System and method for a non-invasive medical sensor

• US 20080281174A1
• Filed: 06/15/2007
• Published: 11/13/2008
• Est. Priority Date: 06/16/2006
• Status: Active Grant

• Current Assignee: Biointellisense, Inc.
• Original Assignee: Medtor, LLC
• Inventors: Dietiker, Thomas
• Granted Patent: US 8,271,063 B2
• Time in Patent Office: Days
• US Class Current: 600/336
• CPC Class Codes: A61B 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/1495 Calibrating or testing of in-vivo probes
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6833 Adhesive patches
• CPC Class Codes: A61B 5/6838 Clamps or clips
• CPC Class Codes: A61B 5/7289 Retrospective gating, i.e. associating measured signals or images with a physiological event after the actual measurement or image acquisition, e.g. by simultaneously recording an additional physiological signal during the measurement or image acquisition

Abstract

A sensor is disclosed having one or more light sources, and one or more light detectors. At least one of the detectors produces an output in response to received light. Also, electrical circuitry in response to the output generates a pulse waveform proportional to the arterial and venous pulse of a human body, wherein the pulse waveform is used to synchronize an arterial-pulse measurement of the absorption or reflectance of one or more coherent light sources.

Claims

1. An apparatus comprising:

a sensor having one or more coherent light sources, one broadband light source and one or more wavelength detectors wherein the sensors and detectors are mounted opposite each other, and at least one of the detectors produces an output indicating the centroid wavelength of received light.

2. The apparatus of claim 1, wherein the apparatus is placed on a finger or other extremity of the human body and shines light from the one or more light sources through the extremity.

3. The apparatus of claim 1, wherein the sensor reflects light off skin from any part of the human body.

4. The apparatus of claim 1, wherein at least one of the one or more wavelength detectors is a dual photodiode or other type that produces the output indicating a centroid wavelength of received light.

5. The apparatus of claim 1, wherein at least one of the one or more light sources emits light of a wide light spectrum from 200 nm to 2000 nm or any portion thereof.

6. The apparatus of claim 5, wherein the least one of the one or more light sources emits light of a wide light spectrum is a white LED or any other broad emission device.

7. The apparatus of claim 1, wherein the sensor is connected to a processing system that drives the light sources, including the broad emission device and also receives signals from photodiodes and the wavelength detector.

8. The apparatus of claim 7, wherein the processing system includes computer media, memory, and signal processing circuitry to calculate various parameters of a blood stream through comparison of the signals received by the photodiodes.

9. The apparatus of claim 8, wherein the processing system illuminates the tissue with light generated from the broad emission light source.

10. The apparatus of claim 9, wherein the wavelength detector generates a signal proportional to a strongest transmission wavelength of the light emitted from the broad emission light source, after it either passed through a body part or is reflected off of skin of a human.

11. The apparatus of claim 10, wherein the signal derived from the wavelength detector is processed by circuitry and computer processing to obtain a pulse waveform proportional to the arterial and venous pulse of the human body.

12. The apparatus of claim 11, wherein the time domain and amplitude properties of both the arterial and venous pulse are stored and further used to synchronize an arterial-pulse synchronized measurement of the absorption or reflectance of the one or more coherent light-sources through a portion of the human body.

13. The apparatus of claim 12, wherein the arterial and venous pulse are used to calculate oxygen-saturation, carbon-monoxide concentration or any other parameter of the blood.

14. The apparatus of claim 13, wherein the arterial and venous pulse coinciding wavelength detector signals are used to reduce or eliminate false pulses commonly caused by motion of the portion of the human body.

15. A method comprising the steps of:

emitting light from one or more coherent light sources;

emitting light from at least one broadband light source;

receiving incident light radiation from at least one of the emitted lights; and

, producing an output indicating the centroid wavelength of the received incident light radiation.

16. The method of claim 15 further comprising the step of shining the emitted light through at least a portion of a human body.

17. The method of claim 15 further comprising the step of reflecting the emitted light of off skin from a portion of a human body.

18. The method of claim 15 wherein the step of emitting light from coherent light sources includes the step of generating light in a wide light spectrum from 200 nm to 2000 nm or any portion thereof.

19. The method of claim 15 wherein the step of emitting light from the broadband includes the step of generating light from a white LED or any other broad emission device.

20. The method of claim 15 further comprising the step of generating a signal proportional to a strongest transmission wavelength of the light emitted from the broad emission light source, after it either passed through a body part or is reflected off of skin of a human.

21. The method of claim 20 further comprising the step of processing the signal derived from the wavelength detector to obtain a pulse waveform proportional to the arterial and venous pulse of the human body.

22. The method of claim 21 further comprising the steps of storing the time domain and amplitude properties of both the arterial and venous pulse and synchronizing, by using the stored properties, an arterial-pulse synchronized measurement of the absorption or reflectance of the one or more coherent light-sources through a portion of the human body.

23. The method of claim 22 further comprising the steps of calculating oxygen-saturation, carbon-monoxide concentration or any other parameter of the blood by using the arterial and venous pulse.