Hemodynamic monitoring
Inventors
Mills, Eric • O'Brien, Terence Kevin • Fortin, Jürgen • Maier, Katja
Assignees
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Publication Number
US-9974448-B2
Publication Date
2018-05-22
Expiration Date
Abstract
A device and method for use in monitoring blood pressure. The device comprises a controller configured to monitor a first blood pressure measurement based on a first blood pressure signal. The controller is configured to initiate acquiring a second blood pressure measurement based on a second blood pressure signal if the first blood pressure measurement exceeds a predetermined threshold. The decision to initiate acquiring the second blood pressure measurement is based on only one blood pressure measurement.
Core Innovation
The invention relates to a device for monitoring blood pressure that is communicatively connected to a first blood pressure measurement device and a second blood pressure measurement device. The controller continuously monitors a first blood pressure measurement based on a first blood pressure signal received from the first blood pressure measurement device, and calculates a pulse pressure value using the first blood pressure signal only.
The controller initiates acquiring a calibration blood pressure signal and a calibration blood pressure measurement from the second blood pressure measurement device in response to at least one condition. The conditions include pulse pressure exceeding a predetermined threshold, a change in pulse pressure over a period of time exceeding a predetermined threshold, or pulse pressure being less than 15 mmHg or exceeding 150 mmHg, and repeated calibration acquisition is limited by additional rules.
After acquiring the calibration blood pressure measurement, the controller re-calibrates the first blood pressure measurement based on the first blood pressure measurement differing from the calibration blood pressure measurement by more than a predetermined amount. The re-calibration comprises amplifying the first blood pressure signal and/or applying an offset to the first blood pressure signal so that a systolic pressure and a diastolic pressure of the first blood pressure signal match, respectively, the systolic pressure and diastolic pressure of the calibration blood pressure signal.
Claims Coverage
The independent claims describe a blood-pressure monitoring device with a controller that continuously monitors a first blood pressure signal, calculates pulse pressure using the first signal only, conditionally acquires calibration from a second device based on pulse pressure criteria, and re-calibrates the first signal by amplification and/or offset to match systolic and diastolic values. The independent claims include four inventive features.
Pulse pressure calculation using first blood pressure signal only with conditional calibration acquisition
Continuously monitor a first blood pressure measurement based on a first blood pressure signal received from the first blood pressure measurement device; calculate a pulse pressure value using the first blood pressure signal only; initiate acquiring a calibration blood pressure signal from the second blood pressure measurement device and a calibration blood pressure measurement based on at least one condition being satisfied.
Re-calibration by amplifying and/or applying offset to match systolic and diastolic values
Re-calibrate the first blood pressure measurement based on the first blood pressure measurement differing from the calibration blood pressure measurement by more than a predetermined amount, wherein the re-calibration comprises amplifying the first blood pressure signal and/or applying an offset to the first blood pressure signal so that a systolic pressure and a diastolic pressure of the first blood pressure signal matches, respectively, a systolic pressure and a diastolic pressure of the calibration blood pressure signal.
Specific pulse pressure bounds for calibration acquisition
Initiate acquiring a calibration blood pressure signal from the second blood pressure measurement device and a calibration blood pressure measurement based on at least one of the following conditions being satisfied: the pulse pressure value is less than 15 mmHg, or the pulse pressure value exceeds 150 mmHg.
Calibration trigger based on change in pulse pressure over time
Initiate acquiring a calibration blood pressure signal from the second blood pressure measurement device and a calibration blood pressure measurement based on the change in pulse pressure over a period of time exceeding a predetermined threshold.
Across the independent claims, the coverage centers on using only a first blood pressure signal to calculate pulse pressure, conditionally triggering calibration acquisition from a second measurement device based on pulse pressure criteria, and re-calibrating the first blood pressure signal by amplification and/or applying an offset so systolic and diastolic values match the calibration blood pressure measurement.
Stated Advantages
Documented Applications
No documented applications found
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