Purge-free miniature rotary pump
AssigneeABIOMED, Inc.
InventorThorsten Siess
Life of this patent
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Abstract
Methods and systems are provided for the circulation of blood using a purge-free miniature pump. In one embodiment, a pump is provided that may comprise a housing including a rotor and a stator within a drive unit. In this embodiment, the pump may establish a primary blood flow through the space between the drive unit and the housing and a secondary blood flow between the rotor and stator. In another embodiment, a pump establishes a primary blood flow outside the housing and a secondary blood flow between the rotor and stator. In yet another embodiment, a method is provided for introducing the pump into the body and circulating blood using the pump.
Claims10
A method for providing cardiac assistance comprising the steps of:
- providing a blood pump including an elongated housing, a drive unit positioned within the housing and having a rotor comprising a rotor motor magnet and a stator comprising a stator motor magnet, wherein the rotor and stator form an electromagnetic motor in the drive unit, an impeller positioned at one end of the drive unit and connected to the rotor, and a cannula extending from an end of the housing nearest the impeller, wherein the rotor motor magnet and the stator motor magnet cooperate to cause the rotor to rotate and thereby rotate the impeller;
- and
- operating the blood pump to create a primary blood flow in an annular space formed between an interior wall of the elongated housing and an exterior of the drive unit and a secondary blood flow in an annular space formed between the rotor motor magnet and the stator motor magnet,
- wherein the secondary blood flow is generally in a direction opposite the primary blood flow.
Dependencies are inferred from the claim text.