The invention evaluates the mechanical condition of a heart in a patient by noninvasively providing a pulse signal representative of arterial pulsation by placing a transducer sufficiently close to the skin of the patient to provide an electric signal representative of the arterial pulsation. The patient...http://www.google.de/patents/US5291895?utm_source=gb-gplus-sharePatent US5291895 - Evaluation of heart mechanical performance
