Invention Grant
- Patent Title: Backflow detection for centrifugal blood pump
- Patent Title (中): 离心式血泵回流检测
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Application No.: US13742478Application Date: 2013-01-16
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Publication No.: US08834345B2Publication Date: 2014-09-16
- Inventor: Masamichi Yanai , Tao Zhang , Jeffrey G. Houdek
- Applicant: Thoratec Corporation
- Applicant Address: US CA Pleasanton
- Assignee: Thoratec Corporation
- Current Assignee: Thoratec Corporation
- Current Assignee Address: US CA Pleasanton
- Agency: Kilpatrick Townsend & Stockton LLP
- Main IPC: A61M1/10
- IPC: A61M1/10

Abstract:
A centrifugal pump system for a cardiac assist device employs a disc-shaped impeller having an outer circumference adapted to be rotatably driven in a pumping direction. A pump housing has a pumping chamber receiving the impeller, wherein the pumping chamber defines an outlet volute having a separation edge spaced from the outer circumference to provide a limited backflow path coinciding with the pumping direction. A motor drives the impeller in response to a voltage provided to the motor. A current sensor measures current flow within the motor in response to the voltage. A controller estimates a pump flow rate in response to a predetermined relation between the measured current and the pump flow rate, wherein the predetermined relation includes a positive slope from a predetermined backflow rate to a zero pump flow rate.
Public/Granted literature
- US20140200390A1 BACKFLOW DETECTION FOR CENTRIFUGAL BLOOD PUMP Public/Granted day:2014-07-17
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