On Feb. 28, 2005, Quinton Cardiology Systems and Cardiac Science announced the signing of a definitive merger agreement resulting in a combined company called Cardiac Science Corporation.

Quinton Instruments was founded in 1953 by University of Washington biomedical engineer Wayne Quinton with the initial focus of developing the first treadmill for cardiac stress testing. Quinton was a pioneering innovator and developer of over thirty biomedical devices ranging from treadmills to cardiac diagnostic equipment.