An ultrasound transducer patch (100) comprises an array of ultrasound transducers (20) mounted to a flexi-PCB (10) containing multiple tracks (12). Each transducer (20), or a sub-group of the transducers is electrically connected to first and second of the multiple tracks. The flexi-PCB (10) is configured, such as by virtue of cut-out portions (114, 414) or by inherent elasticity, to be bendable a out non-parallel axes. The enables the patch (100) to readily conform to a complex 3D surface such as a portion of a patients face to ensure efficient transmission of ultrasound energy to a desired area of treatment.
