发明名称 |
Backflow detection for centrifugal blood pump |
摘要 |
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. |
申请公布号 |
US8834345(B2) |
申请公布日期 |
2014.09.16 |
申请号 |
US201313742478 |
申请日期 |
2013.01.16 |
申请人 |
Thoratec Corporation |
发明人 |
Yanai Masamichi;Zhang Tao;Houdek Jeffrey G. |
分类号 |
A61M1/10 |
主分类号 |
A61M1/10 |
代理机构 |
Kilpatrick Townsend & Stockton LLP |
代理人 |
Kilpatrick Townsend & Stockton LLP |
主权项 |
1. A centrifugal pump system comprising:
a disc-shaped impeller having an outer circumference and adapted to be rotatably driven in a pumping direction; a housing with a pumping chamber receiving the impeller, the pumping chamber defining 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 for receiving a voltage and for driving the impeller in response to the voltage provided to the motor; a current sensor for measuring a current flow within the motor in response to the voltage; and a controller having a predetermined relation between the measured current and the pump flow rate, wherein the controller estimates the pump flow rate in response to said predetermined relation wherein the predetermined relation includes a positive slope from a predetermined backflow rate to a zero pump flow rate. |
地址 |
Pleasanton CA US |