Broken patio door handle
Thanks for reaching out! To remove the internal locking mechanism, you'll need to remove the frame cover to access the screws. Unfortunately, I would not be able to confirm how your existing handle is installed to the door. Although, it is likely that the handle set is secured to the door using some variation of a screw. You'll need to take a look at the screw holes on the side of the handle to determine what tool you'll need to remove the existing handle set.
We can confirm that the 82-080 should be a fit for your sliding patio door handle set, so long as your measurements match up. The most important measurement you'll want to confirm is the distance between the installation holes.