Photoacoustic-Enabled RF Ablation Catheters for Lesion Monitoring

Abstract

Atrial fibrillation is a cardiac arrhythmia stemming from abnormal electrical conduction/impulse formation in the atria. To restore cardiac rhythm an RF ablation (RFA) procedure, interrupting aberrant electrical patterns, is commonly performed. One way of improving the procedure (current success rate 60%) is to enable visual feedback on lesion progression, thereby reducing complications linked to over-ablation and mitigating recurrent conductivity due to under-ablation. To visualize the ablation process, we propose photoacoustic (PA) imaging using an ablation catheter for light delivery and an ICE (Intracardiac Echo) catheter for signal reception In this work, we demonstrate two PA-enabled ablation catheters which provide sufficient optical intensity to image fresh and ablated porcine tissue ex vivo.