Editing Donald Shiley (section)

==Career==
Shiley began working at [[Edwards Laboratories]], located in [[Orange County, California]], south of [[Los Angeles]], the first manufacturer of artificial heart-valves.<ref name=Perry2010>{{cite news |last1=Perry |first1=Tony |title=Donald P. Shiley dies at 90; co-inventor of Bjork-Shiley heart valve |url=https://www.latimes.com/local/obituaries/la-me-donald-shiley-20100807-story.html |access-date=June 5, 2014 |newspaper=[[Los Angeles Times]] |date=August 7, 2010}}</ref>

Later he established his own company, Shiley Laboratories, in the same area. His first valve was developed together with the American heart-surgeon Kay, and was the first disc heart-valve. Compared with the [[Edwards valve]], which had the shape of a little ball, the disc valve needed much less space within the heart when implanted.

Some years later, Shiley improved his design in cooperation with Swedish heart surgeon [[Viking Björk]], which led to the first tilting disc heart-valve, resulting in a much better flow of blood through the valve.

Shiley Labs developed and manufactured other products, especially [[Vertebrate trachea|trachea]]l and endotracheal tubes for respiration after surgery in the mouth or throat, and during [[anesthesia]].{{Citation needed|date=June 2019}}

The Björk–Shiley heart valve underwent several improvements in the following years, primarily in the degree of opening of the disc, thus reducing turbulence in the bloodstream.

Some years later, Shiley decided to sell his company to [[Pfizer]], and retired.