The pump is usually about one inch thick and three inches wide. The surgeon also inserts a catheter, which carries pain medicine from the pump to the intrathecal space around the spinal cord. The implants deliver medicines such as morphine or a muscle relaxant directly to the spinal cord, where pain signals travel. Incidentally, having to be 140lbs to run sounds quite inaccurate. I’m a 5’5″ male, 155lbs, mostly muscle am I “too heavy” to run, too? Of course not.…