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. An apparatus, comprising:
a cardiac pump comprising a cannula configured to draw blood from a left ventricle of a heart of a subject into an inflow distal section of the cardiac pump, and the cardiac pump configured to release the blood into the aorta of the subject from a plurality of outflow windows in an outflow proximal section of the cardiac pump;
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 a proximal region of the cardiac pump can be coupled, and wherein a proximal portion of the expandable anchoring device has a conical shape and is configured to circumferentially expand to an unconstrained configuration that has a cross-sectional diameter greater than a diameter of the annulus and thereby engages an inner circumference of the aorta; and
a constraining member arranged over the expandable anchoring device to constrain the expandable anchoring device in a constrained configuration for delivery of the expandable anchoring device;
wherein when the expandable anchoring device is coupled to the cardiac pump and expanded within the aorta, the plurality of outflow windows are positioned distal and upstream of the proximal portion of the expandable anchoring device that is engaged with the inner circumference of the aorta.
2. The apparatus 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 and engage the aortic wall.
3. The apparatus of claim 2 , wherein the plurality of proximal portions comprise a plurality of separate, elongate members configured to engage the aortic wall.
4. The apparatus of claim 3 , wherein the plurality of separate, elongate members are barbs configured to engage the aortic wall.
5. The apparatus of claim 2 , wherein the plurality of proximal portions comprises a plurality of loop elements.
6. The apparatus 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.
7. An apparatus comprising:
a cardiac pump comprising a cannula configured to draw blood from a left ventricle of a heart of a subject into an inflow distal section of the cardiac pump, and the cardiac pump configured to release the blood into the aorta of the subject from a plurality of outflow windows in an outflow proximal section of the cardiac pump;
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 a proximal region of the cardiac pump can be 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 thereby engages an inner circumference of the aorta; and
a constraining member arranged over the expandable anchoring device to constrain the expandable anchoring device in a constrained configuration for delivery of the expandable anchoring device;
wherein when the expandable anchoring device is coupled to the cardiac pump and expanded within the aorta, the plurality of outflow windows are positioned distal and upstream of the proximal portion of the expandable anchoring device that is engaged with the inner circumference of the aorta;
wherein the proximal portion of the expandable anchoring device comprises a membrane, the membrane comprising portions that are overlapping when in the constrained configuration and are non-overlapping when in the unconstrained configuration.
8. The apparatus of claim 1 , further comprising a delivery catheter, wherein the delivery catheter has a tricuspid cross-sectional shape, and wherein the expandable anchoring device is arranged over the delivery catheter during delivery of the expandable anchoring device.
9. The apparatus of claim 1 , wherein the expandable anchoring device is formed from nitinol.
10. An apparatus, comprising:
a cardiac pump comprising a cannula configured to draw blood from a left ventricle of a heart of a subject, and the cardiac pump configured to release the blood into the aorta of the subject;
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 a proximal region of the cardiac pump can be 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 thereby engages an inner circumference of the aorta; and
a constraining member arranged over the expandable anchoring device to constrain the expandable anchoring device in a constrained configuration for delivery of the expandable anchoring device;
wherein the cardiac pump is configured to be placed within the heart of the subject before delivery of the expandable anchoring device within the aorta and coupling of the expandable anchoring device to the cardiac pump;
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 and engage the aortic wall, wherein the plurality of proximal portions comprises a plurality of loop elements.
11. The apparatus of claim 10 , wherein the plurality of loop elements comprise a plurality of separate, elongate loop elements configured to engage the aortic wall.
12. The apparatus of claim 11 , wherein the plurality of separate, elongate loop elements include barbs configured to engage the aortic wall.
13. The apparatus of claim 10 , wherein the distal portion includes an elongate member that is secured to a coupling loop of the cardiac pump via an interference fit.
14. The apparatus of claim 10 , wherein the proximal portion of the expandable anchoring device comprises a membrane, the membrane comprising portions that are overlapping when in the constrained configuration and are non-overlapping when in the unconstrained configuration.
15. The apparatus of claim 10 , further comprising a delivery catheter, wherein the delivery catheter has a tricuspid cross-sectional shape, and wherein the expandable anchoring device is arranged over the delivery catheter during delivery of the expandable anchoring device.