A system for mitigating the development of decubitous ulcers. The system comprises an inflatable support (10) having a plurality of inflatable cells for providing pressure relief to a person resting on the support. The system also includes a distributor device (35) for controlling ingress and egress of fluid to the cells (14, 20) of the support. The distributor has a fluid intake (38) and fluid inlet and outlet ports (40, 42) and is operable selectively to cause pressurized fluid to be supplied from the fluid intake to one or more inlet ports to cause inflation of one or more cells of the inflatable body while causing fluid simultaneously to be exhausted from one or more outlet ports to cause deflation of one or more other of the cells in one mode of operation. In another mode the distributor is operable to cause selected inlet ports to be supplied with pressurized fluid from the intake so that selected cells receive fluid to a predetermined pressure sequentially while causing fluid simultaneously to be exhausted from one or more exhaust ports. In another mode of operation the distributor causes all the ports, and thus cells, to be put in communication with the fluid intake and with one another and further may be actuated to cause all the ports to be isolated from the fluid intake so that all the cells can deflate.Linvention concerne un système destiné à limiter le développement descarres de décubitus. Le système comprend un support gonflable (10) contenant une pluralité de cellules gonflables destinées à réduire la pression pour une personne qui repose sur le support. Le système comprend également un dispositif de distribution (35) destiné à réguler lentrée et la sortie dun fluide dans les cellules (14, 20) du support. Le distributeur comprend une prise de fluide (38) et des ports dentrée et de sortie de fluide (40, 42) et peut être exploité sélectivement de manière à ce quun fluide sous pression soit alimenté à partir de la prise de fluide vers un ou plusieurs por
