公开(公告)号：US10517489B2

公开(公告)日：2019-12-31

申请号：US15507607

申请日：2015-09-08

Applicant: Apple Inc.

Inventor： Ravi Narasimhan ,  Richard C. Kimoto ,  Thomas J. Sullivan ,  Todd K. Whitehurst ,  Derek Park-shing Young ,  Zijing Zeng ,  Erno Klaassen

IPC: A61B5/021 ,  A61B5/11 ,  A61B5/00 ,  A61B5/024

Abstract: Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device includes an accelerometer, a photo-lethysmogram (PPG) or a pulse pressure sensor, and a controller. The PPG or the pulse pressure sensor coupled to the wrist-worn device for detecting an arrival of a blood pressure pulse at the user's wrist. The controller is configured to process output signals from the accelerometer to detect when the blood pressure pulse is propagated from the left ventricle of the user's heart, process a signal from the PPG or the pulse pressure sensor to detect when the blood pressure pulse arrives at the wrist, calculate a pulse transit time (PTT) for propagation of the blood pressure pulse from the left ventricle to the wrist, and generate one or more blood pressure values for the user based on the PTT.

公开(公告)号：US20170281024A1

公开(公告)日：2017-10-05

申请号：US15507607

申请日：2015-09-08

Applicant: Apple, Inc.

Inventor： Ravi Narasimhan ,  Richard C. Kimoto ,  Thomas J. Sullivan ,  Todd K. Whitehurst ,  Derek Park-shing Young ,  Zijing Zeng ,  Erno Klaassen

IPC: A61B5/021 ,  A61B5/00

CPC classification number: A61B5/02125 ,  A61B5/024 ,  A61B5/02416 ,  A61B5/11 ,  A61B5/1102 ,  A61B5/681 ,  A61B5/6824

Abstract: Wrist-worn devices and related methods measure a pulse transit time non-invasively and calculate a blood pressure value using the pulse transit time. A wrist-worn device includes an accelerometer, a photo-plethysmogram (PPG) or a pulse pressure sensor, and a controller. The PPG or the pulse pressure sensor coupled to the wrist-worn device for detecting an arrival of a blood pressure pulse at the user's wrist. The controller is configured to process output signals from the accelerometer to detect when the blood pressure pulse is propagated from the left ventricle of the user's heart, process a signal from the PPG or the pulse pressure sensor to detect when the blood pressure pulse arrives at the wrist, calculate a pulse transit time (PTT) for propagation of the blood pressure pulse from the left ventricle to the wrist, and generate one or more blood pressure values for the user based on the PTT.