The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 13, 2001
Filed:
Mar. 23, 1998
H. Ming Chen, Latham, NY (US);
Mohawk Innovative Technology, Inc., Albany, NY (US);
Abstract
In order to provide a blood pump bearing having a suitable stiffness, magnetic rings for a journal bearing are provided on each of the stationary portion and the rotor and disposed in magnetically interacting facing relationship on opposite sides of a gap, and a thrust bearing is provided on the stationary portion and the rotor and disposed with magnets in magnetically interacting facing relationship on opposite sides of the same or another gap. The pump motor preferably has a bearing span which is at least about 2½ times greater than an average radius of the distributed magnetic force. In accordance with one embodiment, the stator has at least one axial extension, an axially extending gap is provided between the stator and rotor, and a journal bearing has magnets interactively disposed on opposite sides of the gap. In accordance with another embodiment, at least one pair of permanent magnets on the housing are movable relative to at least one pair of permanent magnets on the rotor which are oriented in an attractive relationship thereto in response to axial displacement of the rotor.