The present invention relates to a temperature probe measuring the skin temperature of a patient at an injury or post-surgery site, a cold therapy unit cooling the patient at the site to reduce pain and swelling, and a safety shut off switch for powering off the cold therapy unit when the skin temperature drops below a threshold temperature. When the skin temperature drops below the threshold temperature, the cold therapy unit is shut off by opening the switch. When the skin temperature rises to or above the threshold temperature, the cold therapy unit is powered on again.
