Flexible Sphere\nElastomer Structural Pressure Sensor\nfor Non-invasive Pulse Wave Monitoring

Pulse wave is considered a vital physiological signal\nin the effective\nprevention and diagnosis of cardiovascular diseases, which remain\nthe leading cause of human mortality. Developing flexible and non-invasive\npressure sensors for detecting subtle pressure changes in blood vessels\nhas garnered significant attention globally. Here, a flexible and\nsphere elastomer structural triboelectric pressure sensor is developed\nwith the characteristics of great sensitivity, decent durability,\nand fast response time for continuous and non-invasive monitoring\nof epidermal pulse waves. Leveraging the sphere elastomer structure\non the tribolayer, the contact area significantly enhances the pressure\nsensor, resulting in an impressive sensitivity of 1.62 V kPa<sup>–1</sup> and a swift response time for real-time pulse monitoring. Furthermore,\nthe sphere elastomer structure endows the function of a stable supporting\ncomponent in the sensor exhibiting excellent mechanical durability\n(>20000 cycles). Due to such merits, the pressure sensor is capable\nof recognizing pulse signals with detailed information in real-time.\nMeanwhile, the flexible pressure sensor enables capture human pulse\nwaves at different positions and exercise conditions, making it highly\nversatile in practical applications. Overall, our proposed pressure\nsensor represents a significant advancement in non-invasive pulse\nmonitoring for the assessment and diagnosis of cardiovascular diseases\nand reveals the potential applications in wearable medical electronics.