Percutaneuous temporary aortic valve
Methods and apparatuses for regulating aortic regurgitation are provided. A catheter shaft is advanced through vasculature so that a flexible occluding membrane coupled to the catheter shaft is positioned within the aorta, typically the ascending aorta above the Sinus of Valsalva and coronary ostia. Blood flow in the aorta causes the flexible occluding membrane to alternate between an expanded occluding configuration while in diastole and a collapsed lesser occluding configuration is systole. The flexible occluding membrane thereby acts as a temporary aortic valve. The flexible occluding membrane is generally conical in shape, with the tip of the cone disposed closer to the aorta than the proximal rim. In diastole, blood flow expands the flexible occluding membrane so that the proximal rim apposes the inner wall of the aorta. The flexible occluding membrane will have one or more openings to allow perfusion of the coronary arteries in diastole.
1. A temporary aortic valve apparatus comprising:
a catheter shaft adapted to be advanced through a vasculature of a patient for placement within an aorta of the patient; and
a flexible occluding membrane having a lateral side coupled to the catheter shaft and adapted to alternate between an expanded occluding configuration and a collapsed lesser occluding configuration in the aorta in response to blood flow from a left ventricle of the patient and in synchrony with ventricular diastole and systole,
wherein, when deployed in the aorta, the flexible occluding membrane is configured to inhibit blood flow from the left ventricle in the expanded configuration and to lessen inhibition of said blood flow when in the collapsed configuration, and
wherein the flexible occluding membrane has an opening to allow blood perfusion therethrough when in the expanded occluding configuration.
2. The temporary aortic valve apparatus of claim 1 , wherein the flexible occluding membrane is adapted to assume the expanded occluding configuration in response to blood flow in the aorta during ventricular diastole.
3. The temporary aortic valve apparatus of claim 1 , wherein the flexible occluding membrane is adapted to assume the collapsed lesser occluding configuration in the aorta in response to blood flow therein during ventricular systole.
4. The temporary aortic valve apparatus of claim 1 , wherein the opening is positioned at substantially a center of the flexible blood occluding membrane.
5. The temporary aortic valve apparatus of claim 4 , wherein the opening and the center of the flexible occluding membrane are disposed at a distal tip of the flexible blood occluding membrane.
6. The temporary aortic valve apparatus of claim 1 , wherein the opening is positioned at a location offset from a center of the flexible occluding membrane.
7. The temporary aortic valve apparatus of claim 1 , wherein the flexible occluding membrane has a plurality of openings to allow blood perfusion therethrough when in the expanded occluding configuration.
8. The temporary aortic valve apparatus of claim 1 , wherein the opening has a cross-sectional size of 50% or less, 45% or less, 40% or less, 35% or less, 30% or less, 25% or less, 20% or less, 15% or less, 10% or less, or 5% or less of the aorta.
9. The temporary aortic valve apparatus of claim 1 , wherein the catheter shaft comprises a distal anchoring loop having an expanded, curved configuration for anchoring the catheter shaft and the flexible occluding membrane in the aorta and a collapsed, straightened configuration for advancement into or retraction from the aorta.
10. The temporary aortic valve apparatus of claim 1 , wherein the flexible occluding membrane has a conical shape.
11. The temporary aortic valve apparatus of claim 10 , wherein the conically-shaped flexible occluding membrane comprises an annular proximal lip adapted to appose an inner wall of the aorta when the flexible occluding membrane is in the expanded occluding configuration.
12. The temporary aortic valve apparatus of claim 1 , wherein the flexible occluding membrane is adapted to be positioned within an ascending aorta of the patient to provide occlusion therein.
13. The temporary aortic valve apparatus of claim 12 , wherein the flexible occluding membrane is adapted to be positioned within the ascending aorta just above the Sinus of Valsalva and coronary ostia.