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Air mat for operation bed

  • US 5,881,410 A
  • Filed: 10/23/1996
  • Issued: 03/16/1999
  • Est. Priority Date: 04/28/1994
  • Status: Expired due to Fees
First Claim
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1. A method of controlling the temperature of an air mat for an operation bed capable of periodically changing a support area of a patient, comprising the steps of:

  • activating a heater for providing heat wherein the heater is on a lower surface of an air layer of the air mat;

    measuring a synthesized temperature with a sensor provided on an upper surface of the air layer of the air mat and in a region on which the patient lies, the synthesized temperature being a composite temperature of both the patient and the air layer;

    comparing the synthesized temperature with a first comparison temperature lower than a target temperature by a first predetermined temperature differential; and

    reducing drive current to the heater when the measured temperature reaches the comparison temperature.

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