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Concept for a New Hydrodynamic Blood Bearing for Miniature Blood Pumps
Author(s) -
Kink Thomas,
Reul Helmut
Publication year - 2004
Publication title -
artificial organs
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.684
H-Index - 76
eISSN - 1525-1594
pISSN - 0160-564X
DOI - 10.1111/j.1525-1594.2004.07387.x
Subject(s) - bearing (navigation) , mechanical engineering , fluid bearing , magnetic bearing , rotor (electric) , groove (engineering) , engineering , power consumption , mechanics , power (physics) , materials science , structural engineering , computer science , lubrication , physics , quantum mechanics , artificial intelligence
The most crucial element of a long‐term implantable rotary blood pump is the rotor bearing. Because of heat generation and power loss resulting from friction, seals within the devices have to be avoided. Actively controlled magnetic bearings, although maintenance‐free, increase the degree of complexity. Hydrodynamic bearings for magnetically coupled rotors may offer an alternative solution to this problem. Additionally, for miniature pumps, the load capacity of hydrodynamic bearings scales slower than that of, for example, magnetic bearings because of the cube‐square‐law. A special kind of hydrodynamic bearing is a spiral groove bearing (SGB), which features an excellent load capacity. Mock‐loop tests showed that SGBs do not influence the hydraulic performance of the tested pumps. Although, as of now, the power consumption of the SBG is higher than for a mechanical pivot bearing, it is absolutely contact‐free and has an unlimited lifetime. The liftoff of the rotor occurs already at 10% of design speed. Further tests and flow visualization studies on scaled‐up models must demonstrate its overall blood compatibility.