A support that uses gravity and the patient's own body weight to produce traction for lumbar reduction is in the form of a vest worn around the patient's chest and including weight supporting arm rests attached to the vest, so the elbows and forearms can be rested thereon to partially support the patient's...http://www.google.sh/patents/US4896659?utm_source=gb-gplus-sharePatent US4896659 - Gravity lumbar traction device
