Heart assist device with expandable impeller pump
First Claim
1. A catheter pump comprising:
- a cannula having an inlet and an outlet;
an impeller disposed in the cannula, the impeller sized and shaped to be inserted into a heart of a patient; and
a stator disposed downstream of the impeller in the cannula between the impeller and the outlet, the stator comprising a stationary blade configured to reduce swirl velocity from discharge flow from the impeller,wherein the stationary blade comprise an expanded state and wherein a proximal edge of the stationary blade is inclined distally in the expanded state.
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Accused Products
Abstract
An impeller includes a hub and a blade supported by the hub. The impeller has a stored configuration in which the blade is compressed so that its distal end moves towards the hub, and a deployed configuration in which the blade extends away from the hub. The impeller may be part of a pump for pumping fluids, such as blood, and may include a cannula having a proximal portion with a fixed diameter, and a distal portion with an expandable diameter. The impeller may reside in the expandable portion of the cannula. The cannula may have a compressed diameter which allows it to be inserted percutaneously into a patient. Once at a desired location, the expandable portion of the cannula may be expanded and the impeller expanded to the deployed configuration. A flexible drive shaft may extend through the cannula for rotationally driving the impeller within the patient.
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Citations
26 Claims
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1. A catheter pump comprising:
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a cannula having an inlet and an outlet; an impeller disposed in the cannula, the impeller sized and shaped to be inserted into a heart of a patient; and a stator disposed downstream of the impeller in the cannula between the impeller and the outlet, the stator comprising a stationary blade configured to reduce swirl velocity from discharge flow from the impeller, wherein the stationary blade comprise an expanded state and wherein a proximal edge of the stationary blade is inclined distally in the expanded state. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A catheter pump comprising:
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a cannula having an inlet and an outlet; an impeller disposed in the cannula, the impeller and cannula sized and shaped to be inserted into a heart of a patient; and a plurality of stationary blades disposed downstream of the impeller between the impeller and the outlet, the stationary blades being arranged about a rotational axis of the impeller, the plurality of stationary blades acting as a stator on fluid flowing from the impeller, through the stationary blades and thereafter out of the outlet, wherein the stationary blades are coupled with a cylindrical member disposed proximally of the impeller, the cylindrical member being disposed about the rotational axis of the impeller, and wherein the stationary blades comprise a first end fixedly attached to the cylindrical member and a second end spaced radially away from the first end. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A catheter pump comprising:
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a cannula having an inlet and an outlet; an impeller disposed in the cannula, the impeller and cannula sized and shaped to be inserted into a heart of a patient; and a plurality of stationary blades disposed downstream of the impeller between the impeller and the outlet, the stationary blades being arranged about a rotational axis of the impeller, the plurality of stationary blades acting as a stator on fluid flowing from the impeller, through the stationary blades and thereafter out of the outlet, wherein the stationary blades comprise an expanded state and wherein a proximal edge of at least one of the stationary blades is inclined distally in the expanded state. - View Dependent Claims (24, 25, 26)
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Specification