Flexible elastic tubing with star section profile - for damping hydrostatic pressure variations, esp. for smooth blood recirculation system pressures from peristaltic pumps

摘要

A device for damoing pressure variations in blood being recirculated externally by a mechanical pump comprises a flexible elastic tube with a section profile resembling a multiple point star with circumferentially collapsed peak. At low pressure, the tube offers a relatively small, unrestricted bore, but the radial ribs diverge and dilate the bore in response to rising pressure, increasing the tube capacity used thus damping the flow surge. For use with e.g. dialysis units using peristaltic pumps which induce sinusoidal hydrostatic pressure variations. Simple in mfr. and use, the star section tubing is oref. made of PVC contg. 30-40% plasticiser (unspecified).