Purpose: Demonstrate the advantages and challenges to improve the design and construction of a small heart assist device “LifeheART” that can be installed in the ascending aorta or the main pulmonary arteries. Different pump rotor designs and ways of implementations in the aorta, magnetic bearing and design issues are investigated.Method: a Small shaftless axial pump with suspended rotor using magnetic bearing was examined to achieve better performance with lower blood damage. Three different CAD designs of pump impeller were investigated together with their assembly process. Pump performance and shear stress were estimated using commercial CFD package. The Lagrangian approach was employed to evaluate the resident time and accordingly the hemoysis index which considered as indication of blood damage was calculated. Three ways of implementing the heart assist device in the ascending aorta or the main pulmonary arteries were proposed and demonstrated highlighting the merits of each method. The electromagnetic field was simulated using a commercial software to match the required hydraulic power. A mock circulatory loop was used to investigate the pump performance and blood damage was tested. Results: The spatial distribution of pressure and velocity along the pump are presented for different types of impeller. A full shrouded suspended rotor was found to be hydro-dynamically efficient if it can be fully sealed from the surrounding stator. However, a partially shrouded impeller is believed to be technically viable. A brushless, asynchronous and 3-phase AC electric motor was designed in size and shape so that it can be installed into the anatomically main pulmonary artery and/or aortic root. Conclusions: Different impellers have been examined using CFD analysis. The advantages and challenges in using each impeller has been discussed. Moreover the methods of implementing the heart assist device, control system and power supply system are demonstrated.
|Publication status||Published - 27 Sep 2015|
|Event|| Annual Meeting of the International Society for Rotary Blood Pumps - Dubrovnik, Croatia|
Duration: 27 Sep 2015 → 29 Sep 2015
Conference number: 23
|Conference||Annual Meeting of the International Society for Rotary Blood Pumps|
|Period||27/09/15 → 29/09/15|