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Iterative solution for the pressure and flow from a porous membrane catheter for uniform tissue outside. The fluid is entering the catheter from the positive (right) side. Pressure within the lumen (a) and outflow (b) are fairly constant along the length of the catheter (+2.5 to − 2.5) and falls off quickly proximally and distally in the 10 cms of the abscissa shown in (c).
