pressure responsive instruments for use with orthotic fluid filled medical cushions and mattresses to sense the location of a user's body in relation to the base of the cushion or mattresses and signal when the body is below a predetermined point to prevent bottoming out of the user

'base':27 'bodi':22,37 'bottom':45 'cushion':11,30 'fill':9 'fluid':8 'instrument':3 'locat':17 'mattress':13,32 'medic':10 'orthot':7 'point':42 'predetermin':41 'pressur':1 'prevent':44 'relat':24 'respons':2 'sens':15 'signal':34 'use':5 'user':20,49

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