Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Cuprophan® hollow fibers

Hollow Fiber with Sorbent Walls. A cellulose sorbent and dialy2ing membrane hoUow fiber was reported in 1977 by Enka Glan2stoff AG (41). This hoUow fiber, with an inside diameter of about 300 p.m, has a double-layer waU. The inner waU consists of Cuprophan ceUulose and is very thin, approximately 8 p.m. The outer waU, which is ca 40-p.m thick, consists mainly of sorbent substance bonded by ceUulose. The advantage of such a fiber is that it combines the principles of hemodialysis with those of hemoperfusion. Two such fibers have been made one with activated carbon in the fiber waU, and one with aluminum oxide, which is a phosphate binder (also see Dialysis). [Pg.155]

Bemberg AG of Germany) shifted the production to that of hemodialysis membranes in the form of flat sheets and hollow fibers. The membrane products are known under the name Cuprophan and are produced by Membrana, a division of AKZO Nobel Fibres [13,75]. [Pg.1496]

In dialysis, size exclusion is the main separation mechanism, while osmotic pressure and concentration difference drive the transport across two typically aqueous phases. While dialysis is used in some analytical separations, dialysis for the removal of toxins from blood (hemodialysis) is the most prominent application for hollow fiber technology in the biomedical field. The hemodialyzers are used to treat over one million people a year and have become a mass produced, disposable medical commodity. While the first hemodialyzers were developed from cellulosic material (Cuprophane, RC, etc.), synthetic polymers such as polyacrylonitrile, poly(ether) sulfone, and polyvinyl pyrrolidone are increasingly used to improve blood compatibility and flux. Hemodialyzer modules consist of thousands of extremely fine hollow fibers... [Pg.1262]

A major objective of fundamental studies on hollow-fiber hemofliters is to correlate ultrafiltration rates and solute clearances with the operating variables of the hemofilter such as pressure, blood flow rate, and solute concentration in the blood. The mathematical model for the process should be kept relatively simple to facilitate day-to-day computations and allow conceptual insights. The model developed for Cuprophan hollow fibers in this study has two parts (1) intrinsic transport properties of the fibers and (2) a fluid dynamic and thermodynamic description of the test fluid (blood) within the fibers. [Pg.75]

Figure 6.12a-c shows the AFM images near the inner surface, middle section, and near the outer surface, respectively, of the hollow fiber fabricated at a 70-cm air gap. Figure 6.12d-f shows the three-dimensional AFM images near the inner surface, middle section, and near the outer surface, respectively, of the same hollow fiber. The arrow in Fig. 6.12a shows the direction from the inner surface toward the outer surface. Fig. 6.12a suggests that nodules are in a row, in the direction perpendicular to the arrow, and are compacted in comparison with the middle section (Fig. 6.12b) and with the area near the outer surface (Fig. 6.12c). The area near the outer surface seems very coarse, and the nodules are fused with each other. The dark space indicates the pores. Similar AFM pictures were obtained for the other studied membranes. The surprising observation is that the nodules are not at random as reported by Fujii et al. [13], but ahgned to the angular direction. The AFM picture of the middle section is very similar to those observed by Fujii et al. [13] in the middle section of Cuprophan, PMMA B-1, and PAN hollow fiber membranes when studied by FE-SEM technique. Figure 6.12a-c shows the AFM images near the inner surface, middle section, and near the outer surface, respectively, of the hollow fiber fabricated at a 70-cm air gap. Figure 6.12d-f shows the three-dimensional AFM images near the inner surface, middle section, and near the outer surface, respectively, of the same hollow fiber. The arrow in Fig. 6.12a shows the direction from the inner surface toward the outer surface. Fig. 6.12a suggests that nodules are in a row, in the direction perpendicular to the arrow, and are compacted in comparison with the middle section (Fig. 6.12b) and with the area near the outer surface (Fig. 6.12c). The area near the outer surface seems very coarse, and the nodules are fused with each other. The dark space indicates the pores. Similar AFM pictures were obtained for the other studied membranes. The surprising observation is that the nodules are not at random as reported by Fujii et al. [13], but ahgned to the angular direction. The AFM picture of the middle section is very similar to those observed by Fujii et al. [13] in the middle section of Cuprophan, PMMA B-1, and PAN hollow fiber membranes when studied by FE-SEM technique.
Cuprophan Hollow fibers were supplied from SORIN Biomedica,S.p.A. [Pg.389]


See other pages where Cuprophan® hollow fibers is mentioned: [Pg.143]    [Pg.457]    [Pg.155]    [Pg.456]    [Pg.462]    [Pg.241]    [Pg.95]   
See also in sourсe #XX -- [ Pg.389 ]




SEARCH



Fiber hollow

© 2024 chempedia.info