Toward a solution to the snapping problem in a concentric-tube continuum robot: Grooved tubes with anisotropy | IEEE Conference Publication | IEEE Xplore

Toward a solution to the snapping problem in a concentric-tube continuum robot: Grooved tubes with anisotropy


Abstract:

The concentric-tube continuum robot generates distal end motions by translating and rotating the proximal ends of pre-curved tubes that overlap concentrically. This robot...Show More

Abstract:

The concentric-tube continuum robot generates distal end motions by translating and rotating the proximal ends of pre-curved tubes that overlap concentrically. This robot does not require additional actuators along the tubes because the overall curvature and distal end position are determined solely by interactions between the inner and outer tubes. However, under certain conditions, the rotation of the distal end is hindered as the actuation energy accumulates into torsional energy of the tubes. As the distal ends are rotated further, the accumulated energy from the twisting is suddenly released, which makes the tubes snap to a remote position. This is called the snapping problem, and it considerably limits the performance of the robot. In this paper, we propose a novel design for the concentric tubes to eliminate the snapping problem. The new design creates groove patterns on superelastic nitinol tubes to make the tubes more flexible to bending than twisting. Simulations and experiments were performed to verify that the tubes with our groove patterns had anisotropic structural characteristics, and video image analysis verified that this structural property can eliminate the snapping problem. A concentric-tube robot with this new tube design can have a larger workspace area because tubes with greater curvatures can be used without the snapping problem.
Date of Conference: 31 May 2014 - 07 June 2014
Date Added to IEEE Xplore: 29 September 2014
Electronic ISBN:978-1-4799-3685-4
Print ISSN: 1050-4729
Conference Location: Hong Kong, China
Citations are not available for this document.

I. Introduction

Recently, there has been intensive research on the concentric-tube continuum robot, so called active cannulas or steerable needle for minimally invasive surgery (MIS) [1] ~[7]. The most distinctive characteristic of this type of robot is that its distal end is steered and advances through rotation and translation of the pre-curved tubes relative to each other. Actuators are attached to the proximal ends of the tubes, and no other actuators are required such as pull-wires or pneumatic pumps [8], [9]. Therefore, the position of the robot's distal end and the robot's shape along it length can be controlled purely by rotating and translating the base of the tubes. This implicit actuating unit and the structural simplicity allow for small-scale design and give the robot great potential to be used as a new MIS instrument that incorporates the advantages of different types of conventional tools [10].

Cites in Papers - |

Cites in Papers - IEEE (29)

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