Research proposes photonic skin sensing network for cardiovascular health monitoring

Soft wearable devices are well suited to monitoring physiological signals such as electrocardiogram signals, phonocardiogram signals, and pulse waves with the advantages of real-time operation capability, skin-like mechanical properties, and high-SNR sensing capability. However, the human cardiovascular system is complicated and distributed with network circulation.

The distributed optical fiber sensing technique represented by the fiber Bragg grating is ideally suited for spatiotemporal hemodynamic monitoring. Its spatially distributed multichannel sensing capability, excellent temporal synchronization and lack of electromagnetic interference lay a foundation for multiple high-SNR physiological signal monitoring.

Flexible packaging technology has been used to address the mechanical mismatch. Nevertheless, excessive thick encapsulation and the low sensitivity of commercial FBG devices pose an obstacle in detecting subtle physiological signals, thereby limiting their potential applications in wearable devices. The technique employs microfiber and ultra-thin flexible packaging technology to prepare skin-like microfiber patches. By effectively reducing the equivalent modulus of the device and the cross-sectional area of the microfiber, the stress response of the patch is improved by two orders of magnitude . It also shows great repeatability and stability under 10,000 stress circles.

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