1, look at the manual indicators
The maximum integrated sensitivity of the fetal heart rate instrument, the national standard is greater than 90db, high-quality fetal heart rate instrument is generally greater than 100db, this indicator indicates that the amplification of the signal. Frequency deviation, the national industry standard for the deviation of 10%, while the quality of the fetal heart monitor deviation of 5%.
2, look at the transmitting frequency
Generally believe that the ultrasound probe transmitting power per unit area is less than 3MW to ensure safety, the market fetal heart rate probe operating frequency is generally 1MHZ, 2MHZ, 2.5MHZ, 2.8MHZ, and so on several types. If you want to detect early pregnancy fetal heart, the probe frequency should be controlled in 2MHZ or 2MHZ below, because 2MHZ ultrasound frequency has the best penetration ability, but also has the best resolution, known as the industry's gold frequency, but also become the mainstream frequency of the fetal heart instrument.
3, see whether the waterproof
Waterproof fetal heart rate monitor can avoid combinations, olive oil or sweat, etc. lead to equipment failure, to a certain extent, can also be avoided to detail breeding.
4, look at the quality of the interface
The quality of the connecting wires and interfaces between the host and the probe are prone to malfunction if not well-designed, strong, durable and maintenance-free wire, is an important indicator of the choice of fetal heart rate monitor.
5, look at the power supply
Fetal cardiometers have AC and DC dual-use both ways, and the latter is generally equipped with rechargeable batteries, high-capacity rechargeable batteries, charging a charge, you can work for a longer period of time.
6, look at the fetal heart display
Fetal heart rate value can directly display the value, if so, it is convenient for doctors or parents to quickly determine, improve efficiency and accuracy.
What to pay attention to when buying a fetal heart rate monitor
1, radiation is very harmful to the mother-to-be and the fetus, so special attention should be paid. In the purchase of fetal heart rate monitor, it is best to use the radiation tester to test the instrument first, to ensure that its radiation intensity in the safe range.
2, pay attention to the quality of the speakers, sound good speakers can ensure that the output from the mother to extract a high-fidelity effect. Speaker sound should be clear, it is best to have the function of anti-external sound interference.
3, pay attention to check the appearance of the product, product workmanship should be fine, smooth lines, no stains, impurities, no burrs, cracks and other defects in the appearance.
4, should choose a simple, intuitive, easy to operate fetal heart rate monitor. For example, the fetal heart instrument should be with an electronic display, can see the fetal movement figures, curve parameters, preferably intelligent analysis of the results, which is both convenient and hassle-free.
5, there are some low-priced products claimed by the U.S. FDA verification and other foreign monitoring, consumers can not blindly believe. In fact, China's products to pass the verification of foreign countries generally only need to pick a sample to test can be, because it is, after all, in the domestic sales, foreign medical institutions do not regulate it.