Abstract
This document describes the design and construction of a mechanical device that allows a subject with ectrodactyly to perform a power grip. For this purpose, the coupled bar mechanism for the emulation of a finger is presented, and a system that allows, from a single movement, to perform a large diameter grip, considering design variables obtained from anthropometric and goniometric measurement techniques. This is complemented by kinematic and static analysis, in which the position and force behaviours required in the design are verified. Then, the final construction scheme is carried out by means of computer-assisted design (CAD) software, in which the position behaviour of the distal phalanx end is obtained and compared with the models obtained in Linkage and Matlab. Finally, the work conclusions are presented.
Highlights
The term ectrodactyly derived from the Greek ektroma and daktylos, is manifested as an autosomal dominant hereditary disorder with incomplete penetrance and variable expressivity, which modifies the gen TP63 and the chromosomes 2, 7, 10, or X (Jindal, Parmar, & Gupta, 2009), (Sutton, & Van Bokhoven, 1993), (Kalathia, Seta, & Parmar, 2013)
This document aimed at developing the kinematic models and computer-assisted design (CAD) software simulations of a bar mechanism for the construction of a hand that allows the generation of large diameter power grips, according to Cutkosky's taxonomy
As for fingers 1 to 4, these must go from a state of extension to flexion from the angular variation of 0° to 90°, according to the hand goniometry; in the design the increase of each phalanx is made by one degree measured with respect to the previous one, this allows the fingers to reach the closing position in the same time interval
Summary
The term ectrodactyly (lack of fingers) derived from the Greek ektroma (abortion) and daktylos (finger), is manifested as an autosomal dominant hereditary disorder with incomplete penetrance and variable expressivity, which modifies the gen TP63 and the chromosomes 2, 7, 10, or X (Jindal, Parmar, & Gupta, 2009), (Sutton, & Van Bokhoven, 1993), (Kalathia, Seta, & Parmar, 2013). In Colombia, congenital anomalies generate more than 30% of the disability in the general population, which includes congenital cardiopathies (15.73 in 10,000 live births), Down's syndrome (17.82 in 10,000 live births), cleft lip and palate, and neural tube closure defects For their follow-up, the national public health surveillance system and the SIVIGILA information subsystem created a congenital defect notification in which the pathologies presented by newly born in the city of Bogotá are recorded. The main contribution of this work is the development of a prosthesis for a person with ectrodactyly that requires power gripping using the existing fingers on the right hand since currently there are no devices on the market that can be coupled for this type of pathology Since this malformation is rare, the designs must be customized considering the type of defect (U or V), the fingers that are missing, and the hand size
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