Purge-free miniature rotary pump
AssigneeABIOMED, Inc.
InventorThorsten Siess
Life of this patent
Estimating the term…
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.
Claims16
A paracardial blood pump, comprising:
- a distal end configured as a blood flow inlet;
- a proximal end configured as a blood flow outlet;
- a tubular housing with a longitudinal axis,
- a drive unit arranged coaxially within the tubular housing, the drive unit comprising a rotor motor magnet and a stator motor magnet, the rotor motor magnet and the stator motor magnet configured to drive a rotation of an impeller positioned at one end of the drive unit;
- a longitudinally extending primary flow channel positioned between an interior wall of the housing and an exterior of the drive unit;
- a pump ring with an axial inlet positioned at one end of the tubular housing and surrounding at least a portion of the impeller, wherein the drive unit drives a rotation of the impeller within the pump ring;
- a cannula extending from an end of the tubular housing nearest the impeller;
- a laterally branching outlet tube positioned proximate an end of the tubular housing opposite the impeller, the laterally branching outlet tube positioned perpendicularly to the primary flow channel;
- a secondary flow channel formed between the rotor motor magnet and the stator motor magnet, the secondary flow channel configured to direct a flow of blood in a direction generally opposite a direction of blood flow through the primary flow channel wherein the primary flow channel and the secondary flow channel are in fluid communication with each other
- such that blood flows from the primary flow channel to the secondary flow channel in a direction perpendicular to the longitudinal axis and positioned proximally of the laterally branching outlet tube.
A paracardial blood pump, comprising:
- a distal end configured as a blood flow inlet;
- a proximal end configured as a blood flow outlet;
- a drive unit arranged coaxially within a tubular housing, the drive unit comprising a rotor motor magnet and a stator motor magnet, the rotor motor magnet and the stator motor magnet configured to drive a rotation of an impeller positioned at one end of the drive unit;
- a longitudinally extending primary flow channel between an exterior of the drive unit and an interior wall of the tubular housing, and a secondary flow channel is formed between the rotor motor magnet and the stator motor magnet, the secondary flow channel configured to direct a flow of blood between the rotor and the stator in a direction generally opposite a direction of blood flow through the primary flow channel;
- a cannula extending from an end of the tubular housing nearest the impeller, the impeller configured to convey blood through the cannula to the primary flow channel;
- a laterally branching outlet tube positioned proximate an end of the tubular housing opposite the impeller, the laterally branching outlet tube positioned perpendicularly to the primary flow channel;
- and
- wherein the secondary flow channel and the primary flow channel are in fluid communication such that blood flows from the secondary flow channel to the primary flow channel the blood flowing perpendicularly to a longitudinal axis of the tubular housing and proximally of the laterally branching outlet tube.
Dependencies are inferred from the claim text.