CN113017588B - Blood pressure measuring method, system, device and sphygmomanometer - Google Patents
Blood pressure measuring method, system, device and sphygmomanometer Download PDFInfo
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- A61B5/02—Detecting, measuring or recording pulse, heart rate, blood pressure or blood flow; Combined pulse/heart-rate/blood pressure determination; Evaluating a cardiovascular condition not otherwise provided for, e.g. using combinations of techniques provided for in this group with electrocardiography or electroauscultation; Heart catheters for measuring blood pressure
- A61B5/021—Measuring pressure in heart or blood vessels
- A61B5/022—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers
- A61B5/0225—Measuring pressure in heart or blood vessels by applying pressure to close blood vessels, e.g. against the skin; Ophthalmodynamometers the pressure being controlled by electric signals, e.g. derived from Korotkoff sounds
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
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Abstract
The invention discloses a blood pressure measuring method, in the scheme, besides calculating a blood pressure value according to a voltage differential signal output by a pressure sensor, the reference voltage of a first end of a reference resistor is acquired, and then the reference voltage and the reference voltage are combined to obtain a measuring signal for eliminating constant current. The application also discloses a blood pressure measuring system, a blood pressure measuring device and a blood pressure meter, and the blood pressure measuring system and the blood pressure meter have the same beneficial effects as the blood pressure measuring method.
Description
Technical Field
The present invention relates to the field of blood pressure measurement, and in particular, to a blood pressure measurement method, system, device, and 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 electric signal is calculated to obtain the measured blood pressure value.
Specifically, the sphygmomanometer further comprises a processor, the input end of the pressure sensor is connected with an operation and discharge source capable of outputting constant current, when the pressure sensor measures the blood pressure of a user, the sensed pressure change is converted into the change of a resistance value, and then a corresponding voltage differential signal is output based on the change of the resistance value, the processor can calculate the blood pressure value of the user based on the voltage differential signal, wherein the voltage differential signal=the change of the resistance value of the resistance inside the pressure sensor is equal to the constant current value output by the operation and discharge source through the current value of the pressure sensor. However, the output constant current may fluctuate due to the influence of temperature or other factors, and at this time, the voltage differential signal may also fluctuate adaptively with the fluctuation of the constant current value, so that if the blood pressure value of the user is still calculated according to the voltage differential signal, an inaccurate measurement result may occur.
Disclosure of Invention
The invention aims to provide a blood pressure measuring method, a system, a device and a sphygmomanometer, which are free from temperature influence 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 blood pressure meter, wherein the blood pressure meter comprises an operational amplifier power supply for outputting constant current, a pressure sensor and a reference resistor, wherein the input positive end of the operational amplifier power supply is connected with a 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, 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 the first end of the reference resistor and taking the voltage as a reference voltage;
obtaining a measurement signal eliminating the constant current based on the voltage differential signal and the reference voltage;
and calculating a blood pressure value based on the measurement signal.
Preferably, the voltage differential signal=the amount of change in resistance of the resistor inside the pressure sensor is the constant current.
Preferably, the constant current=the fixed voltage/the resistance value of the reference resistor.
Preferably, obtaining a measurement signal that cancels 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 digital quantity;
converting the reference voltage from analog quantity to digital quantity to obtain reference voltage of digital quantity;
obtaining a digital magnitude measurement signal that cancels the constant current based on the digital magnitude differential voltage signal and a digital magnitude reference voltage;
calculating a blood pressure value based on the measurement signal, comprising:
and calculating the digital blood pressure value based on the digital measurement signal, and converting the digital blood pressure value into an analog quantity.
Preferably, obtaining a measurement signal that cancels 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 relation based on the voltage differential signal and the reference voltage;
the first relation is:
wherein V is o For the voltage differential signal, V ref For the reference voltage, ΔR is the resistance change of the resistor inside the pressure sensor, R c I is the resistance of the reference resistor ref For the constant current, k is 1/resistance of the reference resistor, and k×Δr is the measurement signal.
In order to solve the technical problems, the invention also provides a blood pressure measuring system which is applied to a blood pressure meter, wherein the blood pressure meter comprises an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the input positive end of the operational amplifier power supply is connected with a 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, 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 for obtaining a measurement signal for eliminating the constant current based on the voltage differential signal and the reference voltage;
and a second calculation unit for calculating a blood pressure value based on the measurement signal.
In order to solve the above technical problems, the present invention further provides a blood pressure measurement device, including:
a memory for storing a computer program;
and the processor is used for realizing the steps of the blood pressure measuring method when executing the computer program.
