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Extending bioelectric navigation for displacement and direction detection.

Heiko Maier1,2,3, Heribert Schunkert4,5, Nassir Navab6,7,8

  • 1Computer Aided Medical Procedures, Technical University of Munich, Boltzmannstr. 3, 85748, Garching near Munich, Bavaria, Germany. heiko.maier@tum.de.

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This study enhances bioelectric navigation for endovascular procedures by adding a stationary electrode to estimate catheter distance traveled. This improves navigation accuracy and allows tracking during bidirectional catheter movement.

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Area of Science:

  • Biomedical Engineering
  • Medical Imaging

Background:

  • Bioelectric navigation offers non-fluoroscopic guidance for minimally invasive endovascular procedures.
  • Current limitations include restricted navigation accuracy and inability to track catheters moving in alternating directions.

Purpose of the Study:

  • To extend bioelectric navigation with additional sensing capabilities for improved accuracy.
  • To enable estimation of catheter distance traveled, enhancing feature localization.
  • To allow tracking of catheters exhibiting bidirectional motion.

Main Methods:

  • Utilized finite element method (FEM) simulations and 3D printed phantom experiments.
  • Developed a stationary electrode solution for estimating traveled distance.
  • Investigated and refined the approach to mitigate effects of surrounding tissue conductance.

Main Results:

  • Successfully estimated catheter movement direction and distance traveled.
  • Simulations showed low errors (<0.89 mm) in non-conductive tissue, but higher errors (up to 60.27 mm) in conductive tissue.
  • Phantom experiments yielded a mean absolute error of 6.3 mm.

Conclusions:

  • An additional stationary electrode enhances bioelectric navigation by estimating traveled distance and direction.
  • Mitigation of conductive tissue effects requires further research for clinical application.
  • Future work should focus on reducing errors in biological tissues to acceptable clinical levels.