Gosh, that reminded me of back in the late 60's/early 70's I worked for an electronics company and two clever Doctors had approached us to design and build a machine similar to the one you described, it had to be done in secrecy because they were frightened some-one might steal their idea.
The machine was about 2 foot by 2 foot by 1 foot high with large electric conducting rubber pads attached to the machine by large thick cables, it weighed about 50lbs because of all the electronic components that needed to be involved to get this 'wonder' to work.
To make it portable it was built onto a large platform which looked like a crude supermarket trolley.
The whole thing looked like a cross between a defribulator and some sort of supply for an electric chair, so as not to burn the skin the pads could only be used with special jelly applied to the contact points.
How modern technology has changed things over the years.
