliability of an electronic device.^{[需要引用]}

The device was invented in 1958 by Dr. Edward H. Hon,^[1]该设备最初旨在由医疗保健专业人员使用，供个人使用。

Dopplers for home or hospital use differ in the following ways:

• 制造商：受欢迎的制造商是婴儿多普勒，Sonoline，Ultrasound Technologies，Newman Medical，Nicolet（由Natus购买），Arjo-Huntleigh和Summit Doppler（现为Cooper Surgical）。
• Probe type: waterproof or not. Waterproof probes are used forwater births。
• Probe frequency: 2-MHz或3-MHzprobes. Most practitioners can find the heart rate with either probe. A 3-MHz probe is recommended to detect a heart rate in early pregnancy (8–10 weeks妊娠). A 2-MHz probe is recommended for pregnant women who are overweight. The newer EchoHeart 5-MHz transvaginal probes aids in the detection of fetal heart tones (FHT) early in pregnancy (6–8 weeks) and for patients who have a retroverted uterus or throughout pregnancy for FHT detection for women who are obese.
• Heart rate display: some Dopplers automatically display the heart rate on a built-in LCD; for others the fetal heart rate must be counted and timed by the practitioner.

A major advantage of being able to record and share the recording is that it can be emailed to a healthcare professional to be checked if there are any concerns about whether or not it is the fetus’s heart rate and whether or not is normal. Typically, they work from about 12 weeks.^{[需要引用]}

The use of the wordSonicaid为了Doppler fetal monitors comes from the products of the UK companySonicaidLtd. Sonicaid products included the D205/206 portable fetal Dopplers and FM2/3/4 series of fetal monitors. The company was acquired by Oxford Instruments in 1987 to form Oxford Sonicaid.