04927407 is referenced by 284 patents and cites 21 patents.

A centrifugal pump for left ventricle assist includes a pump housing forming an impeller chamber with inlet and outlet passages and enclosing an impeller rotatable to move blood through the impeller chamber, and a rotor chamber enclosing a rotor integral with the impeller and rotatable to drive the impeller. An elastically deformable seal member separates the rotor and impeller chambers, and includes an annular lip seal surrounding a shaft which joins the impeller and rotor. A saline solution is supplied at a constant fluid flow rate to the rotor chamber through an inlet passage, and leaves the rotor chamber by perfusing into the impeller chamber along the interface between the shaft and lip seal. The saline solution thus provides hydrodynamic bearings between the rotating shaft and rotor, and the fixed pump housing and lip seal, and further prevents blood in the impeller chamber from entering the rotor chamber. The lip seal is configured to encourage flow of saline solution along the lip seal/impeller shaft interface, while resisting the flow of blood along the interface.

Title
Cardiac assist pump with steady rate supply of fluid lubricant
Application Number
7/367960
Publication Number
4927407
Application Date
June 19, 1989
Publication Date
May 22, 1990
Inventor
Frank Dorman
Minneapolis
MN, US
Agent
Haugen and Nikolai
Assignee
Regents of the University of Minnesota
MN, US
IPC
A61F 2/22
View Original Source