A simple instrument to characterize convective and diffusive transport of single hollow fibers of short length

The use hollow fiber membranes for cell encapsulation is being developed as an experimental transplantation technology in which a permselective membra ne physically isolates grafted cells from directly interacting with host ce lls or tissue. Although laboratory characterization of commercial ultrafilt ration and dialysis membranes using multi-fiber test modules is well establ ished, a simple apparatus for characterizing the transport properties of sm all individual segments of hollow fiber membrane has not been described. In the current study, we describe an instrument for evaluating the diffusive and convective transport characteristics of individual cell encapsulation m embranes at size scales typically used in animal and human clinical studies . The performance capabilities of the instrument are described, as well as methods for determining hydropermeability, diffusive permeability, and solu te rejection. (C) 2001 Published by Elsevier Science B.V.