Bioimpedance system and sensor and technique for using the same
First Claim
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1. A monitoring system comprising a processor configured to execute instructions to:
- receive a bioimpedance signal from at least one bioimpedance sensor;
receive a water fraction signal from at least one optical water fraction sensor;
determine a tissue hydration based on the water fraction signal; and
determine a physiological parameter value based on the bioimpedance signal and a correction factor, wherein the correction factor is based on the tissue hydration.
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Abstract
A sensor assembly and/or systems for bioimpedance measurements may provide information related to the lean body water of the patient'"'"'s tissue. The information related to the patient'"'"'s lean body water may be determined by spectroscopic methods for determining water fraction. The patient'"'"'s fat-free hydration levels may be incorporated into determinations of physiological parameters that may be determined by bioimpedance, such as cardiac output, hemtocrit, or body fat percentage.
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Citations
23 Claims
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1. A monitoring system comprising a processor configured to execute instructions to:
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receive a bioimpedance signal from at least one bioimpedance sensor; receive a water fraction signal from at least one optical water fraction sensor; determine a tissue hydration based on the water fraction signal; and determine a physiological parameter value based on the bioimpedance signal and a correction factor, wherein the correction factor is based on the tissue hydration. - View Dependent Claims (2, 3, 4, 5, 6, 15, 16, 17)
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7. A method, comprising:
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receiving a bioimpedance signal from at least one bioimpedance sensor; receiving a water fraction signal from at least one optical water fraction sensor; determining lean body water content based on the water fraction signal; and determining a physiological parameter value based at least in part on the bioimpedance signal and the lean body water content using an algorithm, wherein the lean body water content is used to correct for a hydration assumption in the algorithm; and providing an output related to the physiological parameter. - View Dependent Claims (8, 18)
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9. A patient monitoring system comprising:
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a sensor assembly comprising; a plurality of electrodes disposed on a sensor body, wherein at least one of the electrodes is capable of generating a signal related to an impedance of a patient'"'"'s tissue; and a water fraction sensor disposed on the sensor body, wherein the water fraction sensor comprises an emitter capable of emitting light into the patient'"'"'s tissue and a detector capable of detecting the light; and a monitor comprising a processor configured to; determine a hydration factor of the patient based on a signal from the water fraction sensor; and determine a physiological parameter of the patient based on a signal from the plurality of electrodes using an algorithm, wherein the hydration factor is substituted for a hydration factor assumption of the algorithm. - View Dependent Claims (10, 11, 12, 13, 14, 19, 20, 21, 22, 23)
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Specification