Pressure gauge, blood pressure gauge, method of determining pressure values, method of calibrating a pressure gauge, and computer program
First Claim
1. A pressure gauge for determining at least one pressure value describing a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, comprising:
- a pulse wave characterizer configured to acquire transit time information describing a transit time of a pulse wave between a first location and a second location, and amplitude information describing a change in a measurement signal, which is based on the pulse wave, between two phases of the pulse wave; and
a pressure value determiner configured to acquire a first pressure value describing a pressure of the fluid in a first phase of the pulsating flow on the basis of the transit time information and while using a first mapping which maps the transit time of the pulse wave to the first pressure value, whereinthe pressure value determiner is configured to acquire a second pressure value describing a pressure of the fluid in a second phase of the pulsating flow on the basis of the first pressure value and the amplitude information while using a second mapping,the second mapping describes a relationship, which depends on the first pressure value, between the first pressure value, the second pressure value and the amplitude information,the second mapping further describes a relationship between an amplitude of the measurement signal and an amplitude of the pulse wave, taking into account the first pressure value,the second mapping describes a difference between the first pressure value and the second pressure value that is dependent on the amplitude information and on the first pressure value,the second pressure value represents a systolic pressure value, andthe pressure gauge is implemented by a hardware apparatus, a computer, or a combination of a hardware apparatus and a computer.
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Accused Products
Abstract
A pressure gauge for determining at least one pressure value describing a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, includes a pulse wave characterizer. The pulse wave characterizer is configured to obtain transmit time information of a pulse wave, and amplitude information of the pulse wave. The pressure gauge additionally includes a pressure value determiner configured to obtain a first pressure value describing a pressure of the fluid in a first phase, on the basis of the transmit time information and while using a mapping. The pressure value determiner is further configured to obtain a second pressure value describing a pressure of the fluid in a second phase, on the basis of the first pressure value and the amplitude information while using a mapping.
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Citations
33 Claims
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1. A pressure gauge for determining at least one pressure value describing a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, comprising:
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a pulse wave characterizer configured to acquire transit time information describing a transit time of a pulse wave between a first location and a second location, and amplitude information describing a change in a measurement signal, which is based on the pulse wave, between two phases of the pulse wave; and a pressure value determiner configured to acquire a first pressure value describing a pressure of the fluid in a first phase of the pulsating flow on the basis of the transit time information and while using a first mapping which maps the transit time of the pulse wave to the first pressure value, wherein the pressure value determiner is configured to acquire a second pressure value describing a pressure of the fluid in a second phase of the pulsating flow on the basis of the first pressure value and the amplitude information while using a second mapping, the second mapping describes a relationship, which depends on the first pressure value, between the first pressure value, the second pressure value and the amplitude information, the second mapping further describes a relationship between an amplitude of the measurement signal and an amplitude of the pulse wave, taking into account the first pressure value, the second mapping describes a difference between the first pressure value and the second pressure value that is dependent on the amplitude information and on the first pressure value, the second pressure value represents a systolic pressure value, and the pressure gauge is implemented by a hardware apparatus, a computer, or a combination of a hardware apparatus and a computer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A method of determining, while using a pressure gauge, pressure values which describe a pressure of a fluid that is flowing in a pulsating manner in at least two phases of the pulsating flow, comprising:
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acquiring, by a pulse wave characterizer, transit time information describing a transit time of a pulse wave between a first location and a second location; acquiring, by the pulse wave characterizer, amplitude information describing a change in a measurement signal, based on the pulse wave, between two phases of the pulse wave; determining, by a pressure value determiner, a first pressure value, which describes a pressure of the fluid in a first phase of the pulsating fluid, on the basis of the transit time information and while using a first mapping, which maps a transit time of the pulse wave to the first pressure value; and determining, by the pressure value determiner, a second pressure value, which describes a pressure of the fluid in a second phase of the pulsating flow, on the basis of the first pressure value and of the amplitude information, while using a second mapping, which describes a relationship —
which is dependent on the first pressure value —
