血管多普勒HI DOP - NSL - BT-200V Bistos（韩国）

血管多普勒monitor是手持的超声transducer used to detect thefetal heartbeatfor产前护理. It uses the多普勒效应提供心跳的可听见模拟。一些模型还显示心率每分钟节拍（BPM）。使用此显示器有时被称为Doppler听诊. The Doppler fetal monitor is commonly referred to simply as aDoppler或者fetal Doppler. It may be classified as a form ofDoppler 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胎儿听诊器. 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.^{[citation needed]}

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:

• Manufacturer: popular manufacturers are Baby Doppler, Sonoline, Ultrasound Technologies, Newman Medical, Nicolet (purchased by Natus), Arjo-Huntleigh, and Summit Doppler (now Cooper Surgical).
• 探针类型：防水与否。防水探针用于water births.
• Probe frequency: 2-MHz或3-MHz探针。大多数从业者可以通过任何一种探针找到心率。建议对3 MHz探针检测早期妊娠的心率（8-10周gestation）。建议对超重的孕妇进行2 MHz探测。较新的Echoheart 5-MHz经阴道探针有助于妊娠早期（6-8周）的早期（6-8周）的胎儿心脏色调（FHT），以及对子宫的恢复性子宫或整个怀孕期间的患者，用于肥胖的女性。
• 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.

能够记录和分享记录的主要优点是，如果有任何疑虑，可以通过电子邮件将其通过电子邮件发送给医疗保健专业人员，以检查是否是胎儿的心率以及是否正常。通常，它们从大约12周开始工作。^{[citation needed]}

单词的使用Sonicaidfor 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.