Heat cells
DCFirst Claim
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1. A heat cell comprising:
- a particulate exothermic composition comprising;
a.) from about 30% to about 80% by weight, iron powder;
b.) from about 3% to about 25% by weight, activated carbon, non-activated carbon, and mixtures thereof;
c.) from about 0.5% to about 10% by weight metal salt; and
d.) from about 1% to about 40% by weight, water;
wherein the particles of said particulate exothermic composition are combined in a pocket, formed in a unified structure comprising at least two opposed surfaces, wherein at least one surface is oxygen permeable, that when filled with said particulate exothermic composition, has a fill volume and a cell volume whereby the ratio of fill volume to cell volume is from about 0.7 to about 1.0, wherein said ratio is maintained without the use of differential pressure across the cell wall, and further wherein the apex of said heat cell has a height of from greater than about 0.2 cm to about 1.0 cm.
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Abstract
This invention relates to heat cells, based on a specific iron oxidation chemistry and having specific physical dimensions and fill characteristics. These heat cells, which can be incorporated into disposable body wraps, provide a controlled and sustained temperature for consistent, convenient, and comfortable heat application for treating temporary or chronic pain.
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22 Claims
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1. A heat cell comprising:
a particulate exothermic composition comprising; a.) from about 30% to about 80% by weight, iron powder; b.) from about 3% to about 25% by weight, activated carbon, non-activated carbon, and mixtures thereof; c.) from about 0.5% to about 10% by weight metal salt; and d.) from about 1% to about 40% by weight, water; wherein the particles of said particulate exothermic composition are combined in a pocket, formed in a unified structure comprising at least two opposed surfaces, wherein at least one surface is oxygen permeable, that when filled with said particulate exothermic composition, has a fill volume and a cell volume whereby the ratio of fill volume to cell volume is from about 0.7 to about 1.0, wherein said ratio is maintained without the use of differential pressure across the cell wall, and further wherein the apex of said heat cell has a height of from greater than about 0.2 cm to about 1.0 cm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A heat cell comprising:
a particulate exothermic composition comprising; a.) from about 30% to about 80% by weight, iron powder; b.) from about 3% to about 25% by weight, activated carbon, non-activated carbon, and mixtures thereof; c.) from about 0.5% to about 10% by weight, metal salt; and d.) from about 1% to about 40% by weight, water; wherein the particles of said particulate exothermic composition are combined in a pocket, having an elongated shape, with the long axis parallel to the film layer substrates of the unified structure comprising at least two opposed surfaces, wherein at least one surface is oxygen permeable, that when filled with said particulate exothermic composition, has a fill volume and a cell volume whereby the ratio of fill volume to cell volume is from about 0.7 to about 1.0, wherein said ratio is maintained without the use of differential pressure across the cell wall, and further wherein the width of said heat cell at its widest point is from about 0.2 cm to about 20 cm, the height at its apex of from about 0.2 cm to about 5 cm, and the length is from about 1 cm to about 20 cm. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22)
Specification