Invention Grant
- Patent Title: Electrical coupling of pulse transit time (PTT) measurement system to heart for blood pressure measurement
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Application No.: US15681024Application Date: 2017-08-18
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Publication No.: US10779738B2Publication Date: 2020-09-22
- Inventor: Thomas J. Sullivan , Wren Nancy Dougherty , Richard C. Kimoto , Erno Klaassen , Ravi Narasimhan , Stephen J. Waydo , Todd K. Whitehurst , Derek Park-Shing Young , Santiago Quijano , Zijing Zeng
- Applicant: Apple Inc.
- Agency: Kilpatrick Townsend & Stockton LLP
- Main IPC: A61B5/021
- IPC: A61B5/021 ; A61B5/0408 ; A61B5/1455 ; A61B5/00 ; A61B5/024 ; A61B5/053

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 include a wrist-worn elongate band, at least four EKG or ICG electrodes coupled to the wrist-worn device for detecting a ventricular ejection of a heart, a photo-plethysmogram (PPG) sensor coupled to the wrist-worn device for detecting arrival of a blood pressure pulse at the user's wrist, and a controller configured to calculate a pulse transit time (PTT) for the blood pressure pulse. The controller calculates one or more blood pressure values for the user based on the PTT.
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