OPTIMIZED GAS SUPPLY USING PHOTOPLETHYSMOGRAPHY

• US 20070027375A1
• Filed: 09/26/2006
• Published: 02/01/2007
• Est. Priority Date: 06/20/2002
• Status: Active Grant

• Current Assignee: Beta Biomed Services, Inc., University of Florida Research Foundation, Incorporated (State University System of Florida)
• Original Assignee: University of Florida Research Foundation, Incorporated (State University System of Florida)
• Inventors: Fuehrlein, Brian, Melker, Richard
• Granted Patent: US 8,755,857 B2
• Time in Patent Office: Days
• US Class Current: 600/340
• CPC Class Codes: A61B 2560/0276 Determining malfunction
• CPC Class Codes: A61B 2562/247 Hygienic covers, i.e. for covering the sensor or apparatus during use
• 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 5/02427 Details of sensor
• CPC Class Codes: A61B 5/0261 using optical means, e.g. infrared light
• CPC Class Codes: A61B 5/0295 using plethysmography, i.e. measuring the variations in the volume of a body part as modified by the circulation of blood therethrough, e.g. impedance plethysmography
• CPC Class Codes: A61B 5/036 by means introduced into body tracts A61B5/032 and A61B5/035 take precedence
• CPC Class Codes: A61B 5/0816 Measuring devices for examining respiratory frequency measuring frequency of electric signals G01R23/00
• CPC Class Codes: A61B 5/0836 Measuring rate of CO2 production
• CPC Class Codes: A61B 5/087 Measuring breath flow
• CPC Class Codes: A61B 5/0873 using optical means
• 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 5/4818 Sleep apnoea
• CPC Class Codes: A61B 5/4836 Diagnosis combined with treatment in closed-loop systems or methods A61B5/0036 takes precedence
• CPC Class Codes: A61B 5/6819 Nose
• CPC Class Codes: A61B 5/682 Mouth, e.g., oral cavity; tongue; Lips; Teeth
• CPC Class Codes: A61B 5/6826 Finger
• CPC Class Codes: A61B 5/6829 Foot or ankle
• 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 5/7282 : Event detection, e.g. detecting unique waveforms indicative of a medical condition A61B5/4094, A61B5/4818, A61B5/349, A61B5/0823 take precedence
• CPC Class Codes: A61M 16/0003 : Accessories therefor, e.g. sensors, vibrators, negative pressure
• CPC Class Codes: A61M 16/0051 : with alarm devices
• CPC Class Codes: A61M 16/0057 : Pumps therefor
• CPC Class Codes: A61M 16/021 : operated by electrical means A61M16/202 – A61M16/205 take precedence
• CPC Class Codes: A61M 16/0666 : Nasal cannulas or tubing devices for improving normal breathing through the nose A61F5/08; nose filters A62B23/06; outside holding devices A61M25/02
• CPC Class Codes: A61M 16/0672 : Nasal cannula assemblies for oxygen therapy
• CPC Class Codes: A61M 16/08 : Bellows; Connecting tubes having means for taking samples G01N1/22; Water traps; Patient circuits
• CPC Class Codes: A61M 16/085 : Gas sampling
• CPC Class Codes: A61M 16/20 : Valves specially adapted to medical respiratory devices
• CPC Class Codes: A61M 2202/0007 : introduced into the body
• CPC Class Codes: A61M 2202/0208 : Oxygen
• CPC Class Codes: A61M 2202/03 : Gases in liquid phase, e.g. cryogenic liquids
• CPC Class Codes: A61M 2205/3561 : local, e.g. within room or hospital
• CPC Class Codes: A61M 2205/3569 : sublocal, e.g. between console and disposable
• CPC Class Codes: A61M 2210/0618 : Nose
• CPC Class Codes: A61M 2210/0625 : Mouth
• CPC Class Codes: A61M 2210/0662 : Ears
• CPC Class Codes: A61M 2230/005 : Parameter used as control input for the apparatus
• CPC Class Codes: A61M 2230/06 : Heartbeat rate only
• CPC Class Codes: A61M 2230/205 : partial oxygen pressure (P-O2)
• CPC Class Codes: A61M 2230/30 : Blood pressure A61M2230/04 takes precedence
• CPC Class Codes: A61M 2230/42 : Rate
• CPC Class Codes: A61M 2230/432 : partial CO2 pressure (P-CO2)

Abstract

The present invention relates to optimized gas supply utilizing photoplethysmography. Flow rate, pressure or amount of gas is adjusted as a function of blood oxygen saturation data, photoplethysmography signals, or both, obtained from the pulse oximeter probe.

Claims

1. A method of obtaining photoplethysmography readings or oxygen saturation readings, or both, from an individual, said method comprising:

obtaining a pulse oximeter probe comprising at least one LED and at least one photodetector;

securing said probe onto said individual'"'"'s right and/or left nasal alar, whereby tissue of said nasal alar rests between said at least one photodetector and said at least one LED; and

monitoring photoplethysmography or oxygen saturation signals generated by said probe responsive to blood flow at said tissue of said nasal alar.

2. A method of controlling flow of gas being supplied to an individual comprising:

providing a gas supply to said individual;

securing at least one pulse oximeter probe to at least one central source site of said individual, wherein said pulse oximeter probe generates pulse oximetry signals and/or photoplethysmography signals responsive to blood flow at said at least one central source site; and

adjusting flow rate, pressure, concentration and/or amount of said gas to said individual in response to said pulse oximetry signals and/or photoplethysmography signals.

3. The method of claim 2, wherein said gas comprises oxygen.

4. The method of claim 2, wherein said gas being supplied to an individual is supplied via a self-contained breathing apparatus.

5. The method of claim 4, wherein said self-contained breathing apparatus is being used by an emergency worker.

6. The method of claim 2, wherein said gas supply and said at least one pulse oximeter probe are combined.

7. The method of claim 2, wherein said gas supply is provided via mechanical ventilation.

8. The method of claim 2, wherein said gas supply is provided via PEEP, wherein said PEEP is optimized utilizing said pulse oximetry and/or photoplethysmography signals.

9. The method of claim 2, wherein said gas supply is provided via mechanical ventilation and PEEP.

10. The method of claim 8, wherein amplitude of said photoplethysmography signals is utilized to optimize PEEP.

11. The method of claim 8, wherein the envelope of said photoplethysmography signals is utilized to optimize PEEP.

12. A method of optimizing PEEP in an individual being supplied with gas comprising:

securing at least one pulse oximeter probe to at least one central source site of said individual, wherein said pulse oximeter probe generates photoplethysmography signals responsive to blood flow at said at least one central source site; and

adjusting PEEP being applied to said individual in response to said photoplethysmography signals.

13. The method of claim 12, wherein amplitude of said photoplethysmography signals is utilized to optimize PEEP.

14. The method of claim 12, wherein the envelope of said photoplethysmography signals is utilized to optimize PEEP.

15. The method of claim 12, wherein said gas is being supplied via mechanical ventilation.