#$%^&*AU2016204501A120170202.pdf#####ABSTRACT A method, consisting of ablating tissue for a time period, measuring a contact force applied during the 5 time period, and measuring a power used during the time period. The method further includes ceasing ablating the tissue when a desired size of a lesion produced in the tissue, as estimated using an integral over the time period of a product of the contact force raised to a 10 first non-unity exponent and the power raised to a second non-unity exponent, is reached.4/10 START 100 SELECT DESIRED LESION SIZE 102J_ BEGIN ABLATION 104 MEASURE CONTACT FORCE AND POWER WHILE ABLATING CALCULATE INTEGRAL OVER TIME OF PRODUCT OF CONTACT FORCE RAISED TO FIRST NONUNITY EXPONENT AND POWER RAISED TO SECOND NON-UNITY EXPONENT 108 USE INTEGRAL TO ESTIMATE LESION SIZE 110 ESTIMATED LESION SIZE NO CONTINUE DESIRED LESION NOABLATION SIZE 4~YES 112 CEASE ABLATION 114 END FIG- 4