Circulatory support pump centering anchoring and centering device
Embodiments in the present disclosure relate to an anchoring and centering device for a circulatory support pump. An exemplary apparatus comprises an expandable anchoring device extending along a longitudinal axis, wherein the expandable anchoring device is arranged about a central axis. A distal portion of the expandable anchoring device defines an annulus through which the cardiac pump can be arranged and to which the cardiac pump can be releasable coupled. A proximal portion of the expandable anchoring device is configured to circumferentially expand to an unconstrained configuration that has a cross-sectional diameter greater than a diameter of the annulus. The exemplary apparatus also includes a constraining member arranged over the expandable anchoring device to constrain the expandable anchoring device in a constrained configuration for delivery of the anchoring apparatus.
1. A method for delivering an anchoring apparatus for positioning a cardiac pump, the method comprising:
arranging the anchoring apparatus over or within a delivery catheter, the anchoring apparatus comprising:
an expandable anchoring device extending along a longitudinal axis, wherein the expandable anchoring device is arranged about a central axis, wherein a distal portion of the expandable anchoring device defines an annulus through which the cardiac pump can be arranged and to which the cardiac pump can be releasable coupled, and wherein a proximal portion of the expandable anchoring device is configured to circumferentially expand to an unconstrained configuration that has a cross-sectional diameter greater than a diameter of the annulus; and
a constraining member arranged over the expandable anchoring device to constrain the expandable anchoring device in a constrained configuration for delivery of the anchoring apparatus;
arranging a cardiac pump within a subject's heart; and subsequently
advancing the anchoring apparatus within the subject's aorta and over the cardiac pump arranged within the subject's heart;
releasably coupling the anchoring apparatus to the cardiac pump; and
actuating the anchoring apparatus from its constrained configuration.
2. The method of claim 1 , wherein the anchoring apparatus further comprises an actuation member, wherein the constraining member is a sheath arranged around the proximal portion that comprises at least one aperture, and wherein actuating the anchoring apparatus comprises actuating the actuation member so the anchoring apparatus projects through the at least one aperture of the sheath.
3. The method of claim 1 , wherein the constraining member is a sheath arranged around the proximal portion, and wherein actuating the anchoring apparatus comprises translating the sheath so that it is no longer arranged around the proximal portion.
4. The method of claim 1 , wherein the distal portion includes an elongate member that is secured to a coupling loop of the cardiac pump via an interference fit, and wherein releasably coupling the anchoring apparatus to the cardiac pump comprises inserting the elongate member through the coupling loop.
5. The method of claim 1 , further comprising removing the anchoring apparatus by arranging the constraining member over the expandable anchoring device and withdrawing the anchoring apparatus.
6. The method of claim 1 , wherein the proximal portion has a conical shape.
7. The method of claim 1 , wherein the distal portion comprises portions that are overlapping when in the constrained configuration and are non-overlapping when in the unconstrained configuration.
8. The method of claim 7 , wherein the plurality of proximal portions comprise a plurality of separate, elongate members.
9. The method of claim 1 , wherein the proximal portion comprises a plurality of proximal portions that, are configured to expand equidistant from the central axis when in the unconstrained configuration.
10. The method of claim 1 , further comprising engaging the subject's aorta with the anchoring apparatus in its unconstrained configuration.
11. The method of claim 10 , wherein engaging the subject's aorta with the anchoring apparatus in its unconstrained configuration centers the cardiac pump in the subject's aortic valve.