Photoplethysmographic device with species-specific calibration

• US 20070255124A1
• Filed: 04/27/2006
• Published: 11/01/2007
• Est. Priority Date: 04/27/2006
• Status: Active Grant

• Current Assignee: Kestrel Labs, Inc.
• Original Assignee: Kestrel Labs, Inc.
• Inventors: Aronow, Kurt, Pologe, Jonas
• Granted Patent: US 7,430,444 B2
• Time in Patent Office: Days
• US Class Current: 600/331
• 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;

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 a calibration;

the calibration designed for at least one non-human species.

2. The apparatus of claim 1 containing two or more calibrations for use on two or more non-human species.

3. The apparatus of claim 2 in which one of the two or more calibrations is selected as an active calibration through a user interface.

4. The apparatus of claim 2 in which one of the two or more calibrations is automatically selected as an active calibration by the sensor.

5. 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.

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

directing light into a tissue-under-test;

detecting photoplethysmographic signals exiting from a tissue-under-test and converting 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 a calibration designed for at least one a non-human species.

7. The method of claim 6 having two or more of the calibrations for two or more non-human species.

8. The method of claim 7 having an active calibration selected from the two or more calibrations through a user interface.

9. The method of claim 7 having an active calibration selected from the two or more calibrations by the sensor.

10. 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.