Scanning microwave hyperthermia with feedback temperature control
US4632127A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 17, 1985 |
| Grant date | Dec 30, 1986 |
| Priority date | — |
| Expiry date | Jun 17, 2005 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61N5/02
- WIPO fieldMedical technology
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.