Protective Gloves for bmx / trials I'm just back from hospital!

I was having fun in a skatepark with my trials bike, and something quite unfortunate happened. Basically, my thumb flexed the wrong way around. 

That won't stop me though, and I plan to go back as soon as the doctor allows.

But I wish I could protect my fingers, at least from flexing the wrong way around. 

Is there any glove or bandage that could help me?
It sounds like you have a kind of injury that is common in skiing. What happens is the ski pole handle gets trapped under the thumb when falling, causing the thumb to bend the wrong way. You can find supports such as this one. I can't speak for that one specifically, but if you look up "skier's thumb" on the internet you should be able to find lots of information on the injury and ways to prevent it.

Also, something like a rollerblade wrist guard might do the job, but I'm not sure how well you could grip the handlebars with something like that.