Adjustable anatomical support and seat cushion apparatus for wheelchairs

Abstract

An adjustable anatomical support and seat cushion apparatus for wheelchairs and the like, including a resilient, cellular thermoplastic honeycomb seat cushion member and a pivotally attached base member forming a planar base upon which the cushion member will rest when folded about the attaching pivot to engage and lay thereupon. Positioned upon and secured to the base member and disposed between it and the overlying cushion member, are user or therapist positionable, prescriptively sized and shaped pelvic obliquity elements, pommel elements and/or wedge elements operative to deform the cushion member when engaged with the bottom thereof. The assembly of components is contained within a suitable fabric cover envelope.

Claims

1. (canceled)

2. An adjustable anatomical support and seat cushion apparatus for wheelchairs, comprising: a generally rectangular, resilient seat cushion member; a generally rectangular, planer base member disposed beneath said cushion member and having one side edge thereof pivotally attached to a corresponding side edge of said cushion member, said cushion member being rotatable between a non-parallel disposition relative to said base member, and a parallel disposition relative to said base member; and a plurality of prescriptively sized and shaped pelvic obliquity elements, pommel elements and/or wedge elements affixed to a surface of said base member generally facing said cushion member, said pelvic obliquity elements, pommel elements and/or wedge elements being operative to engage and deform said cushion member when said cushion member is rotated from said non-parallel disposition relative to said base member into said parallel disposition relative to said member.

3. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 2 and further comprising a cover removably disposed about the assembly including said cushion member, said pelvic obliquity elements, pommel elements and/or wedge elements, and said base member.

4. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 3 wherein said cover includes an opening for allowing said assembly to be inserted into said cover, and closure means disposed about said opening for allowing said assembly to be closedly enveloped within said cover.

5. An adjustable anatomical support and seat cushion apparatus for wheelchairs, s as recited in claim 2 wherein said cushion member is made of a cellular thermoplastic honeycomb material.

6. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 5 wherein the cell walls of said cellular thermoplastic honeycomb material are perforated.

7. An adjustable anatomical support and seat cushion apparatus for wheelchairs, comprising: a generally planer, rectangular base member having a first planform with a back edge, a front edge and left and right side edges respectively connecting said front and back edges; a generally rectangular and resilient cushion member having a second planform substantially congruent with said first planform and disposed in overlying relationship to said base member, said cushion member being pivotally attached along a back edge thereof to a corresponding back edge of said base member and rotatable between a non-parallel disposition relative to said base member and a parallel disposition relative to said base member; and a plurality of variously sized and shaped cushion deforming elements affixed to a surface of said planer base member generally facing said cushion member, said cushion deforming elements being operative to engage and deform said cushion member when said cushion member is rotated from said non-parallel disposition relative to said base member into said parallel disposition relative to said base member.

8. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 7 and further comprising: cover means removably disposed about said cushion member, said base member and said cushion deforming elements when said cushion member is disposed in parallel disposition relative to said base member.

9. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 7 wherein at least one of said cushion deforming elements is a pelvic obliquity element and is disposed on said base member in a position proximate said back edge and one of said side edges.

10. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 7 wherein at least one of said cushion deforming elements is a pommel element and is disposed on said base member in a position proximate to said front edge and midway between said side edges.

11. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 7 wherein at least one of said cushion deforming elements is a wedge element and is disposed on said base member in a position proximate said front edge and one of said side edges.

12. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 7 wherein said cushion member has a first resiliency, and said base member has a second resiliency substantially stiffer than said first resiliency.

13. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 7 wherein said cushion member and said base member are each made of at least one layer of cellular thermoplastic elastomeric honeycomb material and the pivotal attachment of said cushion member to said base member is made by thermo-compression bonding of said back edge of said cushion member to said back edge of said base member.

14. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 9 wherein at least one of said cushion member and said base member are made of at least one layer of cellular thermoplastic elastomeric honeycomb material.

15. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 10 wherein at least one of said cushion member and said base member are made of at least one layer of cellular thermoplastic elastomeric honeycomb material.

16. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 11 wherein at least one of said cushion member and said base member are made of at least one layer of cellular thermoplastic elastomeric honeycomb material.

