Percutaneous 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 cardiovascular valve apparatus comprising:
a catheter shaft adapted for placement within an artery of a patient; and
a flexible membrane having a lateral side coupled to the catheter shaft, a proximal end, a distal end, and an opening at the distal end,
wherein the flexible membrane is adapted to, when placed within the artery with the distal end of the flexible membrane oriented toward blood flow within the artery, alternate between an expanded occluding configuration and a collapsed configuration in response to the blood flow and in synchrony with ventricular diastole and systole,
wherein the flexile membrane inhibits the blood flow within the artery when in the expanded occluding configuration and lessens inhibition of the blood flow when in the collapsed configuration, and
wherein the opening allows blood perfusion therethrough when the membrane is in the expanded occluding configuration within the artery.
2. The temporary cardiovascular valve apparatus of claim 1 , wherein the opening is positioned at substantially a center of the membrane.
3. The temporary cardiovascular valve apparatus of claim 2 , wherein the center of the membrane is disposed at the distal end of the membrane.
4. The temporary cardiovascular valve apparatus of claim 1 , wherein the opening is positioned at a location offset from a center of the membrane.
5. The temporary cardiovascular valve apparatus of claim 1 , wherein the membrane has a plurality of openings to allow blood perfusion therethrough when in the expanded occluding configuration.
6. The temporary cardiovascular 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 artery.
7. The temporary cardiovascular 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 membrane in the aorta and a collapsed, straightened configuration for advancement into or retraction from the artery.
8. The temporary cardiovascular valve apparatus of claim 1 , wherein the membrane has a conical shape.
9. The temporary cardiovascular valve apparatus of claim 8 , wherein the conically-shaped membrane comprises an annular proximal lip adapted to appose an inner wall of the artery when the membrane is in the expanded occluding configuration.
10. The temporary cardiovascular valve apparatus of claim 1 , wherein the membrane is adapted to be positioned within an ascending aorta of the patient to provide occlusion therein.
11. The temporary cardiovascular valve apparatus of claim 10 , wherein the membrane is adapted to be positioned within the ascending aorta just above the Sinus of Valsalva and coronary ostia.
12. The temporary cardiovascular valve apparatus of claim 10 , wherein the membrane is adapted to be positioned within the ascending aorta between the coronary ostia and the brachiocephalic artery.