Sitting device for prevention of spinal diseases

Abstract

A sitting device for prevention of spinal diseases comprises a padded member, a thin pad extended forwardly from the padded member, and a hard block fully inserted inside the padded member. The padded member has a generally right triangular shape, and is made of resilient materials. The hypotenuse surface of the padded member is undulating ergonomically. The hard block is made of a non-resilient material, and is able to tolerate, without rupturing, the gravity force on a mass of an adult's body with a shape and size similar to those of the adult's buttocks. The hard block is inserted completely inside the right angle area of the padded member. The height of the front side of the hard block is greater than the distance from the lowest point of the sitter's coccyx to the lowest point of his tuberosity of ischium. Both the padded member and the hard block have a flat bottom side to ensure stability.

1 . (canceled) 
     
     
         2 . (canceled) 
     
     
         3 . A sitting device for prevention of spinal diseases comprising:
 a padded member having a width, a flat bottom, a rearward portion having a height, a forward portion having a height less than the height of the rearward portion, and an undulating upper hypotenuse surface running from the rearward portion downwardly to the forward portion;   a thin pad having width, and a length extended forwardly from the forward portion of the padded member, the width and length of the thin pad being selected such that that a sitter can sit in a leg-folding posture fully on the hypotenuse surface of the padded member and the thin pad without touching a surface upon which the sitting device is placed; and   a hard block made of a non-resilient material located inside the rearward portion of the padded member, the hard block having a width substantially equal to the width of the padded member, a top surface of the hard block having a highest area having a height T at a rear side of the hard block, a flat bottom, and a plateau area having a height H at a front side of the hard block, the height H of the plateau area being less than the height T of the highest area, the height H of the plateau area being selected to be greater than a distance from a lowest point of an adult sitter's coccyx to a lowest point of the adult sitter's tuberosity of ischium;   such that when a sitter is sitting with the sitter's buttocks on the hypotenuse surface of the padded member with the sitter's sacrum over the highest area of the hard block, and with the sitter's folded legs on the thin pad, the sitter's coccyx rests on the plateau area of the top surface of the hard block, and the sitter's ischium is held adjacent to the front side of the hard block.   
     
     
         4 . The sitting device of  claim 3 , in which the non-resilient material of the hard block is selected from a group consisting of wood, polystyrene foam, and hard rubber. 
     
     
         5 . The sitting device of  claim 3 , in which the non-resilient material of the hard block is selected such that the hard block can support the mass of an adult's body without rupturing. 
     
     
         6 . The sitting device of  claim 3 , in which the hard block has a flat bottom. 
     
     
         7 . The sitting device of  claim 3 , in which the padded member has a generally right triangular shape from the side. 
     
     
         8 . The sitting device of  claim 3 , in which the hypotenuse surface of the padded member has an ergonomically undulating contour which steps downward in height from a highest portion at the rearward portion of the padded member to a plateau portion, a concave middle portion, to a lowest height at the forward portion. 
     
     
         9 . The sitting device of  claim 3 , in which the padded member is made of resilient material. 
     
     
         10 . The sitting device of  claim 9 , in which the resilient material of the padded member is selected from a group consisting of foam, rubber, and cotton. 
     
     
         11 . The sitting device of  claim 3 , in which the padded member has a flat bottom.