Pressure drop through generic lumens of hemodialysis catheters.

A unique, air-based system has been developed and implemented for rapid and accurate determination of pressure drop versus flow rate characteristics of generic catheter lumens; dimensionless scaling parameters can be effectively used to express these characteristics in units of blood flow used in the clinical setting. Theoretical models are compared with experimental data. For flow and geometric parameters of practical importance, the pronounced effect of developing flow in the lumen must be accounted for in calculation of the pressure drop along the lumen.