SAM device (experimental): a removable structure, fixed to the horizontal frame of the medical bed, equipped with a handle to assist the sitting-up process
DeviceThe patients will use the experimental device during 7 days straight as well as the comparator during 7 days straight. The order in which they will use each device will depend on the groupe they have been randomized in : - Groupe 1 : Experimental device during 7 days then control device during 7 days - Groupe 2 : Control device during 7 days then experimental device during 7 days