A multi-armed adjustable target to help stroke victims perform a series of tasks while being measured for mobility and range

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A research lab in the University of Pittsburgh Department of Occupational Therapy was trying to get a better measure of how stroke affects a victim's mobility. As Mechanical Design Lead, I worked on a team of three to create a system for the lab where subjects could go through three tests: picking up a soda can, turning a doorknob, and pointing to a target, all in nine different locations in a circle. As subjects completed each task, the lab put tracking sensors at different points on their arms to measure mobility.

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Due to the large range of size and ability of each subject, the system had to be very adjustable. I designed a base frame that could slide forwards and backwards and up and down rapidly, by just loosening a few thumb screws. For the radial adjustment, I designed a system with removable target systems, a different one for each test, that could be easily hooked onto the main support at incremental distances from the center.

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I fabricated six different target systems so the lab could have easy availability to any of the tests at the same time. I fabricated them all using laser cutting and engraving, as well as CNC Routing for a support system.

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Because there were three different tests each subject had to complete, I had to design and fabricate three different target systems for each test. I designed each 3D target to be made by interlocking laser cut pieces, using screws and trapped nuts to hold each target together.