z-logo
Premium
Magnetically‐assisted remote control (MARC) steering of endovascular catheters for interventional MRI: A model for deflection and design implications
Author(s) -
Settecase Fabio,
Sussman Marshall S.,
Wilson Mark W.,
Hetts Steven,
Arenson Ronald L.,
Malba Vincent,
Bernhardt Anthony F.,
Kucharczyk Walter,
Roberts Timothy P. L.
Publication year - 2007
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.2750963
Subject(s) - deflection (physics) , catheter , scanner , imaging phantom , magnetic resonance imaging , biomedical engineering , moment of inertia , materials science , physics , surgery , radiology , optics , medicine , classical mechanics
Current applied to wire coils wound at the tip of an endovascular catheter can be used to remotely steer a catheter under magnetic resonance imaging guidance. In this study, we derive and validate an equation that characterizes the relationship between deflection and a number of physical factors: θ ∕ sin ( γ − θ ) = n I A B L ∕ E I A , where θ is the deflection angle, n is the number of solenoidal turns, I is the current, A is the cross‐sectional area of the catheter tip, B is the magnetic resonance (MR) scanner main magnetic field, L is the unconstrained catheter length, E is Young's Modulus for the catheter material, andI Ais the area moment of inertia, and γ is the initial angle between the catheter tip and B . Solenoids of 50, 100, or 150 turns were wound on 1.8 F and 5 F catheters. Varying currents were applied remotely using a DC power supply in the MRI control room. The distal catheter tip was suspended within a phantom at varying lengths. Images were obtained with a 1.5 T or a 3 T MR scanner using “real‐time” MR pulse sequences. Deflection angles were measured on acquired images. Catheter bending stiffess was determined using a tensile testing apparatus and a stereomicroscope. Predicted relationships between deflection and various physical factors were observed ( R 2 = 0.98 − 0.99 ) . The derived equation provides a framework for modeling of the behavior of the specialized catheter tip. Each physical factor studied has implications for catheter design and device implementation.

This content is not available in your region!

Continue researching here.

Having issues? You can contact us here