17. An adjustable anatomical support and seat cushion apparatus for wheelchairs, comprising: a resilient seat cushion member having a user supporting top surface with a generally rectangular planform and a corresponding rectangular bottom surface parallel to said top surface, said resilient seat cushion member being made of material having adjustable, generally uniform user support characteristics across said user supporting top surface; pivot means; a generally planer rectangular base member disposed beneath said cushion member and having a planform substantially congruent with that of said cushion member, said base member having a top surface generally facing the bottom surface of said cushion member and an edge thereof pivotally affixed by said pivot means to a corresponding part of said cushion member, said cushion member being rotatable about said pivot means between a non-parallel disposition relative to said base member and a parallel disposition relative to said base member; a plurality of cushion deforming elements selectively affixed to predetermined areas of the top surface of said planer base member, said cushion deforming elements being operative to engage and deform said cushion member when said cushion member is rotated from said non-parallel disposition relative to said base member into said parallel disposition relative to said base member thereby changing the user support characteristics of said cushion member across its user supporting surface; and cover means adapted to envelope said cushion member, said cushion deforming elements and said base member when said cushion member and said base member are disposed in said parallel disposition thereby adjusting the user support characteristics of said cushion member across said user supporting top surface.

18. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 17 wherein at least one of said cushion member and said base member are made of at least one layer of cellular thermoplastic elastomeric honeycomb material.

19. An adjustable anatomical support and seat cushion apparatus for wheelchairs, comprising: a resilient seat cushion member having a user supporting top surface with a generally rectangular planform and a corresponding rectangular bottom surface generally parallel to said top surface, said resilient seat cushion member being made of material having adjustable, generally uniform user support characteristics across said user supporting top surface; a generally planer rectangular base member having a planform substantially equivalent to that of said cushion member, said base member having a generally planer top surface with a front edge, a back edge, a left side edge and a right side edge, said cushion member being movable between a first disposition generally separated relative to said base member and a second disposition in relative engagement with the top surface of said base member; a plurality of cushion deforming elements selectively affixed to predetermined areas of the top surface of said base member, said cushion deforming elements being operative to engage and deform said cushion member when said cushion member is moved from said first disposition relative to said base member into said second disposition relative to said base member; and means for maintaining said cushion member, said cushion deforming elements and said base member in engagement when said cushion member is moved from said first position to said second disposition causing said cushion deforming elements to engage and deform said cushion member thereby adjusting the user support characteristics of said cushion member across said user supporting top surface.

20. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 19 wherein at least one of said cushion member and said base member are made of at least one layer of cellular thermoplastic elastomeric honeycomb material.

21. An adjustable anatomical support and seat cushion apparatus for wheelchairs, as recited in claim 19 wherein at least one of said cushion deforming elements is a pelvic obliquity element disposed on said base member in a position proximate said back edge and one of said side edges, at least one of said cushion deforming elements is a pommel element disposed on said base member in a position proximate to said front edge and midway between said left and right side edges, and/or at least one of said cushion deforming elements is a wedge element disposed on said base member in a position proximate said front edge and one of said left and right side edges.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In the accompanying drawings:

[0041] FIG. 1 is a perspective view generally illustrating a standard wheelchair having disposed thereon an improved anatomical support and seat cushion apparatus constructed in accordance with a presently preferred embodiment of the present invention;

[0042] FIG. 2 is a stylized side elevational view illustrating an optimally postured patient sitting upright in a standard wheelchair of the type shown in FIG. 1;

[0043] FIG. 3 is a stylized partial cross-sectional view taken along the line 3-3 of the wheelchair illustrated in FIG. 1, and a patient expressing pelvic obliquity abnormality to illustrate one example of a condition that can be addressed using an anatomical support and cushion apparatus in accordance with the present invention;

[0044] FIG. 4 is a stylized side elevational view illustrating a patient sitting in a standard wheelchair of the type shown in FIG. 1 and expressing an anterior pelvic tilt abnormality to illustrate another example of a condition that can be addressed using a cushion apparatus in accordance with the present invention;

