Patent Application
20110030144
The present invention relates to a cushioning device, such as an overlay for a mattress.
Therapeutic supports for bedridden patients have been well known for many years. Such therapeutic supports include inflatable mattresses and cushions, as well as a variety of foam mattresses and cushions. Most therapeutic mattresses and cushions are designed to reduce “interface pressures,” which are the pressures encountered between the mattress and the skin of a patient lying on the mattress. It is well known that interface pressures can significantly affect the well-being of immobile patients in that higher interface pressures can reduce local blood circulation, tending to cause bed sores and other complications. With inflatable mattresses, such interface pressures depend (in part) on the air pressure within the inflatable support cushions. Most inflatable therapeutic mattresses are designed to maintain a desired air volume within the inflated cushion or cushions to prevent bottoming. “Bottoming” refers to any state where the upper surface of any given cushion is depressed to a point that it contacts the lower surface, thereby markedly increasing the interface pressure where the two surfaces contact each other.
One type of therapeutic support is an inflatable cushion used as an overlay (i.e., a supplemental pad positioned on top of an existing structure, such as a mattress). For example, the Sof-Care® cushions made by Gaymar Industries, Inc. are cushions which overlay an existing mattress and which include a multitude of lower individual air chambers and a multitude of upper individual air chambers with air transfer channels therebetween. Air is transferred through the interconnecting channels to redistribute the patient's weight over the entire bed cushion. A three layer overlay cushion (see
A Sof-Care® II cushion embodiment is shown in
As shown in
The cushion also may include handle structures 18a and 18b (
The bladder has a plurality of button welds, illustrated at 24, to inhibit ballooning of the bladder. The button welds 24 produce, as illustrated in
The Sof-Care® II cushion (a) in a two layer embodiment, had the top polymeric material 20 sealed to the bottom polymeric material 22 at the edges 14 and 16 (see
In some embodiments, the edges 14, 16 are extended. The extended edges, as illustrated in
There is a problem when a handle is used in the prior art cushion design. When the person pulls the cushion from the handle, the person also pulls on the seals at the button welds 24 and the edges 14 and 16. Pulling the seals in the prior art cushion design with a patient thereon during patient transfer processes increases the chance of leakage at the respective buttons welds 24 and edges 14, 16. Leakage at the button welds and edges is undesirable because it results in bottoming, described above, and/or immediate air losses. Immediate air losses sometimes occur when seals are damaged and the air is directed toward the edges 14, 16, not to the desired cells. Once the air is directed to the edges, the edges increase in size and form a “hot-dog roll” structure about the patient and then the edges may burst. Obviously, leaking, bottoming and immediate air losse are undesirable effects when a person re-positions a prior art cushion.
The current invention solves that problem in a unique three-tiered cushion design. The present invention is directed to overcoming these and other deficiencies in the art.
A cushioning device has a first material and an opposing second material that are sealed together at the peripheral edges to form a first (right) side, a first (head) end, a second (left) side, and a second (foot) end. Positioned between the first material and the second material is a middle material. The middle material has a top side, a bottom side, a first gap between the first side and the middle material and a second gap between the second side and the middle material. In addition, the first material is sealed to the middle material's top side at a first set of locations to form a first set of interior welds. The second surface is sealed to the middle material's bottom surface at a second set of locations to form a second set of interior welds. The first set of interior welds on the middle material's top surface and the second set of interior welds on the middle material's bottom surface are not superimposed on each other or overlap each other.
The above-identified prior art cushion structure and the claimed invention are similar in some ways, and different in others.
The claimed invention is a cushioning device 200 as shown in
The first surface 220 and the opposing second surface 222 can each be a three-ply puncture-resistant vinyl film or other suitable air impervious flexible material, a two-ply air impervious flexible material, or an air impervious flexible material. The first surface 220 and the opposing second surface 222 can also be two distinct pieces of material or one material piece folded over. In addition, the first surface 220 and the second surface 222 are joined together at the first side 214, the first end 215, the second side 216 and/or the second end 217 by conventional sealing methods. Conventional sealing methods include and are not limited to heat sealing, sonic welding, and adhesives.
