Integrated blood oxygenator and pump system having active blood oxygenator
AssigneeCardiovention, Inc.
InventorsThomas A. Afzal, Ronald G. Williams
Life of this patent
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Abstract
An integrated blood oxygenation and pump system suitable for use in a sterile field having a low priming volume is provided in which a blood oxygenator portion of the system includes an active element, separate from the pump, that disrupts the development of laminar flow and stagnation zones in the fiber bundle employed for gas exchange. The integrated system enables the pump and oxygenator to be used independently of one another or be rapidly reconfigured to provide both pumping action and blood oxygenation.
Claims15
A system for processing blood during a surgical procedure comprising:
- an extracorporeal housing having a system inlet and a system outlet;
- a blood pump disposed within the extracorporeal housing and comprising a plurality of vanes affixed to a first shaft;
- a first variable-speed motor coupled to the first shaft to drive the first shaft at a first rotational speed;
- an oxygenator disposed within the extracorporeal housing and coupled to the blood pump, the oxygenator comprising a multiplicity of hollow fibers affixed to a second shaft, the second shaft having a gas inlet lumen and a gas outlet lumen, each one of the multiplicity of fibers having a first end coupled to a gas inlet manifold communicating with the gas inlet lumen and a second end coupled to a gas outlet manifold communicating with the gas outlet lumen, rotation of the second shaft generating a pressure head;
- and
- a second variable-speed motor coupled to the second shaft to drive the second shaft at a second rotational speed;
- and
- a controller coupled to the first and second variable-speed motors, the controller programmed to vary the second rotational speed responsive to changes in the first rotational speed to provide a user-selected blood flow rate at the system outlet.
Apparatus for extracorporeally processing blood during a surgical procedure comprising:
- a housing having a system inlet and a system outlet;
- a blood pump disposed within the housing and comprising a plurality of vanes affixed to a first shaft;
- a first variable-speed motor coupled to the first shaft to drive the first shaft at a first rotational speed;
- an oxygenator disposed within the housing and coupled to the blood pump, the oxygenator comprising a multiplicity of hollow fibers affixed to a second shaft, each one of the multiplicity of hollow fibers having a first end potted in a gas inlet manifold and a second end potted in a gas outlet manifold;
- a second variable-speed motor coupled to the second shaft to drive the second shaft at a second rotational speed;
- and
- a controller coupled to the first and second variable-speed motors, the controller programmed to vary the second rotational speed responsive to changes in t he first rotational speed to provide a user-selected blood flow rate and oxygenation level at the system outlet.
A method of extracorporeally processing blood during a surgical procedure comprising:
- providing apparatus comprising a controller and a housing having an inlet and an outlet, the housing enclosing a blood pump comprising a plurality of vanes affixed to a first shaft and an oxygenator having a second shaft and a multiplicity of hollow fibers affixed to the second shaft, each one of the multiplicity of hollow fibers having a first end coupled to a gas inlet manifold and a second end coupled to a gas outlet manifold;
- inputting to the controller a user-selected blood flow rate and oxygenation level at the outlet;
- receiving blood through the inlet;
- rotating the first shaft at a first speed to circulate blood under pressure to the oxygenator;
- and
- rotating the second shaft at a second speed to oxygenate the blood supplied to the oxygenator and to circulate oxygenated blood under pressure to the outlet;
- and
- adjusting the first and second speeds to supply oxygenated blood to the outlet at the user-selected blood flow rate and oxygenation level.
Dependencies are inferred from the claim text.