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

2 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

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

4 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.

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

6 TactiCath from EndoSense Fiber optic sensor within the catheter tip Axial and lateral force measurement Sensitivity of 1g 10 Hz data acquisition rate

7 Dynamic Tactile Sensing Sensing texture of heart wall to collect more information on target areas. Active sensing using piezo-actuator 3 mm 1 mm 0.5 mm

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