Fiber Optic Sensorized Tools for Cardiology Applications July

Fiber Optic Sensorized Tools for Cardiology Applications July 7 th, 2008 Yong-Lae Park Seok Chang Ryu 1

Catheter Ablation • Technique used to treat cardiac arrhythmia (an abnormal heart rhythm). • Destroys parts of the electrical pathways causing the arrhythmias. • Radiofrequency ablation • Cryotherapy ablation 2

Atrial Fibrillation • Atrial fibrillation is the commonest arrhythmia. • 30, 000 to 35, 000 catheter ablations for AF performed in the U. S. in 2006 3

Need for Contact Force/Tactile Sensing • Contact force is one of the crucial factors which determine the lesion size. • A large survey reported (8745 patients) a complication rate of 6%. • 20% of the complications were caused by a perforation of the heart. 4

Fiber Optic Force Sensing in Ablation Catheter • Multi-axis force sensing using embedded FBG sensors 5

Tacti. Cath from Endo. Sense • Fiber optic sensor within the catheter tip • Axial and lateral force measurement • Sensitivity of 1 g • 10 Hz data acquisition rate 6

Dynamic Tactile Sensing 3 mm 1 mm 3 mm 0. 5 mm • Sensing texture of heart wall to collect more information on target areas. • Active sensing using piezo-actuator 7

Phase Locked Loop (PLL) Feedback Control • Lock the vibration frequency at resonant frequency • IFOS I-Sense can measure FBG signal at higher than 5 k. Hz. FBG Interrogator FBG Piezoactuator 8