Patent ID: 8123676

Claim:
An anti-extravasation sheath comprising: a tube characterized by a distal portion, a proximal portion, an inner surface, and an inner diameter; wherein the inner diameter of said tube is sized and dimensioned to permit fluid flow between the inner surface of the tube and an outer surface of an arthroscopic instrument when the arthroscopic instrument is disposed within the tube; a plurality of ribs extending inwardly from the inner surface of the tube and running longitudinally along the tube; at least one drainage lumen running longitudinally along the tube and disposed within the ribs; wherein the ribs form a seal between the outer surface of the arthroscopic instrument and the ribs when an arthroscopic instrument is inserted into the tube; wherein said ribs further define outer lumens between the outer surface of the arthroscopic instrument and the inner surface of the tube; at least one inflow/outflow hole disposed on the distal portion of the tube in fluid communication with at least one outer lumen defined between the outer surface of the arthroscopic instrument and the inner surface of the tube when the arthroscopic instrument is disposed within the tube; and at least one drainage aperture disposed on the central portion of the tube in fluid communication with at least one drainage lumen.