Physiological-signal-analysis device for measuring a blood pressure and method
First Claim
1. A method of determining whether an oscillation of a pressure signal acquired from a patient satisfies one or more criteria, the method comprising the acts of:
- acquiring a first oscillation having a first fiducial point;
acquiring a second oscillation having a second fiducial point;
calculating a time interval representing a time from the first fiducial point to the second fiducial point; and
determining whether the time interval is a substantial integral multiple of a nominal time interval.
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Accused Products
Abstract
A physiological-signal-analysis device for determining a blood pressure value of a patient and a method of operating the device. The device includes a cuff attachable to an extremity of the patient, a pneumatic system connected to the cuff that supplies a fluid to the cuff, a pressure transducer that measures the pressure signal having pressure oscillations, and a control unit connected to the pneumatic system and the pressure transducer. The control unit is operable to acquire a first oscillation having a first fiducial point, acquire a second oscillation having a second fiducial point, calculate a time interval representing a time from the first fiducial point to the second fiducial point, decide against selecting the second oscillation when the time interval is not a substantial integral multiple of a nominal oscillation period, and calculate a blood pressure value based on selected oscillations.
35 Citations
40 Claims
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1. A method of determining whether an oscillation of a pressure signal acquired from a patient satisfies one or more criteria, the method comprising the acts of:
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acquiring a first oscillation having a first fiducial point;
acquiring a second oscillation having a second fiducial point;
calculating a time interval representing a time from the first fiducial point to the second fiducial point; and
determining whether the time interval is a substantial integral multiple of a nominal time interval. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 35, 36, 37, 38, 39, 40)
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17. A method of determining whether an oscillation of a blood pressure signal satisfies a criteria, the method comprising the acts of:
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acquiring an electrocardiogram (ECG) signal having an ECG beat;
identifying a fiducial point on the ECG beat;
calculating a QRS-to-pulse interval with the second fiducial point and the fiducial point of the ECG; and
determining whether the QRS-to-pulse interval is within a QRS-to-pulse interval range.
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19. A method of determining whether an oscillation of a blood pressure signal satisfies a criteria, the method comprising the acts of:
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acquiring a first electrocardiogram (ECG) beat having a first fiducial point;
acquiring a first oscillation having a relationship to the first ECG beat;
acquiring a second ECG beat having a second fiducial point;
acquiring a second oscillation having a relationship to the second ECG beat;
calculating a time interval representing a time from the first fiducial point to the second fiducial point;
determining whether the time interval is close to an integral multiple of a nominal time interval; and
deciding against selecting the second pressure oscillation when the time interval is not a substantial integral multiple of a nominal time interval.
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23. A physiological-signal-analysis device for determining a blood pressure value of a patient, the device comprising:
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a cuff attachable to an extremity of a patient;
a pneumatic system connected to the cuff that supplies a fluid to the cuff;
a pressure transducer that captures a pressure signal having pressure oscillations;
a control unit connected to the pneumatic system and the pressure transducer, the control unit being operable to acquire a first oscillation having a first fiducial point, acquire a second oscillation having a second fiducial point, calculate a time interval representing a time from the first fiducial point to the second fiducial point, decide against selecting the second oscillation when the time interval is not a substantial integral multiple of a nominal oscillation period, and calculate the blood pressure value based upon selected oscillations.
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34. A software program for operating a physiological-signal-analysis device, the device including a cuff, a pneumatic system, a pressure transducer, and a control unit, the software program comprising:
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a pneumatic control module for controlling the operation of the pneumatic system; and
an analysis module for analyzing input from the pressure transducer and for calculating a blood pressure, the analysis module including instructions that are implemented for acquiring a first oscillation having a first fiducial point;
acquiring a second oscillation having a second fiducial point;
calculating a time interval representing a time from the first fiducial point to the second fiducial point; and
determining whether the time interval is close to an integral multiple of a nominal time interval.
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Specification