Blood pressure measuring device and method
First Claim
1. A device for measuring blood pressure of a living body having a pulse beat with a rhythm and producing a pulse wave propagating with a pulse wave velocity, comprising:
- sensor means for generating sensor data when the sensor means is attached to the living body; and
electronic circuit means for determining the blood pressure of the living body from the sensor data, the electronic circuit means includingfirst means, responsive to the sensor data, for determining a measurement value which is a measure for a first variable that can assume a plurality of first variable values, the first variable changing over time in the rhythm of the pulse beat and being correlated with at least one of the blood pressure and a change in the blood pressure,second means, responsive to the sensor data, for determining another measurement value which is a measure for a second variable that can assume a plurality of second variable values, the second variable being correlated with at least one of the pulse wave velocity and a change in the pulse wave velocity,third means for receiving calibration data during a calibration procedure and for storing at least one constant determined by the calibration data,fourth means for determining a function value on the basis of the measurement value for the first variable and the measurement value for the second variable; and
fifth means for using the function value and said at least one constant to determine a value for the blood pressure.
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Accused Products
Abstract
A device for measuring blood pressure includes a sensor arrangement which is releasably attached to the exterior of a body and which is electrically conductively connected with electronic circuit. The sensor arrangement and the circuit are configured to determine, in at least one measuring region of the body, a valve which is a measure for a variable that changes periodically over time in the rhythm of the pulse beat and which is correlated with the blood pressure. This variable may, for example, be the flow velocity and/or flow quantity and/or the volume of the arterial blood and/or a cross-sectional dimension and/or the flow cross section area of an arterial blood vessel. The sensor and circuit further determine a value which is a measure for the pulse wave velocity. By linking the two values together and including at least one calibration value, at least one value that is characteristic for of the blood pressure (preferably including at least the systolic blood. pressure) can be determined. The device makes it possible to measure the blood pressure of a person at least quasi-continuously with relatively little bother for the person.
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Citations
25 Claims
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1. A device for measuring blood pressure of a living body having a pulse beat with a rhythm and producing a pulse wave propagating with a pulse wave velocity, comprising:
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sensor means for generating sensor data when the sensor means is attached to the living body; and electronic circuit means for determining the blood pressure of the living body from the sensor data, the electronic circuit means including first means, responsive to the sensor data, for determining a measurement value which is a measure for a first variable that can assume a plurality of first variable values, the first variable changing over time in the rhythm of the pulse beat and being correlated with at least one of the blood pressure and a change in the blood pressure, second means, responsive to the sensor data, for determining another measurement value which is a measure for a second variable that can assume a plurality of second variable values, the second variable being correlated with at least one of the pulse wave velocity and a change in the pulse wave velocity, third means for receiving calibration data during a calibration procedure and for storing at least one constant determined by the calibration data, fourth means for determining a function value on the basis of the measurement value for the first variable and the measurement value for the second variable; and fifth means for using the function value and said at least one constant to determine a value for the blood pressure. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A device for measuring blood pressure of a living body having a pulse beat with a rhythm and producing a pulse wave propagating with a pulse wave velocity, comprising:
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sensor means for generating sensor data when the sensor means is attached to the living body; and electronic circuit means for determining the blood pressure of the living body from the sensor data, the electronic circuit means including first means, responsive to the sensor data, for determining a measurement value which is a measure for a first variable that can assume a plurality of first variable values, the first variable changing over time in the rhythm of the pulse beat and being correlated with at least one of the blood pressure and a change in the blood pressure, second means, responsive to the sensor data, for determining another measurement value which is a measure for a second variable that can assume a plurality of second variable values, the second variable being correlated with at least one of the pulse wave velocity and a change in the pulse wave velocity, third means for receiving calibration data during a calibration procedure and for storing at least one constant determined by the calibration data, fourth means for storing a table which associates table values with variable values, including at least the second variable values, fifth means for selecting one of the table values on the basis of the measurement value for the second variable to provide a selected table value, sixth means for multiplying the selected table value by one of the measurement value for the first variable, a table value associated by the table with the measurement value for the first variable, and a value computed from the measurement value for the first variable by a predetermined equation to provide a product value, and seventh means for using the product value and said at least one constant to determine a value for the blood pressure. - View Dependent Claims (18, 19, 20)
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21. A device for measuring blood pressure of a living body having a pulse beat with a rhythm and producing a pulse wave propagating with a pulse wave velocity, comprising:
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sensor means for generating sensor data when the sensor means is attached to the living body; and electronic circuit means for determining the blood pressure of the living body from the sensor data, the electronic circuit means including first means, responsive to the sensor data, for determining a measurement value which is a measure for a first variable that changes over time in the rhythm of the pulse beat and is correlated with at least one of the blood pressure and a change in the blood pressure, second means, responsive to the sensor data, for determining another measurement value which is a measure for a second variable that is correlated with at least one of the pulse wave velocity and a change in the pulse wave velocity, third means for receiving calibration data during a calibration procedure and for storing at least one constant determined by the calibration data, and fourth means for computing a blood pressure value using an equation expressing the blood pressure explicitly in dependence on the measurement value for the first variable, the measurement value for the second variable, and the at least one constant. - View Dependent Claims (22)
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23. A method of determining the blood pressure of a living body using a device which includes sensor means for generating sensor data and electronic circuit means for determining the blood pressure of the living body from the sensor data, the living body having a pulse beat with a rhythm and producing a pulse wave propagating with a pulse wave velocity, said method comprising the steps of:
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(a) disposing the sensor means on the body at at least one measuring region that includes at least one arterial blood vessel; (b) using the electronic circuit means to repeatedly determine, in response to the sensor data, a measurement value which is a measure for a first variable that can assume a plurality of first variable values, the first variable periodically changing over time in the rhythm of the pulse beat; (c) using the electronic circuit means to repeatedly determine, in response to the sensor data, another measurement value which is a measure for a second variable that can assume a plurality of second variable values, the second variable being the pulse wave velocity; (d) measuring the blood pressure of the body during a calibration procedure; (e) storing, in the electronic circuit means, at least one constant determined by the calibration procedure; (f) using the electronic circuit means to repeatedly determine a function value on the basis of the repeatedly-determined measurement value for the first variable and the repeatedly-determined measurement value for the second variable; and (g) using the repeatedly-determined function value and the at least one constant in the electronic circuit means to provide blood pressure values. - View Dependent Claims (24, 25)
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Specification