The present invention relates to devices and methods for supporting a user sitting upon a surface. More particularly, the present invention relates to devices and methods for supporting a user via a support utilizing individual cushioning pods in combination with a fluid filled pad incorporated into a platform such as a cushion for increasing user comfort as well as preventing and treating conditions such as pressure ulcers.
Individuals who are forced to sit or lie down for extended periods of time typically experience tissue necrosis over localized regions of their body known as decubitus ulcers or pressure sores. In 2009 more than a million people in acute care centers were affected with pressure ulcers. In addition to acute care centers, more than 500,000 people in long-term care centers are diagnosed with pressure ulcers every year. Pressure ulcers generally occur at locations of the body where the bony prominence is high and the underlying skin breaks down when constant pressure is placed against the skin. Blood circulation is inhibited or prevented in these localized areas and can even occur when the patient has been lying against or upon cushioning devices. Examples of areas of the body where pressure sores typically occur include the sacrum, greater trochanter, ischial tuberosity, malleolus, heel, etc. When pressure ulcers form, they can lead to extensive stays in the hospital or even to amputation.
Conventional cushioning devices generally utilize flexible materials such as foam or springs which allow for the cushion to deform and conform to the patient's body. While the cushioning device attempts to redistribute the loading from localized regions of the patient's body to a larger area over the rest of the body, such devices typically bottom out such that the patient's body contacts the underlying platform and nonetheless localizes the pressure onto the body.
Other cushioning devices have utilized fluid-filled cushions which consist of large single bladders or compartmentalized fluid or gas-filled bladders which inhibit fluid contained within the bladders from flowing laterally. In a fluid filled bladder disposed on a contoured seat, the fluid filled bladder typically bottoms out in one or more areas when supporting a patient's body weight. The places where the bladder bottoms out are sources of high localized pressure. Thus, such an assembly does not distribute pressure evenly across the portions of the anatomy in contact with the bladder. The amount of water that is used in such a bladder can be increased such that bottoming out does not occur. However, this design sacrifices stability. Additionally, since such cushions are typically designed to accommodate a wide range of patient populations, patients who are not as heavy as the maximum for which the cushion was designed for will suffer even more lack of stability than would be needed.
Another problem with simply increasing the amount of fluid to prevent bottoming out is that this requires significant volume of fluid beneath the patient and/or require specialized bedding. Additionally, many fluid filled membranes are too thick to provide adequate pressure relief because the hammocking that occurs in the regions of high protrusions. Thus, the suspension of the patient's body typically results in significantly non-uniform pressure application, with higher pressures being applied to protruding portions of the patient's body due to lack of adequate conformance of the bladder material to the patient's body.
Yet other cushioning devices utilize segmented bladders in an attempt to isolate individual bladders from one another. Yet such segmented cushions may fail to allow for the cushion to fully conform to the patient's body as fluid flow between each of the segmented cushions is prevented.
Accordingly, there exists a need for a cushioning device which may conform to regions of the patient's body to increase comfort as well as prevent decubitis ulcers in a manner which is more cost efficient, convenient, and effective.
A support assembly as described herein may be incorporated into or upon a cushion that the user sits upon when such cushions are used in comfort chairs such as recliners, massage chairs, office chairs, sofas, car seats, or any other sitting or sleeping surface or platform to provide a cushioning surface which distributes the pressure of a user around the user's body.
Generally, one variation of the support assembly may comprise a cushion having a surface sized for placement beneath a body of a user, the surface defining at least a first channel and a second channel therein and a fluid-filled bladder sized for placement upon the surface. The assembly may further comprise a first plurality of pods which are fluid-filled and aligned adjacent to one another within a first covering such that each pod within the first covering is in contact with an adjacent pod and a second plurality of pods which are fluid-filled and aligned adjacent to one another within a second covering such that each pod within the second covering is in contact with an adjacent pod. The first plurality of pods and the second plurality of pods are positioned upon or beneath opposing ends of the fluid-filled bladder such that the first plurality and second plurality are retained respectively within the first channel and the second channel.
In another variation, the cushion may have a surface sized for placement beneath a body of a user, the surface defining at least a first channel and a second channel and a depression extending between the channels. The fluid-filled bladder may be sized for placement upon the depression and the first and second channels.
One variation of a support assembly may use a cushion which defines a receiving channel at least partially within the material of the cushion for receiving an insert assembly. The receiving channel and insert assembly may be positioned in proximity to where the user would typically sit upon the surface of cushion when properly seated upon the chair or surface.
