CN113017588A - Blood pressure measuring method, system and device and sphygmomanometer - Google Patents
Blood pressure measuring method, system and device and sphygmomanometer Download PDFInfo
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Abstract
The invention discloses a blood pressure measuring method, in the scheme, in addition to calculating a blood pressure value according to a voltage difference signal output by a pressure sensor, a reference voltage of a first end of a reference resistor is also collected, then the reference voltage and the reference voltage are combined to obtain a measuring signal for eliminating constant current, when the blood pressure value is calculated based on the measuring signal, even if the constant current output by an operational amplifier power supply fluctuates due to the influence of temperature or other factors, the measuring signal does not contain variables related to the constant current output by the operational amplifier power supply, therefore, the measuring signal is not influenced by temperature, and further, when the blood pressure is measured, the blood pressure measuring precision is improved. The application also discloses a blood pressure measuring system, a blood pressure measuring device and a sphygmomanometer, and the blood pressure measuring system, the blood pressure measuring device and the sphygmomanometer have the same beneficial effects as the blood pressure measuring method.
Description
Technical Field
The invention relates to the field of blood pressure measurement, in particular to a blood pressure measurement method, a blood pressure measurement system, a blood pressure measurement device and a sphygmomanometer.
Background
The sphygmomanometer comprises a pressure sensor, and when the sphygmomanometer is used for measuring blood pressure, the pressure value measured by the pressure sensor is converted into an electric signal, and then the measured blood pressure value is obtained by calculating the electric signal.
Specifically, the sphygmomanometer further comprises a processor, an input end of the pressure sensor is connected with an operational amplifier power supply capable of outputting constant current, when the pressure sensor measures the blood pressure of a user, the sensed pressure change is converted into a resistance value change, and then a corresponding voltage difference signal is output based on the resistance value change, the processor can calculate the blood pressure value of the user based on the voltage difference signal, wherein the voltage difference signal is that the resistance value change quantity of a resistor inside the pressure sensor passes through the current value of the pressure sensor, and the current value passing through the pressure sensor is equal to the constant current value output by the operational amplifier power supply. However, the operational amplifier may cause the output constant current to fluctuate due to the influence of temperature or other factors, and at this time, the voltage difference signal may also fluctuate adaptively along with the fluctuation of the constant current value, so that if the blood pressure value of the user is calculated according to the voltage difference signal, the measurement result may be inaccurate.
Disclosure of Invention
The invention aims to provide a blood pressure measuring method, a blood pressure measuring system, a blood pressure measuring device and a sphygmomanometer, which are not influenced by temperature when measuring blood pressure and improve the accuracy of blood pressure measurement.
In order to solve the technical problems, the invention provides a blood pressure measuring method which is applied to a sphygmomanometer, wherein the sphygmomanometer comprises an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the operational amplifier power supply outputs constant current, the positive input end of the operational amplifier power supply is connected with a power supply which outputs fixed voltage, the negative input end of the operational amplifier power supply is respectively connected with the first end of the reference resistor and one end of the pressure sensor, the output end of the operational amplifier power supply is connected with the other end of the pressure sensor, and the second end of the reference resistor is grounded;
the method comprises the following steps:
acquiring a voltage differential signal output by the pressure sensor;
acquiring the voltage of a first end of the reference resistor, and taking the voltage as a reference voltage;
obtaining a measurement signal for eliminating the constant current based on the voltage differential signal and the reference voltage;
a blood pressure value is calculated based on the measurement signal.
Preferably, the voltage difference signal is the change in resistance of a resistor inside the pressure sensor.
Preferably, the constant current is passed through the resistance of the fixed voltage/the reference resistor.
Preferably, obtaining a measurement signal for canceling the constant current based on the voltage differential signal and the reference voltage includes:
converting the voltage differential signal from analog quantity to digital quantity to obtain a voltage differential signal of the digital quantity;
converting the reference voltage from analog quantity to digital quantity to obtain reference voltage of digital quantity;
obtaining a digital measurement signal for eliminating the constant current based on the digital voltage difference signal and a digital reference voltage;
calculating a blood pressure value based on the measurement signal, comprising:
the blood pressure value of the digital quantity is calculated based on the measurement signal of the digital quantity, and the blood pressure value of the digital quantity is converted into an analog quantity.
