Heart assist device with expandable impeller pump
First Claim
1. An apparatus for inducing motion of a fluid relative to the apparatus, the apparatus comprising:
- an expandable cannula having a mesh comprising an undulating pattern, the expandable cannula having a proximal portion and a distal portion and a plurality of struts, each strut of the plurality extending from the proximal portion of the expandable cannula to a non-expandable portion of the apparatus, the proximal portion of the expandable cannula being expandable, the expandable cannula and the struts arranged to facilitate recollapse of the cannula; and
an impeller positioned, at least in part, in an expandable portion of the expandable cannula, the impeller positioned distal the non-expandable portion of the apparatus.
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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
61 Claims
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1. An apparatus for inducing motion of a fluid relative to the apparatus, the apparatus comprising:
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an expandable cannula having a mesh comprising an undulating pattern, the expandable cannula having a proximal portion and a distal portion and a plurality of struts, each strut of the plurality extending from the proximal portion of the expandable cannula to a non-expandable portion of the apparatus, the proximal portion of the expandable cannula being expandable, the expandable cannula and the struts arranged to facilitate recollapse of the cannula; and an impeller positioned, at least in part, in an expandable portion of the expandable cannula, the impeller positioned distal the non-expandable portion of the apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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37. A heart pump comprising:
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a cannula having an expandable and collapsible portion comprising a mesh, the mesh comprising a plurality of circumferential rings, wherein at least some adjacent circumferential rings are at least partially interleaved; and an impeller positioned in the cannula. - View Dependent Claims (38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52)
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53. A heart pump comprising:
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a cannula having an expandable portion having a mesh, the mesh having a thickness and a density; and an impeller comprising one or more blades positioned in the expandable portion of the cannula and configured to rotate in an operational configuration of the heart pump, wherein at least one of the thickness and density of the mesh is configured such that, when the impeller rotates in the operational configuration, a tip gap between a tip of the one or more blades and an inner wall of the cannula is substantially constant. - View Dependent Claims (54, 55, 56, 57, 58, 59)
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60. A heart pump comprising:
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a cannula having an expandable and collapsible portion comprising a mesh, the mesh comprising a plurality of circumferential rings; and an impeller positioned in the cannula, wherein a plane disposed orthogonal to a longitudinal axis of the heart pump intersects at least two adjacent circumferential rings. - View Dependent Claims (61)
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Specification