Method and apparatus for percutaneous aortic valve replacement
A catheter adapted for placement in the ascending aorta comprises a central catheter mechanism and a balloon structure or other occluding structure at its distal end. The catheter may be placed over the aortic arch such that the balloon structure is placed in the ascending aorta just above the Sinus of Valsalva and coronary ostia. Once in place, the balloon structure is inflated to control blood flow through the aorta during aortic valve ablation and replacement protocols.
1. A temporary aortic valve for placement in an ascending aorta of an adult patient to facilitate percutaneous aortic valve replacement, said valve comprising a central catheter mechanism and an expandable occluding means surrounding a distal end of the central catheter mechanism, wherein said occluding means has a contracted mode where it can be delivered and withdrawn percutaneously to and from the ascending aorta and a fully expanded mode where it is in touching contact with the inside walls of said ascending aorta while only partially occluding the aorta, said catheter mechanism having a central passage for the stable transport of valve replacement tools while fully expanded occlusion member leaves gaps for continuous blood perfusion, wherein the cross-sectional area of said gaps left by said occluding means when fully expanded falls within a range of between 25% and 60% of the cross sectional area of the aortic valve area.
2. The temporary aortic valve of claim 1 wherein the aortic valve area is 3 cm 2 and said the cross-sectional area of the gaps left by said occluding means when fully expanded is at least 0.75 cm 2 .
3. The temporary aortic valve of claim 1 wherein said valve is adapted to be positioned within the ascending aorta just above the Sinus of Valsalva and coronary ostia.
4. The temporary aortic valve of claim 1 wherein said expandable means is an inflatable means.
5. The temporary aortic valve of claim 4 wherein said inflatable means comprises a plurality of inflatable balloons.
6. The temporary aortic valve of claim 4 wherein said inflatable means comprises three balloons of equal size and are arranged to provide gaps therebetween to allow continuous blood perfusion.
7. The temporary aortic valve of claim 5 wherein said balloons are of unequal size and are arranged to provide gaps therebetween to allow continuous blood perfusion.