TITLE

Hydrodynamics of the new Medos aortic cannula

AUTHOR(S)
Gerdes, A; Hanke, T; Sievers, H-H
PUB. DATE
May 2002
SOURCE
Perfusion;May2002, Vol. 17 Issue 3, p217
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Background: Postoperative neurologic complications in cardiac surgery patients are considered to be associated with the design of an aortic cannula and its hydrodynamic profile. To gain knowledge about the hydrodynamics of a new cannula type, based on the integration of a helical stator in its tip, was the aim of the present study. Methods: Pressure gradients and back pressures of the new Medos aortic cannula were measured and compared with a commonly used single-stream cannula at varying flow rates in a mock circulation. Additionally, flow visualization was performed by ink injection. Results: Pressure gradients across the Medos cannula were 25.5-31.8% lower at all flow rates measured when compared to the reference cannula. Back pressures of the Medos cannula were 64.1-67.9% lower than reference back pressures. Conclusions: The Medos cannula provides improved hydrodynamic characteristics, probably reducing the risk of atherosclerotic embolism and cerebral malperfusion by avoidance of high back pressures and sandblasting effect.
ACCESSION #
6747081

 

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