Thank god someone invented the Free Lock! The Free Lock is a safe and stable gripping system for your orthosis or prosthesis. The Free Lock is an invention of the company Stel Orthopedie, in my opinion the number one company worldwide for custom solutions cyclists with a disability.
Because of a brachial plexus injury I have to use an orthosis for my left arm.
Here’s what it looks like on the bike:
My orthesis comes with a hinge which is supported by a gas damper, so when I put a little pressure on it, I can ride in the drops on my road- and gravelbike, or take on an aerodynamic position on a bike with a flatbar.
Check https://www.freelock.nl/ for more info, images and videos.