The cushion itself may have first and second channels defined along the cushion with a depression defined between the channels which may be spaced apart from one another such that the channels are aligned in proximity to where the outer thighs of the user would typically be placed when seated upon the cushion. The channels may also be defined at a depth from an upper surface of the cushion although this depth may be varied between both channels or just a single channel. Additionally, the channels may be defined to be parallel to one another although in other variations, the channels may be angled relative to one another. A depression may be defined to extend between the channels at a depth relative to the upper surface of the cushion. While the depth of depression may be relatively shallower than the depth of the channels, in other variations the depth may be the same or similar to one another.
In either case, the insert assembly may generally comprise a fluid bladder which is sized to accommodate the user sitting upon the bladder. The bladder may be filled with any number of incompressible fluids, e.g., water, oils, fluids of various viscosities, or combinations thereof. Additionally and/or alternatively, the fluid bladder may be defined as a single or multiple chambered layer.
The insert assembly may also comprise a number of fluid-filled pods which are contained in alignment in at least two pod support assemblies which are contained within coverings. The pod assemblies and bladder may be contained within a cover and positioned over the cushion such that the fluid bladder may be positioned within the bottom portion of the first channel, over depression, and also within the bottom portion of the second channel such that the pods are aligned within the channels while resting upon the upper surface of the bladder. The cushion cover may then encapsulate the entire assembly. With the fluid bladder and pods positioned accordingly within or upon the cushion, the insert assembly may maintain a flush low-profile over the cushion but still ensure that the fluid contained within the fluid bladder and pods provides the support to the user. In other variations, the channels and depression may be omitted entirely and the insert assembly may be positioned directly atop the cushion surface. In yet other variations, the pod assemblies enclosed within their respective coverings may be positioned directly between the bottom of the first and second channels and the bottom surface of the fluid bladder.
With any of the variations described herein, different features and aspects from each of the variations may be combined with one another in various combinations.
A typical cushion support such as those found in comfort chairs are generally made of a foam material and offer some support to the user sitting upon the cushion. These foam cushions typically provide a sitting or sleeping surface made of foam padding surrounded by a covering. However, foam materials by their nature compress and generate higher pressures against the user sitting upon the cushion. Thus, a support assembly as described herein may be incorporated into or upon a cushion that the user sits upon when such cushions are used in comfort chairs such as recliners, massage chairs, office chairs, sofas, car seats, or any other sitting or sleeping surface or platform to provide a cushioning surface which distributes the pressure of a user around the user's body.
One variation of a support assembly 10 is shown in the perspective view of
In either case, the insert assembly 16 may generally comprise a fluid bladder 22 which is sized to accommodate the user sitting upon the bladder 22. For instance, the fluid bladder 22 may have a length of, e.g., 63.5 cm to 76.2 cm (25 in. to 30 in.), and a width of, e.g., 25.4 cm to 50.8 cm (10 in. to 20 in.). The bladder 22 may be filled with any number of incompressible fluids, e.g., water, oils, fluids of various viscosities, or combinations thereof. Additionally and/or alternatively, the fluid bladder 22 may be defined as a single or multiple chambered layer. In the event that the bladder 22 is comprised of multiple chambers, each of the chambers may be fluidly isolated or they may remain in fluid communication with one another. Optionally, the fluid bladder 22 may also contain one or more baffles throughout the interior to allow for a uniform flow of fluid through the interior volume.
The insert assembly 16 may also comprise a number of fluid-filled pods 24A, 24B which are contained in alignment in at least two pod support assemblies which are contained within coverings 26A, 26B. In this example, two support pod assemblies may be positioned along one or both sides of the bladder 22 such that pods 24A, 24B are aligned in series adjacent to one another upon an upper surface of the bladder 22 near or in proximity to opposing ends of the bladder 22. The pod assemblies and bladder 22 may be contained within a cover 28 and positioned over the cushion 12 such that the fluid bladder 22 may be positioned within the bottom portion of the first channel 18A, over depression 20, and also within the bottom portion of the second channel 18B, as shown in
Further examples and details of other variations of the support assembly may be seen in the following patents and patent applications: U.S. Ser. Nos. 13/189,320 filed Jul. 22, 2011 (U.S. Pat. No. 8,776,798); 13/407,628 filed Feb. 28, 2012 (U.S. Pat. No. 8,656,919); 13/683,198 filed Nov. 21, 2012 (U.S. Pub. 2013/0112213 A1); 13/693,691 filed Dec. 4, 2012 (U.S. Pub. 2013/0092175 A1); 13/760,482 filed Feb. 6, 2013 (U.S. Pub. 2013/0180530 A1); 13/784,035 filed Mar. 4, 2013 (U.S. Pub. 2013/0180531 A1); 13/784,133 filed Mar. 4, 2013 (U.S. Pub. 2013/0174855 A1); 13/784,215 filed Mar. 4, 2013 (U.S. Pub. 2013/0174856 A1); 13/784,260 filed Mar. 4, 2013 (U.S. Pub. 2013/0174859 A1); and 13/945,684 filed Jul. 18, 2013 (U.S. Pub. 2013/0298918 A1). Each of these references is incorporated herein by reference in its entirety and for any purpose herein. It is also intended that the devices and methods described herein may be utilized with the features and methods described in these references in various combinations.