Preferably, obtaining a measurement signal for canceling the constant current based on the voltage differential signal and the reference voltage includes:
obtaining a measurement signal for eliminating the constant current through a first relational expression based on the voltage differential signal and the reference voltage;
the first relation is:
wherein, VoFor said voltage differential signal, VrefFor the reference voltage, Δ R is a resistance variation amount of a resistor inside the pressure sensor, RcIs the resistance value of the reference resistor, IrefK is the constant current, k is 1/resistance of the reference resistor, and k Δ R is the measurement signal.
In order to solve the technical problem, the invention further provides a blood pressure measuring system which is applied to a sphygmomanometer and comprises an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the positive input end of the operational amplifier power supply is connected with a power supply for outputting fixed voltage, the negative input end of the operational amplifier power supply is respectively connected with the first end of the reference resistor and one end of the pressure sensor, the output end of the operational amplifier power supply is connected with the other end of the pressure sensor, and the second end of the reference resistor is grounded;
the system comprises:
the first acquisition unit is used for acquiring a voltage differential signal output by the pressure sensor;
the second acquisition unit is used for acquiring the voltage of the first end of the reference resistor and taking the voltage as a reference voltage;
a first calculation unit configured to obtain a measurement signal from which the constant current is eliminated based on the voltage differential signal and the reference voltage;
a second calculation unit for calculating a blood pressure value based on the measurement signal.
In order to solve the above technical problem, the present invention also provides a blood pressure measuring device, including:
a memory for storing a computer program;
a processor for implementing the steps of the blood pressure measurement method described above when executing the computer program.
In order to solve the technical problem, the invention also provides a sphygmomanometer, which comprises the blood pressure measuring device, an operational amplifier power supply capable of outputting constant current, a pressure sensor and a reference resistor;
the input positive end of the operational amplifier power supply is connected with the power supply for outputting fixed voltage, the input negative end of the operational amplifier power supply is respectively connected with the first end of the reference resistor and one end of the pressure sensor, the output end of the operational amplifier power supply is connected with the other end of the pressure sensor, the second end of the reference resistor is grounded, and the first end of the reference resistor and the output end of the pressure sensor are respectively connected with the first input end and the second output end of the blood pressure measuring device.
Preferably, the method further comprises the following steps:
the voltage measuring module is connected with the first end of the reference resistor and is used for measuring the voltage value of the first end of the reference resistor;
the first input end of the analog-to-digital conversion module is connected with the output end of the voltage measurement module, and the second input end of the analog-to-digital conversion module is connected with the output end of the pressure sensor and used for converting the reference voltage from analog quantity to digital quantity and converting the voltage differential signal from analog quantity to digital quantity.
Preferably, the method further comprises the following steps:
the first input end of the reference resistor is connected with the first end of the reference resistor, the second input end of the reference resistor is connected with the output end of the pressure sensor, the first output end of the reference resistor is connected with the first input end of the analog-to-digital conversion module, and the second input end of the reference resistor is connected with the second input end of the analog-to-digital conversion module.
The application provides a blood pressure measuring method, in the scheme, in addition to calculating a blood pressure value according to a voltage difference signal output by a pressure sensor, reference voltage of a first end of a reference resistor is collected, then the reference voltage and the reference voltage are combined to obtain a measuring signal for eliminating constant current, when the blood pressure value is calculated based on the measuring signal, even if the constant current output by an operational amplifier power supply fluctuates due to the influence of temperature or other factors, the measuring signal does not contain variables related to the constant current output by the operational amplifier power supply, therefore, the measuring signal is not influenced, and further, when the blood pressure is measured, the blood pressure measuring precision is improved.
