A device to alleviate lower back pain, aligning the spine in the lumbar region, stretching the spine and reducing inward curvature of the spine which is an integral, elongate, symmetrical ovoid-section rigid sheet on which the user lies in a supine position, device opening upward to receive the individual,...http://www.google.de/patents/US7288077?utm_source=gb-gplus-sharePatent US7288077 - Device and method to alleviate lower back pain
