Systems and methods for determining physiological characteristics of a patient using pulse oximetry

• US 10,219,751 B2
• Filed: 01/21/2015
• Issued: 03/05/2019
• Est. Priority Date: 05/17/2011
• Status: Active Grant

• Current Assignee: LionsGate Technologies, Inc.
• Original Assignee: LionsGate Technologies, Inc.
• Inventors: Petersen, Christian Leth, Ansermino, John Mark, Dumont, Guy
• Primary Examiner(s): Winakur, Eric
• Application Number:
  US14/602,165
• Publication Number:
  US 20150133756A1
• Time in Patent Office: 1,504 Days
• CPC Class Codes: A61B 2560/045 with a separable interface unit, e.g. for communication
• CPC Class Codes: A61B 2562/227 Sensors with electrical connectors
• CPC Class Codes: A61B 5/0004 characterised by the type of physiological signal transmitted
• CPC Class Codes: A61B 5/0015 characterised by features of the telemetry system
• 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 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/02433 for infrared radiation
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6898 Portable consumer electronic devices, e.g. music players, telephones, tablet computers
• CPC Class Codes: A61B 5/7228 Signal modulation applied to the input signal sent to patient or subject; demodulation to recover the physiological signal modulation H03C
• CPC Class Codes: A61B 5/7278 Artificial waveform generation or derivation, e.g. synthesising signals from measured signals A61B5/327 takes precedence
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B

Abstract

Methods, systems and related apparatus are provided to enable an electronic device to operate an external sensor comprising one or more emitters for emitting electromagnetic radiation of two different wavelengths and a detector for generating a response signal based on received electromagnetic radiation of the two different wavelengths connectable to an audio interface by applying a harmonic driving signal to a first contact and a second contact of the audio interface for driving the emitters of the external sensor, receiving the response signal at a third contact of the audio interface, demodulating and demultiplexing the response signal into a first wavelength response signal and a second wavelength response signal, analyzing the first and second wavelength response signals to determine one or more vital signs, and outputting the determined one or more vital signs.

Claims

1. A method for generating a driving signal for an oximeter sensor comprising a red LED and an infrared LED connected in parallel with opposing polarities, the method comprising:

providing a base harmonic signal having a base amplitude less than an activation voltage of the red and infrared LEDs; and

selectively providing periodic positive and negative triggering peaks in the base harmonic signal, the positive and negative triggering peaks having amplitudes greater than the activation voltage of the red and infrared LEDs,

providing the base harmonic signal, including the positive and negative triggering peaks to the red LED and the infrared LED of the oximeter sensor,

wherein the one of the positive polarity triggering peaks and negative polarity triggering peaks for triggering the infrared LED have a lower amplitude than the other one of the positive polarity triggering peaks and negative polarity triggering peaks for triggering the red LED.