Tactile display for presenting stiffness distribution using magnetorheological fluid

This paper describes a tactile display for reproducing stiffness distributions based on magnetorheological (MR) fluid. This display can represent stiffness distribution by controlling the applied magnetic field locally. Computed tomography (CT) and endoscopy are currently used to diagnosis intravita...

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Autores principales:	Hiroki ISHIZUKA, Nicolo LORENZONI, Norihisa MIKI
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2014
Materias:	tactile display palpation magnetorheological fluid liquid encapsulation endoscopy tumor Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/a4d4c8c746bd44cd90a3de67436c904f
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spelling	oai:doaj.org-article:a4d4c8c746bd44cd90a3de67436c904f2021-11-26T06:09:52ZTactile display for presenting stiffness distribution using magnetorheological fluid2187-974510.1299/mej.2014fe0034https://doaj.org/article/a4d4c8c746bd44cd90a3de67436c904f2014-08-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/1/4/1_2014fe0034/_pdf/-char/enhttps://doaj.org/toc/2187-9745This paper describes a tactile display for reproducing stiffness distributions based on magnetorheological (MR) fluid. This display can represent stiffness distribution by controlling the applied magnetic field locally. Computed tomography (CT) and endoscopy are currently used to diagnosis intravital conditions. However, CT cannot detect tumors smaller than 5 mm, and endoscopy can only diagnosis the tissue surface. Since tumors are stiffer than normal tissue, endoscopic palpation may be effective for detecting tumors smaller than 5 mm located beneath the tissue surface. To perform such palpation, a tactile display that can reproduce the spatial stiffness distribution of tissue is strongly required. For intravital tissue, the display must be capable of creating stiffness values ranging from about 200 to about 600 kPa with a spatial resolution of less than 5 mm. In the present study, a tactile display is proposed that exploits the ability of a MR fluid to change its stiffness in a magnetic field. In the proposed device, the MR fluid is encapsulated in an acrylic chamber covered by a thin flexible membrane. We first characterized the mechanical properties of the device and then, conducted sensory experiments with five subjects to verify that the device could display stiffness distribution. The magnetic field was produced by a cylindrical permanent magnet with a diameter of 5 mm, and the applied field strength was controlled by varying the separation between the magnet and the display. The experimental results indicated that the proposed display could successfully recreate the stiffness distribution including stiffness of tumor tissue under a local magnetic field of 200 mT. The device was then evaluated using five subjects, who were asked to touch the device with their index fingers and estimate the size of the stiff spot. Although the results varied among subjects, all were capable of perceiving spots smaller than 5mm.Hiroki ISHIZUKANicolo LORENZONINorihisa MIKIThe Japan Society of Mechanical Engineersarticletactile displaypalpationmagnetorheological fluidliquid encapsulationendoscopytumorMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 1, Iss 4, Pp FE0034-FE0034 (2014)
institution	DOAJ
collection	DOAJ
language	EN
topic	tactile display palpation magnetorheological fluid liquid encapsulation endoscopy tumor Mechanical engineering and machinery TJ1-1570
spellingShingle	tactile display palpation magnetorheological fluid liquid encapsulation endoscopy tumor Mechanical engineering and machinery TJ1-1570 Hiroki ISHIZUKA Nicolo LORENZONI Norihisa MIKI Tactile display for presenting stiffness distribution using magnetorheological fluid
description	This paper describes a tactile display for reproducing stiffness distributions based on magnetorheological (MR) fluid. This display can represent stiffness distribution by controlling the applied magnetic field locally. Computed tomography (CT) and endoscopy are currently used to diagnosis intravital conditions. However, CT cannot detect tumors smaller than 5 mm, and endoscopy can only diagnosis the tissue surface. Since tumors are stiffer than normal tissue, endoscopic palpation may be effective for detecting tumors smaller than 5 mm located beneath the tissue surface. To perform such palpation, a tactile display that can reproduce the spatial stiffness distribution of tissue is strongly required. For intravital tissue, the display must be capable of creating stiffness values ranging from about 200 to about 600 kPa with a spatial resolution of less than 5 mm. In the present study, a tactile display is proposed that exploits the ability of a MR fluid to change its stiffness in a magnetic field. In the proposed device, the MR fluid is encapsulated in an acrylic chamber covered by a thin flexible membrane. We first characterized the mechanical properties of the device and then, conducted sensory experiments with five subjects to verify that the device could display stiffness distribution. The magnetic field was produced by a cylindrical permanent magnet with a diameter of 5 mm, and the applied field strength was controlled by varying the separation between the magnet and the display. The experimental results indicated that the proposed display could successfully recreate the stiffness distribution including stiffness of tumor tissue under a local magnetic field of 200 mT. The device was then evaluated using five subjects, who were asked to touch the device with their index fingers and estimate the size of the stiff spot. Although the results varied among subjects, all were capable of perceiving spots smaller than 5mm.
format	article
author	Hiroki ISHIZUKA Nicolo LORENZONI Norihisa MIKI
author_facet	Hiroki ISHIZUKA Nicolo LORENZONI Norihisa MIKI
author_sort	Hiroki ISHIZUKA
title	Tactile display for presenting stiffness distribution using magnetorheological fluid
title_short	Tactile display for presenting stiffness distribution using magnetorheological fluid
title_full	Tactile display for presenting stiffness distribution using magnetorheological fluid
title_fullStr	Tactile display for presenting stiffness distribution using magnetorheological fluid
title_full_unstemmed	Tactile display for presenting stiffness distribution using magnetorheological fluid
title_sort	tactile display for presenting stiffness distribution using magnetorheological fluid
publisher	The Japan Society of Mechanical Engineers
publishDate	2014
url	https://doaj.org/article/a4d4c8c746bd44cd90a3de67436c904f
work_keys_str_mv	AT hirokiishizuka tactiledisplayforpresentingstiffnessdistributionusingmagnetorheologicalfluid AT nicololorenzoni tactiledisplayforpresentingstiffnessdistributionusingmagnetorheologicalfluid AT norihisamiki tactiledisplayforpresentingstiffnessdistributionusingmagnetorheologicalfluid
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Tactile display for presenting stiffness distribution using magnetorheological fluid

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