Patent ID: 8096928

Claim:
An arrangement for treatment of the back, said arrangement comprising: a base, said base having an upper surface with a low coefficient of friction sufficient to allow a user's posterior to slide/glide slightly without significant resistance, said base being arranged in a substantially horizontal arrangement; a backrest, said backrest being attached at a first end of said base, substantially perpendicular to said base, and in a substantially vertical arrangement; a footplate attached at a second end of said base, substantially perpendicular to said base, and in a substantially vertical arrangement; and a spring arrangement, wherein said spring arrangement is disposed against said backrest above said base so that when a user sits on said base, and presses against said footplate, the posterior of the user glides along said upper surface of said base with the lower back pressing against said spring arrangement, wherein said springs are selected to have a spring constant (k) so that a force of 222-889 Newtons results in compression of said springs more than 20% deflections and less than 80% deflection when a user presses their feet into said footplate forcing their lower back along said upper surface of said base into said spring arrangement.