In order to solve the technical problems, the invention also provides a sphygmomanometer, which comprises the blood pressure measuring device, an operational amplifier source capable of outputting constant current, a pressure sensor and a reference resistor;
the input positive end of the operational amplifier is connected with a power supply for outputting fixed voltage, the input negative end of the operational amplifier 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 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 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 is connected with the output end of the voltage measuring module, and the second input end is connected with the analog-to-digital conversion module of the output end of the pressure sensor and 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.
Preferably, the method further comprises:
the first input end is connected with the first end of the reference resistor, the second input end is connected with the output end of the pressure sensor, 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 and is used for amplifying the reference voltage and the voltage differential signal so that the reference voltage and the voltage differential signal reach the input range of the analog-to-digital conversion module.
In the scheme, besides calculating the blood pressure value according to the voltage differential signal output by the pressure sensor, the reference voltage at the first end of the reference resistor is acquired, and then the reference voltage and the reference voltage are combined to obtain a measurement signal for eliminating constant current.
The application also provides a blood pressure measuring system, a blood pressure measuring device and a blood pressure meter, and the blood pressure measuring system and the blood pressure meter have the same beneficial effects as the blood pressure measuring method.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required in the prior art and the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a blood pressure measurement method according to the present invention;
FIG. 2 is a schematic diagram of a circuit of a sphygmomanometer according to the present invention;
FIG. 3 is an internal circuit diagram of a pressure sensor provided by the present invention;
FIG. 4 is a block diagram of a blood pressure measurement 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 affected by temperature when measuring blood pressure, and improve the accuracy of blood pressure measurement.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a blood pressure measurement method provided by the invention, which is applied to a blood pressure meter, wherein the blood pressure meter comprises an operational amplifier 1 outputting constant current, a pressure sensor 2 and a reference resistor 3, wherein an input positive end of the operational amplifier 1 is connected with a power supply outputting fixed voltage, an input negative end of the operational amplifier 1 is respectively connected with a first end of the reference resistor 3 and one end of the pressure sensor 2, an output end of the operational amplifier 1 is connected with 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 the first end of the reference resistor 3 and taking the voltage as a reference voltage;
s13: obtaining a measurement signal for eliminating 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 schematic circuit diagram of a sphygmomanometer according to the present invention. For such a circuit diagram, if the blood pressure value is measured according to the prior art, that is, the voltage differential signal output by the pressure sensor 2 is taken as a measurement signal, the blood pressure value is calculated based on the measurement signal, and since the voltage differential signal output by the pressure sensor 2 is the product of the resistance variable in the pressure sensor 2 and the constant current output by the operational discharge source 1, when the constant current changes due to temperature or other factors, the corresponding voltage differential signal and the corresponding blood pressure value change, resulting in inaccurate obtained blood pressure value. In order to solve the technical problem, the design idea of the circuit is to introduce other signals in the circuit, so that when the signals are combined with the voltage differential signals, the variable of constant current in the voltage differential signals can be eliminated, and a new measurement signal irrelevant to the constant current is obtained. Because the new measurement signal does not contain the constant current, when the constant current changes, the measurement signal does not change correspondingly, thereby improving the accuracy of the blood pressure value.
Based on the above, the reference voltage of the first end of the reference resistor 3Rc is obtained while the voltage differential signal is obtained, and the voltage differential signal and the reference voltage are combined to obtain the measurement signal for eliminating the constant current, so that inaccurate blood pressure value caused by the change of the constant current can be avoided when the blood pressure value is calculated based on the measurement signal, and the stability of measuring the blood pressure value is improved.
In summary, when calculating the blood pressure value based on the measurement signal in the present application, even if the constant current output by the operational amplifier 1 fluctuates due to the influence of temperature or other factors, the measurement signal does not include the variable related to the constant current output by the operational amplifier 1, so that the measurement signal is not affected by temperature, and the accuracy of blood pressure measurement is improved when measuring blood pressure
Based on the above embodiments:
as a preferred embodiment, the voltage differential signal=constant current is the resistance change amount of the resistor inside the pressure sensor 2.
The application aims to provide a specific calculation formula of a voltage differential signal output by pressure sensing, specifically, when the pressure sensor 2 is a resistive sensor, the pressure sensor 2 comprises a piezoresistor, when blood pressure is measured, the piezoresistor converts pressure change detected by the piezoresistor into resistance change, at this time, the voltage differential signal is resistance change quantity of a resistor inside the pressure sensor 2 and a current value passing through a pressure transformer, wherein the current value passing through the pressure transformer is constant current output by the operational amplifier 1.
