The Prosorba Column is a Plasma filtering device used to treat severe cases of Rheumatoid Arthritis

Rheumatoid arthritis

Rheumatoid arthritis is a chronic, systemic inflammatory disorder that may affect many tissues and organs, but principally attacks synovial joints. The process produces an inflammatory response of the synovium secondary to hyperplasia of synovial cells, excess synovial fluid, and the development...

 or Psoriatic Arthritis

Psoriatic arthritis

Psoriatic arthritis is a type of inflammatory arthritis that, according to the National Psoriasis Foundation, will develop in up to 30 percent of people who have the chronic skin condition psoriasis...

. Its active element is Protein A bonded to a diatomaceous earth/clay bead . The effect of the Protein A is to remove circulating immune complexes responsible for the autoimmune joint deterioration process.

The Prosorba Column went out of production at the end of 2006.