Flow estimation using hall-effect sensors for measuring impeller eccentricity
US9901666B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 19, 2016 |
| Grant date | Feb 27, 2018 |
| Priority date | — |
| Expiry date | Aug 12, 2036 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61M2205/8212
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Methods and apparatus for estimating flow rate in a blood circulation assist system employing impeller eccentricity. A method includes magnetically rotating an impeller within a blood flow channel of a blood pump. The impeller is levitated within the blood flow channel transverse to the impeller axis of rotation. A rotational speed for the impeller is determined. At least one impeller transverse position parameter is determined. The at least one impeller transverse position parameter is based on at least one of (1) an amount of a bearing current that is used to levitate the impeller transverse to the impeller axis of rotation, and (2) a position of the impeller within the blood flow channel transverse to the impeller axis of rotation. A flow rate of blood pumped by the blood pump is estimated based on the impeller rotational speed and the at least one impeller transverse position parameter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.