Patent Application
20120311787
Positioners, pressure relief devices, offloading devices and supports for body parts are known. For example, pillows or pads have been used for support of body parts. The supports have typically been formed of foam, gel or polyfill. Positioning aids have been described for restraining or immobilizing a part of the body of a medical patient. U.S. Pat. No. 3,764,404 describes a positioning aid. Polystyrene beads are confined within a bag. A self-closing valve communicating with the interior of the bag is used for evacuating air therefrom. After the bag is conformed to a portion of a patient's body, the positioning aid is evacuated and the aid becomes rigid with no flow characteristics of the material.
It is desirable to provide a support having no memory or substantially no memory to enable the support to maintain contour to a body part. It is also desirable to provide a method and system for changing flow characteristics of a support, such as body part support and in particular, to a custom fitting limb or body part support.
The present invention provides a method and system for customization of flow characteristics of a support using permanent and controlled evacuation of interstitial gas during the manufacturing process. For example, the gas can be air, helium, hydrogen or nitrogen. The flow characteristics can be customized to provide a stiffer or less stiff support by a comparative degree. For example, a bladder with reduced flow characteristics can be used in an operating room and a bladder with maximum flow characteristics could be used in an ICU. The flow characteristics can be permanently changed.
The support includes a bladder filled with a fluidized particulate material. The medium of the fluidized particulate material includes interstitial spaces. The interstitial spaces can be formed by separation of the particulate material which is determined by shapes and sizes of particulate material. In one embodiment, the interstitial gas that is removed can be from within beads of the fluidized particulate material. In one embodiment, the particulate material refers to a compound or composition which can be sculpted and retain its shape and has no memory or substantially no memory. The no memory or substantially no memory feature enables the bladder to increase in height and simultaneously maintain support and three-dimensional micro-contouring to a body part. As the deflation occurs, the flow characteristic of the particulate material is changed.
A predetermined amount of gas can be removed to provide a support having a specific support characteristic. The present invention provides that an amount of gas of about 500 millibars, preferably about 350 millibars to about 5 millibars to zero can be evacuated and the support will still provide fluid flow characteristics. In the present invention, a combination of a fill weight of the material within the support and the amount of gas removed can be used to control the flow characteristics of the material within the support. In one embodiment, substantially all gas is withdrawn from other fluidized particulate material, for example, to a pressure below about 5 millibars. In theory, flow characteristics can be brought below about 5 millibars but would render product non-functional because it would severely limit flow capabilities in most but not all particulate mediums.
The support can be used as a pillow or as a pad to support any body extremity. For example, the support can be sized to fit and conform around a limb, such as an arm or leg or a portion thereof, foot, heel, finger, toe, torso, occiput, face or neck.
The invention will be more fully described by reference to the following drawings.
Reference will now be made in greater detail to a preferred embodiment of the invention, an example of which is illustrated in the accompanying drawings. Wherever possible, the same reference numerals will be used throughout the drawings and the description to refer to the same or like parts.
In a subsequent step, bladder 11 is weighed on scale 20, as shown in
Support 60 is formed to have a predetermined permanent flow characteristic. Support 60 can be formed to fit around any body extremity. For example, support 60 can be sized to fit around a limb, such as an arm or leg or a portion thereof, finger, toe, torso, occiput, face or neck for providing simultaneous support characteristics and three-dimensional contouring characteristics.
In one embodiment, composition 12 can include a compound or composition which can be sculpted and retain its shape and has no memory or substantially no memory. The no memory or substantially no memory feature enables bladder 11 to mold in order to increase in height and maintain support of a body part. Composition 12 can be made of a viscosity that will allow it to contour but not collapse under the weight of the body part. In one embodiment, composition 12 can be formed of a mixture of microspheres and lubricant. The microspheres can include hollow or gas-filled structural bubbles (typically of glass or plastic) with an average diameter of less than 200 microns. The composition flows and stresses in response to a deforming pressure exerted on it and the composition ceases to flow and stresses when the deforming pressure is terminated. For example, composition 12 can be formed of a product referenced to as Floam™. A flowable compound comprising lubricated microspheres, including the compound itself, formulations for making the compound, methods for making the compound, products made from the compound and methods for making products from the compound as defined by U.S. Pat. Nos. 5,421,874, 5,549,743, 5,626,657, 6,020,055, 6,197,099, and 8,171,585, each of which is hereby incorporated by reference into this application.
Bladder 11 can be formed of any air tight flexible plastic, such as urethane. Upon removal of residual gas 15 from composition 12, bladder 11 flows concurrent with the flow of composition 12 such that bladder 11 moves with movement of composition 12. Bladder 11 provides micro-contouring because composition 12 can respond three-dimensionally.
In one embodiment, thermo-regulating material 16 is associated with composition 12. An example material for thermo-regulating material 16 is manufactured by Outlast Technologies as fibers, fabrics, and foams comprising micro-encapsulated phase changing materials referred to as Thermocules, which store and release heat as further described in U.S. Pat. Nos. 7,790,283, 7,666,502 and 7,579,078, hereby incorporated by reference into this application. In one embodiment, the phase change material is a particulate or a lubricant for a particulate.
