a statically balanced and bi-stable compliant end effector combined with a laparoscopic 2dof robotic arm

a statically balanced and bi-stable compliant end effector combined with a laparoscopic 2dof robotic arm

;J. Lassooij;N. Tolou;G. Tortora;S. Caccavaro;A. Menciassi;J. L. Herder
advances in medical education and practice 2012 Vol. 3 pp. 85-93
141
lassooij2012mechanicala

Abstract

This article presents the design of a newly developed 2DoF robotic arm with a novel statically balanced and bi-stable compliant grasper as the end effector for laparoscopic surgery application. The arm is based on internal motors actuating 2 rotational DoFs: pitch and roll. The positive stiffness of the monolithic grasper has been compensated using pre-curved straight guided beams that are preloaded collinear with the direction of actuation of the grasper. The result is a fully compliant statically balanced laparoscopic grasper. The grasper has been successfully adapted to a robotic arm. The maximum force and stiffness compensations were measured to be 94% and 97% (i.e. near zero stiffness) respectively. Furthermore, the feasibility of adjusting for bi-stable behavior has been shown. This research can be a preliminary step towards the design of a statically balanced fully compliant robotic arm for laparoscopic surgery and similar areas.

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Ref Key: lassooij2012mechanicala
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164087
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