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Fiber Optic Sensorized Tools for Cardiology Applications

July 7th, 2008

Yong-Lae ParkSeok Chang Ryu

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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

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Atrial Fibrillation

• Atrial fibrillation is the commonest arrhythmia.

• 30,000 to 35,000 catheter ablations for AF performed in the U. S. in 2006

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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 .

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Fiber Optic Force Sensing in Ablation Catheter

• Multi-axis force sensing using embedded FBG sensors

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TactiCath from EndoSense

• Fiber optic sensor within the catheter tip

• Axial and lateral force measurement

• Sensitivity of 1g

• 10 Hz data acquisition rate

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Dynamic Tactile Sensing

• Sensing texture of heart wall to collect more information on target areas.

• Active sensing using piezo-actuator

3 mm

3 mm

1 mm

0.5 mm

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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-actuatorFBG

FBG Interrogator