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The Thermo-STAT is designed to non-invasively treat hypothermic patients by rewarming their body core. This is accomplished with local application of negative pressure and a thermal load (heat) to a distal appendage.

The Thermo-STAT is a non-invasive and portable body core warming device which provides a noninvasive technique to treat and prevent hypothermia. The Thermo-STAT's principle of action for counteracting hypothermia is to create a thermal pipeline between the skin and the body core. The Thermo-STAT functions by applying a combination of heat and pressure to only the distal aspect of an arm or leg. Using the Thermo-STAT, a thermal load is exchanged between the application site and the body core. Vasoconstriction in a hypothermic individual prevents superficial heat alone from effectively altering the body core temperature. The Thermo-STAT circumvents this "vasoconstrictive blockade" with a slight negative pressure (40-60mmHg) and enables a thermal load to be transferred directly and exclusively from a thermal heat pad to the body core via the bloodstream. Current means, such as forced air rewarming, fail to effectively overcome the "vasoconstrictive blockade."