A patient support includes a layer of fluid pressurized bladders, the bladders each having a chamber and an upwardly facing surface for facing and supporting a patient, and a cover over the layer of fluid pressurized bladders. Respective bladders in at least a group of the bladders each have a resil
A patient support includes a layer of fluid pressurized bladders, the bladders each having a chamber and an upwardly facing surface for facing and supporting a patient, and a cover over the layer of fluid pressurized bladders. Respective bladders in at least a group of the bladders each have a resilient body in its respective chamber to reform the shape of the respective bladder when a compression load on the respective bladder is removed wherein the pressure in the respective bladders is generally maintained without a powered supply of air. The cover has an upwardly facing patient surface and a bladder layer facing surface, with the patient surface for forming a patient support surface on the support, and the bladder layer facing surface for lying on the upwardly facing surfaces of the bladders.
대표청구항▼
1. A patient support comprising: an air flow system for directing air flow into the patient support;a bladder layer formed from an upper sheet and a lower sheet joined together to form a plurality of fluid pressurized bladders, each bladder having an internal chamber and an upwardly facing surface f
1. A patient support comprising: an air flow system for directing air flow into the patient support;a bladder layer formed from an upper sheet and a lower sheet joined together to form a plurality of fluid pressurized bladders, each bladder having an internal chamber and an upwardly facing surface for facing and supporting a patient, said bladders having a network of fluid passageways between the bladders to redistribute pressure between surrounding bladders, the network of fluid passageways being adapted to maintain the fluid in the chambers at a minimum pressure and release fluid from the chambers when the collective pressure in the chambers exceeds a maximum pressure, and the network further being adapted to redistribute fluid pressure between the chambers so that when one or more of the bladders are compressed by a part of a patient's body, the increase in pressure in the fluid in the compressed bladder or bladders will be redistributed to the chambers surrounding the compressed bladder or bladders and to redistribute the increase in pressure in the surrounding bladders to their surrounding bladders so that the bladders that surround the compressed bladder or bladders will allow the patient to immerse into the bladder layer and envelope that part of the patient's body to thereby distribute the weight of that part of the patient's body over a greater contact area than just the facing surface of the bladder or bladders that are compressed by that part of the body;said bladder layer configured to allow air flow to flow from the air flow system through at least one of said sheets forming said fluid pressurized bladders external to said chambers to facilitate moisture management; anda cover over the fluid pressurized bladders, the cover having an upwardly facing patient surface and a bladder layer facing surface, the upwardly facing patient surface for forming a patient support surface on the support and forming a patient interface, and the bladder layer facing surface lying on the upwardly facing surfaces of the bladders wherein the cover and the bladder layer are free of any intermediate cushioning layer, and the cover comprising a moisture vapor permeable, but generally liquid impermeable cover to allow moisture vapor flow through the cover into a space beneath said cover and either in the bladder layer or above the bladder layer, wherein the bladder layer forms a reservoir for the moisture vapor passing through the cover, and the air flow from the air flow system directing moisture vapor to flow out of the cover at a location other than the interface so that together the cover and the bladder layer will transport away moisture from the patient's body at the interface. 2. The patient support according to claim 1, wherein each of the chambers is in fluid communication with its adjacent chambers via conduits, and the conduits forming the network of fluid flow passageways between the bladders. 3. The patient support according to claim 1, wherein each respective bladder in at least a group of the bladders has a resilient body in its respective chamber to reform the shape of the respective bladder when a compression load on the respective bladder is removed, the resilient bodies comprising foam blocks. 4. The patient support according to claim 1, wherein the upper sheet comprises an impermeable material. 5. The patient support according to claim 1, wherein the upper sheet is impermeable. 6. The patient support according to claim 1, wherein the chambers are arranged in a plurality of rows extending laterally across the support, with each of the rows having at least two of the chambers. 7. The patient support according to claim 1, wherein each upper facing surface has a rectangular perimeter. 8. A patient support comprising: an air flow system for directing air flow into the patient support;a bladder layer formed from an upper sheet and a lower sheet joined together to form a plurality of fluid pressurized bladders, each bladder having an internal chamber and an upwardly facing surface for facing and supporting a patient, said layer configured to allow air flow to flow from the air flow system through at least one of said sheets forming said fluid pressurized bladders external to said chambers to facilitate moisture management; anda cover over the fluid pressurized bladders, the cover having an upwardly facing patient surface and a bladder layer facing surface, the upwardly facing patient surface for forming a patient support surface on the support and forming a patient interface, and the bladder layer facing surface lying on the upwardly facing surfaces of the bladders wherein the cover and the bladder layer are free of any intermediate cushioning layer, and the cover comprising a moisture vapor permeable, but generally liquid impermeable cover to allow moisture vapor flow through the cover into a space beneath said cover and