An adjustable bed comprises a patient support surface supported by a patient support framework that adjusts vertices along the perimeter of the patient support surface. Through adjustments that raise and contract the perimeter of the patient support surface on either side of the lower torso and/or hip-area...http://www.google.ca/patents/US7886379?utm_source=gb-gplus-sharePatent US7886379 - Support surface that modulates to cradle a patient's midsection
