Ferrofluid-supported electromagnetic drive for a blood pump for supporting the heart or partially or totally replacing the heart

US6074365A · kind A · utility

Inventors

• Thomas Hahndel · Bitterfeld-Wolfen, DE
• Hanns-Dietrich Stahlmann · Berlin, DE
• Arnim Nethe · Berlin, DE
• Johannes Müller · Uetze, DE
• Norbert Buske · Berlin, DE
• Armin Rehfeld · Berlin, DE

Key dates

• Filing date: Jan 26, 1998
• Grant date: Jun 13, 2000
• Expiry date: Jan 26, 2018

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M60/892
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

The invention relates to a magnetofluid-supported electromagnetic drive for a blood pump for supporting or partially to totally replacing the heart whereby the blood pump in its weight as well as its energy density nearly corresponds to the natural heart and is especially suitable for an implantation whereby a reduction of the total system in comparison with known systems is to be made possible and the efficiency is improved at the same time. This task is solved by the blood pump having a magnetofluid-supported electromagnetic drive consisting of one or several electromagnets and force-transforming facilities and with the space of at least one electromagnetic circuit being completely or partially filled with magnetofluid, whereby the poles show permanent-magnetic properties. Thereby, a magnetofluid with a saturation magnetization of 150 to 450 mT has been used with an initial permeability of 5 to 25.