Vital sign monitor for measuring blood pressure using optical, electrical and pressure waveforms

US8419649B2 · kind B2 · utility

Assignee

• SOTERA WIRELESS, INC. · US

Inventors

• Matthew Banet · Del Mar, US
• Zhou Zhou · San Diego, US
• Marshal Dhillon · San Diego, US
• Robert James Kopotic · Jamul, US
• Andrew Terry · San Jose, US
• Henk Visser · San Diego, US

Key dates

• Filing date: Jun 12, 2008
• Grant date: Apr 16, 2013
• Expiry date: Aug 16, 2031

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B5/7239
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method and apparatus for continuous measurement of blood pressure, based on pulse transit time, which does not require any external calibration. This technique, referred to herein as the ‘composite technique’, is carried out with a body-won sensor that measures blood pressure and other vital signs, and wirelessly transmits them to a remote monitor. A network of disposable sensors, typically placed on the patient's right arm and chest, connect to the body sensor and measure a time-dependent electrical waveform, optical waveform, and pressure waveform. The disposable sensors typically include an armband that features an inflatable bladder coupled to a pressure sensor, at least 3 electrical sensors (e.g. electrodes), and an optical sensor (e.g., a light source and photodiode) attached to a wrist-worn band.