Fluid titration system
First Claim
1. A fluid titration system comprising:
- an optical sensor that transmits multiple wavelengths of optical radiation into a tissue site of a person and detects the optical radiation after attenuation by pulsatile blood flowing within the tissue site so as to generate a sensor signal responsive to the detected optical radiation;
a physiological monitor in electrical communications with the optical sensor, the physiological monitor configured to calculate a measure of plethysmograph variability (PV) from the sensor signal; and
an infusion device that administers a liquid solution via an intravenous (IV) connection to the person in response to the measure of PV.
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Accused Products
Abstract
A fluid titration system has an optical sensor, a physiological monitor, a titration controller and an infusion device. The optical sensor transmits multiple wavelengths of light into a tissue site of a person and detects the optical radiation after attenuation by pulsatile blood flowing within the tissue site. The physiological monitor receives a resulting sensor signal and derives a plethysmograph that corresponds to the pulsatile blood flow. The monitor also calculates a plethysmograph variability measure that is responsive to changes in perfusion at the tissue site. A titration controller generates a fluid control output according to the variability measure. The infusion device administers a liquid solution via an intravenous (IV) connection to the person according to the fluid control output so as to regulate at least one of a fluid flow start, rate and stop.
867 Citations
20 Claims
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1. A fluid titration system comprising:
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an optical sensor that transmits multiple wavelengths of optical radiation into a tissue site of a person and detects the optical radiation after attenuation by pulsatile blood flowing within the tissue site so as to generate a sensor signal responsive to the detected optical radiation; a physiological monitor in electrical communications with the optical sensor, the physiological monitor configured to calculate a measure of plethysmograph variability (PV) from the sensor signal; and an infusion device that administers a liquid solution via an intravenous (IV) connection to the person in response to the measure of PV. - View Dependent Claims (2, 3, 4, 5)
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6. A fluid titration method comprising:
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deriving a plethysmograph waveform from an optical sensor attached to a person; determining a measure of perfusion variability corresponding to the plethysmograph waveform; and adjusting blood volume for the person based upon the perfusion variability metric. - View Dependent Claims (7, 8, 9, 10)
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11. A fluid titration system comprising:
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a sensor means for transmitting multiple wavelengths of optical radiation into a tissue site and detecting the optical radiation after attenuation by pulsatile blood flow within the tissue site; a physiological monitor means in communications with the sensor means for deriving a plethysmograph and calculating a measure of plethysmograph variability; an IV infusion device in communication with the fluid titration controller means configured to infuse a fluid into the person; and a titration controller means for at least partially regulating the fluid infusion in response to the measure of plethysmograph variability. - View Dependent Claims (12, 13, 14, 15)
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16. A fluid titration method comprising:
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deriving a plethysmograph in response to an optical sensor attached to a person, the plethysmograph having a plurality of pulses in response to the person'"'"'s arterial blood flow, the pulse minima of the plethysmograph defining a baseline; calculating a parameter indicative of a variability of the plethysmograph; infusing fluid into the person via an IV; and regulating the infusing according to the parameter. - View Dependent Claims (17, 18, 19, 20)
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Specification