Research And Implementation Of Short-distance Wireless Communication Technology In Fetal Monitoring

The fetal monitor is mainly used for perinatal care, in order to detect intrauterine hypoxia and distress in time. Traditional fetal monitor is generally constituted of a host, wired fetal heart rate (FHR) probes and uterine contraction (TOCO) probes, and the host is connected to center monitoring station via wired networks. During the monitoring, the pregnant women lie on the bed with FHR probes and TOCO probes attached in bandages, which are wired to the host of the monitor. Since the wires and cables are twined and tangled, there is very limited space for the pregnant to move freely, and it also takes them long time to keep a fixed posture that may cause physical discomfort. The changes of posture may cause the pulling of such cables and wires and displacement of the probes which ultimately lead to failure of monitoring. Besides, since the fetal monitor is connected to the host via wired network, it is not possible to realize real‐time monitoring when changing bed.Based on adequate research of the current short‐distance communication technology and the testing conditions of realistic comparative study, this paper has proposed the design of multi‐channel wireless monitoring network and wireless probe network, which realizes the system structure of double layer wireless networking, in order to solve the existing problems of wired network and probes in practical application. The first layer is wireless monitoring probe system that emancipates the pregnant from probe cables and wires. The second layer is the network between the monitor and center station that realizes the monitoring on the move. Based on the multi‐channel operating mode, the multi‐channel wireless monitoring networks adopt the dynamic selection and switching mechanism with an indoor single hop coverage radius of30meters and a network coverage of tens to hundreds of meters, and advantages such as high transmission rate, huge network capacity, strong anti‐interference capability and good scalability. The wireless probes adopt an integral design of preset circuits which have been integrated with ultrasound Doppler FHR detection circuits, wireless communication circuits,900mAh lithium battery and its management system. The wireless probes, which are of small volume, light weight and low transmitting power, can reliably and continuously function for8hours within a15‐meter circle of the host of the fetal monitor.