Patent Issued for Flushing stylet (USPTO 11738170).

"Many hemodialysis catheters include multiple lumens, such as dual or triple-lumen catheters. The stylet is movable within the lumen to a position in which the first and second blocking dams are, respectively, proximal and distal to the at least one side opening of the catheter and each of the first and second blocking dams is sealingly engaged with the inner surface of the catheter such that fluid introduced into the lumen, from the passage and through the at least one aperture of the stylet, is directed through the at least one side opening of the catheter. Generally, the lumen through which fluid is withdrawn is referred to as the "arterial" lumen, and the lumen through which fluid is returned is referred to as the "venous" lumen. [Extracted from the article]