Difficulty getting in and out of tub - solutions?

I can get into the tub. When my back hurts I need to take a bath.

I can think of an electric hoist attached to the ceiling and the swing attached to that with a rubber or plastic seat that can take me from a standing position to the bottom of the tub so I can take a hot bath and then take me from sitting on the bottom of the tub to an almost standing position.

I could almost make it myself just using a hoist and the vinyl rope rubber see the swing. but that's not acceptable to my caseworker.

It has to be professionally done.

Do you know anybody or anything that can help me with this?