[0045] FIG. 5 is a stylized side elevational view illustrating a patient sitting in a standard wheelchair of the type shown in FIG. 1 and expressing a posterior pelvic tilt abnormality to illustrate another example of a condition that can be addressed using a cushion apparatus in accordance with the present invention;

[0046] FIG. 6 is a partially broken plan view illustrating a patient sitting in a standard wheelchair of the type shown in FIG. 1 and expressing a pelvic rotation abnormality to illustrate another example of a condition that can be addressed using a cushion apparatus in accordance with the present invention;

[0047] FIG. 7 is a stylized three-quarter view generally illustrating an adjustable anatomical support and cushion assembly, in its open configuration; the user supporting cushion member, the pivotally attached base member, and an assortment of obliquity elements, pommel elements and wedge elements all being disposed on the base member in accordance with an embodiment of the present invention;

[0048] FIGS. 8-10 illustrate in 3-dimensional perspective, generalized examples of the obliquity elements, pommel elements, and wedge elements depicted in FIG. 7;

[0049] FIG. 11 is a perspective view generally illustrating an ischial pad of a configuration that might be installed in an appropriate location on the cushion assembly or in a pocket formed in its cover;

[0050] FIG. 12 is a stylized three-quarter perspective view generally illustrating, in its open configuration, a zippered cover envelope for receiving and containing the cushion assembly illustrated in FIG. 7;

[0051] FIG. 13 is a stylized three-quarter perspective view, generally illustrating, in its open configuration, as viewed from the upper back side and opposite from that depicted in FIG. 7, of the user supporting cushion member and the pivotally attached base member, in accordance with an embodiment of the present invention;

[0052] FIG. 14 is a side view of the cushion assembly of FIG. 13 depicted in its open configuration;

[0053] FIG. 15 is a side view of the cushion assembly of FIG. 13 depicted in its closed configuration;

[0054] FIG. 16 is a frontal view showing the cushion assembly of FIG. 13 depicted in its closed configuration; and

[0055] FIG. 17 is a partially broken side view showing the closed cushion assembly of FIG. 13 enveloped in its zippered cushion assembly cover depicted in FIG. 12.

DETAILED DESCRIPTION OF THE EMBODIMENTS

[0056] Referring now to FIG. 1 of the Drawings which, as pointed out above, depicts a conventional wheelchair 10 having disposed thereon but shown without deformation, an adjustable, removable, improved anatomical support cushion assembly 12 enclosed in its fabric cover 30. As will be described in greater detail below, the cushion assembly 12 is constructed of at least one flexible thermoplastic elastomer honeycomb core panel built in accordance with the present invention. It should also be noted that although the cushion apparatus is particularly well suited for wheelchair applications, the cushion apparatus, or analogs thereof, may also be used in a variety of other anatomical support applications (e.g., mattresses, automobile and airline seats, arm rests, etc.).

[0057] FIG. 2 is provided to illustrate optimal user posture when seated in a standard wheelchair.

[0058] FIGS. 3-6 are provided to respectively illustrate abnormal postural conditions identified as pelvic obliquity, anterior pelvic tilt, posterior pelvic tilt and pelvic rotation; all of which are conditions that can be aided through use of the present invention.

[0059] FIG. 7 generally depicts the principal components of an adjustable wheelchair seat cushion assembly 12 in accordance with an embodiment of the present invention, and including a multi-layered resilient thermoplastic honeycomb cushion member 14 and a pivotally attached base member 16 (populated with cushion deforming elements 20, 24 and 26) forming a planar base upon which the upper cushion member 14 will rest when folded about a pivot or hinge means 18 to engage and lay upon the top of the cushion member 14 and one or more deforming elements 20, 22 and 24. Pivot means 18 is preferably a thermo-compressively formed bead-line disposed along mating rear edges 15 and 17 of the upper cushion member 14 and the base member 16, respectively. The base member 16 is preferably made of one or more layers of a more rigid thermoplastic honeycomb material.