The voltage differential signal output by the pressure sensor 2 is obtained according to the constant current driving characteristic of the pressure sensor 2:
where Vo is a voltage differential signal, vopo is a voltage value of an output end of the operational amplifier 1, R is a resistance value of the pressure sensor 2 when no pressure is changed, iref is a constant current output by the operational amplifier 1, and Δr is a resistance change amount of the piezoresistor when the pressure is changed.
Referring to fig. 3, fig. 3 is an internal circuit diagram of a pressure sensor according to the present invention, if an internal bridge of the pressure sensor 2 is ideally equivalent to 4 equivalent resistors (R1, R2, R3 and R4), the four equivalent resistors all increase (decrease) with temperature, the corresponding resistance values all increase (decrease), and the resistance value variation amounts are the same. Then, assuming that the temperature increases by Δt, the resistance value of each equivalent resistor increases by Δrt, then:
it can be seen that when a temperature change is applied, the resistance value inside the pressure transformer is changed, but the result of the pressure differential signal is independent of Δrt, and only the constant current Iref and the resistance value change amount Δr due to the pressure change are related.
In summary, the calculation method in the present application can calculate the value of the voltage differential signal, and the voltage differential signal cannot be changed due to the resistance change of the pressure sensor 2 caused by temperature, and the calculation method is simple and easy to implement. As a preferred embodiment, constant current = fixed voltage/resistance of reference resistor 3.
Because of the principle of the weak short and weak break of the operational amplifier 1, at this time, the voltages of the input positive terminal and the input negative terminal of the operational amplifier 1 may be considered to be equal, that is, the voltage value of the first terminal of the reference resistor 3 is equal to the voltage value of the input positive terminal of the operational amplifier 1, and because the input positive terminal of the operational amplifier 1 is a fixed voltage input, the second terminal of the reference resistor 3 is grounded, and the reference resistor 3 is connected in series with the pressure sensor 2, a constant current may be represented as a fixed voltage/the resistance value of the reference resistor 3.
As a preferred embodiment, obtaining a measurement signal that cancels a constant current based on a voltage differential signal and a reference voltage includes:
obtaining a measurement signal for eliminating constant current through a first relation based on the voltage differential signal and the reference voltage;
the first relation is:
wherein V is o As voltage differential signal, V ref For reference voltage, ΔR is the pressure variation, R c I is the resistance of the reference resistor 3 ref For constant current, k is 1/resistance of the reference resistor 3, and k×Δr is the measurement signal.
The relation in the above embodiment is taken into the relation for calculating the voltage differential signal, and a temperature influence of the constant current is eliminated to obtain a measurement signal irrelevant to the constant current. That is, in the constant current drive mode, the change in the output voltage is related to only the resistance change amount Δr of the pressure sensor 2 according to the pressure, the reference resistance 3Rc, and the reference voltage Vref, and is independent of 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 may be calculated based on the measurement signal; it is also possible to use Vo as the measurement signal, i.e. output V o ＝k*ΔR*V ref The constant current Iref is not included, so that when the blood pressure value is calculated based on Vo obtained in the application, the accuracy of blood pressure value measurement is higher, and when the blood pressure value is calculated by directly using Vo in the 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 differential signal in the prior art is only needed.
In summary, in measuring the blood pressure value, the present application acquires the reference voltage at the first end of the reference resistor 3 in addition to calculating the blood pressure value from the voltage differential signal output from the pressure sensor 2, and then combines the two to obtain a measurement signal for eliminating the constant current. When calculating the blood pressure value based on the measurement signal, even if the constant current output by the operational amplifier 1 fluctuates due to the influence of temperature or other factors, the measurement signal does not contain the variable related to the constant current output by the operational amplifier 1, so the measurement signal is not affected by temperature, and the accuracy of blood pressure measurement is improved when measuring the blood pressure.
As a preferred embodiment, obtaining a measurement signal that cancels a constant current based on a 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 digital quantity;
converting the reference voltage from analog quantity to digital quantity to obtain the reference voltage of the digital quantity;
obtaining a digital quantity measurement signal eliminating constant current based on the digital quantity voltage differential signal and the digital quantity reference voltage;
calculating a blood pressure value based on the measurement signal, comprising:
and calculating the digital blood pressure value based on the digital measurement signal, and converting the digital blood pressure value into an analog quantity.
