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The effect of internal profile on cannula outflow

Shafii, Nadia Shaira and Darlis, Nofrizalidris and Dillon, Jeswant and Osman, Kahar and Md. Khudzari, Ahmad Zahran (2014) The effect of internal profile on cannula outflow. WSEAS Transactions on Fluid Mechanics, 9 (1). pp. 187-195. ISSN 1790-5087

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Official URL: http://www.wseas.org/multimedia/journals/fluid/201...

Abstract

One of the medical devices used during the open heart surgery in cardiopulmonary bypass (CPB) is the aortic curve-tip cannula. The aortic curve-tip cannula is also used in the extracorporeal membrane oxygenator (ECMO) to support patient in intensive care unit. There are few complications caused by the non – physiological jet or dispersed flow from the current cannula design. Thus, a novel designs approach to induce spiral flow and reduce the adverse effect on the aortic wall. The objective of this study is to compare the internal helical designs of curved-tip aortic cannula from three groove internal cannula design and three ribs internal cannula design against the standard cannula design; all with variation of straight and tapered body. A comparative study between six cannulae designs were carried out by computational fluid dynamics (CFD) in a steady state condition. Alls proposed internal helical designs have successfully induced spiral flow. The tapered body with 3 rib design was the best curved-tip aortic cannula design, since wall shear stress induced (2310 dyne/cm2) was below the critical value of wall shear stress (4500 dyne/cm2); while the outflow velocity was only slightly more than the standard cannula design. Also, the pressure drop across the cannula (66 mmHg) was significantly below the safe limit (100 mmHg).

Item Type:Article
Uncontrolled Keywords:spiral flow, aortic cannula design
Subjects:Q Science > QH Natural history
Divisions:Biosciences and Medical Engineering
ID Code:62883
Deposited By: Fazli Masari
Deposited On:19 Jun 2017 11:46
Last Modified:19 Jun 2017 11:46

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