Design of an automatic optical system to measure anthropometric hand parameters
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SHORT ORIGINAL PAPER
Design of an automatic optical system to measure anthropometric hand parameters Matteo Bianchi1 · Alessandro Ridolfi1 · Nicola Secciani1 · Michaela Servi1
· Yary Volpe1
Received: 4 March 2020 / Accepted: 23 September 2020 © The Author(s) 2020
Abstract Personalized medicine is an effective tool to improve the quality of rehabilitation and treatment for patients with disabilities. This study deals with the development of a low-cost hand scanner for the acquisition of anthropometric measures. The data acquired by the scanner is used, thanks to the developed procedure, to tailor the dimensions of a hand exoskeleton. The exoskeleton is used for assistive and rehabilitation purposes. Keywords Hand scanner · 3D scanning · Anthropometric measurements · Depth sensor · Hand model
1 Introduction The development of human–machine interfaces customized according to the user needs and anatomical features has proved to be a fundamental element in human–computer interaction. The development of reverse engineering [3] and additive manufacturing technologies has provided the tools for designing and fabricating complex personalized components. Dealing with medical devices, specifically, the possibility of tailoring their dimensions according to the patient’s anatomy plays a major role towards the achievement of a higher quality of treatment [4]. Its importance is even higher in case of patients affected by disabilities, as such medical devices need to cope with strict standards in terms of safety, comfort and wearability. This study dealt with the problem of developing an effective and automatic process for the generation of customized hand exoskeleton systems
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Michaela Servi [email protected] Matteo Bianchi [email protected] Alessandro Ridolfi [email protected] Nicola Secciani [email protected] Yary Volpe [email protected]
1
Department of Industrial Engineering, University of Florence, Via di S. Marta 3, 50139 Florence, Italy
(HESs) for rehabilitation and assistive purposes. The authors have developed a prototypal version of the HES that has been tested on a limited number of patients with satisfying results [1]. In order to test it in a larger number of cases, an automatic process for the generation of the CAD models of the component personalized w.r.t. the patient’s measures must be developed. The components of the HES have been modelled in a parametric CAD modeller so that their configuration can be updated by tweaking a limited number of parameters. This study focuses on the development of an automatic scanner for the acquisition of the anthropometric measures of the hand required to customize the HES components.
2 Hand exoskeleton modelling The exoskeleton is composed of a frame, placed upon the back of the hand, where motors and controls are fixed, and four finger mechanisms, actuated by a cable transmission. The thumb finger is not actuated by this model of HES. The only components that need to be tailored to the hand shape and dimensions are the components of the mechanic
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