An interspinous device is designed to treat symptoms of narrowing of the lumbar canal. The interspinous device is an implant designed to keep the space between your spinous processes open, so that when standing, the nerves in your back are not pinched or cause pain. By enlarging the space between the bones of the back, the interspinous device reduces pressure on the spinal nerves, thus relieving symptoms that are usually leg pain and cramps as well as sensory disorders such as numbness or tingling of the lower part of the spine. the back, buttocks and legs.