enzaIt’s a doughnut-shaped cushion to sit on and it’s designed to prevent bedsores. You set this cushion under the regions where pressure sores often form such as the lumbosacral region, joint parts like the elbow or the heel. But recent studies show that the compression of the blood vessels can be caused by the use of the cushion, which may end up causing pressure sores. So these days, it is no longer used in clinical practice or a nursing home.