Scanning microwave hyperthermia with feedback temperature contro

Surgery – Body protecting or restraining devices for patients or infants – Restrainers and immobilizers

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219 1055R, 219 1055F, 374121, A61N 500

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active

046321276

ABSTRACT:
An electromagnetic or microwave hyperthermia method includes an antenna and a noncontacting temperature sensor such as an infrared sensor or a radiometer which together scan a predetermined path over the surface of tissue to be treated. The temperature sensor senses temperature of the tissue, and a controller closes a feedback loop which adjusts the microwave power applied to the antenna in a manner which raises the temperature of the tissue uniformly. An apparatus for accomplishing the method includes an X-Y controller which scans a rectilinear path over the patient or a portion thereof, carrying a loop antenna oriented with its axis normal to the surface to be heated. A noncontacting temperature sensor is carried coaxially aligned with the loop to prevent erroneous temperature indications as the distance of the antenna and temperature sensor assembly from the patient varies. A controllable attenuator is coupled between a microwave generator and the antenna. A controller responsive to the temperature sensor and to a preset temperature adjusts the attenuator in a feedback manner to establish a preselected uniform temperature.

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