| 摘要 |
<p>A two piece roller clamp for regulating the fluid flow rate through plastic tubing (16) by defining the size of the tubing lumen. A recurring problem in the prior art is that of the tendency of the tubing wall to cold flow when compressed under pressure which consequently alters the cross sectional areas of the lumen and, therefore, the fluid flow rate. The instant invention solves this problem by its construction which allows the roller to engage the tubing with a uniform force as the roller is moved longitudinally along the body. The clamp includes a U-shaped body (10) with a base (12) and two side walls (11) and a longitudinally movable roller (13) mounted in tracks (15) formed in the side walls. The roller (13) is biased against the roller bearing surface (22) running along the length of the base. Adjacent to the roller bearing surface (22) is a tube compression slot (30) having a lower wall (32) uniformly spaced below the roller. A channel (35) of varying cross-section is provided in the lower wall (32) of the tube compression slot. The roller (13) exerts a uniform, but minimal force on the tubing compressing it against the lower wall (32) of the slot (30) permitting the formation of a lumen defined by the contours of the channel (35). </p> |
