The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 22, 2010
Filed:
Nov. 29, 2004
Eric W. Starr, Allison Park, PA (US);
James A. Scull, Durham, NC (US);
Eric Ayers, Aliquippa, PA (US);
Bernie F. Hete, Kittanning, PA (US);
Donald S. Wilczek, Verona, PA (US);
Mark H. Sanders, Wexford, PA (US);
Eric W. Starr, Allison Park, PA (US);
James A. Scull, Durham, NC (US);
Eric Ayers, Aliquippa, PA (US);
Bernie F. Hete, Kittanning, PA (US);
Donald S. Wilczek, Verona, PA (US);
Mark H. Sanders, Wexford, PA (US);
Ric Investments, LLC, Wilmington, DE (US);
Abstract
A method and apparatus for monitoring changes in the intra-thoracic pressure of a patient due to the patient's respiratory activity or volumetric changes in the extra-thoracic arterial circulatory system due to cardiac function based on the changes in pressure in the patient's extra-thoracic arterial circulatory system as measured by a plethysmography sensor, such as an photoplethysmograph. A frequency spectrum is generated for the plethysmograph signal and the frequencies of interest is isolated from the frequency spectrum by setting appropriate cutoff frequencies for the frequency spectrum. This isolated frequency is used to filter the plethysmograph signal to provide a signal indicative of the patient's respiratory activity or cardiac function. For corrections for breathing frequency roll-off and deviations of the I:E ratio from 1:1.