Method for spectrophotometric blood oxygenation monitoring
First Claim
1. A method for non-invasively determining a blood oxygen saturation level of the microvasculature within a subject'"'"'s tissue, comprising the steps of:
- providing a spectrophotometric sensor operable to transmit light into the subject'"'"'s tissue, and to sense the light;
detecting light after passage through the subject'"'"'s tissue using the sensor, and producing initial signal data from the light sensed;
calibrating the sensor to that particular subject using the initial signal data, thereby accounting for the specific physical characteristics of the particular subject'"'"'s tissue being sensed; and
subsequent to calibrating the sensor,using the calibrated sensor to determine the blood oxygen saturation level within the subject'"'"'s tissue.
11 Assignments
0 Petitions
Accused Products
Abstract
According to the present invention, a method and apparatus for non-invasively determining the blood oxygen saturation level within a subject'"'"'s tissue is provided. The method comprises the steps of: 1) providing a near infrared spectrophotometric sensor operable to transmit light along a plurality of wavelengths into the subject'"'"'s tissue; 2) sensing the light transmitted into the subject'"'"'s tissue using the sensor, and producing signal data representative of the light sensed from the subject'"'"'s tissue; 3) processing the signal data to account for physical characteristics of the subject; and 4) determining the blood oxygen saturation level within the subject'"'"'s tissue using a difference in attenuation between the wavelengths. The apparatus includes a sensor having a light source and at least one light detector, which sensor is operably connected to a processor. The sensor is operable to transmit light along a plurality of wavelengths into the subject'"'"'s tissue, and produce signal data representative of the light sensed from the subject'"'"'s tissue. The algorithm is operable to process the signal data to account for the physical characteristics of the subject being sensed.
51 Citations
16 Claims
-
1. A method for non-invasively determining a blood oxygen saturation level of the microvasculature within a subject'"'"'s tissue, comprising the steps of:
-
providing a spectrophotometric sensor operable to transmit light into the subject'"'"'s tissue, and to sense the light; detecting light after passage through the subject'"'"'s tissue using the sensor, and producing initial signal data from the light sensed; calibrating the sensor to that particular subject using the initial signal data, thereby accounting for the specific physical characteristics of the particular subject'"'"'s tissue being sensed; and subsequent to calibrating the sensor, using the calibrated sensor to determine the blood oxygen saturation level within the subject'"'"'s tissue. - View Dependent Claims (2, 3, 4)
-
-
5. A method for non-invasively determining a blood oxygen saturation level of the microcirculation within a subject'"'"'s tissue using a spectrophotometric sensor operable to transmit light into the subject'"'"'s tissue, and to sense the light, the method comprising the steps of:
-
sensing the subject'"'"'s tissue using the sensor, and producing initial signal data there from, which signal data is attributable to non-pulsatile blood flow within the microcirculation of the subject'"'"'s tissue; calibrating the sensor to that particular subject using the initial signal data, thereby accounting for the specific physical characteristics of the particular subject'"'"'s tissue being sensed; and subsequent to calibrating the sensor, determining the blood oxygen saturation level within the subject'"'"'s tissue using the calibrated sensor. - View Dependent Claims (6, 7, 8, 9)
-
-
10. A method for non-invasively determining a hemoglobin concentration level of the microcirculation within a subject'"'"'s tissue, comprising the steps of:
-
providing a spectrophotometric sensor operable to transmit light into the subject'"'"'s tissue, and to sense the light; sensing the subject'"'"'s tissue using the sensor, and producing initial signal data from the sensing, which initial signal data is attributable to non-pulsatile blood flow within the microcirculation of the subject'"'"'s tissue; and calibrating the sensor to that particular subject using the initial signal data, thereby accounting for the specific physical characteristics of the particular subject'"'"'s tissue being sensed; and subsequent to calibrating the sensor, determining the concentration of at least one of oxyhemoglobin and deoxyhemoglobin of the microvasculature within the subject'"'"'s tissue using the calibrated sensor. - View Dependent Claims (11)
-
-
12. An apparatus for non-invasively determining a blood oxygen saturation level of the microcirculation within a subject'"'"'s tissue, comprising:
-
at least one spectrophotometric sensor having at least one light source and at least one light detector, wherein the light source is operable to transmit light along a plurality of wavelengths into the subject'"'"'s tissue, and the light detector is operable to detect light from the light source after the light has traveled through the subject'"'"'s tissue, and the sensor is operable to produce signal data attributable to non-pulsatile blood flow within the microcirculation of the subject'"'"'s tissue from the detected light; and a processor operably connected to the at least one sensor, wherein the processor is adapted to sense the subject'"'"'s tissue using the sensor, and produce initial signal data from the sensing, which initial signal data is attributable to non-pulsatile blood flow within the microcirculation of the subject'"'"'s tissue, and to calibrate the sensor to that particular subject using the initial signal data, thereby accounting for the specific physical characteristics of the particular subject'"'"'s tissue being sensed, and subsequent to calibrating the sensor, determine the concentration of the blood oxygen saturation level of the microvasculature within the subject'"'"'s tissue using the calibrated sensor. - View Dependent Claims (13, 14, 15, 16)
-
Specification