Electrical heating pad
AssigneeKanthal Medical Heating AB
InventorLeif Graflind
Life of this patent
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Abstract
An electrical heating pad, in particular a mattress to be placed under a patient during surgery, comprising a number of partially overlapping resistor elements (11-18). The foil elements cover different regions of the pad and are positioned in an overlapping configuration such that in substantially all portions of the pad there are at least two overlapping foil element parts. Each foil element is fed separately from control circuitry so as to maintain a uniform temperature at all portions of the pad, irrespective of the heating load at different portions.
Claims12
An electrical heating pad, comprising a number of partially overlapping resistor foil elements (11-18), each such foil element having a separate pair of electrical feed terminals (11a-b, . . . , 18a-b), wherein
- (a) substantially the whole area of the pad is divided into a plurality of sub-regions;
- (b) the foil elements (11-18) are positioned in an overlapping configuration such that in each subregion (11/15, 11/16, 12/15, 12/16, 13/17, 13/18, 14/17, 14/18) of the pad there is a unique pair of overlapping foil element parts;
- and
- (c) the feed terminals (11a-b, . . . , 18a-b, respectively) of each foil element in such a pair of partially overlapping foil elements is connectable to an electrical power unit so as to permit individual sensing of the respective temperature-dependent resistance thereof, whereby the temperature of each sub-region of the pad can be monitored individually.
Dependencies are inferred from the claim text.