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Figure 4. Clinical applications of wearable devices for tissue mechanics characterization. (A) Left: User request access using FENG-based microphone for voice code recognition. Right: Sound wave of voice code. Reproduced with permission^[41]. Copyright 2017, Springer Nature; (B) Left: Photographs of a piezoelectric device mounted on the forearm to map the lesion regions of dermatologic malignancy. Right: Spatial mapping of modulus corresponding to measurements on the forearm. Reproduced with permission^[29]. Copyright 2015, Springer Nature; (C) Left: Illustration of the ultrasound sensor mounted on the neck for measurement of pulse waveform from CA, external jugular vein (ext. JV) and internal jugular vein (int. JV). Right: pulse waveforms of ECG and BP at the artery to assess vascular stiffness accessibly and reliably. Reproduced with permission^[20]. Copyright 2018, Springer Nature; (D) Left: Photographs of an autonomous sensor holding on the mouse. Right: Closely correlation between resistance readouts from the sensor and the tumor volume. Reproduced with permission^[76]. Copyright 2022, American Association for the Advancement of Science; (E) Left: Photograph of the device (chest and limb units) on a neonate in a NICU isolette, with exemplary data displaying on a user interface. Middle: Representative data collected by chest and limb units. Right: Rotational angles between the device and reference frames for a neonate in NICU in different body positions. Reproduced with permission^[77]. Copyright 2020, Springer Nature. FENG: Ferroelectric nanogenerator; CA: carotid artery; ECG: electrocardiogram; BP: blood pressure; NICU: neonatal intensive care unit.