Study on regurgitation of a bearing-less mini axial aortic valvo-pump with closed impeller

Abstract

The back-flow of an aortic valvo-pump will re-duce the pumping flow rate but can wash out the gap between the rotor and the stator, and thus can improve the antithrombogenicity of the de-vice. To investigate the regurgitation of a 23mm OD aortic valvo-pump, its closed impeller was replaced by a cylinder and hereby the valvo- pump had lost its pumping function. The pres-sure head crossing the aortic valvo-pump was maintained by a locally made pulsatile centrifugal pump, beating rhythmically from 30 to 120mmHg. The back flow from outlet to inlet of valvo-pump via the above-mentioned gap was measured. Results demonstrated that this gap and the pressure head had remarkable effect on back- flow; a larger gap and/or a larger pressure head would lead to a larger back-flow. By 0,20mm gap and 100mmHg pressure head, the valvo-pump had ca. 0,8 l/min back-flow. Instantaneous meas-urement indicated that the back-flow had a pul-satile form with high rate during diastole while low rate during systole of the natural heart imi-tated by pulsatile centrifugal pump. The pump rotated at 12500rpm, 15000rpm and 17500rpm respectively, but it was found the rotating speed had no affection on back-flow. This investigation provides a basis for pump design seeking for both increase of the flow rate and improvement of the compatibility; the former is particularly important for a mini axial pump and the latter is extremely difficult for closed impeller

Investigation of Volatile Compounds, Microbial Succession, and Their Relation During Spontaneous Fermentation of Petit Manseng

“…Odor threshold and odors were obtained from literatures: [A](Tao and Li, 2009); [B](Peng et al, 2013); [C](Ferreira et al, 2000); [D](Noguerol et al, 2009); [E](Zea et al, 2001); [F](Zhang et al, 2010); [G](Niu et al, 2011); [H](Mayr et al, 2014); [I](Peinado et al, 2006); [J](Gómez et al, 2007); [K]; [L](López et al, 2004); [M](Culleré et al, 2004); [N](Zhao C. et al, 2020); [P](Mihail et al, 2019); [O](Guth, 1997); [P](Du et al, 2011); [Q] …”