NDLI: Transradial Prosthetic Arm Actuated by Mechanically Advantaged Shape Memory Alloy Wires

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Transradial Prosthetic Arm Actuated by Mechanically Advantaged Shape Memory Alloy Wires

Content Provider	Semantic Scholar
Author	Vartanian, Kevin Shaer, Sarah Abu-Al Todd, Rebecca Amirbekyan, Arshak Aguilar, Christian Arjon-Ramirez, Martin David Pucio Paz, Lenny Lopez-Ramirez, David Barajas, Amelia Bishay, Peter L.
Copyright Year	2019
Abstract	INTRODUCTION Over two million people live with limb loss in the US alone, leaving many of those affected by this disability to settle for a less-than adequate lifestyle. Accordingly, many amputees tend to fall into an isolated lifestyle where depression, mental illness, and anxiety persist [1]. Prosthetic arms offer hope to those individuals by providing a solution to their lost limb, allowing them to regain functionality and live independently. Regardless of these solutions being available, 81% of amputees do not have the financial means to afford a prosthetic limb due to the exponential costs of maintenance. Individuals who do incur the financial expenses tend to not utilize the prosthetic as a result of the excessive weight [2]. Therefore, it is crucial to provide those individuals with the option of having a low cost, lightweight transradial prosthetic arm. This paper is presenting a new transradial prosthetic arm design. The fingers and forearm core structures are 3D printed, while the forearm shell is made of a composite laminate. Dual control approach is used to control the prosthetic through myoelectric sensors and voice recognition. The fingers are actuated by thermally-controlled Shape Memory Alloy (SMA) wires, which are much lighter than servo motors. The SMA wires contract by 4% of their lengths when being Joule heated, as the material transforms from Martensite to Austenite phase. The SMA wires are connected to an array of innovative “Clever-Leverand-Locking” (CLL) systems that enhance the actuation stroke and lock the fingers in their positions after actuation to maintain the desired grip without continuously drawing electric current in the SMA actuators, hence conserving power.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.csun.edu/~pbishay/pubs/SP_RMASB_2019.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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