physical variables are listed in Table 1. The ultrasound wavesemitted by transducer pass into the tissues and are detectedusing sensors to monitor health conditions without involvingany invasive procedures [8, 9]. The mechanical sensors rely onthe mechanical vibrations, piezoresistive effect, capacitance,triboelectricity, and resistance. Additionally, these sensingcomponents are driven by mechanical deformations (pressing,bending, stretching, and twisting) of devices.