Patent ID: 8231175

Claim:
A functionally dynamic orthopaedic chair comprising: a dynamic seating platform having top and bottom surfaces and having a vertical axis passing therethrough, wherein the bottom surface is defined by an outer edge and is hemispherical; a base portion having upper and lower ends, and a receiving element disposed in said upper end and being defined by an outer edge and configured as a hemispherical bowl cooperative with said bottom surface of said dynamic seating platform such that the bottom hemispherical surface of the dynamic seating platform and the hemispherical bowl of the receiving element are in direct movable contact theretogether, and wherein the dynamic seating platform is otherwise not interconnected with said receiving element; a retaining element disposed about the outer edge of one of at least one of either the receiving element and the base portion such that the retaining element engages the outer edge of said dynamic seating platform from pivoting beyond a pre-designated number degrees past horizontal thereby preventing further movement in said direction; and wherein the dynamic seating platform is capable of pivoting within said receiving element in any direction about its vertical axis such that a user must actively engage the muscles in the back and abdomen to support the upper body when seated on the top surface of said dynamic seating platform.