METHOD FOR MEASURING CENTRAL VENOUS PRESSURE OR RESPIRATORY EFFORT

• US 20100145201A1
• Filed: 02/18/2010
• Published: 06/10/2010
• Est. Priority Date: 06/14/2006
• Status: Active Grant

• Current Assignee: Watermark Medical, Inc. (BioSerenity SAS)
• Original Assignee: Advanced Brain Monitoring
• Inventors: Popovic, Djordje, Berka, Chris, Zavora, Timothy, Levendowski, Daniel J., Westbrook, Philip R., Cvetinovic, Milenko
• Granted Patent: US 8,721,555 B2
• Time in Patent Office: Days
• US Class Current: 600/484
• CPC Class Codes: A61B 5/0205 Simultaneously evaluating both cardiovascular conditions and different types of body conditions, e.g. heart and respiratory condition
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: A61B 5/02125 of pulse wave propagation time
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/037 Measuring oesophageal pressure
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/1073 Measuring volume, e.g. of limbs
• CPC Class Codes: A61B 5/1135 by monitoring thoracic expansion
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/412 Detecting or monitoring sepsis
• CPC Class Codes: A61B 5/4818 Sleep apnoea

Abstract

Photoplethysmography (PPG) is obtained using one red (e.g., 660 nm) and one infrared (e.g., 880 to 940 nm) light emitting diode with a single photo diode in combination with a pressure transducer thereby allowing both CVP and SpO2 to be measured simultaneously. The system also includes sensors capable of measuring position, angle and/or movement of the sensor or patient. Once the PPG signal is acquired, high pass adaptive and/or notch filtering can be used with one element of the filter from the red and infrared signals used to measure the arterial changes needed to compute SpO2 and the other element of the signal can be used to measure CVP changes.

Claims

1. A system for monitoring respiratory effort/central venous pressure, the system comprising:

one or more sensor devices configured to acquire signals associated with physiological information of a patient including acquisition of photoplethysmography;

an acquisition signal processing quantification module to receive the signals from the one or more sensor devices and to perform signal processing and quantification/analysis to acquire central venous pressure signal or to acquire information from the received signals and transform the received signal to extract discrete central venous pressure information for a specific application.