Difficulty walking to the bathroom. Does anyone know of some sort of mobility chair, like a wheelchair but smaller and more maneuverable?

My wife has been having more and more difficulty walking to the bathroom. I always help her by holding both arms and walking backwards to the bathroom. We don't really walk, it is more of a shuffle. It is only about 20 feet from the couch to the toilet passing through 2 doorways. The wheelchair that we have is too large to maneuver through the doorways and make a right turn.
Does anyone know of some sort of mobility chair like a wheelchair but smaller and more maneuverable? Please let me know because I would like to keep taking care of my wife for as long as possible. Thank you.