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Logitech makes a series of track balls for people with mobility issues. There recognizable because ATT uses the same trackballs for the kiosks in their stores.
The ball is about 4" in diameter so that the palm of the hand may cusp the trackball instead of using ones fingertips. There best for people with arthritis and such, and as you didn't describe the specific mobility issue confronting this patient, i can't honestly tell you if this is what you may be seeking.
Hope this helps.
Perhaps a touch screen with enlarged resolution is in order as an alternative?
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Seen on an employer evaluation:
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