Design and Kinematics of a 5-DOF Parallel Robot for Beating Heart Surgery

Abstract

In this paper, mechanical and electronics design of a lightweight 5-DOF robot, Ozyegin Surgery Robot I (OSI), and it's performance of tracking the heart motion for coronary artery bypass procedure (CABG) are presented. The OSI is designed to operate for high motion bandwidths. This ability is realized using 3 sub-mechanisms: a 3-DOF remote stage for high acceleration, a 2-DOF fixed stage for low error positioning, and a drive unit to actuate 3-DOF surgical tools. The forward and the inverse kinematics of the OSI's sub-units are also presented. The transmission ratios (gear ratios) and initial angle offsets of the robot are calibrated using an optical measurement sensor. The ability of the robot to track the beating heart motion is tested using simulations and experiments. The results show that the robot end-effector can track the heartbeat motion data with 0.66 mm error.