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Abstract #0650

Actively-tracked metallic electrophysiology catheters and guidewires with miniature floating radio-frequency traps: Theory, Design and Validation

Ehud J Schmidt1, Eric S Meyer1, Ronald D Watkins2, Hassan Elahi1, Wolfgang Loew3, Jeffrey Schweitzer4, Gregory Olson4, Aravindan Kolandaivelu1, and Henry R Halperin1

1Cardiology, Johns Hopkins University, Baltimore, MD, United States, 2Radiology, Stanford University, Stanford, CA, United States, 3Radiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, United States, 4Abbott Inc., Saint Paul, MN, United States

Metal-reinforced catheters have improved steerability and pushability. Currently, long (>wavelength/8) metallic-braided or metallic-tube-reinforced active MRI-compatible devices do not exist, due to risks of heating of surrounding tissue. Metallic-backbone devices may be possible if heating-sources are attenuated. Concentric-tube RF traps were miniaturized (“MBaluns)” by using leaky (loosely-wound) solenoids in-place of the external tube, providing transverse magnetic fields to attenuate (a) surface electric-fields on metals and (b) common-mode propagation on internal-cables. We validated (1) a 1.1mm outer-diameter (OD) active metallic-tube-based guidewire and (2) a 2.6mm OD metallic-braid-based electrophysiology catheter via; Electromagnetic modeling, Network-Analyzer electrical tests, phantom imaging and navigation into swine hearts.

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