Patent ID: 6913571

Claim:
A patient warming apparatus, said patient warming apparatus comprising a base having a patient platform on which a patient is adapted to be positioned, a heater mounted to the base and having a heater element adapted to direct heat toward the patient platform to warm a patient lying thereupon, a controller for controlling the electrical energy applied to the heater element to control the heat therefrom, a voltage sensor to directly determine the voltage of the electrical energy across the heater element, a current sensor to directly determine the current passing through the heater element, said controller adapted to use only those measured values of the voltage sensed by the voltage sensor and the current sensed by the current sensor to directly determine the power delivered to the heater element, an input to set the desired power to be supplied to the heater element, and a controller to establish the power delivered to the heater element to be the desired power to the heater element.