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To investigate the suspension performance of passive magnetic bearings and measure the minimal speed for suspension, a permanent maglev turbine was designed. A measuring device for rotor eccentricity was assembled and the calculation model of the eccentricity was established. The device used four Hall sensors evenly fixed on the turbine stator to detect rotor's position, and the rotor's rotating speed...
Three passive magnetic bearings developed by the authors have been applied to the impeller blood pumps. The measuring system with hall sensors is built for determination of the maximal rotor eccentric distances in the pumps. The results show that when the rotating speed exceeds 4000rpm and the mass flow rate exceed 4 L/min, magnetic levitations can be achieved in the rotor with I-type bearing because...
The invasive model of power supply for the commercial blood pumps has brought great discomfort to the patients. An inductive power transmission system based on transformer for blood pumps has been designed and developed. The system is mainly consist of power supply, control circuit of switch, transformer, rectifier circuit and energy storage element. Experiments on power transmission in the system...
The long-term clinical use of blood pumps is dependent on the bio-compatibility. Blood trauma especially hemolysis is closely related to the flow fields in the pumps according to the homodynamic. Computational fluid dynamics technique has been used to visualize the flow patterns and distribution of shear stress in two pumps with different impeller designs and to evaluate the hemolysis level. After...
The comfortability of the receptor with a left ventricular assist pump becomes more and more important along with the daily prolonged survival. Thereby it is necessary to achieve automatic measurement and bionic control for heart pump. The key-point is to improve the sensitivity of flow rate change after the pressure head variation in the pump, so as to maintain the flow rate balance between the left...
In order to avoid mechanical wear in artificial heart pumps for long-term application, the author developed 2 prototypes of permanent maglev left ventricular assist devices(LVAD): axially driven centrifugal pump, and radially driven centrifugal pump, in which a passive magnetic(PM) bearing in common use(Bearing A) and a novel PM bearing developed by the author(Bearing B) were used respectively. The...
An implantable aortic valve-pump was designed. There were a central rotor and a stator in the device. The rotor was consisted of driven magnets and an impeller, the stator was consisted of a motor coil with an iron core, an inducer and a diffuser. This pump has promisingly better antithrombogenicity than other heart pumps, for neither connecting conduits nor “bypass” circuits are necessary, which...
Particle image velocimetry with out-trigger synchronization system developed by the authors was applied to investigate the flow patterns and hemo-compatibility in the blood pumps. The results showed that: the particle image velocimetry with outer trigger realized the continuous sample of velocity in one flow path in the pumps; both the absolute velocity and relative velocity varied with impeller design,...
To develop ambulatory total respiratory and right heart assistance for up to 4 weeks as a bridge to lung transplantation, we coupled a compact gas exchange device with a right ventricular assist device (RVAD), a compact rotary blood pump, to create an “OxyRVAD.”Our ambulatory OxyRVAD includes a portable (4 × 4 × 7-cm) centrifugal pump with heparin saline-purged needle roller bearings and an ultra-low-resistant...
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