2010 Design of Medical Devices Conference Abstracts

Design of a Compliant Steerable Arthroscopic Punch PUBLIC ACCESS

[+] Author and Article Information
Tin Y. Nai, Gabrielle J. M. Tuijthof

Department of Biomechanical Engineering, Delft University of Technology

Just Herder

Delft University of Technology

J. Med. Devices 4(2), 027525 (Aug 10, 2010) (1 page) doi:10.1115/1.3443298 History: Published August 10, 2010


Meniscectomy is a medical procedure where ruptured meniscal tissue is removed within the knee joint. The conventional cutters fail to reach the entire meniscus. Therefore, the focus of this study is to create a steerable joint, which allows sideway steering of the tip to increase the reachability within the knee joint. Additionally, the steerable joint is required to be robust to transmit a cutting force of up to 190 N. The mechanism design is divided into the functions: steering and actuating cutting mechanism. The most promising solution of these functions was combined and resulted in the use of a crossed configuration of a compliant rolling-contact element for the instrument joint. Flexural steering beams actuate the rotation of the joint using the principle of a parallelogram mechanism. The prototype has a range of motion of +25deg and 22deg with a steering stiffness at the handle side of 33Nmm/rad. An axial load of 200 N on the tip corresponded with a parasitic deflection of 4 deg. This unique type of steerable instrument shows potential to be functional in meniscectomy due to the great robustness of the joint.

Copyright © 2010 by American Society of Mechanical Engineers
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