between the first pressure value, the second pressure value and the amplitude information, whereinthe second mapping further describes a relationship between an amplitude of the measurement signal and an amplitude of the pulse wave, taking into account the first pressure value, the second mapping describes a difference between the first pressure value and the second pressure value that is dependent on the amplitude information and on the first pressure value, the second pressure value represents a systolic pressure value, and the method is performed by a hardware apparatus, a computer, or a combination of a hardware apparatus and a computer. - View Dependent Claims (24)
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25. A method of calibrating a pressure gauge configured to determine, while using a first mapping and a second mapping, at least one pressure value which describes a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, comprising:
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determining, by a pulse wave characterizer, a plurality of pieces of reference transit time information describing transit times of pulse waves between a first location and a second location for a plurality of pressure values, and a plurality of associated reference pressure values; determining, by a pressure value determiner, the first mapping, which describes a relationship between transit times of the pulse waves and associated pressure values, while using the reference transit time information and the reference pressure values; and determining, by a pressure value determiner, the second mapping, which describes a relationship, that is dependent on a first pressure value, between the first pressure value, a second pressure value and amplitude information, wherein a qualitative course of the second mapping is specified on the basis of the first mapping, the amplitude information describes a change of a measurement signal from a sensor between phases of the pulse waves, the second mapping describes a difference between the first pressure value and the second pressure value that is dependent on the amplitude information and on the first pressure value, the second pressure value represents a systolic pressure value, and the method is performed by a hardware apparatus, a computer, or a combination of a hardware apparatus and a computer. - View Dependent Claims (26, 27, 28, 29, 30, 31)
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32. A non-transitory computer-readable medium including a computer program for performing, when the computer program is performed on a computer, a method of determining, while using a pressure gauge, pressure values which describe a pressure of a fluid that is flowing in a pulsating manner in at least two phases of the pulsating flow, the method comprising:
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acquiring transit time information describing a transit time of a pulse wave between a first location and a second location; acquiring amplitude information describing a change in a measurement signal, based on the pulse wave, between two phases of the pulse wave; determining a first pressure value, which describes a pressure of the fluid in a first phase of the pulsating fluid, on the basis of the transit time information and while using a first mapping, which maps a transit time of the pulse wave to the first pressure value; and determining a second pressure value, which describes a pressure of the fluid in a second phase of the pulsating flow, on the basis of the first pressure value and of the amplitude information, while using a second mapping, which describes a relationship —
which is dependent on the first pressure value —
between the first pressure value, the second pressure value and the amplitude information, whereinthe second mapping describes a relationship between an amplitude of the measurement signal and an amplitude of the pulse wave, taking into account the first pressure valve, the second mapping describes a difference between the first pressure value and the second pressure value that is dependent on the amplitude information and on the first pressure value, and the second pressure value represents a systolic pressure value.
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33. A non-transitory computer-readable medium including a computer program for performing, when the computer program is performed on a computer, a method of calibrating a pressure gauge configured to determine, while using a first mapping and a second mapping, at least one pressure value which describes a pressure of a fluid flowing in a pulsating manner in a phase of the pulsating flow, the method comprising:
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determining a plurality of pieces of reference transit time information describing transit times of pulse waves between a first location and a second location for a plurality of pressure values, and a plurality of associated reference pressure values; determining the first mapping, which describes a relationship between transit times of the pulse waves and associated pressure values, while using the reference transit time information and the reference pressure values; and determining the second mapping, which describes a relationship, that is dependent on a first pressure value, between the first pressure value, a second pressure value and amplitude information, a qualitative course of the second mapping is specified on the basis of the first mapping, the amplitude information describes a change of a measurement signal from a sensor between phases of the pulse waves, the second mapping describes a difference between the first pressure value and the second pressure value that is dependent on the amplitude information and on the first pressure value, and the second pressure value represents a systolic pressure value.
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Specification