Ergonomic cushion for lower back

Abstract

An ergonomic seat cushion is provided. The cushion comprises a top surface, a bottom surface with lateral, front and rear sides. The cushion also comprises a “U” shaped indentation or cut out on the rear side. The cushion also comprises variable front and rear cushion heights providing a slant shape. The “U” shaped cut out alleviates pressure on a coccyx region of a user. An upholstery foam incorporated into the seat cushion is resilient and dense, is directed to maintain form and structure of the cushion after prolonged use and is further directed to preventing undesirable flattening and enable the cushion to consistently regain its original shape.

What is claimed is: 
     
         1 . An ergonomic seat cushion comprising:
 a top surface, a bottom surface with lateral, front and rear sides;   a “U” shaped indentation or cut out on the rear side; and   variable front and rear cushion heights providing a slant shape.   
     
     
         2 . The system of  claim 1 , wherein the “U” shaped cut out alleviates pressure on a coccyx region of a user. 
     
     
         3 . The system of  claim 1 , wherein an upholstery foam incorporated into the seat cushion is resilient and dense, is directed to maintain form and structure of the cushion after prolonged use and is further directed to preventing undesirable flattening and enable the cushion to consistently regain its original shape. 
     
     
         4 . The system of  claim 1 , wherein the upholstery foam is at least one a memory foam, a viscoelastic polyurethane foam and a gel. 
     
     
         5 . The system of  claim 1 , wherein a length gap ratio of the “U” shaped indentation or cut out falls within a range of 0.25 to 0.50 and a width gap ratio falls within a range of 0.25 to 0.50. 
     
     
         6 . The system of  claim 5 , wherein the length gap ratio and the width gap ratio of the rear cut out is with regard to a side width of the cushion. 
     
     
         7 . The system of  claim 5 , wherein the length gap ratio is calculated as a length gap divided by length and wherein the width gap ratio is calculated as a width gap divided by width. 
     
     
         8 . The system of  claim 7 , wherein a ratio below 0.25 inadequately addresses relief needs for overweight users during prolonged sitting and wherein a ratio surpassing 0.50 presents structural problems in which a user tailbone is at risk of touching a surface upon which the cushion is placed. 
     
     
         9 . The system of  claim 1 , wherein a back of the cushion has a minimum height of three to seven inches, wherein a front of the cushion has a minimum height up to 2 inches, and wherein height variations are directed to preserving structural balance of the cushion. 
     
     
         10 . The system of  claim 9 , wherein the front and rear height variations lead to formation of a slant near the “U” shaped cut out. 
     
     
         11 . The system of  claim 10 , wherein the slant is designed to promote that a user tailbone remains clear of contact with an underlying surface. 
     
     
         12 . The system of  claim 1 , wherein alternatively the indentation or cut out is “V” shaped. 
     
     
         13 . An ergonomic seat cushion housing a sensor system to measure pressure distribution across its surface, the system directed to monitoring of pressure at various locations of the cushion.