Abstract
With the development of flexible electronic materials, as well as the wide development and application of smartphones, the cloud, and wireless systems, flexible wearable sensor technology has a significant and far-reaching impact on the realization of personalized medical care and the reform of the consumer market in the future. However, due to the high requirements for accuracy, reliability, low power consumption, and less data error, the development of these potential areas is full of challenges. In order to solve these problems, this review mainly searches the literature from 2008 to May 2020, based on the PRISMA process. Based on them, this paper reviews the latest research progress of new flexible materials and different types of sensors for monitoring vital signs (including electrophysiological signals, body temperature, and respiratory frequency) in recent years. These materials and sensors can help realize accurate signal detection based on comfortable and sustainable observation, and may likely be applied to future daily clothing.
Highlights
Many new health-tracking devices and smartwatches have appeared in several global electronic product consumer exhibitions
When the right leg drive circuit is connected to the human body with it, the signal quality is better compared with the wet electrode and there is no obvious power frequency noise, but with high-frequency noise the Q wave is not visible. This team [15] continued to use the flexible non-contact electrode (Figure 1f), which has no components on both sides, to collect and verify the ECG and EEG respectively
In order to meet the biocompatibility of the monitoring device as much as possible, Chen et al [93] proposed to attach biocompatible and ultra-flexible inorganic strain sensors to the skin to monitor vital signs for a long time (Figure 7c,d)
Summary
Many new health-tracking devices and smartwatches have appeared in several global electronic product consumer exhibitions. In practical clinical applications, wearable devices should ensure the accuracy of signal acquisition and ensure comfort in the process of wearing as much as possible. If a rigid sensor is used, will the wearing comfort be affected, and the signal error of some motion artifacts will be caused. This is because the rigid material does not have enough flexibility and adaptability [3]. The research progress of wearable health monitoring in materials and sensor technology at home and abroad in recent years is reviewed, and their advantages and disadvantages are highlighted.
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