Centrifugal blood pump with hydrodynamic bearing

US11092158B2 · kind B2 · utility

Assignee

• Abiomed Europe GmbH · DE

Inventors

• Thorsten Siess · Aachen, DE
• Gerd Spanier · Aachen, DE

Key dates

• Filing date: Oct 11, 2013
• Grant date: Aug 17, 2021
• Expiry date: Dec 31, 2035

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61M60/422
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A centrifugal blood pump without a mechanical bearing comprises a pump casing (1), an impeller (9) arranged in the pump casing rotatably about the central axis and freely movable axially and radially within a limited clearance. The impeller has permanent magnets or permanently magnetized magnetic regions (N/S) which cooperate with an electromagnetic drive to set the impeller rotating. A circular wall (12) or circularly arranged wall sections are provided within the pump casing, their inner surfaces defining a radial clearance together with the outer circumference of the impeller to form a hydrodynamic radial bearing for the impeller.