Blood pump with expandable cannula
First Claim
Patent Images
1. A pump, comprising:
- an elongated cannula having a proximal portion and a distal portion;
an impeller positioned in the elongated cannula and configured to rotate about an axis; and
an expandable vane assembly positioned in the elongated cannula about the axis adjacent the impeller and having a deployed configuration and a stored configuration, the vane assembly comprising a vane, the vane in the deployed configuration extending away from the axis, the vane in the stored configuration compressed inwardly towards the axis relative to the deployed configuration.
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Abstract
A blood pump includes an impeller having a plurality of foldable blades and a cannula having a proximal portion with a fixed diameter, and a distal portion with an expandable diameter. The impeller can reside in the expandable portion of the cannula. The cannula has a collapsed condition for percutaneous delivery to a desired location within the body, and an expanded condition in which the impeller can rotate to pump blood. A flexible drive shaft can extend through the cannula for rotationally driving the impeller within the patient'"'"'s body.
393 Citations
29 Claims
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1. A pump, comprising:
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an elongated cannula having a proximal portion and a distal portion; an impeller positioned in the elongated cannula and configured to rotate about an axis; and an expandable vane assembly positioned in the elongated cannula about the axis adjacent the impeller and having a deployed configuration and a stored configuration, the vane assembly comprising a vane, the vane in the deployed configuration extending away from the axis, the vane in the stored configuration compressed inwardly towards the axis relative to the deployed configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A pump, comprising:
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an elongated cannula having a proximal portion and a distal portion, the distal portion comprising an expandable portion; an impeller disposed in the expandable portion; a sheath having a generally non-expanding distal portion; and one or more guidance aids configured to facilitate retraction of the expandable portion into the distal portion of the sheath when relative motion is provided between the distal portion of the sheath and the expandable portion. - View Dependent Claims (18, 19, 20, 21, 22)
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23. A method of pumping blood in a patient, comprising:
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inserting a blood pump into the patient, the blood pump comprising an elongated cannula, an impeller positioned in the elongated cannula, and an expandable vane assembly positioned in the elongated cannula near the impeller, the expandable vane assembly having a deployed configuration and a stored configuration, the vane assembly comprising a vane; positioning the blood pump in the patient so that the impeller is at a desired location; expanding the expandable vane assembly from the stored configuration to the deployed configuration within the elongated cannula; and rotating the impeller about an axis to pump blood through the elongated cannula. - View Dependent Claims (24, 25, 26, 27, 28, 29)
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Specification