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A Soft Robotics Nonlinear Hybrid Position/Force Control for Tendon Driven Catheters
Minou Kouh Soltani,Sohrab Khanmohammadi,Farzan Ghalichi,Farrokh Janabi-Sharifi 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.1
Minimally invasive steerable catheters, commonly implemented in cardiac ablation, are currently operatedby interventionalists exposing them to X-ray radiation and requiring the dexterity for accurate steering. Toconduct robot-assisted cardiac ablation, highly accurate stable control platform for precise force/position controlon the moving tissue is required. This paper introduces hybrid force/position control strategy to apply a constantforce to the cardiac tissue while tracking the desired trajectory. The position controller is based on a nonlinearmodel predictive tracking control satisfying the input constraints. Cosserat rod theory is incorporated for the distalshaft modeling of tendon-driven catheters, and the model is reformulated for controller design and stabilityproof. Lyapunov-based stability analysis is conducted. To apply the controller, the force-displacement mapping ofthe cardiac tissue is obtained through ex vivo experimental tests. The performance of the controller is evaluated,and the catheter is capable of regulating the force with the RMSE of 4.9 mN and tracking the position with theRMSE of 0.89 mm. The promising results verify the potential of the application of the introduced approach in realapplications including in vitro and clinical cardiac ablation.