A collection of devices intended to be used in conjunction with a non-surgically invasive ultrasound transducer (probe) (e.g., of a therapeutic oncological/gynaecological ultrasound system) to cool the transducer and improve coupling. It typically consists of a container(s) with fluid (e.g., water with dissolved polymers) which circulates between a heat exchanger and the transducer via connection tubing; it may also include coupling gel and devices intended to detect patient motion during the procedure. This is a single-use device.