Vacuum/heat formed cushion supported on a fluid permeable manifold

• US 5,561,875 A
• Filed: 10/25/1994
• Issued: 10/08/1996
• Est. Priority Date: 02/20/1992
• Status: Expired due to Term

• Current Assignee: Roho Incorporated (Permobil Holding AB)
• Original Assignee: Crown Therapeutics, Inc.
• Inventors: Graebe, Robert H.
• Primary Examiner(s): Grosz, Alexander
• Application Number:
  US08/328,724
• Time in Patent Office: 714 Days
• Field of Search: 5/423, 5/421, 5/469, 5/468, 5/654, 5/653, 5/449, 5/453, 5/455, 297/180.13, 297/180.1
• US Class Current: 5/423
• CPC Class Codes: A61G 5/1043 Cushions specially adapted for wheelchairs
• CPC Class Codes: A61G 5/1045 for the seat portion
• CPC Class Codes: A61G 5/1091 Cushions, seats or abduction devices
• CPC Class Codes: A61G 7/05707 with integral, body-bearing projections or protuberances
• CPC Class Codes: A61G 7/05715 with modular blocks, or inserts, with layers of different material

Abstract

A vacuum or heat formed cushion having upstanding cells of thin (15-40 mil) wall thickness and having rectangular body sections with upwardly inclined (10°-40°) triangular top panels. The cushions can be attached together to form a mattress or used individually as a wheelchair or other chair or back cushion. The cells of the cushion can all be interconnected or the cushion can be divided in two or more independently inflated compartments. A special wheelchair cushion has cells of different shapes, sizes and heights to promote positioning of a user on a wheelchair. The cushion has openings through the base to allow it to be placed on a manifold so that body fluids can drain away from the patient and conditioned air can be supplied to the patient. The manifold has a top surface on which the cushion rests, side walls engaging the support surface to define an open area beneath the cushion, and a series of open segments in the top of the manifold aligned with the openings through the cushion base to allow air to be passed to and withdrawn from the area of the patient and to allow patient body fluids to drain into the manifold. The top surfaces of the cells are textured to prevent sealing off the pores of the user'"'"'s skin.

Claims

1. In combination

(a) a support structure having a support surface,

(b) an integral inflatable cushion located above the support surface,

(c) a manifold positioned between the support surface and the cushion,

(d) the cushion comprising a flexible thermoplastic gas impervious bottom wall, a preformed flexible gas imperious thermoplastic top sheet defining a series of air cells, said air cells having been vacuum or heat formed into molds, seals attaching the top sheet to the bottom wall at the edges of the air cells except for limited interconnections between selected air cells whereby air from one cell is moveable to adjacent cells, and valve means connected to at least one air cell to allow air to be added to or released from the cell, openings through the base of the cushion adjacent to the corners of the cells to allow body fluids of the user to pass through the cushion and conditioned air to be supplied from a remote source to the body of the user,

(e) the manifold having an upper surface on which the cushion rests, side walls engaging the support structure, an open area beneath the cushion accommodating a series of open segments in the top of the manifold aligned with the openings through the cushion base to allow air to be passed to and withdrawn from the area of the patient and to allow patient body fluids to drain into the manifold, and a connection to a remote source of conditioned air.

2. The combination of claim 1 including an absorbent pad positioned between the manifold and the support surface to collect body fluids which pass from the user through the openings in the base of the cushion.

3. In combination

(a) support structure having a support surface,

(b) a cushion located above the support surface,

(c) a manifold positioned between the support surface and the cushion,

(d) the cushion comprising a base and a series of upstanding flexible cellular members extending upwardly from the base, openings through the base to allow body fluids of the user to pass through the cushion and conditioned air to be supplied to the body of the user,

(e) the manifold having a top surface on which the cushion rests, side walls engaging the support structure, an open area beneath the cushion accommodating a series of open segments in the top of the manifold aligned with the openings through the cushion base to allow air to be passed to and withdrawn from the area of the patient and to allow patient body fluids to drain into the manifold.

4. The combination of claim 3 including an absorbent pad positioned between the manifold and the support surface to absorb body fluids which pass from the user through the openings in the base of the cushion.

5. The combination of claim 3 including means for releasibly attaching the cushion to the manifold.

6. The combination of claim 3 wherein the cushion is a mattress comprised of a series of individual cushions attached along their side edges.

7. The combination of claim 6 wherein the cushion bases and the upstanding members are formed from gas impervious film and the upstanding members are air cells, the cushions each being divided into side by side compartments, each independently inflatable, whereby the mattress can be provided with one longitudinal side inflated to a pressure different from the other longitudinal side.

8. The combination of claim 6 wherein the cushion bases and the upstanding members are formed from gas impervious film and the upstanding members are air cells, the cushions each having large continuous edge cells along the longitudinal edges of the cushions with smaller center air cells therebetween, the structure providing edge resistance to rolling off the mattress.

9. The cushion of claim 8 wherein the edge cells are pneumatically independent of each other and of the center cells.

10. The cushion of claim 8 wherein the edge cells are pneumatically connected to the center cells,

11. The cushion of claim 10 wherein the pneumatic connection between the edge cells and the center cells is substantially restricted compared to the pneumatic interconnection among the center cells.

12. The combination of claim 3 including an expanded plastic foam pad positioned over the top surface of the upstanding cellular members.

13. The combination of claim 3 including a cover enclosing the cushion and the manifold and engaging the support surface.

14. The combination of claim 3 wherein the cushion base and the upstanding members are formed from gas impervious film and the upstanding members are air cells, at least some of which are interconnected whereby air from one cell is movable to adjacent cells, the cushion also including valve means for adding or releasing air from the cells.

15. The combination of claim 14 wherein the interconnections between air cells are restricted passages in the base.

16. The combination of claim 14 wherein the air cells have a substantially rectangular lower portion and an upper portion substantially pyramidal in shape, the cushion defining a substantially level continuous upper contact surface when inflated to provide substantially equal forces against all parts of the anatomy of the person positioned on the cushion.

17. The combination of claim 16 wherein the cell tops are provided with textured areas to prevent sealing off the pores of the skin of the user of the cushion by the cushion.

18. The combination of claim 3 wherein the manifold includes means for connecting the manifold to a remote source of conditioned air.

19. The combination of claim 3 wherein the inflatable cushion comprises a flexible first base sheet having a flexible margin around the periphery, flexible air cells having a closed top and open bottom and connected to each other by webs adjacent to the open bottom to define a second flexible sheet also having a margin around the periphery, the second flexible sheet being attached to the first flexible sheet at the web members and the peripheral edges whereby the air cells are attached to and projecting outwardly from the base sheet to form an array, the interiors of at least some of the air cells being in communication through the first and second flexible sheets to equalize the air pressure within the interconnected air cells, and an inflating tube and valve in the peripheral edges.

20. The combination of claim 19 wherein the inflating tube and valve comprises a rigid tube having exterior ribs at one end which are engaged by and secured to the peripheral edges of the first and second sheets in an air tight seal, and an open and closable air valve positioned at a second end of the tube in an air tight seal, whereby said valve can be opened to inflate or deflate the mattress and closed to trap air in the mattress air cells.