The Sealless and Bearingless Rotor Blood Pump System: Adaptation to the Circulatory System and In Vitro Advantages in Efficiency, Flow Characteristics, and Boundary Conditions of Thermal Heat Up

  • G. Bramm
  • D. B. Olsen


The long-term application of blood pump systems on the basis of conventional displacement concepts involves many insufficiencies due to unavoidable characteristics of the mechanical function which provoke inevitable material wear and embrittlement. The consequent desire to avoid all sorts of material loading has led to the new concept of the free-floating, magnetically suspended rotor blood pump [1–3]. This concept has found application in some laboratory models of blood pump, and in vitro results with these pumps have been published [4, 5]. In the following, we discuss the characteristics of these types of pump operating on a circulatory system and the advantages displayed in vitro.


Peripheral Resistance Blood Pump Venous Compliance Pump Type Venous Volume 
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  1. 1.
    Bramm G, Novak P, Olsen DB (1981) A free-floating body as the rotor of a centrifugal blood pump for LVAD or TAH. Eur Soc Artif Organs Proc (Copenh) 8:41–45Google Scholar
  2. 2.
    Bramm G, Novak P, Olsen DB, Ruge I (1982) Axial centrifugal blood pump with magnetically suspended rotor life support systems. Proceedings, IX annual meeting of the ESAO, 1982. p 215–219Google Scholar
  3. 3.
    Bramm G, Novak P, Olsen DB, Ruge I (1982) A radial centrifugal blood pump with magnetically suspended rotor. 2nd int workshop. J Artif Organs 5(3): 161–163Google Scholar
  4. 4.
    Bramm G, Olsen DB, Novak P, Ruge I (1982) Seal- and bearingless blood pump conception for long term application to avoid coagulation and to reduce hemolysis. Proceedings, World congress on medical physics and biomedical engineering, pp 5, 25Google Scholar
  5. 5.
    Bramm G, Olsen DB, Novak P, Ruge I (1983) Ventil- und lagerfreie Blutpumpen zur Reduzierung von Blutschäden im Langzeiteinsatz. 17th Annual meeting at the German society of biomedical technology, Suppl 28:3Google Scholar
  6. 6.
    Bramm G, Olsen DB (1984) Reduction of coagulation and hemolysis by sealless and bearingless blood pump systems for long-term application. In: Unger F (ed) Assisted circulation 2. Springer, Berlin Heidelberg New York TokyoGoogle Scholar
  7. 7.
    Gillis MF, Walkup PC (1969) Studies on the effect of added andogenous heat and on heat exchanger designs. Report, Battelle memorial institute, Pacific Northwest Lab, Richland, WashGoogle Scholar
  8. 8.
    Pegg C, Sandberg G, Lee R, Huffman P, Normann J (1969) Effects of intracorporeal Sr 90-Am 241/Be sources (RES) simulating radiation fields from Pu-238-fueled artificial heart (Abstract). Fed Proc 28(2):789Google Scholar
  9. 9.
    Norman JC, Harvex RJ, Covelli VH, McCandlers W, Bernhard WF (1967) Implantable power sources: continuing studies. Proceedings of 20th Annual Conference on Engineering in Medicine and Biology, Boston, vol 9, no 3/4Google Scholar
  10. 10.
    Natl Heart Lung and Blood Inst (1980) Performance definitions for energy systems. Report, contractors meeting of the device and technology branch. National Heart Lung and Blood Institute, BethesdaGoogle Scholar
  11. 11.
    Bramm G, Ruge I (1981) New control and system - conception of a heart-lung-machine. Proceedings IIIrd meeting of the ISAO, Paris 1981, suppl vol 5, pp 372–375Google Scholar
  12. 12.
    Bramm G, Koschke P, Gaab M (1982) Cavity resonator sensing system. In: Proceedings World Congress on Medical Engineering. MPBE, HamburgGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1989

Authors and Affiliations

  • G. Bramm
  • D. B. Olsen

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