Abstract:
:Roller pumps have been widely used in the ventricular assist field for many years, while the significant hemolysis caused by its mechanical stress is still a fundamental problem. Although the usual under-occlusion setting was considered as an effective method to reduce the hemolysis rate, its nonocclusive condition of the whole process may cause serious backflow results, which exactly places many restrictions on this method. In this study, the simulation experiments based on computational fluid dynamics (CFD) is conducted, and the occlusion angle is proposed and used to explore a more reliable adjustment form of the occlusion condition. The parameterized geometry of a roller pump is established based on the occlusion angle and other parameters. In order to simulate the motion of the roller, the dynamic mesh mode is introduced to the CFD model, and the analytic formulations used to determine the boundary position are derived. In the whole operation process of the roller pump, four feature positions of the rollers were focused and extracted, and the flow characteristics and the shear stress distribution at these positions were demonstrated. It was found that the entry and exit of the rollers could cause clear shear stress peak, especially when one roller entered, the peak got extremely high. Furthermore, the roller pumps with different occlusion angles were compared, and the results showed that decreasing the occlusion angle could lead to a notable decrease in the amplitude and range of high shear stress and the hemolysis index with a small loss of the occlusion duration. It can be concluded that appropriately decreasing the occlusion angle may be an effective method to alleviate the hemolysis which should be given more attention.
journal_name
Artif Organsjournal_title
Artificial organsauthors
Zhou Y,Sun B,Chen M,Cui Cdoi
10.1111/aor.13790subject
Has Abstractpub_date
2020-07-31 00:00:00eissn
0160-564Xissn
1525-1594pub_type
杂志文章abstract::The energy dissipated in blood or on a total artificial heart (TAH) chamber's elements directly or indirectly decreases the biological or technical safety of the TAH's work. The energetic analysis of the Polish total artificial heart (POLTAH) external work with the objective of estimating the valve and membrane roles ...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1046/j.1525-1594.1998.05074.x
更新日期:1998-10-01 00:00:00
abstract::The purpose was to evaluate the cytotoxicity of two novel formulations (alpha and beta) of calcium phosphate cements. Positive control, represented by a commercial hydroxyapatite cement, and negative control were included for comparative purposes. A continuous lineage of fibroblastic cells was used, and the effect of ...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2005.29022.x
更新日期:2005-02-01 00:00:00
abstract::Microcapsules containing insulin crystals or islets of Langerhans were made by extruding a mixture of insulin crystals or islets and sodium alginate into a calcium chloride solution, and then coating it with poly-l-lysine. When these microcapsules were incubated at 37 degrees C, insulin could be detected readily in th...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1983.tb04187.x
更新日期:1983-05-01 00:00:00
abstract::Heparin remains the predominant anticoagulant during extracorporeal membrane oxygenation (ECMO). Heparin acts by potentiating the anticoagulant effect of antithrombin (ATIII). Acquired ATIII deficiency, common in pediatric patients requiring ECMO, may result in ineffective anticoagulation with heparin. ATIII replaceme...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2011.01384.x
更新日期:2011-11-01 00:00:00
abstract::We aimed to evaluate the timing of preoperative intra-aortic balloon pump (IABP) placement and outcomes in patients undergoing off-pump coronary artery bypass grafting (OPCAB). Patients with prophylactic IABP placement before OPCAB presenting between January 1, 2010 and December 31, 2013 were included. Patients were c...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/aor.13009
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abstract::Biofilms are communities of bacteria that can cause infections which are resistant to the immune system and antimicrobial treatments, posing a significant threat for patients with implantable and indwelling medical devices. The purpose of our research was to determine if utilizing specific parameters for electric curr...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/aor.12678
更新日期:2016-08-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/aor.12390
更新日期:2015-04-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1978.tb01002.x
更新日期:1978-02-01 00:00:00
abstract::To study the microvessels in bulbar conjunctiva, we conducted an experiment in goat with a pneumatically driven left heart bypass pump, which was replaced with an undulation pump-left ventricle assist device for 9 days. Three flow patterns were tested: complete pulsatile, continuous, and percentage of pulsatile. We st...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2006.00244.x
更新日期:2006-06-01 00:00:00
abstract::The use of Berlin Heart EXCOR VAD (BH) is a validated therapy to bridge pediatric patients to heart transplant. Serial echocardiographic (ECHO) assessment of VAD patients is necessary to support patients' management. This work aims at developing an innovative strategy to evaluate the BH device functioning by ECHO and ...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/aor.13122
更新日期:2018-04-01 00:00:00
abstract::Medial opening-wedge has gained popularity in comparison to other techniques of high tibial osteotomy. This technique involves the creation of a gap in the tibia. Filling the gap with autologous iliac bone graft was recommended in the classic description, to prevent complications such as correction loss or delayed bon...
