Fluid titration system
First Claim
1. A fluid titration system comprising:
- a noninvasive optical sensor including a light source configured to irradiate tissue of a monitored patient and one or more photodetectors configured to detect said light after attenuation by said tissue, said sensor outputting a signal responsive to said detected attenuated light, said signal including a pulsatile component responsive to variable absorption and a nonpulsatile component responsive to static absorption, said pulsatile component and said nonpulsatile component indicative of a blood volume in said patient;
a physiological monitor configured to communicate with said sensor and receive said signal, said physiological monitor including a processor configured to process said signal to determine a measure of variability that depends at least on a ratio of said pulsatile component to said nonpulsatile component;
a fluid titration controller configured to access said measure of variability and to output an infusion trigger when said measure of variability indicates a need for additional liquids by said patient; and
a stand-alone infusion device configured to administer liquid solutions to said patient upon receipt of said infusion trigger, wherein said physiological monitor also houses said fluid titration controller.
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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.
573 Citations
20 Claims
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1. A fluid titration system comprising:
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a noninvasive optical sensor including a light source configured to irradiate tissue of a monitored patient and one or more photodetectors configured to detect said light after attenuation by said tissue, said sensor outputting a signal responsive to said detected attenuated light, said signal including a pulsatile component responsive to variable absorption and a nonpulsatile component responsive to static absorption, said pulsatile component and said nonpulsatile component indicative of a blood volume in said patient; a physiological monitor configured to communicate with said sensor and receive said signal, said physiological monitor including a processor configured to process said signal to determine a measure of variability that depends at least on a ratio of said pulsatile component to said nonpulsatile component; a fluid titration controller configured to access said measure of variability and to output an infusion trigger when said measure of variability indicates a need for additional liquids by said patient; and a stand-alone infusion device configured to administer liquid solutions to said patient upon receipt of said infusion trigger, wherein said physiological monitor also houses said fluid titration controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of managing a blood volume of a monitored patient, the method comprising:
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noninvasively detecting, with a detector of a noninvasive sensor, light attenuated by tissue of said monitored patient at a measurement site; electronically determining, with a signal processor, a measure of variability depending at least on a ratio of a pulsatile component to a nonpulsatile component of a signal that is responsive to said detected light, said pulsatile component and said nonpulsatile component indicative of a blood volume in said tissue, said pulsatile component responsive to variable absorption and said nonpulsatile component responsive to static absorption; electronically determining, with said signal processor, whether said measure of variability indicates a need for said monitored patient to receive additional liquid solutions; electronically triggering a stand-alone infusion device when said determining indicates said need, wherein said triggering comprises generating with an oximeter an infusion device trigger signal; and administering, with said stand-alone infusion device, liquid solutions when said infusion device is triggered. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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18. A patient monitoring system comprising:
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a noninvasive optical sensor including a light source configured to irradiate tissue of a monitored patient and one or more photodetectors configured to detect said light after attenuation by said tissue, said sensor outputting a signal responsive to said detected attenuated light, said signal including a pulsatile component responsive to variable absorption and a nonpulsatile component responsive to static absorption, said pulsatile component and said nonpulsatile component indicative of a blood volume in said patient; a physiological monitor configured to communicate with said sensor and receive said signal, said physiological monitor including a processor configured to process said signal to determine a measure of variability that depends at least on a ratio of said pulsatile component to said nonpulsatile component; and a fluid titration controller configured to access said measure of variability and to output an infusion indication when said measure of variability indicates a need for additional liquids by said patient, said infusion indication guiding adjustment of administration of liquid solutions to said patient with a stand-alone infusion device configured to administer said liquid solutions to said patient, wherein said physiological monitor also houses said fluid titration controller. - View Dependent Claims (19, 20)
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Specification