The ARC pen is a vibrating pen, created by Dopa Solutions, that vibrates to stimulate the hand muscles and improving writing control. This device is targeted towards Parkinson's disease patients, whose motor control degenerates in time, affecting their ability to write legibly.
The pen's large, clunky form is designed to make it easier to handle for people with Parkinson's disease. It is packed with high frequency vibration motors that stimulate muscles in the hand that are used for control, while also making it easier for users to drag the pen across paper.
Ultimately, the ARC pen does more than just help Parkinson's patients write -- it helps them retain independence for longer, which improves self-esteem and has a broad positive impact on their lives.