journal_title:Artificial organs
pub_type: 杂志文章,随机对照试验
doi:10.1111/j.1525-1594.2010.01058.x
更新日期:2011-03-01 00:00:00
abstract::Monoclonal antibodies for targeting cytotoxic conjugates to tumor cells are currently being evaluated together with extracorporeal affinity adsorption. The aim of the adsorption was to reduce undesired side effects in normal organs and to increase the tumor-to-normal tissue ratios. This technique is also applicable to...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2007.00380.x
更新日期:2007-04-01 00:00:00
abstract::This study explores a quantitative evaluation of blood damage that occurs in a continuous flow left ventricular assist device due to fluid stress. Computational fluid dynamics (CFD) analysis is used to track the shear stress history of 388 particle streaklines. The accumulation of shear and exposure time is integrated...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1046/j.1525-1594.2003.00026.x
更新日期:2003-10-01 00:00:00
abstract::Although current continuous-flow total artificial hearts (CFTAHs) are much smaller than previous models, venous kinking may still occur after device implantation, especially in smaller animals. By inserting a self-expanding stent at the site of venous narrowing in a sheep model implanted with a CFTAH, we were able to ...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2011.01233.x
更新日期:2011-07-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1995.tb02318.x
更新日期:1995-03-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2009.00917.x
更新日期:2010-06-01 00:00:00
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journal_title:Artificial organs
pub_type: 临床试验,杂志文章
doi:10.1111/j.1525-1594.1995.tb02291.x
更新日期:1995-12-01 00:00:00
abstract::Effect of hemodialysis (HD) on some indices of immune response was studied in nine chronic uremics. Total lymphocyte, OKT4+, and OKT8+ cell numbers significantly decreased during the first 20 min of HD, and they were decreased till the third hour of the procedure, whereas the OKT4+/OKT8+ cell number ratio did not chan...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1989.tb02861.x
更新日期:1989-06-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2008.00561.x
更新日期:2008-05-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1984.tb04298.x
更新日期:1984-08-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1987.tb02645.x
更新日期:1987-04-01 00:00:00
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journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2009.00951.x
更新日期:2009-11-01 00:00:00
abstract::The cochlea is an end organ, which is metabolically dependent on a nutrient and oxygen supply to maintain its normal physiological function. Cochlear ischemia and reperfusion (IR) injury is considered one of the most important causes of human idiopathic sudden sensorineural hearing loss. The aim of the present study w...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/aor.12863
更新日期:2017-08-01 00:00:00
abstract::In vitro cardiovascular device performance evaluation in a mock circulation loop (MCL) is a necessary step prior to in vivo testing. A MCL that accurately represents the physiology of the cardiovascular system accelerates the assessment of the device's ability to treat pathological conditions. To serve this purpose, a...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2010.01088.x
更新日期:2011-04-01 00:00:00
abstract::Tissue engineering utilizes an interdisciplinary approach to generate constructs for the treatment and repair of diseased organs. Generation of small vessels as vascular grafts or as envisioned central vessel for vascularized constructs is still a challenge. Here, the decellularization of porcine vessels by a non-dete...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/aor.13836
更新日期:2020-10-01 00:00:00
abstract::Recently, the use of electrolyzed solutions has attracted considerable interest in Japan. This study investigates the efficiency of electrolyzed solutions as disinfecting agents (DA) in the reuse of dialyzers and compares their efficiency to that of other disinfectants currently in use. The following 3 methods were em...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1046/j.1525-1594.2000.06611.x
更新日期:2000-12-01 00:00:00
abstract::The major restrictions to the transport of solute and solvent across the peritoneum are the limited peritoneal blood flow, area and permeability. Recent investigations have demonstrated that several vasoactive drugs influence transport parameters. Isoproterenol, nitroprusside, dipyridamole and dopamine exemplify drugs...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.1979.tb01052.x
更新日期:1979-08-01 00:00:00
abstract::The effectiveness of the blood substitute neo red cells (NRC) on hemorrhagic shock was evaluated in dogs. Shock was induced by bloodletting, and NRC was infused immediately until the dogs recovered from shock; the process was repeated 3 times (mild shock), or NRC was infused after shock was maintained for 30 min, and ...
journal_title:Artificial organs
pub_type: 杂志文章
doi:
更新日期:1998-02-01 00:00:00
abstract::Twelve patients, 8 male and 4 female, aged from 26 to 70 years were studied. They were on hemodialysis (HD) 4 h three times weekly with cuprophan hollow fiber dialyzers (Gambro 120M) and dialysate containing 35 mEq/L of acetate. The study compares two random HD sessions on each patient. Sixty minutes prior to one rand...
journal_title:Artificial organs
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1111/j.1525-1594.1989.tb01551.x
更新日期:1989-10-01 00:00:00
abstract::The nanocomposites (denoted "CII-Au") of porcine type II collagen (CII) with 0.05, 0.1, 0.5, 1, or 2.5% (wt/wt) Au nanoparticles ( approximately 5 nm) were fabricated for potential use in cartilage tissue engineering. Au formed clusters on the surface of all nanocomposites and appeared to distribute along the collagen...
journal_title:Artificial organs
pub_type: 杂志文章
doi:10.1111/j.1525-1594.2007.00482.x
更新日期:2007-12-01 00:00:00