Patent · US Expired

Blood pump as centrifugal pump

US5746575A · kind A · utility

140Cited by

6References

12Claims

0Family size

Assignee

Baxter International Inc. · US

Inventors

Dieter Westphal · Herrsching am Ammersee, DE
Helmut Reul · St. Blasien, DE
Guenter Rau · Aachen, DE

Key dates

Filing date	Dec 22, 1995
Grant date	May 5, 1998
Priority date	—
Expiry date	Dec 22, 2015

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S415/90
WIPO fieldMedical technology
WIPO sectorInstruments

Abstract

In a pump housing (10), the blood pump comprises an impeller (13) with a flat plate (30) and blades (34) projecting therefrom. The impeller (13) is supported between balls (18,20) forming an axial sliding bearing. The front wall (35) and the back wall (14) of the pump housing extend substantially parallel to the plate (30) of the impeller (13). The height of the blades (34) linearly decreases with increasing radius so that the gap between the front wall (35) and the blades (34) increases outwards. Since the circumferential speed increases as well, the shearing rate remains constant. Between the plate (30) of the impeller and the back wall (14), a gap of constant width is provided, in which secondary flows are produced, thereby avoiding dead water zones.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.