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Heating system for an operating table

  • US 5,138,138 A
  • Filed: 07/26/1990
  • Issued: 08/11/1992
  • Est. Priority Date: 02/03/1988
  • Status: Expired due to Fees
First Claim
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1. A heating system for an operating table comprising a multi-layer heating pad (2) comprising at least one heating segment (12a, 12b, 12c, 12d), each segment being adapted for being electrically heated, said heating pad being pervious to X-rays and having means for connection to control and regulating unit means (3) for controlling and/or regulating electrical heating current necessary for achieving an adjustable temperature, said heating pad (2) having a heating conductor (16) comprising a resistor (18) having a specific electrical resistance and means defining a helical pattern of winding of the resistor about a carrier (17) made from an electrically non-conductive material, for enabling said heating conductor to stretch in an axial direction, said non-conductive material having rubber-elastic mechanical properties in the temperature range of between 10°

  • celsius and 200°

    celsius, said heating pad (2) being formed from different layers, each layer intimately bonded to form a composite material, said heating conductor (16) being embedded in a first layer (13) and having a thickness not more than 10% to 20% greater than an outer diameter of the heating conductor (16), said first (13) layer being surrounded by a second layer (14) of silicone rubber, said first and second layers (13,

         14) having largely identical material properties, and fabric layer means (15) disposed between the first and second layers (13,

         14) and forming a composite structure with the first and second layers, for limiting elastic expansion of the first and second layers, the total thickness of the said heating pad (2) being about 5 mm in the area of the heating segments and about 8 mm in a marginal area.

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