Annals of Biomedical Engineering

, Volume 46, Issue 5, pp 762–771 | Cite as

Effects of Hollow Fiber Membrane Oscillation on an Artificial Lung

  • Ryan A. Orizondo
  • Guy Gino
  • Garret Sultzbach
  • Shalv P. Madhani
  • Brian J. Frankowski
  • William J. Federspiel
Article
  • 110 Downloads

Abstract

Gas transfer through hollow fiber membranes (HFMs) can be increased via fiber oscillation. Prior work, however, does not directly translate to present-day, full-scale artificial lungs. This in vitro study characterized the effects of HFM oscillations on oxygenation and hemolysis for a pediatric-sized HFM bundle. Effects of oscillation stroke length (2–10 mm) and frequency (1–25 Hz) on oxygen transfer were measured according to established standards. The normalized index of hemolysis was measured for select conditions. All measurements were performed at a 2.5 L min−1 blood flow rate. A lumped parameter model was used to predict oscillation-induced blood flow and elucidate the effects of system parameters on oxygenation. Oxygen transfer increased during oscillations, reaching a maximum oxygenation efficiency of 510 mL min−1 m−2 (97% enhancement relative to no oscillation). Enhancement magnitudes matched well with model-predicted trends and were dependent on stroke length, frequency, and physical system parameters. A 40% oxygenation enhancement was achieved without significant hemolysis increase. At a constant enhancement magnitude, a larger oscillation frequency resulted in increased hemolysis. In conclusion, HFM oscillation is a feasible approach to increasing artificial lung gas transfer efficiency. The optimal design for maximizing efficiency at small fiber displacements should minimize bundle resistance and housing compliance.

Keywords

Oxygenator design Respiratory support Extracorporeal membrane oxygenation 

Notes

Acknowledgments

This work was supported by National Institutes of Health Grant Number R01HL117637 and the McGowan Institute for Regenerative Medicine. William J. Federspiel (an author of this work) is the Head of the Scientific Advisory Board and an Equity Holder in ALung Technologies. The other authors of this work have no pertinent financial relationships to disclose.

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Copyright information

© Biomedical Engineering Society 2018

Authors and Affiliations

  • Ryan A. Orizondo
    • 1
  • Guy Gino
    • 2
  • Garret Sultzbach
    • 1
  • Shalv P. Madhani
    • 1
    • 3
  • Brian J. Frankowski
    • 1
  • William J. Federspiel
    • 1
    • 3
    • 4
    • 5
  1. 1.McGowan Institute for Regenerative MedicineUniversity of PittsburghPittsburghUSA
  2. 2.ORT Braude College of EngineeringKarmielIsrael
  3. 3.Department of BioengineeringUniversity of PittsburghPittsburghUSA
  4. 4.Department of Chemical and Petroleum EngineeringUniversity of PittsburghPittsburghUSA
  5. 5.Department of Critical Care MedicineUniversity of Pittsburgh Medical CenterPittsburghUSA

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