The application also provides a blood pressure measuring system, a blood pressure measuring device and a sphygmomanometer, and the blood pressure measuring system, the blood pressure measuring device and the sphygmomanometer have the same beneficial effects as the blood pressure measuring method.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed in the prior art and the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart of a blood pressure measurement method according to the present invention;
FIG. 2 is a schematic circuit diagram of a sphygmomanometer according to an embodiment of the present invention;
FIG. 3 is an internal circuit diagram of a pressure sensor according to the present invention;
FIG. 4 is a block diagram of a blood pressure measuring system according to the present invention;
fig. 5 is a block diagram of a blood pressure measuring device according to the present invention.
Detailed Description
The core of the invention is to provide a blood pressure measuring method, a system, a device and a sphygmomanometer, which are not influenced by temperature when measuring blood pressure and improve the accuracy of blood pressure measurement.
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a blood pressure measuring method provided by the present invention, and is applied to a sphygmomanometer, the sphygmomanometer includes an operational amplifier power supply 1 outputting a constant current, a pressure sensor 2 and a reference resistor 3, wherein an input positive terminal of the operational amplifier power supply 1 is connected to a power supply outputting a fixed voltage, an input negative terminal of the operational amplifier power supply 1 is respectively connected to a first end of the reference resistor 3 and one end of the pressure sensor 2, an output terminal of the operational amplifier power supply 1 is connected to the other end of the pressure sensor 2, and a second end of the reference resistor 3 is grounded;
the method comprises the following steps:
s11: acquiring a voltage differential signal output by the pressure sensor 2;
s12: acquiring the voltage of a first end of a reference resistor 3 and taking the voltage as a reference voltage;
s13: obtaining a measurement signal for eliminating the constant current based on the voltage differential signal and the reference voltage;
s14: a blood pressure value is calculated based on the measurement signal.
Referring to fig. 2, fig. 2 is a circuit schematic diagram of a sphygmomanometer provided by the present invention. For such a circuit diagram, if a blood pressure value is measured according to a manner of the prior art, that is, a voltage differential signal output by the pressure sensor 2 is used as a measurement signal, a blood pressure value is calculated based on the measurement signal, and the voltage differential signal output by the pressure sensor 2 is a product of a resistance value variation in the pressure sensor 2 and a constant current output by the operational amplifier power supply 1, when the constant current is changed due to temperature or other factors, the corresponding voltage differential signal and the corresponding blood pressure value are changed, which causes an inaccurate obtained blood pressure value. In order to solve the above technical problem, the present application is designed to introduce other signals into the circuit, so that when the other signals are combined with the voltage differential signal, the constant current variable in the voltage differential signal can be eliminated, and a new measurement signal independent of the constant current can be obtained. Because the new measuring signal does not contain the variable of the constant current, when the constant current changes, the measuring signal can not correspondingly change, thereby improving the accuracy of the blood pressure value.
Based on this, when this application was acquireed voltage difference signal, still acquireed the reference voltage of reference resistance 3 Rc's first end, combines above two and in order to obtain the measurement signal of eliminating the constant current, when calculating the blood pressure value based on the measurement signal like this, can avoid because the blood pressure value that constant current changes causes is inaccurate, has improved the stability of blood pressure value measurement.
In summary, when calculating the blood pressure value based on the measurement signal in the present application, even if the operational amplifier power supply 1 is affected by temperature or other factors to cause the constant current output by the operational amplifier power supply 1 to fluctuate, since the measurement signal does not include the variable related to the constant current output by the operational amplifier power supply 1, the measurement signal is not affected by temperature, and thus the accuracy of blood pressure measurement is improved when measuring blood pressure
On the basis of the above-described embodiment:
as a preferred embodiment, the voltage differential signal is a constant current which is the amount of change in the resistance of the resistor inside the pressure sensor 2.
This application aims at providing the specific computational formula of the voltage difference signal of pressure sensing output, specifically, when pressure sensor 2 is the resistance sensor, including piezo-resistor in pressure sensor 2, when measuring blood pressure, piezo-resistor converts the change of the pressure that self detected into the change of resistance, and at this moment, the voltage difference signal is the resistance variation of the inside resistance of pressure sensor 2 and the current value through pressure transformer, and wherein, the current value through pressure transformer is the constant current of fortune power supply 1 output promptly.
