Cardiac valve procedure methods and devices
Devices and methods for performing intravascular procedures without cardiac bypass include embodiments of temporary filter devices, temporary valves, and prosthetic valves. The temporary filter devices have a cannula which provides access for surgical tools for effecting repair of cardiac valves. The cannula may have filters which prevent embolitic material from entering the coronary arteries and aorta. The valve devices may also have a cannula for insertion of the valve into the aorta. The valve devices expand in the aorta to occupy the entire flow path of the vessel and operate to prevent blood flow and to permit flow through the valve. The prosthetic valves include valve fixation devices which secure the prosthetic valve to the wall of the vessel. The prosthetic valves are introduced into the vascular system in a compressed state, advanced to the site of implantation, and expanded and secured to the vessel wall.
1. A valved filter device for use in repair and replacement of cardiac valves, the device comprising:
an elongated tube of filter material, said tube being closed at a distal end thereof and open at a proximal end thereof;
a membrane; and
a valve seating retaining ring fixed on the proximal end of said tube and comprising an inner surface; wherein the membrane is tethered at spaced first portions thereof to the inner surface of the valve seating retaining ring at multiple spaced apart fixation points around the circumference of ring, the membrane portions between the spaced first portions of the membrane being expandable against the inner surface under diastolic pressure to form a generally parabolic cone substantially blocking flow of blood therethrough, and compressible under systolic pressure to form a substantially non-flow blocking configuration to permit flow of blood therethrough.
2. The valved filter device in accordance with claim 1 and further comprising a catheter extending through a central portion of said tube, an apex portion of the membrane being tethered to said catheter.
3. The valved fitter device in accordance with claim 2 and further comprising skeletal members supporting said tube, said skeletal members including radial struts operative to retain said catheter in the tube central portion and collapsible so as to render the device circumferentially compressible.
4. The valved filter device in accordance with claim 1 , wherein expansion and compression of the membrane expands and compresses, respectively, the ring and proximal end of the tube that is attached to the ring.