[0060] Positioned upon the base member 16 and disposed between it and the overlying cushion member 14 are user and/or LTC therapist installable, variously sized and shaped pelvic obliquity elements 20 (FIG. 8), pommel elements 22 (FIG. 9) and/or wedge elements 24 (FIG. 10) all of which are specifically shaped and sized, cushion deforming elements (perhaps prescriptively sized and shaped by an LTC therapist to address a particular user's condition), and intended to be operative to deform or adjust the support capability of the cushion member 14 in certain ways when it is engaged therewith. As suggested by the dashed lines 25 shown in FIG. 7, additional pockets may also be provided in cushion member 14 for receiving other cushion adjusting elements (not shown) that may also be inserted into the pockets to further deform the cushion member 14 to satisfy certain special needs of a user/patient.

[0061] Once the obliquity, pommel and/or wedge elements, or the like, are positioned on and affixed to the base member 16, (and perhaps other elements inserted into the pockets 25), the cushion member 14 may be rotated downwardly about the pivot or hinge means 18 into engagement therewith and deformed thereby, and the assembly is then ready for insertion into its protective cover 30 depicted in FIG. 12. It should be noted that the cushion deformation may be more or less visible depending upon the softness or resiliency of the cushion and the degree of anatomical adjustment required by the user.

[0062] The cover 30 is preferably made of a suitable fabric material and may include an upper shell-like part 26 and a mating bottom flap part 27. Once the cushion assembly 12 is fully assembled, it may be placed on the bottom flap part 27 of cover 30 and the upper shell-like part 26 can be rotated about its fold line 29 and into its closed position partially enveloping the cushion assembly 12. Closure of the cover 30 may then be completed by zipping an upper zipper part 31, disposed around the lower edge of the shell-like part 26, into engagement with a lower zipper part 33 disposed around the exposed perimeter of the bottom flap part 27. At this point the fully assembled cushion apparatus is ready to be placed upon the user/patient's wheelchair for use.

[0063] In some cases, use of an ischial pad 23 (preferably embodied in the form of another small honeycomb pad of a particular softness, or stiffness, and generally depicted in FIG. 11) may also be required to protect the user/patient's tailbone (ischial bone). To provide such protection, a suitably configured ischial pad 23 may be inserted into a pocket 28 provided in the back-center portion of the upper shell part 26 of cover 30 to protect the patient's ischial bone.

[0064] Note also that a second zipper facility 32, or the like, may be provided in cover 30 for permitting adjustment of the cover size (expanding or contracting) required to accommodate the number and/or size of the various deforming elements used in the cushion assembly.

[0065] In FIG. 13 a multi-layered cushion member, such as that disclosed in Applicant's prior U.S. Pat. No. 5,617,595 and fully incorporated herein by reference, is shown at 14. In accordance with the present invention, the cushion member 14 is shown modified to include a lower flap or base member 16 as described above. This example is provided to more clearly illustrate attachment of the flap edge 17 by thermo-compression bonding along the rear side of the cushion member. Alternatively, the flap edge may be otherwise attached to the upper cushion member 14.

[0066] FIG. 13 illustrates in more detail a particular embodiment of a multi-layered honeycomb seat cushion constructed using multiple panels or layers of thermoplastic elastomer honeycomb materials. In this embodiment, the upper cushion member 14 is comprised of 3 layers, or panels, 40, 42, 44. The panels each include a honeycomb-like core preferably made of bonded together and expanded strips or ribbons of plastic material to which facing sheets of perhaps heavier gauge material are thermo-compression bonded. The illustrated cushion member 14 is an anisotropic three-dimensional structure having predetermined degrees of flex along the X, Y and Z axes. Each cell is formed, in part, by four generally S-shaped wall segments of the strips or ribbons each of which is bonded to adjacent strips and shared by an adjacent cell. In addition, each cell shares a double thickness wall segment with two adjacent cells. Note also that as described in our incorporated prior patents, at least some of the strips and facing sheets may be perforated, as shown at 46, to render the cushion breathable and to allow perspiration removal and cooling of the user's body. Moreover, the thermoplastic elastomeric honeycomb materials from which the cushion is fabricated may be recyclable, fast drying, and easily disinfected and sterilized.

