| Objective:To establish the fetal heart rate monitoring system based on the Internet of Things, pregnant women can perform fetal heart rate monitoring anywhere and anytime, simulation experiment and clinical trials to evaluate the accuracy and stability of monitoring system, as well as through clinical trials to evaluate the effectiveness of portable fetal heart monitor of monitoring system perception layer.Methods:1.Embedded microcontroller system for processing fetal heart rate and uterine pressure signal of perception layer, bluetooth for two-way data transmission and reception between smartphone and portable fetal heart monitor, smartphone application was developed by Eclipse, the application displayed fetal heart rate value, uterine pressure value, fetal heart rate curve, uterine pressure curve and battery power, as well as recorded fetal heart movement value and played fetal heart sound. Public wireless networks as the network layer of system, smartphone sent the monitoring data to service layer through standard wireless network transmission protocol. Server platform management software of service layer was developed by Eclipse, the software displayed the fetal heart monitoring information and backed the diagnosis after processing received data.2. Doppler fetal gauge for simulating fetal heartbeat and pressure weights for simulating contraction pressure, the setting of simulated fetal heart rate value, simulated pressure value and detection time point were based on Doppler fetal monitor industry standards, recording the setting values, display values of portable fetal heart monitor and display values of system server platform in each time point, calculating accuracy. 3. Choosing Full-term pregnant women as the clinical trials subjects, portable fetal heart monitor was the experimental group and clinical standard fetal heart monitor was the control group, fetal heart rate monitoring for pregnant women, recording the display values of portable fetal heart monitor, display values of standard fetal heart monitor and display values of server platform, calculating accuracy.Results:Fetal heart rate was measured by portable fetal heart rate monitor at each time in the simulation, fetal heart rate accuracy of more than 98%, the fetal heart rate detection error was less than ±2bpm/min, non-linearity error of pressure survey was between-9.1% and +7.7%, ultrasound intensity was less than 10mW/cm2. The display value of system server platform in accordance with the display value of portable fetal heart rate monitor, coincidence rate was 100%, no mulfunction during operation. There were 75 cases in clinical trials, the surveyed fetal heart rate value of experimental group was (134.04±6.46) bpm/min, the surveyed fetal heart rate value of control group was (133.83±6.51) bpm/min, two measurements had no significant difference (P>0.05), the display value of system server platform in accordance with the display value of portable fetal heart rate monitor, coincidence rate was 100%, no mulfunction during operation.Conclusions:The operation stability and detection accuracy of fetal heart monitoring system based on the Internet of Things reached the design requirements, the effectiveness of portable fetal heart monitor of monitoring system perception layer reached similar product standards, the system can be used in the perinatal fetal heart rate monitoring, and pregnant women can perform fetal heart rate monitoring anywhere and anytime, understanding the health of fetus timely. |
