Mother's Day is a celebration honoring mothers and celebrating motherhood, maternal bonds and the influence of mothers in society. It is celebrated on various days in many parts of the world, yet most commonly in March, April, or May.
Coils, rings, and corrugated ribbon are the common forms of packing used in valves. The form of packing to be used in repacking a particular valve will depend on the valve size, application, and type. Packing materials will be discussed in more detail later in this chapter.
Carpentier-Edwards aortic stented porcine valves. 1  Made of pig aortic valves that have been treated in a preservation liquid and mounted on flexible frames. 2  The frame is designed to be flexible at the opening as well as where the leaflets come together replicating the native aortic valve.