Figure 5.

Effect of water flush on 16 Fr Salem Sump tubes in vitro. The top row shows entire tubes (a) filled with Osmolite, before flush, and (b) after 30 mL water flush, with diluted Osmolite present above the proximal aperture (arrow). More concentrated Osmolite is present within the distal chamber of the tube. The bottom row shows the proximal (top) and distal (bottom) ends of tubes after a 60 mL water flush. (c) The tube is better cleansed above the proximal aperture (arrow), but the distal compartment contains relatively concentrated Osmolite. (d) A silicone plug (arrow) was placed just distal to the proximal aperture, so Osmolite could not reach the distal chamber directly from the infusion channel. After a 60 mL water flush, the proximal tube is cleansed, but the distal chamber contains Osmolite.