Device and method for the continuous non-invasive measurement of blood pressure
Inventors
Mills, Eric • O'Brien, Terence Kevin • Fortin, Jürgen • Maier, Katja
Assignees
Interested in licensing this patent?
MTEC can help explore whether this patent might be available for licensing for your application.
Publication Number
US-9615756-B2
Publication Date
2017-04-11
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 continuous non-invasive blood pressure monitoring system in which a controller monitors a first blood pressure measurement based on a first blood pressure signal received from a first blood pressure measurement device. The controller calculates a med-dia-ratio using the first blood pressure signal only, based on mean arterial pressure, diastolic pressure, and systolic pressure derived from the first blood pressure signal.
The controller uses the calculated med-dia-ratio to decide whether to initiate acquiring a second blood pressure measurement based on a second blood pressure signal from a second blood pressure measurement device. When the med-dia-ratio exceeds a predetermined threshold, the controller initiates the second measurement, and then re-calibrates the first blood pressure measurement based on the second blood pressure measurement if the first measurement differs from the second by more than a predetermined amount.
The system further includes logic to inhibit initiating acquiring the second blood pressure measurement if a second blood pressure measurement has been taken during a predetermined preceding period of time and if the first blood pressure measurement was not recalibrated in view of the second blood pressure measurement. The documented description also defines pulse pressure and med-dia ratio thresholds, optionally includes pulse-pressure filtering, and uses a calibration function for recalibration after the second measurement.
Claims Coverage
The document includes two independent claims, a device claim and a method claim. Across both independent claims, there are three main inventive features.
Med-dia-ratio calculated from the first blood pressure signal only
The controller calculates a med-dia-ratio using the first blood pressure signal only, based on mean arterial pressure, diastolic pressure, and systolic pressure derived from the first blood pressure signal.
Conditional initiation of second measurement based on med-dia-ratio threshold
The controller initiates acquiring a second blood pressure measurement based on a second blood pressure signal from the second blood pressure measurement device if the med-dia-ratio exceeds a predetermined threshold.
Re-calibration of the first measurement based on second measurement difference
The controller re-calibrates the first blood pressure measurement based on the second blood pressure measurement if the first blood pressure measurement differs from the second blood pressure measurement by more than a predetermined amount.
Inhibition of second measurement initiation during preceding period when no recalibration occurred
The controller inhibit initiating acquiring a second blood pressure measurement if a second blood pressure measurement has been taken during a predetermined preceding period of time and if the first blood pressure measurement was not recalibrated in view of the second blood pressure measurement.
Both independent claims cover monitoring blood pressure by computing a med-dia-ratio from the first blood pressure signal only, conditionally initiating a second blood pressure measurement when the med-dia-ratio exceeds a predetermined threshold, recalibrating the first measurement based on the second measurement when the measurements differ by more than a predetermined amount, and inhibiting further second measurements during a preceding period when recalibration did not occur.
Stated Advantages
Not explicitly described in patent.
Documented Applications
Not explicitly described in patent.
Interested in licensing this patent?