Iterative Jacobian-Based Inverse Kinematics and Open-Loop Control of an MRI-Guided Magnetically Actuated Steerable Catheter System

作者：Liu Taoming^*; Jackson Russell; Franson Dominique; Poirot Nate Lombard; Criss Reinhardt Kam; Seiberlich Nicole; Griswold Mark A; Cavusoglu M Cenk

来源：IEEE/ASME Transactions on Mechatronics, 2017, 22(4): 1765-1776.

DOI：10.1109/TMECH.2017.2704526

• Continuum robots
• inverse kinematics
• magnetically actuated catheter
• robotic catheter

This paper presents an iterative Jacobian-based inverse kinematics method for a magnetic resonance imaging (MRI) guided magnetically actuated steerable intravascular catheter system. The catheter is directly actuated by magnetic torques generated on a set of current-carrying microcoils embedded on the catheter tip by the magnetic field of the MRI scanner. The Jacobian matrix relating changes of the currents through the coils to changes of the tip position is derived using a three-dimensional kinematic model of the catheter deflection. The inverse kinematics is numerically computed by iteratively applying the inverse of the Jacobian matrix. The damped least square method is implemented to avoid numerical instability issues that exist during the computation of the inverse of the Jacobian matrix. The performance of the proposed inverse kinematics approach is validated using a prototype of the robotic catheter by comparing the actual trajectories of the catheter tip obtained via open-loop control with the desired trajectories. The results of reproducibility and accuracy evaluations demonstrate that the proposed Jacobian-based inverse kinematics method can be used to actuate the catheter in an open loop to successfully perform complex ablation trajectories required in atrial fibrillation ablation procedures. This study paves the way for effective and accurate closed-loop control of the robotic catheter with realtime feedback from MRI guidance in subsequent research.

• 出版日期2017-8