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TECHNICAL PAPERS

Effect of Vessel Compliance on the In-Vitro Performance of a Pulsating Respiratory Support Catheter

[+] Author and Article Information
Monica Y. Garcia

Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA

Brack G. Hattler

McGowan Institute for Regenerative Medicine, Department of Surgery, University of Pittsburgh, Pittsburgh, PA

William J. Federspiel

McGowan Institute for Regenerative Medicine, Department of Chemical Engineering, Department of Surgery, Department of Bioengineering, University of Pittsburgh, Pittsburgh, PA

J Biomech Eng 124(1), 56-62 (Sep 17, 2001) (7 pages) doi:10.1115/1.1428556 History: Received January 11, 2001; Revised September 17, 2001
Copyright © 2002 by ASME
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References

Figures

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Experimental setup used to measure specific compliance of bovine vena cava segments and custom fabricated elastic tubes
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In-vitro bench circuit for evaluation of gas exchange performance of respiratory support catheter using either rigid tube or custom compliant tube
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Typical pressure-volume curves of excised bovine vena cava (a) and fabricated polyurethane tube (b). The data represent the mean ±SD obtained from 3 cycles.
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Compliance curves obtained from experimentation with five bovine vena cava segments (a) and five polyurethane tubes (b). At physiological venous pressure (5–15 mmHg) the compliance of the custom tube is comparable than the vena cava compliance.
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Oxygen (a) and carbon dioxide (b) exchange rates in nine experiment of a respiratory support catheter placed in rigid tube and custom compliant tube. The mean flowrate through the test section was maintained at 3.0 liters/minute over the range of pulsation rates. The gas exchange rates had been normalized to the surface area of the respiratory support catheter (A=0.21 m2 ); VCO2 also normalized to an inlet PCO2 of 50 mmHg. The difference in gas exchange in the model compliant vessel versus rigid tube was compared by Student’s t test (statistically difference at P<0.05* ).
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Mean pressure drop and transmural pressure across the vessels test section measured over the range of pulsation rate
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Respiratory support catheter into the custom compliant vessel during balloon pulsation at 0 bpm (a), 60bpm (b) and 240 bpm (c)

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