Impedance plethysmograph

USRE30101E · kind E · reissue

Assignee

• Regents of the University of Minnesota · US

Inventors

• William G. Kubicek · Rosemount, US
• Edwin Kinnen · Pittsford, US
• Robert Patterson · Minneapolis, US
• David A. Witsoe · Libertyville, US

Key dates

• Filing date: Jun 23, 1975
• Grant date: Sep 25, 1979
• Expiry date: Jun 23, 1995

Classification

• Technology area (CPC —): General

Abstract

.Iadd.Cardiac output is measured by connecting excitation electrodes at the upper and lower ends of the thorax of a mammalian subject, connecting measuring electrodes to the thorax between the excitation electrodes, applying a constant fluctuating excitation current to the excitation electrodes, measuring, with appropriate circuitry, changes in impedance within the thorax, and simultaneously measuring the beginning and end of systole, and determining cardiac output by measuring the maximum decreasing impedance slope during systole..Iaddend.