The cushioning device 200 includes at the first end 215 or the second end 217 a connector 228 for receiving air, or possibly another fluid like water, from an inlet hose interconnected to a pump system. The pump system can be Gaymar's Sof-Care pump or any other conventional pump system that can direct air or other fluids into and possibly out of the cushion device 200.
The cushioning device 200 has a plurality of interior welds, illustrated at 224, to inhibit ballooning of the bladder. Interior welds means the welds are not at the first side 214, the first end 215, the second side 216 and/or the second end 217. In a preferred embodiment the interior welds are button welds and in certain embodiments bar welds.
Button welds have an exterior diameter and in some embodiments an interior diameter. The area (a) within the exterior diameter or (b) between the exterior and interior diameters is sealed and conventionally joins a first material and a second material together. Those sealed areas are formed by conventional sealing methods that include and are not limited to heat sealing and sonic sealing.
The interior welds and configuration of the current cushioning device provide a reinforced, unitary cushion design. The first surface 220 and the second surface 222 are not joined together to form conventional interior welds, which include button welds. Instead, the interior welds are formed between (a) the first surface 220 and first areas on a top surface of a middle material 221 to form a top fluid area 302 (“first set of interior welds 224a”) and (b) the second surface 222 and second areas on a bottom surface of the middle material 221 to form a bottom fluid area 304 (“second set of interior welds 224b”). See
The first set of interior welds and the second set of interior welds are not at the same location on the respective surfaces of or superimposed on the middle material. The first set of interior welds and the second set of interior welds are positioned a distance from each other. As illustrated in
The middle surface 221 is a material that can be heat sealed or sonic sealed to the first surface 220 and the second surface 222. In addition the middle surface 221 can be the same or different material as the first surface 220 and/or the second surface 222. Conventionally, the middle surface, the first surface and the second surface have some and sufficient amount of polymeric fibers therein that allow these materials to effectively seal together.
The middle surface 221 connects with the seal between the first surface 220 and the second surface 222 at the first end 215 and the second end 217. The middle surface 221, however, does not connect with the seals between the first polymeric surface 220 and the second polymeric surface 222 at the first side 214 and the second side 216. By not connecting to the first side 214 and the second side 216, there is a first gap area 230a between the middle surface 221 and the first side 214; and a second gap area 230b between the middle surface'221 and the second side 216.
Those gaps 230a, 230b allow air (see arrows at
These overlapping cushioning sections 212a, 212b ensure there is no area in the cushion device's 200 cushioning sections 212a, 212b that does not provide fluid pressure to the patient. The overlapping cushioning sections also ensure the patient positioned on the cushion device is on a relatively planar surface—there are no obvious indentations at the bar weld areas.
As indicated above, the overlapping cushioning sections 212a, 212b can each be inflated to the same pressure or alternatively to different pressures. That means each section 212a, 212b has an inlet to receive the desired pressure. By controlling the pressures in the respective sections 212a, 212b and having the overlapping sections 212a, 212b, the tissue interface pressure can be controlled to decrease the chance of forming bed sores.
At the first side 214 and second side 216 are handle areas 330 and extended gap areas 230c. The handle areas 330 are located where the first surface 220 and the second surface area 222 are joined together. Each handle area 330 has a handle aperture 332. The handle aperture 332 is shaped to receive a person's hand so the person can push or pull the cushioning device 200 to a desired location. Between the handle areas 330 along the first side 214 and the handle areas 330 along the second side 216 are extended gap areas 230c. The extended gap areas 230c are enlarged areas of (a) the first gap area 230a between the middle surface 221 and the first side 214; and (b) the second gap area 230b between the middle surface 221 and the second side 216.