In one embodiment, a lubricant and/or binding agent 18 can be present in interstitial spaces 13. For example, lubricant and/or binding agent 18 can be a particulate material having a lower coefficient of friction, such as a powder. Lubricant and/or binding agent 18 can also include a dry medium, moist medium or wet medium. In one embodiment, composition 12 can include beads, such as polyethylene or polystyrene beads, expanded cross linked polyethylene, polypropylene beads, foam beads, or beads made of a similar medium. The beads can be hard shelled or flexible. In one embodiment, the beads are porous and flexible and gas 15 can be evacuated from the beads. In one embodiment, hard or rigid beads can be mixed with flexible beads in which gas 15 can be evacuated from the flexible beads. In one embodiment, composition 12 includes closed cell beads and open cell beads, such as foam, and gas 15 is removed from the foam. The smaller the interstitial spaces, the more the particles will collide thereby making composition 12 stiffer.
The fluidized particulate material forming composition 12 can be formed of a material that normally would not have fluid characteristics in which flow characteristics are provided based on the interstitial spaces formed within the fluidized particulate material. A fluidized particulate material can be formed by lubricating spherical particles, using powder spherical particles and/or reducing the coefficient of friction. The flow characteristics can be controlled, for example, by reducing interstitial gas 15 which reduces the flow of the fluidized particulate material reducing surface contact which reduces friction between particles of the fluidized particulate material and/or using hard and soft particles in the fluidized particulate material.
In one embodiment, substantially all gas is withdrawn from the fluidized particulate material, for example, to a pressure below about 5 millibars.
The shapes and sizes of the particles in composition 12 can be selected to achieve desired flow characteristics. In one embodiment, a larger particulate material, such as expandable polyethylene beads, is used in composition 12 to provide greater interstitial spaces between particles. In this embodiment, increased gas is evacuated in order to achieve similar flow characteristics for composition 12, including smaller particles. The reduction of interstitial space by virtue of the addition of wet or dry lubricant will change the amount of air evacuation required to reduce the flow characteristic.
In one embodiment, lubricant is formed as an emulsification of porous beads that partially fills interstitial spaces. In this embodiment, less gas is withdrawn from the interstitial spaces 13 due to the porosity of the porous beads.
Support 100 is formed to have predetermined permanent flow characteristics. In this embodiment, bladder 110a provides increased flow characteristics over bladder 110b which has reduced flow characteristics. Accordingly, bladder 110a provides less support than bladder 110b. Composition 12 having greater interstitial spacing 13 is shown in bladder 110a. Composition 12 having less interstitial spacing 13 is shown in bladder 110b. Accordingly, composition 12 shown in bladder 110a will have the greatest flow characteristics and composition 12 shown in bladder 110b will have the least flow characteristics. For example, an amount of gas can be evacuated from bladder 110a to provide a pressure in the range of about 500 millibars to about 100 millibars. An amount of gas can be evacuated from bladder 110b to provide a pressure in the range of about 100 millibars to about 5 millibars.
Support 200 is formed to have predetermined permanent flow characteristics. In this embodiment, bladder 210a provides increased flow characteristics over bladder 210b. Bladder 210b has increased flow characteristics over bladder 210n. Accordingly, bladder 210a provides minimum or loose support. Bladder 210b provides medium support. Bladder 210c provides maximum or stiff support. Composition 12 having the greatest interstitial spacing 13 is shown in bladder 210a. Composition 12 having reduced interstitial spacing 13 is shown in bladder 210b. Composition 12 having the least interstitial spacing 13 is shown in bladder 210n. Accordingly, composition 12 shown in bladder 210a will have the greatest flow characteristics. Composition 12 shown in bladder 210b will have flow characteristics less than the flow characteristics in bladder 210a and more than the flow characteristics in bladder 210n. Composition 12 shown in bladder 210n will have the least flow characteristics. For example, an amount of gas can be evacuated from bladder 210a to provide a pressure in the range of about 500 millibars to about 100 millibars. An amount of gas can be evacuated from bladder 210b to provide a pressure in the range of about 100 millibars to about 25 millibars. An amount of gas can be evacuated from bladder 210n to provide a pressure in the range of about 25 millibars to about 5 millibars.
It is to be understood that the above-described embodiments are illustrative of only a few of the many possible specific embodiments, which can represent applications of the principles of the invention. Numerous and varied other arrangements can be readily devised in accordance with these principles by those skilled in the art without departing from the spirit and scope of the invention.
This application claims the benefit of U.S. Provisional Patent Application No. 61/495,078, filed Jun. 9, 2011, the entirety of which is hereby incorporated by reference into this application.
| Number | Date | Country | |
|---|---|---|---|
| 61495078 | Jun 2011 | US |