The voltage differential signal output by the pressure sensor 2 according to the constant current driving characteristic of the pressure sensor 2 is:
wherein, Vo is the voltage difference signal, Vopo is the voltage value of the output end of the operational amplifier power supply 1, R is the resistance value of the pressure sensor 2 when not subjected to the pressure change, Iref is the constant current output by the operational amplifier power supply 1, and Δ R is the resistance variation of the voltage dependent resistor when subjected to the pressure change.
Referring to fig. 3, fig. 3 is an internal circuit diagram of a pressure sensor according to the present invention, in an ideal case, if an internal bridge of the pressure sensor 2 is equivalent to 4 equivalent resistors (R1, R2, R3, and R4), all of the four equivalent resistors increase (decrease) with temperature, corresponding resistance values all increase (decrease), and the resistance value variation amounts are the same. Then, assuming that the resistance value of each equivalent resistor increases by Δ RT when the temperature increases by Δ T, then:
it can be seen that although the resistance inside the pressure transformer is caused to change when subjected to temperature changes, the result of the pressure differential signal is independent of Δ RT and only dependent on the constant current Iref and the resistance change Δ R due to pressure changes.
In summary, the calculation method in the present application can calculate the value of the voltage difference signal, and the voltage difference signal will not be changed due to the resistance change of the pressure sensor 2 caused by the temperature, and the calculation method is simple and easy to implement. As a preferred embodiment, the constant current is a fixed voltage/resistance of the reference resistor 3.
Due to the principle of virtual short and virtual disconnection of the operational amplifier power supply 1, at this time, the voltages of the input positive terminal and the input negative terminal of the operational amplifier power supply 1 can be considered to be equal, that is, the voltage value of the first end of the reference resistor 3 is equal to the voltage value of the input positive terminal of the operational amplifier power supply 1, and since the input positive terminal of the operational amplifier power supply 1 is a fixed voltage input, the second end of the reference resistor 3 is grounded, and the reference resistor 3 is connected in series with the pressure sensor 2, the constant current can be expressed as the resistance value of the fixed voltage/reference resistor 3.
As a preferred embodiment, obtaining a measurement signal with a constant current eliminated based on the voltage differential signal and a reference voltage includes:
obtaining a measurement signal for eliminating the constant current through a first relational expression based on the voltage differential signal and the reference voltage;
the first relation is:
wherein, VoFor voltage differential signals, VrefFor reference voltage,. DELTA.R is the pressure change, RcIs the resistance value of the reference resistor 3, IrefFor constant current, k is 1/resistance of reference resistor 3, and k Δ R is the measurement signal.
The relation in the above embodiment is substituted into the relation for calculating the voltage difference signal, and the temperature influence quantity of the constant current is eliminated, so as to obtain a measuring signal independent of the constant current. That is, in the constant current driving method, the change in the output voltage is related only to the amount of change Δ R in the resistance of the pressure sensor 2 according to the pressure, the reference resistance 3Rc, and the reference voltage Vref, and is not related to the temperature and the constant current Iref related to the temperature.
It should be noted that, in the present application, the ratio of Vo to the reference voltage Vref may be used as a new measurement signal, and the blood pressure value is calculated based on the measurement signal; it is also possible to use Vo as the measurement signal, i.e. the output Vo＝k*ΔR*VrefHowever, the constant current Iref is still not included, so that when the blood pressure value is calculated based on Vo obtained in the present application, the accuracy of the blood pressure value measurement is higher, and when the blood pressure value is calculated by directly using Vo in the present application, the algorithm in the processor 4 does not need to be changed, and the calculation method of calculating the blood pressure value by using the voltage difference signal in the prior art is still used.
