Print Email Facebook Twitter High cable forces deteriorate pinch force control in voluntary-closing body-powered prostheses Title High cable forces deteriorate pinch force control in voluntary-closing body-powered prostheses Author Hichert, M. (TU Delft Biomechatronics & Human-Machine Control) Abbink, D.A. (TU Delft Human-Robot Interaction; TU Delft Biomechatronics & Human-Machine Control) Kyberd, P.J. (University of New Brunswick; University of Greenwich) Plettenburg, D.H. (TU Delft Biomechatronics & Human-Machine Control) Date 2017 Abstract Background It is generally asserted that reliable and intuitive control of upper-limb prostheses requires adequate feedback of prosthetic finger positions and pinch forces applied to objects. Bodypowered prostheses (BPPs) provide the user with direct proprioceptive feedback. Currently available BPPs often require high cable operation forces, which complicates control of the forces at the terminal device. The aim of this study is to quantify the influence of high cable forces on object manipulation with voluntary-closing prostheses. Method Able-bodied male subjects were fitted with a bypass-prosthesis with low and high cable force settings for the prehensor. Subjects were requested to grasp and transfer a collapsible object as fast as they could without dropping or breaking it. The object had a low and a high breaking force setting. Results Subjects conducted significantly more successful manipulations with the low cable force setting, both for the low (33% more) and high (50%) object's breaking force. The time to complete the task was not different between settings during successful manipulation trials. Conclusion High cable forces lead to reduced pinch force control during object manipulation. This implies that low cable operation forces should be a key design requirement for voluntaryclosing BPPs. Subject ProstheticsStiffnessArmsHandsForearmsClassical mechanicsProprioceptionShouldersOA-Fund TU Delft To reference this document use: http://resolver.tudelft.nl/uuid:72d5d4bf-d4dd-4ddd-97a7-6ab38da792b8 DOI https://doi.org/10.1371/journal.pone.0169996 ISSN 1932-6203 Source PLoS ONE, 12 (1) Part of collection Institutional Repository Document type journal article Rights © 2017 M. Hichert, D.A. Abbink, P.J. Kyberd, D.H. Plettenburg Files PDF journal.pone.0169996.pdf 920.05 KB Close viewer /islandora/object/uuid:72d5d4bf-d4dd-4ddd-97a7-6ab38da792b8/datastream/OBJ/view