MONITORING OF ACUTE STROKE PATIENTS
First Claim
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1. A method of monitoring an acute stroke patient, comprising:
- a) obtaining signals of impedance plethysmography (IPG) and photoplethysmography (PPG) in the patient, at least once an hour, for at least six hours;
b) applying a same or substantially same algorithm to the IPG and PPG signals to obtain first and second measures, respectively, of cerebral hemodynamics of the patient;
c) finding a measure based on comparing the first and second measures; and
d) applying a rule about alerting or not alerting medical personnel based on any of values, amount of change, and direction and rate of change of the measure based on comparing the first and second measures;
wherein the first and second measures each use an effective rise time of a cardiac cycle of the respective signal, or each use an integral of the respective signal over an effective rise time.
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Abstract
A method of monitoring an acute stroke patient, comprising:
- a) obtaining signals of impedance plethysmography (IPG), photoplethysmography (PPG) or both, in the patient, at least once an hour, for at least six hours;
- b) processing the one or more signals to obtain one or more measures of cerebral hemodynamics of the patient;
- c) applying a rule about alerting or not alerting medical personnel based on any of values, amount of change, and direction and rate of change of the measures.
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Citations
31 Claims
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1. A method of monitoring an acute stroke patient, comprising:
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a) obtaining signals of impedance plethysmography (IPG) and photoplethysmography (PPG) in the patient, at least once an hour, for at least six hours; b) applying a same or substantially same algorithm to the IPG and PPG signals to obtain first and second measures, respectively, of cerebral hemodynamics of the patient; c) finding a measure based on comparing the first and second measures; and d) applying a rule about alerting or not alerting medical personnel based on any of values, amount of change, and direction and rate of change of the measure based on comparing the first and second measures; wherein the first and second measures each use an effective rise time of a cardiac cycle of the respective signal, or each use an integral of the respective signal over an effective rise time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 25, 26, 28, 30)
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9. (canceled)
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24. (canceled)
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27. (canceled)
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29. A system for monitoring an acute stroke patient, comprising:
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a) an electric current source; b) at least two sensors adapted to be placed on the patient'"'"'s head, including at least one sensor comprising an IPG electrode structure adapted to pass current from the current source through the head to measure impedance, and at least one sensor comprising a PPG sensor powered by the current source; c) a controller adapted to receive waveforms of IPG and PPG signals from the sensors, process the IPG and PPG waveforms using a same or substantially same algorithm to obtain a measure of effective rise interval of a cardiac cycle of the waveform, or an integral of the waveform over the effective rise interval of a cardiac cycle of the waveform, compare the effective rise time or integral over effective rise time for the IPG and PPG signals to obtain one or more measures of cerebral hemodynamics of the patient, and apply a rule to decide when to issue a medical alert based on the measures; and d) an alert device, activated by the controller when the controller issues a medical alert, which alerts medical personnel when it is activated.
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31. (canceled)
Specification