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A Modular Force-Controlled Robotic Instrument for Minimally Invasive Surgery – Efficacy for Being Used in Autonomous Grasping Against a Variable Pull Force Publisher Pubmed



Khadem SM1, 2 ; Behzadipour S1 ; Mirbagheri A3 ; Farahmand F1, 2
Authors
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Authors Affiliations
  1. 1. Mechanical Engineering Department, Sharif University of Technology, Tehran, Iran
  2. 2. Research Centre for Biomedical Technologies and Robotics (RCBTR), Tehran University of Medical Sciences, Iran
  3. 3. Medical Physics and Biomedical Engineering Department, School of Medicine and Research Centre for Biomedical Technologies and Robotics (RCBTR), Tehran University of Medical Sciences, Iran

Source: International Journal of Medical Robotics and Computer Assisted Surgery Published:2016


Abstract

Background: Many deficiencies of minimally invasive robotic surgery systems can be eliminated by using automated laparoscopic tools with force measurement and control capability. Method: A fully modular, automated laparoscopic instrument with a proximal force sensory system was designed and fabricated. The efficacy of the instrument was evaluated experimentally when functioning in an autonomous force-controlled grasping scheme. Results: The designed instrument was shown to work easily with standard laparoscopic tools, with the whole distal part detachable for autoclave sterilization. The root mean squared error (RMSE) of the actual pinch force from the target ramp was 0.318 N; it was 0.402 N for a sinusoidal pull force, which dropped by 21% using a static friction compensation. A secure grasping condition was achieved, in spite of this error, by applying a sufficiently large margin from the slip boundary. Conclusions: With a simple and practical design, the instrument enjoys affordability, versatility and autoclave sterilizability for clinical usage, with an acceptable performance for being used in an auto-grasping control scheme. Copyright © 2016 John Wiley & Sons, Ltd. Copyright © 2016 John Wiley & Sons, Ltd.
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