NITINOL-based actuator for device control even in high-field MRI environment

Marco Kalmar, Axel Boese, Ivan Maldonado, Rainer Landes, Michael FriebeIntelligente Katheter Inka, Otto-von-Guericke University Magdeburg, Magdeburg, GermanyCorrespondence: Marco Kalmar Otto-von-Guericke-University, Universitaetsplatz 2, Magdeburg 39106, GermanyTel +49 391 675 7025Email mar...

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Autores principales:	Kalmar M, Boese A, Maldonado I, Landes R, Friebe M
Formato:	article
Lenguaje:	EN
Publicado:	Dove Medical Press 2019
Materias:	interventional MRI MRI compatible high-field magnet actuator injector Medical technology R855-855.5
Acceso en línea:	https://doaj.org/article/8812ee519b7b49b9a3031bccf6f6a697
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spelling	oai:doaj.org-article:8812ee519b7b49b9a3031bccf6f6a6972021-12-02T03:01:15ZNITINOL-based actuator for device control even in high-field MRI environment1179-1470https://doaj.org/article/8812ee519b7b49b9a3031bccf6f6a6972019-08-01T00:00:00Zhttps://www.dovepress.com/nitinol-based-actuator-for-device-control-even-in-high-field-mri-envir-peer-reviewed-article-MDERhttps://doaj.org/toc/1179-1470Marco Kalmar, Axel Boese, Ivan Maldonado, Rainer Landes, Michael FriebeIntelligente Katheter Inka, Otto-von-Guericke University Magdeburg, Magdeburg, GermanyCorrespondence: Marco Kalmar Otto-von-Guericke-University, Universitaetsplatz 2, Magdeburg 39106, GermanyTel +49 391 675 7025Email marco.kalmar@ovgu.deBackground: The magnetic resonance imaging (MRI) environment with its high-strength magnetic fields requires specialized and sometimes sophisticated solutions for otherwise simple problems. One of these problems is MR-compatible actuator mechanisms that transfer a signal into an action.Purpose: Normal actuators are based on a magnetic effect (eg, relays) and will typically not work in magnetic fields exceeding 1000 G, eg, inside the bore of an MR scanner. To enable the use of clinical devices inside the MRI, eg, for interventional procedures, there is a need for fully compatible actuators.Patients and methods: Various actuators were compared for the purpose as a simple on-off switch within an MRI. NITNOL wire as an actuator showed the highest potential because of its simplicity and reliability. We tested the possible force achieved by the NITINOL wire related to the respective energy consumption, to provide a travel range of 2 mm.Results: Compared to other actuators, the NITNOL wire is cheaper and requires less space. In the switching process however, there is a delay due to the time required for the heating of the wire up to the transformation temperature. The NITINOL switch shows a reliable behavior with regard to the generated force and the switching path over the entire measurement. Significant artifacts, caused by the NITNOL wire could not be detected in the MRI.Conclusion: NITINOL wires can be repeatedly used, are relatively easy to implement and could be an economic alternative to other more complicated actuator technologies.Keywords: interventional MRI, MRI compatible, high-field magnet, actuator, injectorKalmar MBoese AMaldonado ILandes RFriebe MDove Medical Pressarticleinterventional MRIMRI compatiblehigh-field magnetactuatorinjectorMedical technologyR855-855.5ENMedical Devices: Evidence and Research, Vol Volume 12, Pp 285-296 (2019)
institution	DOAJ
collection	DOAJ
language	EN
topic	interventional MRI MRI compatible high-field magnet actuator injector Medical technology R855-855.5
spellingShingle	interventional MRI MRI compatible high-field magnet actuator injector Medical technology R855-855.5 Kalmar M Boese A Maldonado I Landes R Friebe M NITINOL-based actuator for device control even in high-field MRI environment
description	Marco Kalmar, Axel Boese, Ivan Maldonado, Rainer Landes, Michael FriebeIntelligente Katheter Inka, Otto-von-Guericke University Magdeburg, Magdeburg, GermanyCorrespondence: Marco Kalmar Otto-von-Guericke-University, Universitaetsplatz 2, Magdeburg 39106, GermanyTel +49 391 675 7025Email marco.kalmar@ovgu.deBackground: The magnetic resonance imaging (MRI) environment with its high-strength magnetic fields requires specialized and sometimes sophisticated solutions for otherwise simple problems. One of these problems is MR-compatible actuator mechanisms that transfer a signal into an action.Purpose: Normal actuators are based on a magnetic effect (eg, relays) and will typically not work in magnetic fields exceeding 1000 G, eg, inside the bore of an MR scanner. To enable the use of clinical devices inside the MRI, eg, for interventional procedures, there is a need for fully compatible actuators.Patients and methods: Various actuators were compared for the purpose as a simple on-off switch within an MRI. NITNOL wire as an actuator showed the highest potential because of its simplicity and reliability. We tested the possible force achieved by the NITINOL wire related to the respective energy consumption, to provide a travel range of 2 mm.Results: Compared to other actuators, the NITNOL wire is cheaper and requires less space. In the switching process however, there is a delay due to the time required for the heating of the wire up to the transformation temperature. The NITINOL switch shows a reliable behavior with regard to the generated force and the switching path over the entire measurement. Significant artifacts, caused by the NITNOL wire could not be detected in the MRI.Conclusion: NITINOL wires can be repeatedly used, are relatively easy to implement and could be an economic alternative to other more complicated actuator technologies.Keywords: interventional MRI, MRI compatible, high-field magnet, actuator, injector
format	article
author	Kalmar M Boese A Maldonado I Landes R Friebe M
author_facet	Kalmar M Boese A Maldonado I Landes R Friebe M
author_sort	Kalmar M
title	NITINOL-based actuator for device control even in high-field MRI environment
title_short	NITINOL-based actuator for device control even in high-field MRI environment
title_full	NITINOL-based actuator for device control even in high-field MRI environment
title_fullStr	NITINOL-based actuator for device control even in high-field MRI environment
title_full_unstemmed	NITINOL-based actuator for device control even in high-field MRI environment
title_sort	nitinol-based actuator for device control even in high-field mri environment
publisher	Dove Medical Press
publishDate	2019
url	https://doaj.org/article/8812ee519b7b49b9a3031bccf6f6a697
work_keys_str_mv	AT kalmarm nitinolbasedactuatorfordevicecontroleveninhighfieldmrienvironment AT boesea nitinolbasedactuatorfordevicecontroleveninhighfieldmrienvironment AT maldonadoi nitinolbasedactuatorfordevicecontroleveninhighfieldmrienvironment AT landesr nitinolbasedactuatorfordevicecontroleveninhighfieldmrienvironment AT friebem nitinolbasedactuatorfordevicecontroleveninhighfieldmrienvironment
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NITINOL-based actuator for device control even in high-field MRI environment

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