In summary, when the blood pressure value is measured, the blood pressure value is calculated according to the voltage difference signal output by the pressure sensor 2, and the reference voltage of the first end of the reference resistor 3 is also collected and then combined to obtain a measurement signal for eliminating the constant current. When the blood pressure value is calculated based on the measurement signal, even if the constant current output by the operational amplifier power supply 1 fluctuates due to the influence of temperature or other factors on the operational amplifier power supply 1, the measurement signal does not contain a variable related to the constant current output by the operational amplifier power supply 1, so that the measurement signal is not influenced by temperature, and the blood pressure measurement precision is improved when the blood pressure is measured.
As a preferred embodiment, obtaining a measurement signal with a constant current eliminated based on the voltage differential signal and a reference voltage includes:
converting the voltage differential signal from analog quantity to digital quantity to obtain a voltage differential signal of the digital quantity;
converting the reference voltage from analog quantity to digital quantity to obtain reference voltage of the digital quantity;
obtaining a digital measurement signal without constant current based on the digital voltage differential signal and the digital reference voltage;
calculating a blood pressure value based on the measurement signal, comprising:
the blood pressure value of the digital quantity is calculated based on the measurement signal of the digital quantity, and the blood pressure value of the digital quantity is converted into an analog quantity.
Considering that the processor 4 for calculation can generally only process digital signals, the present application obtains the voltage differential signal and the reference voltage, and then converts the voltage differential signal and the reference voltage into a digital voltage differential signal and a digital reference voltage, respectively, so that the processor 4 obtains a digital measurement signal without constant current based on the two digital signals, calculates a blood pressure value based on the digital measurement signal, converts the blood pressure value into an analog value, and displays the analog value.
In summary, the two signals are converted from analog to digital in this embodiment so that the processor 4 can calculate the blood pressure value based on the reference voltage and the voltage difference signal of the digital.
Referring to fig. 4, fig. 4 is a structural block diagram of a blood pressure measuring system provided by the present invention, the system is applied to a sphygmomanometer, the sphygmomanometer includes an operational amplifier power supply 1, a pressure sensor 2 and a reference resistor 3, wherein an input positive terminal of the operational amplifier power supply 1 is connected to a power supply outputting a fixed voltage, an input negative terminal of the operational amplifier power supply 1 is respectively connected to a first terminal of the reference resistor 3 and one terminal of the pressure sensor 2, an output terminal of the operational amplifier power supply 1 is connected to the other terminal of the pressure sensor 2, and a second terminal of the reference resistor 3 is grounded;
the system comprises:
a first acquisition unit 5 configured to acquire a voltage differential signal output by the pressure sensor 2;
a second obtaining unit 6 for obtaining a voltage of the first terminal of the reference resistor 3 as a reference voltage;
a first calculation unit 7, configured to obtain a measurement signal with a constant current eliminated based on the voltage differential signal and a reference voltage;
a second calculation unit 8 for calculating a blood pressure value based on the measurement signal.
For solving the above technical problem, the present application further provides a blood pressure measuring system, and please refer to the above embodiments for the introduction of the blood pressure measuring system provided by the present application, which is not described herein again.
Referring to fig. 5, fig. 5 is a block diagram of a blood pressure measuring device provided in the present invention, the device includes:
a memory 9 for storing a computer program;
a processor 4 for implementing the steps of the blood pressure measurement method described above when executing a computer program.
For the introduction of the blood pressure measuring device provided by the present application, please refer to the above embodiments, which are not repeated herein.
A sphygmomanometer comprises the blood pressure measuring device, an operational amplifier power supply 1 for outputting constant current, a pressure sensor 2 and a reference resistor 3;
the input positive end of the operational amplifier power supply 1 is connected with a power supply for outputting fixed voltage, the input negative end of the operational amplifier power supply 1 is connected with the first end of the reference resistor 3 and one end of the pressure sensor 2 respectively, the output end of the operational amplifier power supply 1 is connected with the other end of the pressure sensor 2, the second end of the reference resistor 3 is grounded, and the first end of the reference resistor 3 and the output end of the pressure sensor 2 are connected with the first input end and the second output end of the blood pressure measuring device respectively.
