Sippy Cups

Alright ya'll, my kiddo will be a year in 11 days and he still refuses to use his sippy cups. I started to offer it to him at 6 months like I did with my oldest and he had no interest in it...granted he was delayed due to a Vein of Galen malformation which is essentially a large vein is stopping his cerebral fluid from flowing...hes had 3 surgeries and is quickly making up for lost time...my question is do I keep trying with the ones I have or is there any recommendations I was curious about the 360 cups and if anyone used them.