Device and method for obtaining vital sign information of a living being

• US 10,178,958 B2
• Filed: 12/02/2013
• Issued: 01/15/2019
• Est. Priority Date: 12/04/2012
• Status: Active Grant

• Current Assignee: Koninklijke Philips N.V.
• Original Assignee: Koninklijke Philips N.V.
• Inventors: Kaestle, Siegfried Walter, Shan, Caifeng
• Primary Examiner(s): Chen, Tse W
• Assistant Examiner(s): SUNWOO, NATE S
• Application Number:
  US14/093,566
• Publication Number:
  US 20140155759A1
• Time in Patent Office: 1,870 Days
• Field of Search: None
• CPC Class Codes: A61B 2503/045 Newborns, e.g. premature baby monitoring
• CPC Class Codes: A61B 2505/03 Intensive care
• CPC Class Codes: A61B 5/0077 Devices for viewing the surface of the body, e.g. camera, magnifying lens
• CPC Class Codes: A61B 5/02416 using photoplethysmograph signals, e.g. generated by infrared radiation A61B5/14552 takes precedence
• CPC Class Codes: A61B 5/02427 Details of sensor
• CPC Class Codes: A61B 5/1128 using image analysis A61B5/1127 takes precedence
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• 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: A61F 7/007 characterised by electric heating
• CPC Class Codes: A61G 11/00 Baby-incubators; Couveuses

Abstract

A device for obtaining vital sign information of a living being comprises a detection unit that receives light in at least one wavelength interval reflected from at least a region of interest of a living being and that generates an input signal from the received light. A processing unit processes the input signal and derives vital sign information of the living being from the input signal by use of remote photoplethysmography. An illumination unit illuminates at least the region of interest with light, and a control unit controls the illumination unit based on the input signal and/or the derived vital sign information.

Claims

1. A device for obtaining vital sign information of a living being, comprising:

a detector that receives light in at least one wavelength interval reflected from at least a region of interest of a living being and that generates an input signal from the received light,

an illuminator that illuminates at least said region of interest with light, and

a processor that processes the input signal and derives vital sign information of said living being from said input signal by use of remote photoplethysmography and that controls said illuminator based on said input signal and/or said derived vital sign information,

wherein said control of said illuminator comprises one or more changes to one or more parameters of the illuminator, the one or more parameters of the illuminator comprising intensity, wavelength, direction, and/or illumination angle of the light emitted by said illuminator.

2. The device as claimed in claim 1, wherein said illuminator comprises two or more illuminators.

3. The device as claimed in claim 2, wherein said two or more illuminators are arranged at different locations and/or with different orientations.

4. The device as claimed in claim 2, wherein said two or more illuminators have different parameters, in particular different wavelengths, intensities, and/or illumination angles.

5. The device as claimed in claim 3 or 4, wherein said processor is configured to individually control said two or more illuminators.

6. The device as claimed in claim 1, wherein said processor is configured to determine the amount of specular reflection in the region of interest and wherein the change of the one or more parameters of said illuminator is based on the determined amount of specular reflection so as to reduce or minimize the amount of specular reflection.

7. The device as claimed in claim 1, wherein said control of said illuminator further comprises one or more changes to one or more parameters of a monitored area and/or the derived vital sign information, in particular light intensity of the monitored area, heart rate, oxygen saturation, pulsatility amplitude, pulse shape, and/or periodicity of the vital sign information.

8. The device as claimed in claim 1, wherein said detector comprises two or more detectors.

9. The device as claimed in claim 8, wherein said processor is configured to select the input signals generated from light received by the detectors from which vital sign information with the best quality are used for deriving the vital sign information.

10. The device as claimed in claim 8, wherein said processor is configured to select the input signals generated from light received by the detector which received light from the region of interest with the best illumination.

11. The device as claimed in claim 1, wherein said detector is configured to detect changes of a monitored area, the environment, and/or the living being and wherein said processor is configured, if changes of the monitored area, the environment, and/or the living being are detected, to check the one or more parameters of said illuminator and to again change the one or more parameters of said illuminator based on said input signal and/or said derived vital sign information.

12. The device as claimed in claim 1, wherein said control of said illuminator further comprises one or more changes to the one or more parameters of the illuminator to sequentially illuminate said region of interest with different settings of intensity, wavelength, direction, and/or illumination angle of light and to select the settings resulting in input signals with the best image quality and/or vital signs with the best quality.