Abstract: Provided herein are wearable harnesses for securing and positioning an ultrasound device on a subject. The wearable harnesses can be used to position an ultrasound transducer to a human body. The wearable harnesses may include two adjustable shoulder straps, an adjustable waist strap, a pocket for holding a power pack, and a pocket for holding the transducer. For example, the pocket for holding the transducer may be positioned over the subject's spleen such that the ultrasound transducer may be positioned over the subject's spleen. Provided herein is also a treatment unit to be used to the wearable harness, that includes an ultrasound transducer; and a mechanical lens comprising a plurality of concentric rings and configured to adjust ultrasonic waves emitted by the ultrasound transducer.