You may have heard of Max Okun last year when a video of him working out with a prosthetic arm went viral. https://www.youtube.com/watch?v=574ibwSe-zc

I am wondering where I can find the elbow joint used by Advanced Arm Dynamics to build Max Okun a prosthetic arm for weight lifting/working out? Here's a link to a picture of the arm and elbow joint https://i2.kknews.cc/large/1b7400019b1f4583ab69

Is it possible to 3d print this joint? Is this a standard joint used in prosthetics/orthotics? Is this a standard joint used in another field? Are there any free designs available online? Anything would be helpful! Thanks in advance!