As shown in fig. 2, the AVDDR in the figure is a power supply in the present application, and provides power for the operational amplifier power supply 1 and the analog-to-digital conversion module.
The present application provides a specific embodiment to explain values of each part in a circuit, where AVVDR of a voltage output by a power supply in the present application is 3V, a fixed voltage of an input positive terminal of an operational amplifier power supply 1 is 0.3V, a resistance of a reference voltage is 1.6 kohm, a feedback voltage of a first terminal of the reference voltage is 0.3V, and a constant current output by an operational amplifier module is 0.1875mA
As a preferred embodiment, the method further comprises the following steps:
the first end voltage measuring module of the reference resistor 3 is used for measuring the voltage value of the first end of the reference resistor 3;
the analog-digital conversion module is used for converting the reference voltage from analog quantity to digital quantity and converting the voltage differential signal from analog quantity to digital quantity, and the first input end of the analog-digital conversion module is connected with the output end of the voltage measurement module, and the second input end of the analog-digital conversion module is connected with the output end of the pressure sensor 2.
Considering that the processor 4 for calculation can generally only process digital signals, the processor 4 may not include an analog-to-digital conversion part, or the analog-to-digital conversion part is damaged, and therefore the analog-to-digital conversion cannot be performed, and the sphygmomanometer cannot be used.
In order to solve the technical problem, an analog-to-digital conversion module is arranged between the output end of the voltage measurement module and the output end of the pressure sensor 2 and the processor 4, and converts the voltage differential signal and the reference voltage into a digital voltage differential signal and a digital reference voltage respectively, so that the processor 4 obtains a digital measurement signal without constant current based on the two digital signals, calculates a blood pressure value based on the digital measurement signal, converts the blood pressure value into an analog quantity and displays the analog quantity.
In summary, in the embodiment, the analog-to-digital conversion module improves the reliability of converting the two signals from analog to digital.
As a preferred embodiment, the method further comprises the following steps:
the first input end is connected with the first end of the reference resistor 3, the second input end is connected with the output end of the pressure sensor 2, the first output end is connected with the first input end of the analog-to-digital conversion module, and the second input end is connected with the second input end of the analog-to-digital conversion module.
Considering that when the voltage differential signal and the reference voltage are directly analog-to-digital converted, the voltage differential signal and/or the reference voltage may not be within the output range of the analog-to-digital conversion module, so that the conversion from the analog quantity to the digital quantity cannot be realized.
In order to solve the technical problem, the input end of the analog-to-digital conversion module is further provided with an amplification module for amplifying the reference voltage and the voltage differential signal so as to enable the reference voltage and the voltage differential signal to reach the input range of the analog-to-digital conversion module, and the reliability of measuring the blood pressure value is improved. In addition, the amplification factor of the amplification module in the present application may be, but is not limited to, 16 times. When the analog-to-digital conversion module has 16 precision, the value of the corresponding full-scale analog-to-digital conversion module with 16 precision is 32768.
For other specific descriptions of the sphygmomanometer provided by the present application, please refer to the above method embodiments, and the details of the present application are not repeated herein.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A blood pressure measuring method is applied to a sphygmomanometer and is characterized in that the sphygmomanometer comprises an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the operational amplifier power supply outputs constant current, the positive input end of the operational amplifier power supply is connected with a power supply which outputs fixed voltage, the negative input end of the operational amplifier power supply is respectively connected with the first end of the reference resistor and one end of the pressure sensor, the output end of the operational amplifier power supply is connected with the other end of the pressure sensor, and the second end of the reference resistor is grounded;
the method comprises the following steps:
acquiring a voltage differential signal output by the pressure sensor;
acquiring the voltage of a first end of the reference resistor, and taking the voltage as a reference voltage;
obtaining a measurement signal for eliminating the constant current based on the voltage differential signal and the reference voltage;
a blood pressure value is calculated based on the measurement signal.
2. The method for measuring blood pressure according to claim 1, wherein the voltage difference signal is the amount of change in resistance of a resistor inside the pressure sensor.
