Systems and methods for assessing ablation lesions

A lesion assessment system for assessing an ablation lesion formed at a target cardiac tissue site, the system comprising:

• a mechanical probe operable to impart, through direct physical contact with the target cardiac tissue site, a mechanical force to the target cardiac tissue site, the mechanical probe comprising at least one sensor configured to measure, through the direct physical contact with the cardiac tissue site, a mechanical response of the target cardiac tissue site to the mechanical force imparted to the target cardiac tissue site;
• and
• a controller communicatively coupled to the mechanical probe and configured to:
• determine systolic and diastolic stiffness values of the target cardiac tissue site based on the measured mechanical response to the mechanical force;
• and
• determine a transmurality value of the ablation lesion based on the determined systolic and diastolic stiffness values.