Photoplethysmographic device with species-specific calibration

• US 7,430,444 B2
• Filed: 04/27/2006
• Issued: 09/30/2008
• Est. Priority Date: 04/27/2006
• Status: Active Grant

• Current Assignee: Kestrel Labs, Inc.
• Original Assignee: Kestrel Labs, Inc.
• Inventors: Aronow, Kurt Albert, Pologe, Jonas Alexander
• Primary Examiner(s): Winakur; Eric F
• Assistant Examiner(s): Berhanu; Etsub D
• Application Number:
  US11/412,013
• Publication Number:
  US 20070255124A1
• Time in Patent Office: 887 Days
• Field of Search: 600/300, 600/309, 600/310, 600/322, 600/323, 600/331
• US Class Current: 600/322
• CPC Class Codes: A61B 2503/40 Animals
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: A61B 5/7475 User input or interface means, e.g. keyboard, pointing device, joystick

Abstract

A method and apparatus for photoplethysmographic measurements from non-human species is disclosed. The extinction of light by hemoglobin, as a function of wavelength, varies as a function of the species of the subject being monitored. The calibration of a photoplethysmographic device should therefore also vary dependant upon the species of the subject. The photoplethysmographic device of this invention includes calibrations specifically designed to provide accurate readings on non-human subjects.

Claims

1. A photoplethysmographic measurement apparatus for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising:

one or more emitters generating light incident on a tissue-under-test;

a detector that receives photoplethysmographic signals from a tissue-under-test and converts the received photoplethysmographic signals to electronic signals indicative of the received photoplethysmographic signals;

two or more calibrations, each of the calibrations designed for use on a different non-human species;

a user interface for selection of an active calibration chosen from the two or more calibrations;

signal processing circuitry which converts the electronic signals into the one or more blood analyte levels or the one or more hemodynamic parameters in accordance with the active calibration.

2. A photoplethysmographic measurement apparatus for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising:

one or more emitters generating light incident on a tissue-under-test;

a detector that receives photoplethysmographic signals from a tissue-under-test and converts the received photoplethysmographic signals to electronic signals indicative of the received photoplethysmographic signals;

signal processing circuitry which converts the electronic signals into the one or more blood analyte levels or the one or more hemodynamic parameters in accordance with an active calibration selected from two or more calibrations designed for use on two or more non-human species;

a user interface which provides an interface for selection of the active calibration.

3. A method for photoplethysmographic measurement for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising the steps of:

providing two or more calibrations, each of the calibrations designed for a different non-human species;

directing light into a tissue-under-test;

detecting photoplethysmographic signals exiting from a tissue-under-test and convening the detected photoplethysmographic signals to electronic signals indicative of the detected photoplethysmographic signals;

converting the electronic signals into the one or more blood analyte levels or the one or more hemodynamic parameters in accordance with an active calibration;

selecting the active calibration through the use of a user interface from the two or more calibrations.

4. A method for photoplethysmographic measurement for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising the steps of:

directing light into a tissue-under-test;

detecting photoplethysmographic signals from a tissue-under-test and converting the detected photoplethysmographic signals to electronic signals indicative of the detected photoplethysmographic signals;

selecting an active calibration through the use of a user interface;

converting the electronic signals into the one or more blood analyte levels or the one or more hemodynamic parameters in accordance with the active calibration designed for one or more non-human species.