HYPERSATURATION INDEX

• US 20160000362A1
• Filed: 09/11/2015
• Published: 01/07/2016
• Est. Priority Date: 04/17/2012
• Status: Active Grant

• Current Assignee: Masimo Corporation
• Original Assignee: Masimo Corporation
• Inventors: Diab, Mohamed K., Iyengar, Prashanth, Sampath, Anand, Al-Ali, Ammar
• Granted Patent: US 9,775,546 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 2562/0238 Optical sensor arrangements for performing transmission measurements on body tissue
• 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 5/14551 for measuring blood gases
• CPC Class Codes: A61B 5/14552 Details of sensors specially adapted therefor
• CPC Class Codes: A61B 5/6826 Finger
• 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: A61B 5/7405 using sound
• CPC Class Codes: A61B 5/743 Displaying an image simultaneously with additional graphical information, e.g. symbols, charts, function plots
• CPC Class Codes: A61B 5/746 Alarms related to a physiological condition, e.g. details of setting alarm thresholds or avoiding false alarms alarms per se G08B
• CPC Class Codes: A61M 2230/205 partial oxygen pressure (P-O2)

Abstract

Embodiments of the present disclosure provide a hypersaturation index for measuring a patient'"'"'s absorption of oxygen in the blood stream after a patient has reached 100% oxygen saturation. This hypersaturation index provides an indication of the partial pressure of oxygen of a patient. In an embodiment of the present invention, a hypersaturation index is calculated based on the absorption ratio of two different wavelengths of energy at a measuring site. In an embodiment of the invention, a maximum hypersaturation index threshold is determined such that an alarm is triggered when the hypersaturation index reaches or exceeds the threshold. In another embodiment, an alarm is triggered when the hypersaturation index reaches or falls below its starting point when it was first calculated.

Claims

1. A method of measuring a quantity of oxygen dissolved in blood of a patient, the method comprising:

emitting light of at least a first and second wavelength of light from a light emitter into a portion of a body of the patient;

detecting the light after attenuation of the body, wherein the detected attenuation of the light is indicative of a physiological condition of the body of the patient;

using the detected measures of the attenuations of the first and second wavelengths of light to determine a measure of a quantity of oxygen dissolved in the blood of a patient, where the measure indicates increasing dissolved oxygen in the blood above a 100% oxygen saturation condition of the patient; and

displaying, using a displayed measurement separate from any oxygen saturation measurements, an indication the measure of the quantity of oxygen dissolved in the blood of the patient.

2. The method of claim 1, wherein the displayed measurement is an oxygen hypersaturation index.

3. The method of claim 2, wherein the hypersaturation index is an indication of the partial pressure of oxygen.

4. The method of claim 2, wherein the displayed measurement is a graph of the oxygen hypersaturation index.

5. The method of claim 1, wherein the displaying the indication of the measure of the quantity of oxygen dissolved in the blood of the patient comprises generating an alarm in response to the indication exceeding a threshold.

6. A system for determining an amount of oxygen reserves in the body of a patient after a patient'"'"'s hemoglobin is fully saturated with oxygen, the system comprising:

at least one light emitter emitting light of at least a first and second wavelength of light into the body of the patient;

a light detector detecting the light after attenuation of the body, wherein the detected attenuation of the light is indicative of a physiological condition of the body of the patient and providing a signal indicative of the detected light;

a physiological hardware processor configured to receive and determine measures of the attenuation of the light of the at least first and second wavelengths of light;

wherein, the processor is further configured to use the measures of the attenuations of the first and second wavelengths of light to determine an indication of a quantity of oxygen dissolved in the blood of the patient above a 100% oxygen saturation condition of the patient; and

a display which displays the indication, wherein the displayed indication is separate from any displayed oxygen saturation measurements.

7. The system of claim 6, wherein the indication is an oxygen hypersaturation index.

8. The system of claim 7, wherein the hypersaturation index is an indication of the partial pressure of oxygen.

9. The system of claim 7, wherein the displaying of the indication comprises displaying a graph of an oxygen hypersaturation index.

10. The system of claim 6, further comprising an alarm configured to generate an alarm indication in response to the indication exceeding a threshold.