Asymmetric shape of distal phalanx of human finger improves precision grasping

Abstract In morphology field, the functions of an asymmetric-shaped distal phalanx in human finger have only been inferred. In this study, we used an engineering approach to empirically examine the effects of the shape of distal phalanx on the ability of precision grasping. Hence, we developed artif...

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Autores principales:	Ayane Kumagai, Yoshinobu Obata, Yoshiko Yabuki, Yinlai Jiang, Hiroshi Yokoi, Shunta Togo
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3269b8b3dc384a6bb3174283dac09bcc
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spelling	oai:doaj.org-article:3269b8b3dc384a6bb3174283dac09bcc2021-12-02T15:45:16ZAsymmetric shape of distal phalanx of human finger improves precision grasping10.1038/s41598-021-89791-32045-2322https://doaj.org/article/3269b8b3dc384a6bb3174283dac09bcc2021-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-89791-3https://doaj.org/toc/2045-2322Abstract In morphology field, the functions of an asymmetric-shaped distal phalanx in human finger have only been inferred. In this study, we used an engineering approach to empirically examine the effects of the shape of distal phalanx on the ability of precision grasping. Hence, we developed artificial fingertips consisting of four parts, namely bones, nails, skin, and subcutaneous tissue, that substitute the actual human fingertips. Furthermore, we proposed a method to evaluate the grasping ability of artificial fingers. When a cylindrical object was grasped by an artificial fingertip, a pull-out experiment was conducted. Thus, the asymmetric type was found to be superior in terms of drawing force, holding time, and work of friction than the symmetric type. Our results clearly demonstrate that the asymmetric shape, particularly the mirror-reversed shape of the distal phalanx, improves the ability of precision grasping and suggests that the human distal phalanx is shaped favorably for object grasping.Ayane KumagaiYoshinobu ObataYoshiko YabukiYinlai JiangHiroshi YokoiShunta TogoNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-10 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Ayane Kumagai Yoshinobu Obata Yoshiko Yabuki Yinlai Jiang Hiroshi Yokoi Shunta Togo Asymmetric shape of distal phalanx of human finger improves precision grasping
description	Abstract In morphology field, the functions of an asymmetric-shaped distal phalanx in human finger have only been inferred. In this study, we used an engineering approach to empirically examine the effects of the shape of distal phalanx on the ability of precision grasping. Hence, we developed artificial fingertips consisting of four parts, namely bones, nails, skin, and subcutaneous tissue, that substitute the actual human fingertips. Furthermore, we proposed a method to evaluate the grasping ability of artificial fingers. When a cylindrical object was grasped by an artificial fingertip, a pull-out experiment was conducted. Thus, the asymmetric type was found to be superior in terms of drawing force, holding time, and work of friction than the symmetric type. Our results clearly demonstrate that the asymmetric shape, particularly the mirror-reversed shape of the distal phalanx, improves the ability of precision grasping and suggests that the human distal phalanx is shaped favorably for object grasping.
format	article
author	Ayane Kumagai Yoshinobu Obata Yoshiko Yabuki Yinlai Jiang Hiroshi Yokoi Shunta Togo
author_facet	Ayane Kumagai Yoshinobu Obata Yoshiko Yabuki Yinlai Jiang Hiroshi Yokoi Shunta Togo
author_sort	Ayane Kumagai
title	Asymmetric shape of distal phalanx of human finger improves precision grasping
title_short	Asymmetric shape of distal phalanx of human finger improves precision grasping
title_full	Asymmetric shape of distal phalanx of human finger improves precision grasping
title_fullStr	Asymmetric shape of distal phalanx of human finger improves precision grasping
title_full_unstemmed	Asymmetric shape of distal phalanx of human finger improves precision grasping
title_sort	asymmetric shape of distal phalanx of human finger improves precision grasping
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3269b8b3dc384a6bb3174283dac09bcc
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Asymmetric shape of distal phalanx of human finger improves precision grasping

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