@TalkingByte - There may be real movement on this in the future. Technologies are starting to come together in this direction. Three dimensional printers might one day be able to build a machine to do this.
You can come up with a design to build a machine like this, and a 3D printer can one day generate it.
The first step is to build a working kidney though. This they are hoping to do using stem cell research. There is a lot to work out, but they may be able to someday construct these types of things.