Implantable pump impeller thermal knockdown
AssigneeHeartWare, Inc.
InventorsJustin Wolman, Carlos Reyes, Fernando Casas
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Abstract
The present invention relates to kits and methods for calibrating a pump through performance of a thermal knockdown process including demagnetization of an impeller of the pump where the impeller is separate from the pump. By heat treating the impeller, a property of magnetic interaction of the pump is reduced in a repeatable manner. A kit includes a pump with impeller, a controller and an oven. The method generally involves an iterative process of testing the pump for a property related to magnetic interaction of the elements of the pump, removing the impeller from the pump, heating the impeller under controlled conditions, then placing the impeller back into the pump to repeat the test performed initially.
Claims6
A kit for calibrating a pump having a stator and an impeller having a permanent magnetization and a first voltage, comprising:
- a heater sized and configured to heat treat the impeller;
- and
- a controller configured to measure back electromotive force related to a magnetic interaction between the impeller having permanent magnetization and the blood pump including the stator.
Dependencies are inferred from the claim text.