Patent ID: 9333033
Filing Date: 2016-05-10
CPC Classification: A61B

Claim Text:
1. A method, comprising: delivering a Radio Frequency (RF) signal having a time-varying power from an intra-body probe to tissue in a vicinity of the probe in order to ablate the tissue; measuring a temperature in the vicinity of the probe; and deciding whether the probe is in contact with the tissue by comparing the measured temperature to a temperature threshold that varies in time depending on the time-varying power of the RF signal by setting the temperature threshold depending on a fourth root of the power of the RF signal and setting a proportion coefficient between the measured temperature and the fourth root of the power of the RF signal, based on a first coefficient that links the measured temperature and the fourth root of the power when the probe is in contact with the tissue, and a second coefficient that links the measured temperature and the fourth root of the power when the probe is not in contact with the tissue.