Print Email Facebook Twitter Pneumatic Pinch Force Magnification in Voluntary Closing Hand Prostheses Title Pneumatic Pinch Force Magnification in Voluntary Closing Hand Prostheses Author Bruinekool, R.A. Contributor Van der Helm, F.C.T. (mentor) Plettenburg, D.H. (mentor) Faculty Mechanical, Maritime and Materials Engineering Department BioMechanical Engineering Programme BME Date 2012-09-10 Abstract Body powered voluntary closing (VC) hand prostheses allow users to proportionally control grasping devices in a very intuitive sense using the concept of extended physiological proprioception (EPP). The operating force required for voluntary closing devices are however so high that muscle fatigue becomes a problem. The goal of this paper is to introduce a system using pneumatic power that can increase the ratio of pinch force to operating force for prosthetic hands/hooks. This system is intended to be used in a hybrid body- and pneumatically- powered manner; the prehension phase is performed solely by the user while in the pinch phase the pinch force gets provided by both the user and a pneumatic piston. The piston linearly magnifies the force input of the user by using a Force Demand Valve (FDV). Using this system, a pinch force to operating force ratio of 3 is achieved (current prosthetic hands/hooks fall in the range of 0.11-0.45). Force control tests were carried out with 9 test subjects for both the system with pneumatic force magnification and without. These tests showed there is no large degradation in force control performance when the force magnification is engaged. Subject prosthetics To reference this document use: http://resolver.tudelft.nl/uuid:a25b2e40-0a44-4814-b4d9-40214faab402 Embargo date 2012-11-05 Part of collection Student theses Document type master thesis Rights (c) 2012 Bruinekool, R.A. Files PDF Thesis_Bob_Bruinekool.pdf 3.17 MB Close viewer /islandora/object/uuid:a25b2e40-0a44-4814-b4d9-40214faab402/datastream/OBJ/view