Compact flexible actuator based on a shape memory alloy for shaping surgical instruments

Author:

Fischer Nikola1ORCID,Mathis-Ullrich Franziska2

Affiliation:

1. Institute for Anthropomatics and Robotics (IAR), Karlsruhe Institute of Technology (KIT) , 76131 Karlsruhe , Germany

2. Department Artificial Intelligence in Biomedical Engineering (AIBE) , Friedrich-Alexander University Erlangen-Nürnberg (FAU) , 91052 Erlangen , Germany

Abstract

Abstract Conventional flexible actuators for minimally invasive interventions come with complex and bulky actuation infrastructure. We present a proof-of-concept study of a compact flexible actuator with variable shape change featuring shape memory alloy wire loops in active-antagonist configurations for a bending and S-shape. The actuator was fabricated using heat-treated wire loops. The evaluation using optical marker tracking revealed a mean maximum absolute displacement at the distal tip of 19 mm and a force of 90 mN reached in under 15 s. For control, a closed-loop regime was evaluated with steady-state errors below 2°.

Publisher

Walter de Gruyter GmbH

Subject

Electrical and Electronic Engineering,Computer Science Applications,Control and Systems Engineering

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