Hypersaturation index
First Claim
1. A method of providing an indication of an oxygenation of blood of a non-invasively monitored patient different from oxygen saturation, wherein said oxygen saturation is a measure of a percentage of available carriers in the blood that are bound to oxygen molecules at a time of measurement acquisition, the method comprising:
- using an electronic light source including one or more light emitters, emitting at least a plurality of wavelengths of light into a portion of a body of the patient;
using an electronic light detector, detecting the light after attenuation of the body, said attenuation responsive to said oxygenation of said blood, and outputting one or more signals from said light detector, said one or more signals responsive to said attenuation;
processing said one or more signals using one or more signal processors to electronically;
calculate a first index responsive to said percentage of said carriers bound to oxygen, said first index being said measure of said oxygen saturation, andcalculate a second index responsive to a quantity of oxygen dissolved in the blood of a patient and not bound to any of said carriers while the patient is in a hyperoxic state, said second index providing different information to a caregiver than said first index, wherein said second index is calculated based on a ratio of information from at least a first of the plurality of wavelengths and information from at least a second of the plurality of wavelengths during the hyperoxic state of the patient; and
electronically displaying at least a value responsive to said second index.
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Accused Products
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.
952 Citations
19 Claims
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1. A method of providing an indication of an oxygenation of blood of a non-invasively monitored patient different from oxygen saturation, wherein said oxygen saturation is a measure of a percentage of available carriers in the blood that are bound to oxygen molecules at a time of measurement acquisition, the method comprising:
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using an electronic light source including one or more light emitters, emitting at least a plurality of wavelengths of light into a portion of a body of the patient; using an electronic light detector, detecting the light after attenuation of the body, said attenuation responsive to said oxygenation of said blood, and outputting one or more signals from said light detector, said one or more signals responsive to said attenuation; processing said one or more signals using one or more signal processors to electronically; calculate a first index responsive to said percentage of said carriers bound to oxygen, said first index being said measure of said oxygen saturation, and calculate a second index responsive to a quantity of oxygen dissolved in the blood of a patient and not bound to any of said carriers while the patient is in a hyperoxic state, said second index providing different information to a caregiver than said first index, wherein said second index is calculated based on a ratio of information from at least a first of the plurality of wavelengths and information from at least a second of the plurality of wavelengths during the hyperoxic state of the patient; and electronically displaying at least a value responsive to said second index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A system for determining an estimate of an oxygen saturation of a patient and an additional estimate of a non-invasively measured oxygen reserve of said patient, said oxygen saturation being a measure of a percentage of available carriers in blood that are bound to oxygen molecules at a time of measurement acquisition and said oxygen reserve being oxygen dissolved in the blood of a patient during a hyperoxic state of the patient and different from an amount of dissolved oxygen corresponding to said estimate of said oxygen saturation, the system comprising:
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an input of an electronic physiological monitor, said input configured to receive one or more signals responsive to light of at least a plurality of wavelengths attenuated by body tissue of the patient, said one or more signals output from a light detector configured to detect said attenuated light; one or more physiological hardware processors of said electronic physiological monitor, the one or more processors configured to electronically; calculate a first index responsive to said percentage of said carriers bound to oxygen, said first index being said measure of said oxygen saturation, and calculate a second index responsive to said dissolved oxygen, wherein said second index is responsive to a ratiometric calculation, said ratiometric calculation including a denominator responsive to portions of said one or more signals that were responsive to at least one of said plurality of wavelengths during the hyperoxic state of the patient and a numerator responsive to portions of said one or more signals that were responsive to at least another of said plurality of wavelengths during the hyperoxic state of the patient; and a display electronically providing at least a visual indicia of said second index. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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Specification