Five-degree-of-freedom manipulation of an untethered magnetic device in fluid using a single permanent magnet with application in stomach capsule endoscopy. (January 2016)

• Record Type: Journal Article
• Authors: Mahoney, Arthur W.; Abbott, Jake J.
• Is Part Of: International journal of robotics research. Volume 35:Number 1/2/3(2016:Jan.)
• Page Start: 129
• Page End: 147
• Publication Date: 2016-01
• Subjects: Magnetic manipulation -- capsule endoscopy -- medical robotics; Robots -- Periodicals; Robots, Industrial -- Periodicals; 629.89205
• DOI: 10.1177/0278364914558006
• Languages: English
• ISSNs: 0278-3649

Abstract

This paper demonstrates magnetic three-degree-of-freedom (3-DOF) closed-loop position and 2-DOF open-loop orientation control of a mockup magnetic capsule endoscope in fluid with a single permanent magnet positioned by a commercial 6-DOF robotic manipulator, using feedback of only the 3-DOF capsule position measured by a localization system, with application in capsule endoscopy of a fluid-distended stomach. We analyze the kinematics of magnetic manipulation using a single permanent magnet as the end-effector of a serial-link robot manipulator, and we formulate a control method that enables the capsule's position and direction to be controlled when the robot manipulator is not in a kinematic singularity, and that sacrifices control over the capsule's direction to maintain control over the capsule's position when the manipulator enters a singularity. We demonstrate the method's robustness to a reduced control rate of 25 Hz, reduced localization rates down to 30 Hz, deviation in the applied magnetic field from that expected, and the presence of manipulator singularities. Five-DOF manipulation of an untethered magnetic device has been previously demonstrated by electromagnetic systems only.