The interior welds 302, 304 (normally button weld configurations) and gaps 230a, 230b, 230c, in combination, provide greater flexibility to the bladder, decreases the stress applied to the seal between the first surface 220 and the second surface 222 at the first side 214 and the second side 216, and increases the bladder's loft near the first and second sides 214, 216 in relation to the prior art.
Since the interior welds 302, 304 are not superimposed over and under each other, the first surface 220 and the second surface 222 are not structured to meet at the same interior locations. By not being structured to meet at the same interior locations, the first surface 220 and the second surface 222 are also not subject to the identical pressures applied by a patient lying thereon.
The lack of identical pressures allows the first surface 220 and the second surface 222 to redistribute the patient's body weight through the middle surface 221.
Moreover, the middle surface 221 promotes the redistribution by not concentrating the pressures at identical weak points in the interior section of the cushion 200—the interior welds. The redistribution occurs because the first surface 220 and the second surface 222 having some independence from each other in the cushion's interior section. Independence refers to the facts that the top and bottom welds 224a, 224b are (a) not superimposed on each other and (b) connected to a middle layer 221 that is not interconnected to the sides 214, 216 that in turn provides some freedom of movement not absolutely controlled by the top surface 220 or the second surface 222. That independence decreases the stress applied to the first surface 220 and the second surface 222 that can result in leaks at the first side 214 and/or the second side 216. In some instances the leaks result in hot-dog explosions that cause immediate air loss from the entire bladder. Uncontrolled air loss is undesirable.
Leaks are further defused by having the gaps 230a, 230b, 230c act as valve releases between the top fluid area 302 and the bottom fluid area 304.
Leaks are further defused in the current invention when the first side 214 and/or the second side 216 have handle areas 330. The handle areas 330 with handle apertures 332 allow a person to position their hands therein. Once the hands are properly positioned in the handle apertures 332, the person can pull on the handles to re-position the cushioning device 200 to a desired position. The top fluid area 302 and the bottom fluid area 304 separated by the middle polymeric surface 221, the interior button welds 302, 304 having the above-identified configuration on the middle polymeric surface 221 and gaps 230a, 230b, 230c between the middle surface 221 and the first and second sides 214, 216 act collectively as a valve that decreases the pressure and stress applied to the cushioning device 200 when being moved. Thereby the current invention further decreases the chance of forming leaks in the cushioning device 200 at handle areas 330.
The top fluid area 302 and the bottom fluid area 304 separated by the middle surface 221, the interior welds 302, 304 having the above-identified configuration on the middle surface 221, and the gaps 230a, 230b, 230c between the middle surface 221 and the first and second sides 214, 216 also ensure the air is properly circulated and maintained in desired locations. When the air is properly circulated and maintained in desired locations, the bladder's loft near the first and second sides 214, 216 is greater in relation to the prior art's loft.
The use of the cushioning device of the present invention will now be described in detail. In use, the cushioning device is positioned on a support structure and secured using straps, if present. The cushioning device 200 is then connected to an inflation device, such as a pump. The pump is activated to inflate the cushioning device 200. A user is then positioned on the c cushioning device 200 and the cushioning device 200 is checked to confirm that it is not bottoming out. Alternatively, the user may be positioned on the cushioning section prior to inflating the cushioning device 200.
The cushioning device 200 customizes itself to the body weight and configuration of each individual patient that lies thereon. By conforming to the patient, the cushioning device 200 decreases external pressures from compressing, becoming rigid and adding pressure to body tissues. By design, the cushioning device requires a simple hand check to ensure the cushion 200 is maintaining proper pressure.
The bariatric cushioning embodiment illustrated in
Although preferred embodiments have been depicted and described in detail herein, it will be apparent to those skilled in the relevant art that various modifications, additions, substitutions, and the like can be made without departing from the spirit of the invention and these are therefore considered to be within the scope of the invention as defined in the claims which follow.
