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:
Mar. 05, 2024
Filed:
Aug. 11, 2020
Apple Inc., Cupertino, CA (US);
Thomas J. Sullivan, Cupertino, CA (US);
Wren Nancy Dougherty, San Francisco, CA (US);
Richard C. Kimoto, Cupertino, CA (US);
Erno Klaassen, Cupertino, CA (US);
Ravi K. Narasimhan, Sunnyvale, CA (US);
Stephen J. Waydo, Cupertino, CA (US);
Todd K. Whitehurst, Cupertino, CA (US);
Derek Park-Shing Young, Cupertino, CA (US);
Santiago Quijano, Cupertino, CA (US);
Zijing Zeng, Cupertino, CA (US);
Apple Inc., Cupertino, CA (US);
Abstract
A pulse transit time is measured non-invasively and used to calculate a blood pressure value. A method of determining one or more blood pressure values includes propagating an alternating drive current through a thorax of a subject via electrodes located on a wrist-worn device. Resulting voltage levels of the subject are sensed by the wrist-worn device. The voltage levels are processed to detect when a volume of blood is ejected from the left ventricle. Output from a pulse arrival sensor coupled to the wrist-worn device is processed to detect when a blood pressure pulse generated by ejection of the volume of blood from the left ventricle arrives at the wrist. A pulse transit time (PTT) for transit of the blood pressure pulse from the left ventricle to the wrist is calculated. One or more blood pressure values for the subject are determined based on the PTT.