Design of MobIle Digit Assistive System (MIDAS): A Passive Hand Extension Exoskeleton for Post Stroke Rehabilitation
Stroke often causes flexor hypertonia as well as weakness of finger extension. This limits functionality of the hand degrading independent ability to perform upper limb activities of daily living (ADL’s). Hand rehabilitation post stroke is vital to regaining functionality in the affected limb, leading to improved independence and quality of living. In this paper the development of DigEx and MIDAS passive arm orthoses are detailed. A quick-change cam system is implemented featuring one-handed cam swapping. This provides the ability to vary assistance levels to improve usability and independence for the user. Pulleys and bearings are added to reduce friction caused by mechanical contacts and material failure. Initial tests with the prototype are promising.
Special thanks to Jeremiah Schroeder for developing the cam synthesis scripts, the DigEx design team, Bridger Hopkins and Jeremiah Schroeder, for their initial redesign efforts, and Saebo Inc. for the donation of the SaeboFlex.
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