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Design considerations for bearingless rotary pumps

R T Kung¹, R M Hart

¹Abiomed Inc., Danvers, Massachusetts 01923, USA.

Artificial Organs

|July 1, 1997

Summary

Bearingless rotary blood pumps eliminate thromboembolism risk. This study evaluated combined magnetic and hydraulic forces for feasible bearingless pump designs, balancing shear rates and leak rates.

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Area of Science:

Biomedical Engineering
Medical Devices
Cardiovascular Technology

Background:

Rotary blood pumps have advanced, particularly contact bearing designs.
Thromboembolism remains a significant risk with current designs.
Bearingless pumps are necessary to eliminate thromboembolism.

Purpose of the Study:

To evaluate bearingless pump designs for axial and centrifugal configurations.
To explore the use of magnetic, hydrodynamic, and hydrostatic forces for suspension.
To determine the feasibility of combined magnetic and hydraulic stabilizing forces.

Main Methods:

Assessed bearingless designs for axial and centrifugal pumps.
Analyzed trade-offs between shear rates and bearing leak rates.
Considered constraints of hemolysis and residence time.

Main Results:

Identified design feasibility for rotary pumps using combined forces.
Demonstrated the potential for simplified device configuration and control.
Evaluated the interplay between hydraulic and magnetic forces.

Conclusions:

Bearingless rotary blood pump designs are feasible.
Combined magnetic and hydraulic forces offer a promising approach.
This technology can mitigate thromboembolism risks in blood pumps.

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