The fluid pad 22 may define a central portion which may provide support directly beneath the patient body by utilizing one or more fluid layers which are contained within and which helps to distribute any localized loads onto the surrounding areas and to further control their displacement and inhibit or prevent the bottoming out of the fluid layers. The pod assemblies may thus contain one or more fluid filled individual pods 24A, 24B which may be enclosed entirely within their respective coverings 26A, 26B. Each of the one or more pods 24A, 24B may be separated from one another such that no fluid communication occurs between the pods 24A, 24B and/or with the fluid bladder 22. Yet each of the pods 24A, 24B may occupy an envelope of, e.g., 1 cm×1 cm×0.5 cm to about 3 cm×3 cm×3 cm or even 35 cm×5 cm×5 cm, in an uncompressed state and they may be formed into various shapes, e.g., spherical, cylindrical, cubical, etc. Moreover, each of the pods may be formed from various materials such as polyurethane, silicone, vinyl, nylon, polyethylene vinyl acetate (PEVA), etc. having a thickness ranging from, e.g., 0.1 mm to 5 mm.
Although the
Additionally, while the pods 24A, 24B may be unconstrained within the covering 26A, 26B such that they freely move relative to one another, in other variations, the pods 24A, 24B may be secured within the covering 26A, 26B to one another itself such that their relative movement is constrained.
In either case, the pods 24A, 24B may transfer localized loads from the user received by a few pods 24A, 24B either to adjacent pods through the compression and transfer of pressure to adjacent contacting pods or through transmission via the fluid in the fluid bladder 22. The amount of compression of the pods 24A, 24B themselves may be controlled by the covering 26A, 26B which envelopes the pods 24A, 24B within. The covering 26A, 26B may function as a hammocking layer to constrain the amount of displacement experienced by the individual pods 24A, 24B and provide an increase in the net force constant relative to the force constant due to compression of the individual pods 24A, 24B. This increase in net force may be due to pressure applied by inner pad directly on the surfaces of the individual pods 24A, 24B and/or due to force applied through the fluid that fills the fluid bladder 22. The amount of compression experienced by the individual pods 24A, 24B may range anywhere from, e.g., 0% to 90% (or 10% to 90%), of the uncompressed height of the pods 24A, 24B. For example, for a pod 28 having an uncompressed height of 3 cm, the compression of the pod 24A, 24B may range anywhere from, e.g., 0 cm to 2.7 cm (or 0.3 cm to 2.7 cm).
Additionally and/or alternatively, any of the variations described herein may also incorporate the use of temperature modulation and control to further help prevent the formation of pressure ulcers. For example, the support assembly pad may be controlled to have a temperature which is lower than body temperature to help prevent the formation of pressure ulcers while having an assembly pad controlled to have a temperature which is higher than body temperature can be used to treat pressure ulcers which have already formed upon the body. For example, the assembly pad can be configured to control the contacted skin/tissue temperature to within ±10° C. of body temperature.
Another variation of the support assembly 10 is illustrated in the perspective view of
Yet in other variations, one pod assembly may be positioned below the fluid bladder 22 while the other pod assembly is positioned above the fluid bladder. In yet another variation, the pod assemblies may be positioned within their respective first and second channels 18A, 18B, but the fluid bladder 22 may be sized to lay within the depression 20 without overlapping with the pods 24A, 24B positioned adjacent on either side of the fluid bladder 22.
In yet another variation,
Another variation is illustrated in the perspective view of
The applications of the devices and methods discussed above are not limited to particular regions of the body but may include any number of further applications. Modification of the above-described device and methods for carrying out the invention, and variations of aspects of the invention that are obvious to those of skill in the art are intended to be within the scope of the claims.
This application claims the benefit of priority to U.S. Prov. App. 62/194,573 filed Jul. 20, 2015, which is incorporated herein by reference in its entirety.
Number | Date | Country | |
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62194573 | Jul 2015 | US |