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High-Performance Silicon Nanopore Hemofiltration Membranes.

William H Fissell1, Anna Dubnisheva, Abigail N Eldridge

  • 1Departments of Nephrology and Hypertension, Cleveland Clinic, Cleveland, Ohio.

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|January 8, 2010
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Summary

This study developed a silicon nanopore membrane for hemofiltration, showing it effectively filters blood and inhibits clotting. This breakthrough demonstrates the potential for advanced silicon-based renal replacement devices.

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Nanotechnology

Background:

  • Silicon micromachining enables precise nanoscale features for implantable medical devices.
  • Concerns exist regarding the blood biocompatibility of silicon materials for hemodialysis and hemofiltration.

Purpose of the Study:

  • To fabricate and evaluate a high-performance, ultrathin hemofiltration membrane using silicon nanopore technology.
  • To assess the biocompatibility and performance of the membrane surface-modified with poly(ethylene glycol) (PEG).

Main Methods:

  • Fabrication of an ultrathin hemofiltration membrane with monodisperse slit-shaped pores using a sacrificial oxide technique.
  • Surface modification of the silicon membrane with poly(ethylene glycol) (PEG).
  • Evaluation of fluid and macromolecular transport, protein adsorption, fouling, thrombosis, and hydraulic permeability during prolonged hemofiltration experiments.

Main Results:

  • The PEG-modified silicon nanopore membrane exhibited fluid and macromolecular transport consistent with model predictions.
  • Protein adsorption, fouling, and thrombosis were significantly inhibited by the PEG surface modification.
  • The membrane maintained hydraulic permeability and molecular selectivity throughout a 90-hour hemofiltration experiment with bovine whole blood.

Conclusions:

  • This work reports the first successful prolonged hemofiltration using a silicon nanopore membrane.
  • The results demonstrate the feasibility of using these silicon membranes and PEG modification for advanced renal replacement devices.
  • The developed membrane shows promise for miniaturized, implantable medical devices requiring high biocompatibility and performance.