Ventricular assist device for intraventricular placement
A ventricular assist device includes a pump such as an axial flow pump, an outflow cannula connected to the outlet of the pump, and an anchor element. The anchor element is physically connected to the pump, as by an elongate element. The pump is implanted within the left ventricle with the outflow cannula projecting through the aortic valve but desirably terminating short of the aortic arch. The anchor element is fixed to the wall of the heart near the apex of the heart so that the anchor element holds the pump and outflow cannula in position.
1. A ventricular assist device for intraventricular placement inside a heart of a mammalian subject comprising:
an anchor element configured to be mounted to the subject's heart;
a rigid elongate member having proximal and distal ends; and a pump comprising a housing, an inlet and an outlet, a rotor within the housing and electric drive coils carried on the housing for magnetically driving the rotor,
wherein the anchor element and the pump are connected to the elongate member remote from one another,
wherein the elongate member includes a bore extending in the proximal and distal direction thereof, the device further comprising wiring extending through the bore to the pump, and
wherein the anchor element includes a spherical socket adapted to engage a spherical ball mounted to the elongate member such that the anchor element is pivotally mounted to the elongate member.
2. The ventricular assist device of claim 1 wherein the anchor element is configured to be mounted to the subject's heart adjacent the apex thereof.
3. The ventricular assist device of claim 1 , wherein the pump has an axis extending between the inlet and the outlet, and the elongate member has an axis offset from the axis of the pump.
4. The ventricular assist device of claim 3 , wherein the axis of the elongate member is parallel to the axis of the pump.
5. The ventricular assist device of claim 1 , wherein the anchor element is fixed to the elongate member.
6. The ventricular assist device of claim 1 wherein the anchor element is a ring adapted for fixation on the exterior surface of the heart wall.
7. The ventricular assist device of claim 1 , wherein the elongate member has a hydrodynamic outer surface.
8. The ventricular assist device of claim 1 , wherein the elongate member is curved.
9. The ventricular assist device of claim 1 , wherein the elongate member is channel shaped.
10. The ventricular assist device of claim 1 having a plurality of anchor elements and elongate members.
11. The ventricular assist device of claim 1 , wherein the anchor element is non-circular in cross-section.
12. The ventricular assist device of claim 1 wherein the anchor element is adapted to bear on the interior of surface of the heart wall.
13. The ventricular assist device of claim 1 , further comprising a tubular outflow cannula defining a bore, the bore having an inlet at a proximal end thereof connected to the outlet of the pump.
14. The ventricular assist device of claim 13 , wherein the outflow cannula includes a tip at the distal end thereof, the tip having a plurality of openings.
15. The ventricular assist device of claim 14 , wherein the pump is adapted to be positioned such that the tip of the outflow cannula projects through an aortic valve but terminates short of an arch of the aorta.
16. The ventricular assist device of claim 13 , wherein the outflow cannula is tapered in the distal direction.
17. The ventricular assist device of claim 13 , wherein the outflow cannula has a generally triangular cross-section at a region proximal to the tip.
18. The ventricular assist device of claim 13 , wherein the outflow cannula includes a plurality of side holes extending between the bore of the cannula and an exterior surface of the cannula proximal to the tip of the cannula.
19. The ventricular assist device of claim 1 , wherein the anchor element is a ring adapted for mounting adjacent the apex of the patient's heart by sewing the ring to tissue along a wall of the patient's heart.
20. The ventricular assist device of claim 1 , wherein the position of the anchor element in the lengthwise direction of the elongate member is adjustable.