| 摘要 |
The present invention discloses devices and methods for performing intravascular procedures without cardiac bypass. The devices include various embodiments of temporary filter devices (10), temporary valves (26), and prosthetic valves (90). The temporary filter devices (10) have one or more cannulae (2) which provide access for surgical tools for effecting repair of the cardiac valves. A cannula (2) may have filters (3) of various configurations encircling the distal region of the cannula, which prevents embolism material from entering the coronary arteries, and aorta. The temporary valve devices (26) may also have one or more cannulae (2') which guide insertion of the valve into the aorta. The valve devices (26) expand in the aorta to occupy the entire flow path of the vessel. In one embodiment, the temporary valve (26) is a disc of flexible, porous material that acts to filter blood passing therethrough. A set of valve leaflets extend peripherally from the disc. These leaflets can alternately collapse to prevent blood flow through the valve, and extend to permit flow. |
