A study on permanent magnet topologies for hybrid bearings for medical drives applied in Ventricular Assist Devices

Open access

A study on permanent magnet topologies for hybrid bearings for medical drives applied in Ventricular Assist Devices

In industrialized countries cardiovascular diseases are the major cause of death. The last clinical therapy option for some patients, suffering from terminal heart diseases, is donor heart transplantation. As the available number of donor organs is decreasing, many patients die while waiting for a transplant. For this reason Ventricular Assist Devices (VADs), which can mechanically support the human heart to achieve a sufficient perfusion of the body, are under development. For an implantable VAD, design constraints have to be deduced from the physiological conditions in the human body. In case of a VAD drive, these constraints are for example dimensions, electric losses, which might result in an overheating of blood, and a long durability. Therefore a hybrid permanent magnet hydrodynamic bearing is designed in this paper, which works passively and contactless. Based on Finite Element simulations of magnetic fields, various permanent magnet topologies are studied in terms of axial forces and stiffness.

World-Health-Organization, Causes of Death 2008 Summary Tables http://www.who.int/evidence/bod/

Copeland J. G., Smith R., Arabia F. et al., Cardiac replacement with a total artificial heart as a bridge to transplantation. N. Engl. J. Med. 351: 859-867 (2004).

Thoratec Cooperation http://www.thoratec.com/

Miura H., Arai S., Kakubari Y. et al., Improvement of the transcutaneous energy transmission system utilizing ferrite cored coils for artificial hearts. IEEE J MAG 42(10): 3578-3580 (2006).

Hoshi H., Shinshi T., Takatani S., Third-generation blood pumps with mechanical noncontact magnetic bearings. The 13th Congress of the International Society for Rotary Blood Pumps, ISRBP, Tokyo (2011).

Pohlmann A., Lessmann M., Finocchiaro T. et al., Numerical computation can safe life: FEM simulations for the development of artificial hearts. The 14th International Conference on Electromagnetic Field Computation, CEFC, Chicago, USA, May (2010).

Samuel Earnshaw, On the nature of the molecular forces which regulate the constitution of the luminiferous ether. Transactions of the Cambridge Philosophical Society 7: 97-112 (1842).

Archives of Electrical Engineering

The Journal of Polish Academy of Sciences

Journal Information

CiteScore 2016: 0.71

SCImago Journal Rank (SJR) 2016: 0.238
Source Normalized Impact per Paper (SNIP) 2016: 0.535


All Time Past Year Past 30 Days
Abstract Views 0 0 0
Full Text Views 65 65 15
PDF Downloads 22 22 2