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. There 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 method for regulating aortic regurgitation during an aortic valve diagnostic or treatment procedure, said method comprising:
advancing a catheter shaft through a vasculature of a patient so that a flexible occluding membrane having a lateral side coupled to the catheter shaft is positioned within the ascending aorta of the patient above the Sinus of Valsalva and coronary ostia,
wherein blood flow in the aorta causes the flexible occluding membrane to alternate between an expanded occluding configuration and a collapsed lesser occluding configuration in synchrony with ventricular diastole and systole, and
wherein expansion of the flexible occluding member during ventricular diastole inhibits aortic regurgitation while allowing perfusion of the coronary arteries via the Sinus of Valsalva by an opening on the flexible occluding membrane.
2. The method of claim 1 , wherein blood flow in the aorta during ventricular diastole causes the flexible occluding membrane to assume the expanded occluding position.
3. The method of claim 1 , wherein the opening is positioned at substantially a center of the flexible occluding membrane.
4. The method of claim 3 , wherein the opening and the center of the flexible occluding membrane are disposed at a distal tip of the flexible occluding membrane.
5. The method of claim 1 , wherein the opening is the positioned at a location offset from a center of the flexible occluding membrane.
6. The method of claim 1 , wherein perfusion of the coronary arteries via the Sinus of Valsalva is allowed by a plurality of openings on the flexible occluding membrane.
7. The method 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.
8. The method of claim 1 , further comprising expanding a distal anchoring loop on the catheter shaft to a curved configuration to anchor the catheter shaft and the flexible occluding membrane in the aorta.
9. The method of claim 1 , wherein the flexible occluding membrane has a conical shape and an annular proximal lip, wherein blood flow in the aorta during diastole causes the annular proximal lip to appose an inner wall of the aorta.
10. The method of claim 1 , wherein blood flow in the aorta during ventricular systole causes the flexible occluding membrane to assume the collapsed lesser occluding configuration.
11. The method of claim 10 , wherein collapse of the flexible occluding membrane during ventricular systole lessens inhibition of blood flow from a left ventricle of the patient to the aorta.
12. The method of claim 1 , further comprising performing an aortic valve replacement or repair procedure while blood flow in the aorta continues to cause the flexible occluding membrane to alternate between the expanded occluding configuration and the collapsed lesser occluding configuration in synchrony with diastole and systole.
13. The method of claim 12 , wherein performing the valve replacement or repair procedure comprises advancing a replacement valve through a lumen of the catheter shaft.
14. The method of claim 1 , wherein advancing the catheter shaft comprises advancing the catheter shaft over an aortic arch of the patient.
15. The method of claim 1 , wherein advancing the catheter shaft comprises advancing the catheter shaft transapically, transaortically, or transfemorally.