[0067] Cushion member 14 has high tear and tensile strength and is highly resilient, with optimal compression load and shock absorption or distortion characteristics, yet is extremely light weight. Selected combinations of elastomer material, honeycomb cell configurations, core thicknesses and facing material variables determine the panel's characteristics of softness or hardness, resilient recovery rate and rigidity or flex as required for a particular application. The facing materials can be selected from a wide variety of films, including thermoplastic urethanes, foams, EVAs, rubber, neoprene, elastomer impregnated fibers and various fabrics, etc. The manufacture and fabrication of honeycomb cushions of the type utilized in the present invention to make a cushion of the type embodied in applicant's cushion member 14 is described in our prior U.S. Pat. No. 5,039,567; the disclosure thereof being expressly incorporated herein by reference.

[0068] In accordance with the present invention, and as generally described above, the base member 16 is preferably made of at least one relatively thin sheet of more rigid honeycomb material, and has a rear edge 17 thereof hingedly connected to the back of the cushion member 14, preferably along it's rearmost extremity. Removably disposed between the base member 16 and the cushion member 14, and preferably attached, by suitable means, such as Velcro or other hoop and loop materials or the like, to the upper surface of the base member 16 at predefined locations, are one or more cushion deforming elements selected to define the user support characteristics of the cushion assembly. The cushion deforming elements may be generally described as an assortment of prescriptively sized and shaped pelvic obliquity elements 20, pommel elements 22 and/or wedge elements 24 as illustrated herein in FIGS. 8-10.

[0069] These elements are selected, positioned and secured by the user and/or assisting therapist or clinician on the upwardly facing base member surface so as to deform, or alter the support characteristics of the overlying resilient cushion member 14 to raise, lower, align, orient or otherwise adjust the user's skeletal components supported by the cushion assembly to provide pelvic and trunk stability, maximize the user's comfort and function during ADLs, protect the user's skin and prevent wounds, assist in the healing of existing wounds, minimize unwanted movement of the user on the cushion surface, correct or accommodate postural abnormalities and/or prevent or mediate progression of postural abnormalities.

[0070] As generally described below, these elements are adapted to deform the cushion member 14 as it is lowered (folded down) into supporting engagement therewith. The preformed obliquity elements 20, pommels 22 and/or wedges 24 are carefully selected and positioned to provide a desired customizing deformation or adjustment of the overlying cushion member 14 so that the cushion in turn provides the supporting needs of the user when the assembly is folded into its closed, or folded, configuration.

[0071] Once folded, the cushion assembly 12 is inserted into an enveloping fabric cover 30, such as that generally illustrated in FIG. 12, that is configured to conform to the shape of the cushion assembly and is provided with perimeter zippering means, or the like, to securely house the cushion assembly and maintain it in its closed and functional configuration. As pointed out above, the cover 30 may also be provided with internal and/or external pockets for receiving additional ischial pads, pommels or wedges, etc.

[0072] In FIGS. 14 and 15, side views of the above described cushion assembly 12 in its open and closed configurations are shown in more detail.

[0073] In FIG. 16 a frontal view is depicted in somewhat exaggerated perspective to emphasize the distortion of the cushion member 14 by the several underlying elements.

[0074] And finally, in FIG. 17, a partially broken side view of the fully assembled anatomical support and seat cushion apparatus is shown further illustrating the cushion assembly 12 disposed within its fabric cover 30. Note that a closing zipper 31, 33 is provided around three sides of the lower edge of the cover, and a second, medially disposed expansion zipper and excess material facility 32 is suggested to accommodate an assembly of larger or smaller cushion deforming elements should that be necessary.

[0075] Although embodiments of the present invention have been disclosed above, it will be appreciated that numerous alterations and modifications thereof will no doubt become apparent to those skilled in the art after having read the above disclosure. For example, the anatomical support cushions may be configured in any appropriate shape, with multiple panels and with various combinations of perforated and non-perforated core panels, and with core walls and/or face sheet perforations the number and/or hole size of which are tailored to achieve desired damping, cleaning and sanitizing characteristics. In addition, means other than the disclosed thermo-compression bead and closable cover can be provided for holding the several components in engaging relationship after the deforming elements have been attached to the base member and brought into deforming engagement with the cushion member. It is therefore intended that the following claims may be interpreted as covering all such alterations and modifications as fall within the true spirit and scope of the invention.