A magnetically quasi-transparent tool for ankle passive mobilization in investigations on cortical involvement using MEG

S. Viscuso, S. Pittaccio, F. Zappasodi, F. Tecchio

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Passive mobilization of the paretic limbs is commonly part of standard care in the first stages after stroke, but at this moment it is not clear whether this can positively impact brain reorganization and functional recovery. Applying passive mobilization during MEG measurements poses the question of finding a way to provide repeatable cycles of movement without interfering too much with the biosignal acquisition. This paper presents SHADE, an active orthosis that promotes ankle dorsiflexion and fulfils these requirements by using shape memory alloy wire actuators. These alloys are very deformable at room temperature but can recover large deformations and generate considerable forces when heated above a characteristic temperature. Heating is provided by Joule's effect, cooling by natural convection. Since current is provided by a dc-generator, only limited and easily removable magnetic noise is produced. SHADE was tested in a MEG shielded room to evaluate both orthosis performance and sensorimotor cortical involvement during passive mobilization induced in 7 healthy subjects (30.3±6.9y/o). The measurements could be cleaned from any noise produced by SHADE and suitably analyzed to describe the activation patterns of primary sensorimotor areas devoted to the ankle control. The cerebral involvement in these regions during the use of SHADE was significantly different from rest. This suggests that passive stimulation with SHADE could have clinical implications and possibly a role in the recovery of active functionality in stroke patients.

Original languageEnglish
Title of host publicationIFMBE Proceedings
Pages410-413
Number of pages4
Volume25
Edition7
DOIs
Publication statusPublished - 2009
EventWorld Congress on Medical Physics and Biomedical Engineering: Diagnostic and Therapeutic Instrumentation, Clinical Engineering - Munich, Germany
Duration: Sep 7 2009Sep 12 2009

Other

OtherWorld Congress on Medical Physics and Biomedical Engineering: Diagnostic and Therapeutic Instrumentation, Clinical Engineering
CountryGermany
CityMunich
Period9/7/099/12/09

Keywords

  • Actuator
  • Ni-Ti
  • Shape memory
  • Stroke

ASJC Scopus subject areas

  • Bioengineering
  • Biomedical Engineering

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    Viscuso, S., Pittaccio, S., Zappasodi, F., & Tecchio, F. (2009). A magnetically quasi-transparent tool for ankle passive mobilization in investigations on cortical involvement using MEG. In IFMBE Proceedings (7 ed., Vol. 25, pp. 410-413) https://doi.org/10.1007/978-3-642-03885-3-114