In view of the fact that the processor 4 for calculation is generally only capable of processing digital signals, the present application, after acquiring the voltage differential signal and the reference voltage, converts them into digital voltage differential signal and digital reference voltage, respectively, so that the processor 4 obtains digital measurement signals for eliminating constant current based on the two digital signals, calculates blood pressure values based on the digital measurement signals, and converts them into analog signals for display.
In summary, in the present embodiment, the above two signals are converted from analog to digital 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 block diagram of a blood pressure measurement system provided by the present invention, the system is applied to a blood pressure meter, the blood pressure meter includes an operational amplifier 1, a pressure sensor 2 and a reference resistor 3, wherein an input positive terminal of the operational amplifier 1 is connected to a power source outputting a fixed voltage, an input negative terminal of the operational amplifier 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 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 for acquiring a voltage differential signal output from the pressure sensor 2;
a second acquisition unit 6 for acquiring a voltage of a first end of the reference resistor 3 and serving as a reference voltage;
a first calculation unit 7 for obtaining a measurement signal for eliminating a constant current based on the voltage differential signal and the reference voltage;
a second calculation unit 8 for calculating a blood pressure value based on the measurement signal.
In order to solve the above technical problems, the present application further provides a blood pressure measurement system, and for the introduction of the blood pressure measurement system provided in the present application, reference is made to the above embodiments, and the description of the present application is omitted herein.
Referring to fig. 5, fig. 5 is a block diagram of a blood pressure measuring apparatus according to the present invention, the apparatus 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 the computer program.
In order to solve the above technical problems, the present application further provides a blood pressure measuring device, and for the introduction of the blood pressure measuring device provided in the present application, reference is made to the above embodiments, and the description of the present application is omitted herein.
The 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 1 is connected with a power supply for outputting fixed voltage, the input negative end of the operational amplifier 1 is respectively connected with a first end of the reference resistor 3 and one end of the pressure sensor 2, the output end of the operational amplifier 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 respectively connected with a first input end and a second output end of the blood pressure measuring device.
As shown in fig. 2, AVDDR in the figure is a power supply in the present application, and provides power for the operational amplifier 1 and the analog-to-digital conversion module.
The present application provides a specific embodiment to illustrate the value of each part in a circuit, wherein the voltage AVVDR output by the power supply in the application is 3V, the fixed voltage at the input positive end of the operational amplifier 1 is 0.3V, the resistance of the reference voltage is 1.6 kilo-ohms, the feedback voltage at the first end of the reference voltage is 0.3V, and the constant current output by the operational amplifier module is 0.1875mA
As a preferred embodiment, further comprising:
a voltage measuring module connected with the first end of the reference resistor 3 and used for measuring the voltage value of the first end of the reference resistor 3;
the first input end is connected with the output end of the voltage measuring module, and the second input end is connected with the analog-to-digital conversion module of the output end of the pressure sensor 2 and 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.
Considering that the processor 4 for calculation is generally only capable of processing signals of digital magnitude, the processor 4 may not include an analog-to-digital conversion portion, or the analog-to-digital conversion portion is damaged, and so on, and thus cannot perform analog-to-digital conversion, which is not usable by the sphygmomanometer.
In order to solve the above technical problems, an analog-to-digital conversion module is disposed between the output end of the voltage measurement module and the output end of the pressure sensor 2 and the processor 4, and the voltage differential signal and the reference voltage are respectively converted into a digital voltage differential signal and a digital reference voltage, so that the processor 4 obtains a digital measurement signal for eliminating constant current based on the two digital signals, calculates a blood pressure value based on the digital measurement signal, and converts the blood pressure value into an analog value for display.
In summary, the reliability of converting the above two signals from analog to digital is improved by the analog-to-digital conversion module in this embodiment.
As a preferred embodiment, further comprising:
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 and is used 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.
Considering that the voltage differential signal and the reference voltage are directly subjected to analog-to-digital conversion, there may be a case that the voltage differential signal and/or the reference voltage are not within the output range of the analog-to-digital conversion module, so that the conversion from analog quantity to 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 amplifying module for amplifying the reference voltage and the voltage differential signal so that the reference voltage and the voltage differential signal reach the input range of the analog-to-digital conversion module, and the reliability of measuring the blood pressure value is improved. Further, the magnification of the magnification module in the present application may be, but is not limited to, 16 times. When the analog-to-digital conversion module is 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 in the present application, please refer to the above method embodiments, and the description is omitted herein.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It should also be noted that in this 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. Moreover, 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 one … …" does not exclude the presence of other like 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 (7)
1. The blood pressure measuring system is applied to a blood pressure meter and is characterized by comprising an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the input positive end of the operational amplifier power supply is connected with a 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, 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 for obtaining a measurement signal for eliminating the constant current 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;
the voltage differential signal=the constant current, the resistance change amount of the resistor inside the pressure sensor;
the constant current value = the fixed voltage/the resistance value of the reference resistor;
the first calculating unit is specifically configured to obtain 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: v_o/v_ref= (Δr i_ref)/(r_c i_ref) =Δr/r_c=k Δr;
wherein v_o is the voltage differential signal, v_ref is the reference voltage, Δr is the resistance variation of the resistor inside the pressure sensor, r_c is the resistance of the reference resistor, i_ref is the constant current, k is 1/the resistance of the reference resistor, and k×Δr is the measurement signal.
