Enabling variable-stiffness hand rehabilitation orthoses with dielectric elastomer transducers.

Abstract:

:Patients affected by motor disorders of the hand and having residual voluntary movements of fingers or wrist can benefit from self-rehabilitation exercises performed with so-called dynamic hand splints. These systems consist of orthoses equipped with elastic cords or springs, which either provide a sustained stretch or resist voluntary movements of fingers or wrist. These simple systems are limited by the impossibility of modulating the mechanical stiffness. This limitation does not allow for customizations and real-time control of the training exercise, which would improve the rehabilitation efficacy. To overcome this limitation, 'active' orthoses equipped with devices that allow for electrical control of the mechanical stiffness are needed. Here, we report on a solution that relies on compact and light-weight electroactive elastic transducers that replace the passive elastic components. We developed a variable-stiffness transducer made of dielectric elastomers, as the most performing types of electromechanically active polymers. The transducer was manufactured with a silicone film and tested with a purposely-developed stiffness control strategy that allowed for electrical modulations of the force-elongation response. Results showed that the proposed new technology is a promising and viable solution to develop electrically controllable dynamic hand orthoses for hand rehabilitation.

journal_name

Med Eng Phys

authors

Carpi F,Frediani G,Gerboni C,Gemignani J,De Rossi D

doi

10.1016/j.medengphy.2013.10.015

subject

Has Abstract

pub_date

2014-02-01 00:00:00

pages

205-11

issue

2

eissn

1350-4533

issn

1873-4030

pii

S1350-4533(13)00236-1

journal_volume

36

pub_type

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