DISPOSITIF REGULATEUR DE DEBIT DE FLUIDE

摘要

A medical tubing clamp with a movable roller in a U-shaped body to progressively pinch a plastic tube to control flow rates of blood or parenteral solution delivered to a patient. The clamp has a greatly improved resistance to flow rate "drift" because the clamp pinches the tube in a very special way. The clamp externally squeezes opposite side portions of the tube to a greater extent than a longitudinal central portion of the tube when partially collapsing the tube. The clamp does this with a pair of ledge surfaces either on the clamp body or roller and these ledge surfaces are separated by a groove that receives the longitudinal central portion of the tube. In this manner plastic cold flow distortion or relaxation with time at the highly stressed opposite side portions of the tube is isolated from the longitudinal central portion allowing the clamp to more closely hold its initial flow rate setting.