Blood pump with expandable cannula
First Claim
Patent Images
1. An apparatus for inducing motion of a fluid relative to the apparatus, comprising:
- an elongated expandable cannula having an inlet end, an outlet end and a diameter expandable to a diameter greater than a delivery diameter, the expandable cannula comprising;
a generally tubular reinforcing matrix; and
a polymer at least partially disposed over an exterior of the reinforcing matrix;
an impeller positioned in the elongated expandable cannula; and
a retainer sheath configured to be withdrawn from the expandable cannula to permit the expandable cannula to expand and to be advanceable over the expandable cannula to compress the expandable cannula;
wherein the expandable cannula is configured to be collapsed by the retainer sheath without requiring a funnel or other distally enlarged structure.
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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.
388 Citations
26 Claims
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1. An apparatus for inducing motion of a fluid relative to the apparatus, comprising:
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an elongated expandable cannula having an inlet end, an outlet end and a diameter expandable to a diameter greater than a delivery diameter, the expandable cannula comprising; a generally tubular reinforcing matrix; and a polymer at least partially disposed over an exterior of the reinforcing matrix; an impeller positioned in the elongated expandable cannula; and a retainer sheath configured to be withdrawn from the expandable cannula to permit the expandable cannula to expand and to be advanceable over the expandable cannula to compress the expandable cannula; wherein the expandable cannula is configured to be collapsed by the retainer sheath without requiring a funnel or other distally enlarged structure. - View Dependent Claims (2)
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3. An apparatus for inducing motion of a fluid relative to the apparatus, the apparatus comprising:
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an elongated cannula having an expandable portion having an inlet end, an outlet end and a diameter expandable to a diameter greater than a delivery diameter, the expandable portion comprising; a generally tubular reinforcing matrix comprising; a plurality of circumferential rings each having an undulating pattern including a plurality of apexes pointing proximally and defining a plurality of recesses distally; a plurality of connectors connecting one of the apexes pointing proximally in one of the rings to an adjacent one of the rings; and an impeller positioned in the elongated cannula. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for inducing motion of a fluid relative to the apparatus, comprising:
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an elongated cannula having an expandable portion having an inlet end, an outlet end and a diameter expandable to a diameter greater than a delivery diameter, the expandable portion comprising; a generally tubular reinforcing matrix; a layer of a first polymer at least partially coating an exterior of the reinforcing matrix, the reinforcing matrix including a plurality of circumferential rings each having an undulating pattern including a plurality of apexes pointing toward the outlet end and defining a plurality of recesses pointing toward the inlet end; the reinforcing matrix including members coupled at distal ends with a corresponding apexes, the members having proximal ends disposed proximal of the corresponding apex; and at least one region of a second polymer different from the first polymer that overlies the first polymer layer and extends between one of the apexes pointing toward the outlet end in one of the rings and at least one other ring; and an impeller positioned in the elongated cannula. - View Dependent Claims (26)
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Specification