Concept for a new hydrodynamic blood bearing for miniature blood pumps

Artificial Organs
Thomas Kink, Helmut Reul

Abstract

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.

References

Jan 17, 2002·The New England Journal of Medicine·E A RoseUNKNOWN Randomized Evaluation of Mechanical Assistance for the Treatment of Congestive Heart Failure (REMATCH) Study Group

❮ Previous
Next ❯

Citations

Feb 24, 2005·Artificial Organs·Paul S Malchesky
Feb 28, 2009·Artificial Organs·Martin StoiberHeinrich Schima
Jan 30, 2013·Artificial Organs·Laura J LeslieGeoff D Tansley
Sep 21, 2016·Artificial Organs·Tomotaka MurashigeOsamu Maruyama
May 23, 2008·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Jan D SchmittoFriedrich A Schöndube
Dec 3, 2005·ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs·Jingchun WuHarvey S Borovetz
Jul 10, 2019·Journal of Healthcare Engineering·Yang FuMaoying Zhou
Oct 29, 2020·Journal of Artificial Organs : the Official Journal of the Japanese Society for Artificial Organs·Daisuke SakotaOsamu Maruyama

❮ Previous
Next ❯

Related Concepts

Related Feeds

Artificial Heart & Ventricular Assist Devices

Total artificial hearts (TAH) and ventricular assist devices (VADs) provide cardiac support for patients with end-stage heart disease and have significantly improved the survival of these patients. Discover the latest research on Artificial Heart and Ventricular Assist Devices here.

Related Papers

ASAIO Journal : a Peer-reviewed Journal of the American Society for Artificial Internal Organs
Toru MasuzawaYohji Okada
The Journal of Heart and Lung Transplantation : the Official Publication of the International Society for Heart Transplantation
Georg M WieselthalerHVAD Clinical Investigators
© 2021 Meta ULC. All rights reserved