Abstract 15660: Insulated Radiofrequency Ablation Catheter
Background: Radiofrequency RF ablation utilizes low-voltage to deliver high frequency electrical energy to myocardial tissue to create permanent lesions. RF delivery systems are rudimentary in design and deliver energy at 360 degrees from the tip surface allowing for dissipation of energy. We propose a design modification to current radiofrequency ablation catheters by insulating a portion of the ablation catheter tip, which improves efficiency of RF delivery and requires less RF power.
Hypothesis: An insulated portion of the ablation catheter will concentrate the flow of energy toward the non-insulated side, increasing temperature and lesion size compared with a standard catheter.
Methods: Three catheter tips were insulated using silicone based material to cover half their surfaces. These included a 4mm, 8mm, and an open-irrigated tip catheter. The insulated catheter was compared to its standard counterpart. Energy was delivered to myocardial tissue submerged in a saline bath heated to 37°C at 20 watts (W) for 60 seconds. Measurements of lesion depth and temperatures at 3mm and 5mm depth were compared between the catheter types.
Results: At 20W, lesion depths were significantly larger for the insulated 4mm, 8 mm, and irrigated tip catheters, compared to their counterpart (Table). Peak temperatures at 3 and 5 mm depths were significantly higher for the insulated 4mm, 8 mm, and irrigated tip catheters, compared to their counterpart (Table).
Conclusion: By insulating the tip of an RF ablation, efficiency of RF delivery is increased, with larger lesion sizes and higher temperatures. Lower powers can be used with insulated catheters to create lesion depths similar to those seen with standard catheters at higher power.
Author Disclosures: J.V. Huang: None. W. Sauer: Other Research Support; Modest; Biosense Webster, Boston Scientific, Medtronic, St. Jude Medical. L. Zheng: Research Grant; Modest; Biosense Weber. W. Barham: None. D.T. Nguyen: Research Grant; Modest; Biosense Webster. Other Research Support; Modest; Boston Scientific, Medtronic, St. Jude Medical.
- © 2014 by American Heart Association, Inc.