3. The method of measuring blood pressure according to claim 2, wherein the constant current value is the resistance value of the fixed voltage/the reference resistor.
4. The method for measuring blood pressure according to claim 3, wherein obtaining a measurement signal from which the constant current is eliminated based on the voltage difference signal and the reference voltage comprises:
converting the voltage differential signal from analog quantity to digital quantity to obtain a voltage differential signal of the digital quantity;
converting the reference voltage from analog quantity to digital quantity to obtain reference voltage of digital quantity;
obtaining a digital measurement signal for eliminating the constant current based on the digital voltage difference signal and a digital reference voltage;
calculating a blood pressure value based on the measurement signal, comprising:
the blood pressure value of the digital quantity is calculated based on the measurement signal of the digital quantity, and the blood pressure value of the digital quantity is converted into an analog quantity.
5. The method for measuring blood pressure according to claim 3, wherein obtaining a measurement signal from which the constant current is eliminated based on the voltage difference signal and the reference voltage comprises:
obtaining a measurement signal for eliminating the constant current through a first relational expression based on the voltage differential signal and the reference voltage;
the first relation is:
wherein, VoFor said voltage differential signal, VrefFor the reference voltage, Δ R is a resistance variation amount of a resistor inside the pressure sensor, RcIs the resistance value of the reference resistor, IrefK is the constant current, k is 1/resistance of the reference resistor, and k Δ R is the measurement signal.
6. A blood pressure measuring system is applied to a sphygmomanometer and is characterized by comprising an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the positive input end of the operational amplifier power supply is connected with a power supply for outputting fixed voltage, the negative input end of the operational amplifier power supply is respectively connected with the first end of the reference resistor and one end of the pressure sensor, the output end of the operational amplifier power supply is connected with the other end of the pressure sensor, and the second end of the reference resistor is grounded;
the system comprises:
the first acquisition unit is used for acquiring a voltage differential signal output by the pressure sensor;
the second acquisition unit is used for acquiring the voltage of the first end of the reference resistor and taking the voltage as a reference voltage;
a first calculation unit configured to obtain a measurement signal from which the constant current is eliminated based on the voltage differential signal and the reference voltage;
a second calculation unit for calculating a blood pressure value based on the measurement signal.
7. A blood pressure measuring device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of the blood pressure measurement method according to any one of claims 1-5 when executing the computer program.
8. A sphygmomanometer comprising the blood pressure measuring apparatus according to claim 7, further comprising an operational amplifier power supply that can output a constant current, a pressure sensor, and a reference resistor;
the input positive end of the operational amplifier power supply is connected with the power supply for outputting fixed voltage, the input negative end of the operational amplifier power supply is respectively connected with the first end of the reference resistor and one end of the pressure sensor, the output end of the operational amplifier power supply is connected with the other end of the pressure sensor, the second end of the reference resistor is grounded, and the first end of the reference resistor and the output end of the pressure sensor are respectively connected with the first input end and the second output end of the blood pressure measuring device.
9. The sphygmomanometer of claim 8, further comprising:
the voltage measuring module is connected with the first end of the reference resistor and is used for measuring the voltage value of the first end of the reference resistor;
the first input end of the analog-to-digital conversion module is connected with the output end of the voltage measurement module, and the second input end of the analog-to-digital conversion module is connected with the output end of the pressure sensor and used for converting the reference voltage from analog quantity to digital quantity and converting the voltage differential signal from analog quantity to digital quantity.
10. A sphygmomanometer according to any one of claims 8 to 9, further comprising:
the first input end of the reference resistor is connected with the first end of the reference resistor, the second input end of the reference resistor is connected with the output end of the pressure sensor, the first output end of the reference resistor is connected with the first input end of the analog-to-digital conversion module, and the second input end of the reference resistor is connected with the second input end of the analog-to-digital conversion module.
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| CN115014629A (en) * | 2022-06-15 | 2022-09-06 | 广东乐心医疗电子股份有限公司 | Temperature drift compensation method and device for pressure sensor |
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