2. The blood pressure measurement system of claim 1, wherein the first computing unit is specifically configured to convert the voltage differential signal from an analog quantity to a digital quantity, and 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 magnitude measurement signal that cancels the constant current based on the digital magnitude differential voltage signal and a digital magnitude reference voltage;
the second calculating unit is specifically configured to calculate a digital blood pressure value based on the digital measurement signal, and convert the digital blood pressure value into an analog value.
3. The blood pressure measuring device is characterized by being applied to a blood pressure meter, and comprises an operational amplifier power supply, a pressure sensor and a reference resistor, wherein the input positive end of the operational amplifier power supply is connected with a 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, and the second end of the reference resistor is grounded; the blood pressure measuring device includes:
a memory for storing a computer program;
a processor for implementing the steps of a blood pressure measurement method when executing the computer program, the method comprising:
acquiring a voltage differential signal output by the pressure sensor;
acquiring the voltage of the first end of the reference resistor and taking the voltage as a reference voltage;
obtaining a measurement signal eliminating the constant current based on the voltage differential signal and the reference voltage;
calculating a blood pressure value based on the measurement signal;
the voltage differential signal=the constant current, the resistance change amount of the resistor inside the pressure sensor;
the constant current value = the fixed voltage/the resistance value of the reference resistor;
obtaining a measurement signal that cancels the constant current based on the voltage differential signal and the reference voltage, comprising:
obtaining a measurement signal for eliminating the constant current through a first relation based on the voltage differential signal and the reference voltage;
the first relation is: v_o/v_ref= (Δr i_ref)/(r_c i_ref) =Δr/r_c=k Δr;
wherein v_o is the voltage differential signal, v_ref is the reference voltage, Δr is the resistance variation of the resistor inside the pressure sensor, r_c is the resistance of the reference resistor, i_ref is the constant current, k is 1/the resistance of the reference resistor, and k×Δr is the measurement signal.
4. The blood pressure measurement device of claim 3, wherein deriving the measurement signal that cancels the constant current based on the voltage differential signal and the reference voltage comprises:
converting the voltage differential signal from analog quantity to digital quantity to obtain a voltage differential signal of digital quantity;
converting the reference voltage from analog quantity to digital quantity to obtain reference voltage of digital quantity;
obtaining a digital magnitude measurement signal that cancels the constant current based on the digital magnitude differential voltage signal and a digital magnitude reference voltage;
calculating a blood pressure value based on the measurement signal, comprising:
and calculating the digital blood pressure value based on the digital measurement signal, and converting the digital blood pressure value into an analog quantity.
5. A sphygmomanometer, comprising the blood pressure measuring device according to claim 3, further comprising an operational amplifier source capable of outputting a constant current, a pressure sensor, and a reference resistor;
the input positive end of the operational amplifier is connected with a power supply for outputting fixed voltage, the input negative end of the operational amplifier 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 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.
6. The sphygmomanometer of claim 5, 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 is connected with the output end of the voltage measuring module, and the second input end is connected with the analog-to-digital conversion module of the output end of the pressure sensor and 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.
7. The sphygmomanometer of any one of claims 5-6, further comprising:
the first input end is connected with the first end of the reference resistor, the second input end is connected with the output end of the pressure sensor, 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 and is used for amplifying the reference voltage and the voltage differential signal so that the reference voltage and the voltage differential signal reach the input range of the analog-to-digital conversion module.
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| US5146788A (en) * | 1990-10-25 | 1992-09-15 | Becton, Dickinson And Company | Apparatus and method for a temperature compensation of a catheter tip pressure transducer |
| DE4211997A1 (en) * | 1992-04-09 | 1993-10-14 | Jaeger Erich Gmbh & Co Kg | Method and circuit arrangement for electrical compensation of the influence of temperature on the measurement signal from mechanoelectric transducers |
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