Dual-Frequency Stretchable Ultrasound Transducer Using Inversion Layer Technique

In recent years, researchers have turned their attention to dual-frequency ultrasound with superior permeation-enhancing effects. However, the large surface area and complex curvature characteristics of facial regions present challenges in fabricating dual-frequency ultrasound transducers. To address these limitations, a flexible dual-frequency ultrasound device based on inversion layer technology has been developed to achieve efficient and comfortable facial healthcare. Compared with conventional annular dual-frequency transducers, the vertical configuration enabled by inversion layer technology facilitates easier miniaturization. Furthermore, this innovative solution demonstrates a simpler fabrication process compared to methods requiring intermediate wiring within piezoelectric layers.