These are canvas bags filled with a hydrophilic substance and stored in a thermostatically controlled cabinet of water between 75OC to 80OC. The packs vary in size and shape and are returned to the cabinet for reheating after use. The area to be treated should be totally covered by the pack, which is moulded to the contour of the body. Layers of towels must be placed round the pack to separate it from the patient’s skin. The superficial tissues are heated by conduction, relieving pain and muscle spasm.
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