Portable orthopedic seat cushion
FIG. 1 is a top plan view of a portable orthopedic seat cushion showing my new design; 
     FIG. 2 is a bottom plan view thereof; 
     FIG. 3 is a side elevational view thereof; 
     FIG. 4 is an end view thereof, as viewed from the top of FIG. 1; and, 
     FIG. 5 is an end view thereof, as viewed from the bottom of FIG. 1.