either in the bladder layer or above the bladder layer, wherein the bladder layer forms a reservoir for the moisture vapor passing through the cover, and the air flow from the air flow system directing moisture vapor flow out of the cover at a location other than the interface so that together the cover and the bladder layer will transport away moisture from the patient's body at the interface, wherein each of the chambers is in fluid communication with its adjacent chambers via conduits, and the conduits forming a network of fluid flow passageways between the bladders, the network of fluid passageways being adapted to maintain the fluid in the chambers at a minimum pressure and release fluid from the chambers when the collective pressure in the chambers exceeds a maximum pressure, and the network further being adapted to redistribute fluid pressure between the chambers so that when one or more of the bladders are compressed by a part of a patient's body, the increase in pressure in the fluid in the compressed bladder or bladders will be redistributed to the chambers surrounding the compressed bladder or bladders and to redistribute the increase in pressure in the surrounding bladders to their surrounding bladders so that the bladders that surround the compressed bladder or bladders will allow the patient to immerse into the bladder layer and envelope that part of the patient's body to thereby distribute the weight of that part of the patient's body over a greater contact area than just the facing surface of the bladder or bladders that are compressed by that part of the body. 9. The patient support according to claim 8, wherein the network of fluid passageways are formed between the upper sheet and the lower sheet. 10. The patient support according to claim 9, wherein the network of fluid passageways is formed by tubing between the upper sheet and the lower sheet. 11. The patient support according to claim 9, further comprising a pressure relief valve in fluid communication with the network of fluid passageways, wherein when the pressure in the chambers with resilient bodies exceeds the maximum pressure, the pressure relief valve will allow fluid to discharge from the network of fluid passageways. 12. The patient support according to claim 11, further comprising a check valve in fluid communication with the network of fluid passageways, wherein when the pressure in the chambers falls below the minimum pressure, the check valve will allow fluid to flow into the network of fluid passageways. 13. A patient support comprising: a cushioning layer formed from a plurality of discrete, spaced cushioning elements, each cushion element comprising a chamber and having an upwardly facing surface for facing and supporting a patient, said cushioning layer having a network of fluid passageways between said chambers to allow pressure redistribution between surrounding chambers, the network of fluid passageways being adapted to maintain the fluid in the chambers at a minimum pressure and release fluid from the chambers when the collective pressure in the chambers exceeds a maximum pressure, and the network further being adapted to redistribute fluid pressure between the chambers so that when one or more of the cushioning elements are compressed by a part of a patient's body, the increase in pressure in the fluid in the compressed cushioning element or cushioning elements will be redistributed to the chambers surrounding the compressed cushioning element or cushioning elements and to redistribute the increase in pressure in the surrounding cushioning elements to their surrounding cushioning elements so that the cushioning elements that surround the compressed cushioning element or cushioning elements will allow the patient to immerse into the cushioning layer and envelope that part of the patient's body to thereby distribute the weight of that part of the patient's body over a greater contact area than just the facing surface of the cushioning element or cushioning elements that are compressed by that part of the body;said cushioning layer configured to allow air flow to flow there through to facilitate moisture management; anda cover over the cushioning layer, the cover having an upwardly facing patient surface and a cushioning layer facing surface, the upwardly facing patient surface for forming a patient interface, the cushioning layer facing surface lying on the upwardly facing surfaces of the cushioning elements wherein the cover and the cushioning elements are free of any intermediate cushioning layer there between, and the cover comprising a moisture vapor permeable, but generally liquid impermeable cover to allow moisture vapor flow through the cover into a space beneath the cover and either in the cushioning layer or above the cushioning layer, wherein the cushioning layer forms a reservoir for the moisture vapor passing through the cover, and the air flow directing moisture vapor flow out of the cover at a location other than the interface so that together the cover and the cushioning layer will transport away moisture from the patient's body at the interface. 14. The patient support according to claim 13, wherein the cushioning layer comprises a gel layer. 15. The patient support according to claim 13, wherein each of the cushioning elements comprises a bladder, each bladder forming a respective chamber of said chambers. 16. The patient support according to claim 15, wherein the bladders are arranged in a plurality of rows extending laterally across the patient support, with each of the rows having a plurality of bladders, and the bladders being in fluid communication with each other to form a network of bladders. 17. The patient support according to claim 13, wherein the cushioning layer is formed by an upper sheet joined with a lower sheet, said chambers formed between the upper sheet and the lower sheet. 18. The patient support according to claim 17, wherein the upper sheet is impermeable. 19. The patient support according to claim 17, wherein the network of fluid passageways are formed between the upper sheet and the lower sheet. 20. The patient support according to claim 13, wherein each upwardly facing surface of said cushioning elements has a rectangular perimeter.
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