Electric heating pad

An electric heating pad for warming a patient comprising a heated underbody support, heated mattress or heated mattress overlay comprising:

• a flexible sheet-like heating element including an upper edge, a lower edge, and at least two side edges, the flexible sheet-like heating element configured to generate heat;
• a shell covering the flexible sheet-like heating element and comprising at least two sheets of flexible material, the at least two sheets of flexible material comprising a first sheet of flexible material that is configured to be in contact with the patient during warming, and a second sheet of flexible material that is configured to be spaced apart from the patient during warming;
• a weld coupling the first sheet of flexible material and the second sheet of flexible material together about the upper edge, the lower edge, and the at least two side edges of the flexible sheet-like heating element, wherein the weld is one of a RF weld, ultrasonic weld, or a heat bond;
• and
• a securing strip enclosed within the shell, coupled to at least the upper edge, the lower edge, or one of the at least two side edges of the flexible sheet-like heating element, the securing strip extending laterally away from the flexible sheet-like heating element and being engaged between the first sheet of flexible material and the second sheet of flexible material in the weld in order to secure the flexible sheet-like heating element within the shell;
• wherein the first sheet of flexible material and the second sheet of flexible material each include at least one layer of urethane to facilitate the one of the RF weld, the ultrasonic weld, or the heat bond.

An electric heating pad for warming a patient comprising a heated underbody support, heated mattress or heated mattress overlay comprising:

• a flexible sheet-like heating element including an upper edge, a lower edge, and at least two side edges, the flexible sheet-like heating element configured to generate heat;
• a shell covering the flexible sheet-like heating element and comprising at least two sheets of flexible material, the at least two sheets of flexible material comprising a first sheet of flexible material that is configured to be in contact with the patient during warming, and a second sheet of flexible material that is configured to be spaced apart from the patient during warming;
• a weld coupling the first sheet of flexible material and the second sheet of flexible material together about the upper edge, the lower edge, and the at least two side edges of the flexible sheet-like heating element, wherein the weld is one of a RF weld, ultrasonic weld, or a heat bond;
• and
• a securing strip enclosed within the shell, coupled to at least the upper edge, the lower edge, or one of the at least two side edges of the flexible sheet-like heating element, the securing strip extending laterally away from the flexible sheet-like heating element and being engaged between the first sheet of flexible material and the second sheet of flexible material in the weld in order to secure the flexible sheet-like heating element within the shell;
• wherein the first sheet of flexible material and the second sheet of flexible material each include at least one layer of a weldable polymeric material to facilitate the one of the RF weld, the ultrasonic weld, or the heat bond.