||Tilting disc valves
Tilting disc variety prosthetic valves
(Hall-Kaster left and Bjork-Shiley right). These valves tilt
into the left ventricle in diastole. These are older types but
demonstrate the principles of tilting discs with lesser (smaller)
and greater (larger) orifices.
Ball-cage type prostheses (Starr-Edwards
types). These have a cage that extends into the left ventricle
and the ball moves up and down. The cage is comprised of struts
which hold the moving ball. On the left is an older, silastic
Bi-leaflet prostheses are now common
for mitral valve replacement. Two leaflets tilt toward the left
ventricle in diastole, creating three actual orifices.
||Porcine heterograft valve
A porcine heterograft where porcine
aortic valve leaflets are suspended from stents covered with
a woven material.
A mitral valve ring shown in place
after a mitral valve repair. Note the anterior and posterior
mitral leaflets. The posterior has a suture line from a quadralateral