A wearable patch (10) is disclosed comprising an ultrasound transducer (30) mounted on the patch and a fluid reservoir (50) for containing a coupling agent (60) for the ultrasound transducer, said fluid reservoir being delimited by a portion (20) of the patch and a seal ring (40) extending from the patch, said seal ring surrounding the ultrasound transducer and comprising a plurality of fluid conduits (43, 45) extending from the fluid reservoir at least partially through the seal ring. Also disclosed are a wearable patch kit, assembly and application method.