Electrical coupling of pulse transit time (PTT) measurement system to heart for blood pressure measurement

US10779738B2 · kind B2 · utility

Inventors

• Thomas J. Sullivan · Cupertino, US
• Wren N. Dougherty · San Francisco, US
• Richard C. Kimoto · Cupertino, US
• Erno H. Klaassen · Santa Clara, US
• Ravi Narasimhan · Los Altos, US
• Stephen J. Waydo · Campbell, US
• Todd K. Whitehurst · Santa Clarita, US
• Derek Park-Shing Young · Cupertino, US
• Santiago Quijano · San Jose, US
• Zijing Zeng · Cupertino, US

Key dates

• Filing date: Aug 18, 2017
• Grant date: Sep 22, 2020
• Expiry date: Apr 2, 2038

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/053
• WIPO field: Medical technology
• WIPO sector: Instruments

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.