Non-invasive measurement of blood oxygen saturation
First Claim
1. A method for non-invasive determination of oxygen saturation of central venous or mixed venous blood within a deep vascular structure of interest in a human patient that contains central venous or mixed venous blood, the method comprising:
- placing emitter and receiver elements of a light oximeter device on the patient'"'"'s skin in the vicinity of the deep vascular structure of interest wherein the deep vascular structure contains central venous or mixed venous blood, further wherein placement of said elements is achieved through matching of a plethysmography trace obtained from the oximeter device to known plethysmography characteristics of the deep vascular structure of interest; and
determining oxygen saturation of blood within the deep vascular structure of interest, wherein oxygen saturation is determined from a ratio of light absorbed at different wavelengths by haemoglobin in the blood within the deep vascular structure of interest.
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Abstract
The invention relates to a method for non-invasive determination of oxygen saturation of blood within a deep vascular structure of a human patient comprising locating on skin of the patient in a vicinity of the deep vascular structure of interest emitter and receiver elements of a light oximeter device, wherein optimal location of said elements is achieved through matching of a plethysmography trace obtained from the oximeter device to known plethysmography characteristics of the deep vascular structure of interest, and wherein oxygen saturation is determined from a ratio of light absorbed at different wavelengths by haemoglobin in the blood within the vascular structure of interest. The invention also relates to modified oximetry devices capable of carrying out the method.
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Citations
19 Claims
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1. A method for non-invasive determination of oxygen saturation of central venous or mixed venous blood within a deep vascular structure of interest in a human patient that contains central venous or mixed venous blood, the method comprising:
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placing emitter and receiver elements of a light oximeter device on the patient'"'"'s skin in the vicinity of the deep vascular structure of interest wherein the deep vascular structure contains central venous or mixed venous blood, further wherein placement of said elements is achieved through matching of a plethysmography trace obtained from the oximeter device to known plethysmography characteristics of the deep vascular structure of interest; and determining oxygen saturation of blood within the deep vascular structure of interest, wherein oxygen saturation is determined from a ratio of light absorbed at different wavelengths by haemoglobin in the blood within the deep vascular structure of interest. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An oximetry device comprising:
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a central processing unit, a display; and emitter and receiver elements adapted for releasable application to human skin, wherein the emitter elements are configured to emit light of both red and infra-red wavelengths and the receiver elements are configured to detect said light, and to transmit information relating to levels of emitted and received light to said central processing unit; wherein said central processing unit is configured to match plethysmography characteristics derived from the transmitted information relating to levels of emitted and received light with predetermined plethysmography characteristics of a deep vascular structure of interest that contains central venous or mixed venous blood, to ensure positioning of the emitter and receiver elements on the skin in a vicinity of the deep vascular structure of interest;
said central processing unit also being configured to derive a measurement of blood oxygen saturation within the deep vascular structure of interest from the information relating to levels of emitted and received light, for display;wherein the central processing unit, display and emitter and receiver elements are workably connected in use. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification