Method and device for supply for heat

A method for monitoring the progress of heat treatment of body tissue in terms of damage to the tissue, comprising the steps of:

• a) determining a specific absorption rate (SAR) in body tissue caused by a heating device,
• b) heating said tissue by said heating device,
• c) measuring temperature in at least one location in said tissue,
• d) calculating temperature distribution in the tissue dynamically, and
• e) dynamically assessing on the basis of step d, elapsed time and known heat sensitivity of body tissue the amount of damaged tissue.

A method for supplying heat to body tissue using a heating device and a first temperature transducer which is insertable in the body tissue, including the steps of:

• a) enclosing the heating device in a catheter,
• b) connecting the heating device to an energy supply unit,
• c) measuring temperature in the body tissue with said first temperature transducer,
• d) determining temperature distribution in the body tissue on the basis of information on the measured temperature in the tissue and the distribution of energy absorption in the tissue,
• e) measuring elapsed time during which heat is supplied to the tissue, and
• f) calculating the amount of tissue destructed through energy absorption on the basis of the elapsed time and the temperature distribution.