Heating device for heating a patient's body
First Claim
1. A heating device for surface heating of a body so as to maintain a required temperature of the body, the heating device comprising an electrical heating element structure and a power source for supplying a required voltage to the heating element structure, wherein said heating element structure is constructed to enable its operation with a desired temperature of an outer surface of the heating element structure to provide as low as desired temperature gradient between the outer surface temperature of the heating element structure and the required body temperature, and substantially uniform heat transfer towards the surface of the body, the heating element structure comprising:
- first and second separate elements arranged in a spaced-apart parallel relationship along their surfaces one on top of the other with an electrical insulator between them, wherein the first element is connected to the power source when the device is put in operation and serves as a heater, and the second element, which is to be located closer to the heated body, is made of a different material of a specific resistivity lower than that of the first element and has a surface area larger than that of the first element, thus operating as a heat-diffuser providing substantially uniform distribution and transfer to the body of heat created by the first element when in operation, each of said first and second elements being configured to have a predetermined length and width such that the temperature gradient between the temperature of the outer surface of the heating element structure when in operation and said required temperature of the heated body is substantially low, at least the first element being configured as a strip arranged for compensating a magnetic field created by the first conductive element when in operation.
1 Assignment
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Accused Products
Abstract
A heating device is presented for surface heating of a body so as to maintain a required temperature of the body. The heating device comprises an electrical heating element and a power source for supplying a required voltage thereto. The heating element comprises first and second conductors, wherein the first conductor is made of a material with relatively high specific resistivity as compared to that of the second conductor, and the second conductor is made of a material with high heat conductivity. The first and second conductors are accommodated in spaced-apart parallel relationship along their lengths such that, when they are connected to the power source, electric currents flow in the conductors in opposite directions, and magnetic fields created in the vicinity of the first and second conductors are completely compensated. The first conductor thus serves as a heater and the second conductor as a heat diffuser. By accommodating the heating device such that it faces the body by the second conductor, as low as desired temperature gradient between the surface temperature of the heating conductor and the required temperature of the body can be obtained.
29 Citations
35 Claims
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1. A heating device for surface heating of a body so as to maintain a required temperature of the body, the heating device comprising an electrical heating element structure and a power source for supplying a required voltage to the heating element structure, wherein said heating element structure is constructed to enable its operation with a desired temperature of an outer surface of the heating element structure to provide as low as desired temperature gradient between the outer surface temperature of the heating element structure and the required body temperature, and substantially uniform heat transfer towards the surface of the body, the heating element structure comprising:
first and second separate elements arranged in a spaced-apart parallel relationship along their surfaces one on top of the other with an electrical insulator between them, wherein the first element is connected to the power source when the device is put in operation and serves as a heater, and the second element, which is to be located closer to the heated body, is made of a different material of a specific resistivity lower than that of the first element and has a surface area larger than that of the first element, thus operating as a heat-diffuser providing substantially uniform distribution and transfer to the body of heat created by the first element when in operation, each of said first and second elements being configured to have a predetermined length and width such that the temperature gradient between the temperature of the outer surface of the heating element structure when in operation and said required temperature of the heated body is substantially low, at least the first element being configured as a strip arranged for compensating a magnetic field created by the first conductive element when in operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A heating device for surface heating of a body so as to maintain a required temperature of the body, the heating device comprising an electrical heating element structure and a power source for supplying a required voltage to the heating element structure, wherein said heating element structure is constructed to enable its operation with a desired temperature of an outer surface of the heating element structure to provide as low as desired temperature gradient between the outer surface temperature of the heating element structure and the required body temperature, and substantially uniform heat transfer towards the surface of the body, the heating element structure comprising:
first and second separate elements arranged in a spaced-apart parallel relationship along their surfaces one on top of the other with an electrical insulator between them, wherein the first element is connected to the power source when the device is put in operation and serves as a heater, and the second element, which is to be located closer to the heated body, is made of a different material of a specific resistivity lower than that of the first element and has a surface area larger than that of the first element, thus operating as a heat-diffuser providing substantially uniform distribution and transfer to the body of heat created by the first element when in operation, each of said first and second elements being configured to have a predetermined length and width such that the temperature gradient between the temperature of the outer surface of the heating element structure when in operation and said required temperature of the heated body is substantially low, the first and second conductive elements having shapes and dimensions such that connecting of the second element to the power source results in electric currents in the first and second conductive elements being of the same magnitudes and opposite directions, thereby compensating a magnetic field created by the electrical heating element structure when in operation. - View Dependent Claims (32)
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33. A heating device for surface heating of a body so as to maintain a required temperature of the body, the heating device comprising an electrical heating element structure and a power source for supplying a required voltage to the heating element structure, wherein said heating element structure is constructed to enable its operation with a desired temperature of an outer surface of the heating element structure to provide as low as desired temperature gradient between the outer surface temperature of the heating element structure and the required body temperature, and substantially uniform heat transfer towards the surface of the body, the heating element structure comprising:
first and second separate elements arranged in a spaced-apart parallel relationship along their surfaces one on top of the other with an electrical insulator between them, wherein the first element is connected to the power source when the device is put in operation and serves as a heater, and the second element, which is to be located closer to the heated body, is made of a different material of a specific resistivity lower than that of the first element and has a surface area larger than that of the first element, thus operating as a heat-diffuser providing substantially uniform distribution and transfer to the body of heat created by the first element when in operation, each of said first and second elements being configured to have a predetermined length and width such that the temperature gradient between the temperature of the outer surface of the heating element structure when in operation and said required temperature of the heated body is substantially low, the surface area of the second element through which the heat is transferred to the body being substantially equal to the surface area of the body part to be heated. - View Dependent Claims (34)
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35. A heating device for surface heating of a body so as to maintain a required temperature of the body, the heating device comprising an electrical heating element structure and a power source for supplying a required voltage to the heating element structure, wherein said heating element structure is constructed to enable its operation with a desired temperature of an outer surface of the heating element structure to provide as low as desired temperature gradient between the outer surface temperature of the heating element structure and the required body temperature, and substantially uniform heat transfer towards the surface of the body, the heating element structure comprising:
first and second separate elements arranged in a spaced-apart parallel relationship along their surfaces one on top of the other with an electrical insulator between them, wherein the first element is connected to the power source when the device is put in operation and serves as a heater, and the second element, which is to be located closer to the heated body, is made of a different material of a specific resistivity lower than that of the first element and has a surface area larger than that of the first element, thus operating as a heat-diffuser providing substantially uniform distribution and transfer to the body of heat created by the first element when in operation, each of said first and second elements being configured to have a predetermined length and width such that the temperature gradient between the temperature of the outer surface of the heating element structure when in operation and said required temperature of the heated body is substantially low, the second element which serves as the heat diffuser has a surface area at least 5 times the surface area of the first element, said second element being at a distance spaced from the first element for being placed closer to the body to be heated while the first element is spaced from the second element and disposed further from the body to be heated.
Specification