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 an integral multiple of a nominal.
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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
47 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 an integral multiple of a nominal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
applying a pressure to a patient'"'"'s extremity; and
acquiring the first and second oscillations at a same pressure.
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16. A method as set forth in claim 1 and further comprising the acts of:
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applying a first pressure to a patient'"'"'s extremity;
wherein the act of acquiring the first oscillation occurs when the first pressure is applied to a patient'"'"'s extremity;
applying a second pressure to a patient'"'"'s extremity, the second pressure being less than the first pressure; and
wherein the act of acquiring the second oscillation occurs when the second pressure is applied to the patient'"'"'s extremity.
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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 a first beat and a second beat;
identifying a first fiducial point on the first ECG beat and a second fiducial point on the second ECG beat;
acquiring a blood pressure signal having a first oscillation related to the first ECG beat and a second oscillation related to the second ECG beat;
calculating a time interval between the first fiducial point and the second fiducial point;
determining whether the time interval is an integral multiple of a nominal time interval; and
rejecting the second oscillation for use in blood pressure calculations if the time interval is not an integral multiple of a nominal time interval. - View Dependent Claims (18, 19, 20, 21)
classifying at least one of the first ECG beat and the second ECG beat; and
adjusting the nominal time interval when at least one of the first ECG beat and the second ECG beat is an abnormal beat.
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19. A method as set forth in claim 17 wherein the act of determining whether the time interval is an integral multiple of a nominal time interval includes determining whether the time interval is within a time interval range.
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20. A method as set forth in claim 17 wherein the act of determining whether the time interval is an integral multiple of a nominal time interval includes the acts of setting a variable (N) and determining whether the interval divided by (N) is within a time interval range.
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21. A method as set forth in claim 20 wherein the act of determining whether the interval divided by (N) is within a time interval range includes the acts of multiplying the nominal time interval by a first factor to calculate a high value, multiplying the nominal oscillation period by a second factor to calculate a low value, and determining whether the interval divided by (N) is between the high and low values.
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22. A method of rejecting an artifact in a blood pressure signal, the method comprising the acts of:
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acquiring an electrocardiogram (ECG) signal having an ECG beat;
identifying a QRS fiducial point on the ECG beat;
acquiring a blood pressure signal having an oscillation related to the ECG beat;
identifying a beginning-of-oscillation fiducial point on the oscillation;
calculating a QRS-to-oscillation interval between the QRS fiducial point and the beginning-of-oscillation fiducial point;
determining whether the oscillation is an artifact based on the QRS-to-oscillation interval; and
rejecting the oscillation for use in blood pressure calculations if the oscillation is an artifact.
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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 a pressure oscillation; and
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 an integral multiple of a nominal oscillation period, and calculate the blood pressure value based upon selected oscillations. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A device as set forth in claim wherein the control unit determining whether the interval divided by (N) is within a time interval range includes the control unit multiplying the nominal oscillation period by a first factor to calculate a high value, the control unit multiplying the nominal oscillation period by a second factor to calculate a low value, and the control unit determining whether the interval divided by (N) is between the high and low values.
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37. A computer program embodied by a computer readable medium capable of being executed by a computer, the computer program capable of causing the computer to operate a physiological-signal-analysis device, the device including a cuff, a pneumatic system, a pressure transducer, and a control unit, the computer 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. - View Dependent Claims (38, 39, 40, 41, 42, 43)
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44. 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 an integral multiple of a nominal time interval. - View Dependent Claims (45, 46, 47)
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Specification