Abstract:
:Spiral/helical forms of blood flow have been observed in large arteries of the cardiovascular system, but their benefits remain underappreciated. Spiral flow has been postulated to improve near-wall washout, promoting anti-atherothrombotic conditions. This research aims to study the washout characteristics of spiral flow, specifically, its ability to increase velocity and wall shear stress (WSS) in atherothrombotic-prone regions. Using 1.2 cm diameter angled test-conduits (45°, 90°, 135°) with known recirculation/stasis regions at the bend corners, spiral flow washout potential was evaluated in terms of low velocity and low WSS. Two sub-studies were conducted: the first utilized a spiral flow-inducing device to enable qualitative analysis of washout-potential in both computational fluid dynamic (CFD) simulations and benchtop ultrasound visualization; the second used CFD to study the impact of several induced helical wavelengths on the conduit-dependent recirculation/stasis zones. Physical models of the angled conduits and spiral flow-inducer were 3D-printed to facilitate ultrasound visualization. Compared to straight flow, spiral flow generated by the flow-inducer significantly cleared the recirculation/stasis zones at the corners of the angled conduits. CFD simulations demonstrated that past a geometry-dependent threshold, increased helical content improved washout, denoted by decreased regions of low velocity and low WSS. Overall, spiral flow markedly improved washout in difficult to reach areas in the angled conduits. This has several important clinical implications: spiral flow shows great promise in reducing blood-transport-related complications and can be used to enhance the performance of future medical devices (eg grafts, mechanical circulatory support devices, hemodialysis access ports).
journal_name
Artif Organsjournal_title
Artificial organsauthors
Huang Zhang P,Tkatch C,Newman R,Grimme W,Vainchtein D,Kresh JYdoi
10.1111/aor.13520subject
Has Abstractpub_date
2019-12-01 00:00:00pages
1144-1153issue
12eissn
0160-564Xissn
1525-1594journal_volume
43pub_type
杂志文章abstract::Only a small number of English hospitals provide postcardiotomy venoarterial extracorporeal membrane oxygenation (VA-ECMO) and there are doubts about its efficacy and safety. The aim of this service evaluation was to determine local survival rates and report on patient demographics. This was a retrospective service ev...
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journal_title:Artificial organs
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journal_title:Artificial organs
pub_type: 杂志文章,评审
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journal_title:Artificial organs
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journal_title:Artificial organs
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更新日期:1996-12-01 00:00:00
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pub_type: 杂志文章
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更新日期:1986-06-01 00:00:00
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journal_title:Artificial organs
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