PULSE OXIMETRY SYSTEM AND TECHNIQUES FOR DERIVING CARDIAC AND BREATHING PARAMETERS FROM EXTRA-THORACIC BLOOD FLOW MEASUREMENTS
First Claim
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1. A non-invasive pulse oximetry system comprising:
- a light source emitting at least two light signals having distinct wavelengths directed at an appendage of a subject; and
a light receiver mounted adjacent to said appendage and which receives said light signals;
wherein the pulse oximetry system derives at least a heart rate value, a blood oxygenation value and a breath distention value from said received light signals.
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Abstract
Medical devices and techniques derive breath rate, breath distention, and pulse distention measurements of a subject from a pulse oximeter system coupled to a subject. These parameters, together with the conventional physiologic parameters obtained from a pulse oximeter system, can be used to assist in controlling the ventilation levels and the anesthesia levels of the subject. The development has human applications and particular applications for animal research.
90 Citations
16 Claims
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1. A non-invasive pulse oximetry system comprising:
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a light source emitting at least two light signals having distinct wavelengths directed at an appendage of a subject; and
a light receiver mounted adjacent to said appendage and which receives said light signals;
wherein the pulse oximetry system derives at least a heart rate value, a blood oxygenation value and a breath distention value from said received light signals. - View Dependent Claims (2, 3, 4)
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5. A non-invasive pulse oximetry system comprising:
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A light source adapted to be attached to an external appendage of a subject and configured to emit at least two distinct wavelengths of light directed at the appendage; and
A receiver adapted to be attached to the external appendage of a subject and configured to receive the light from the light source that has been directed at the appendage and generating received signals there from, wherein the pulse oximetry system derives a breath rate of the subject from the received signals, wherein the breath rate is calculated by filtering the received signals to remove heart rate components thereof, then reconstructing a breath signal in the absence of the heart rate components and wherein the breath rate is calculated using the reconstructed breath signal. - View Dependent Claims (6, 7, 8)
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9. A non-invasive pulse oximetry system for a small mammal comprising:
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A light source adapted to be attached to an external appendage of a small mammal and configured to emit at least two distinct wavelengths of light directed at the appendage; and
A receiver adapted to be attached to the external appendage of a subject small mammal and configured to receive the light from the light source that has been directed at the appendage and generating received signals there from, wherein the pulse oximetry system derives a breath rate of the subject from the received signals. - View Dependent Claims (10, 11, 12, 14)
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13. A non-invasive pulse oximetry system comprising:
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A light source adapted to be attached to an external appendage of a subject and configured to emit at least two distinct wavelengths of light directed at the appendage; and
A receiver adapted to be attached to the external appendage of a subject and configured to receive the light from the light source that has been directed at the appendage and generating received signals there from, wherein the pulse oximetry system derives at least one physiologic parameter of the subject from the received signals by performing an FFT on at least one time domain signal to generate a frequency domain representation of the at least one time domain signal, filtering the transformed time domain signal in the frequency domain, performing an inverse FFT on the filtered FFT signal to form a filtered time domain signal, and calculating the at least one physiologic parameter by measuring the filtered time domain signal. - View Dependent Claims (15, 16)
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Specification