Splints can be useful to help relieve pain and restore function. Often soft splints are the more appropriate option as they are less restrictive, especially when the base of the thumb is affected.
Sometimes it can also be useful to use a wrist brace for shorter periods of time. The Otto Bock range have some splint specifically made for the rheumatoid hand, which have plastic insert in them rather than metal stays. This give the brace a bit more flexibility and also increases comfort.
This wrist brace is called Manu Rheuma Flex 4024 from Otto Bock
The silver ring is from Silver Ring Splint.