Suggest A Special Equipment For Physical Exercise That Can Increase Strength

My brother is 30 years old . he has been suffering in GBS disease for last two years. in 27 February,09 he feels weakness his both arms and legs. he did not take plasmapheresis and Intravenous immune globulin treatment. we are continuing physical therapy. his strength is increasing gradually but slow. is there any special equipment or physical exercise for increase his strength.