ALEXANDRIA, Va., April 7 -- United States Patent no. 12,594,389, issued on April 7, was assigned to MAQUET CRITICAL CARE AB (Solna, Sweden).

"Non-invasive estimation of hemodynamic parameters during mechanical ventilation" was invented by Carl-Erik Troili (Danderyd, Sweden) and Tomas Westerlund (Sollentuna, Sweden).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present disclosure relates to a method for non-invasive determination of a hemodynamic parameter of a mechanically ventilated subject (3) based on a point in time (thb) of a heartbeat of the subject and an arrival point in time (tarr_pulm, tarr_sys) at which a blood pressure pulse caused by the heartbeat reaches a point of arrival in the circulator...