This type of stroke is the most common. A blood clot â a clump of blood that sticks together â is usually to blame for ischemic strokes. They can also happen when arteries become narrow and clogged with plaque. Plaque is a mix of cholesterol and other fatty stuff that sticks to the walls of blood vessels.
Premarket Approval (PMA) A PMA submission is used to demonstrate to the FDA that a new or modified device is safe and effective. This standard is higher than is required for 510(k) submissions. Human use data from a formal clinical study is almost always required in addition to laboratory studies.
MARPA is the non-profit trade association that represents the Parts Manufacturer Approval (PMA) community. PMA is an FAA design and production approval that verifies that the design of an aircraft part meets FAA safety regulations, and the fabrication inspection system meets FAA quality standards designed to assure that every part actually produced continues to meet the FAA-approved design.