CN217793031U - Blood pressure detection circuit - Google Patents
Blood pressure detection circuit Download PDFInfo
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- CN217793031U CN217793031U CN202220078334.0U CN202220078334U CN217793031U CN 217793031 U CN217793031 U CN 217793031U CN 202220078334 U CN202220078334 U CN 202220078334U CN 217793031 U CN217793031 U CN 217793031U
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Abstract
The utility model provides a blood pressure detection circuit, include: the device comprises a preceding stage signal processing circuit, a control circuit, a first amplifying circuit and a first filter circuit; the control circuit comprises a triode, a first resistor, a second resistor and a third resistor; wherein, the one end of first resistance with the projecting pole of triode is connected, the other end of first resistance simultaneously with second filter circuit among the preceding stage signal processing circuit, first amplifier circuit's input is connected, the one end of second resistance simultaneously with the one end of third resistance the base of triode is connected, the other end ground connection of second resistance, the other end of third resistance is connected with the control pin of predetermineeing the singlechip, the collecting electrode of triode simultaneously with first filter circuit's input, first amplifier circuit's output is connected. The utility model discloses a circuit can effectively filtering atmospheric pressure oscillation interference signal, promotes blood pressure test circuit denoising's ability.
Description
Technical Field
The utility model relates to an information processing technology field especially relates to a blood pressure detection circuit.
Background
Blood pressure is the most important vital parameter of human health, and is an important basis for clinically diagnosing diseases, observing treatment effects and carrying out prognosis judgment. At present, the pressure of an electronic sphygmomanometer is commonly used for automatic non-invasive blood pressure detection, and the important parts of the electronic sphygmomanometer are a cuff air bag, a pressure sensor, an air pump electromagnetic valve and a controller. However, in the detection process, when the cuff air bag is deflated, air pressure oscillation is easily generated, noise interference is caused, and the collection of blood pressure signals is influenced.
In the prior art, noise interference generated by air pressure oscillation is solved by changing the air path structural design in the electronic sphygmomanometer or adopting a software algorithm and the like, however, the development cycle and cost of early-stage mold opening and injection molding are increased by changing the air path structural design, and the oscillation interference existing in the air path is difficult to avoid actually, and by adopting the software algorithm and the like, the software development cost is increased, and the complexity of software design is increased.
Therefore, how to better suppress the noise interference caused by the air pressure oscillation in the blood pressure detection process has become an urgent problem to be solved in the industry.
SUMMERY OF THE UTILITY MODEL
The utility model provides a blood pressure detection circuit for restrain the noise interference that atmospheric pressure vibrates and brings better in the blood pressure testing process.
The embodiment of the utility model provides a blood pressure detection circuit, include:
the device comprises a preceding stage signal processing circuit, a management and control circuit, a first amplifying circuit and a first filter circuit;
the control circuit comprises a triode, a first resistor, a second resistor and a third resistor;
wherein, the one end of first resistance with the projecting pole of triode is connected, the other end of first resistance simultaneously with second filter circuit among the preceding stage signal processing circuit, first amplifier circuit's input is connected, the one end of second resistance simultaneously with the one end of third resistance the base of triode is connected, the other end ground connection of second resistance, the other end of third resistance is connected with the control pin of predetermineeing the singlechip, the collecting electrode of triode simultaneously with first filter circuit's input, first amplifier circuit's output is connected.
According to the utility model discloses blood pressure detection circuit who provides still includes:
a second amplifying circuit;
the input end of the second amplifying circuit is connected with the collector electrode of the triode in the control circuit and the output end of the first amplifying circuit, and the output end of the second amplifying circuit is connected with the input end of the first filter circuit.
According to the utility model provides a pair of blood pressure check circuit, the other end of first resistance in the management and control circuit simultaneously with first amplifier circuit's output second amplifier circuit's input is connected, the collecting electrode of the triode in the management and control circuit simultaneously with second amplifier circuit's output first filter circuit's input is connected.
According to the embodiment of the present invention, a blood pressure detecting circuit is provided, wherein the preceding stage signal processing circuit comprises a piezoelectric signal collecting circuit, a third amplifying circuit, a following circuit and the second filter circuit;
the output end of the piezoelectric signal acquisition circuit is connected with the input end of the third amplifying circuit, the output end of the third amplifying circuit is connected with the input end of the following circuit, the output end of the following circuit is connected with the input end of the second filter circuit, and the output end of the second filter circuit is simultaneously connected with the input end of the first amplifying circuit and the other end of the first resistor in the control circuit.
According to the utility model discloses blood pressure check circuit who provides still includes:
a cuff pressure signal detection circuit;
the output end of the third amplifying circuit is connected with the input end of the cuff pressure signal detecting circuit.
According to the utility model discloses blood pressure detection circuit who provides still includes:
a reference voltage dividing circuit;
the reference voltage divider circuit comprises a first reference voltage output end, a second reference voltage output end, a third reference voltage output end and a fourth reference voltage output end;
the first reference voltage output end is connected with the third amplifying circuit, the second reference voltage output end is connected with the following circuit, the third reference voltage output end is connected with the first amplifying circuit, the third reference voltage output end is connected with the second amplifying circuit, and the fourth reference voltage output end is connected with the piezoelectric signal collecting circuit.
According to the embodiment of the present invention, the reference voltage dividing circuit further comprises a reference voltage source, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor;
the reference voltage source is connected with one end of the fourth resistor and one end of the eighth resistor, the other end of the fourth resistor is connected with one end of the second reference voltage output end and one end of the fifth resistor, the other end of the eighth resistor is connected with one end of the first reference voltage output end and one end of the ninth resistor, the other end of the ninth resistor is grounded, the other end of the fifth resistor is connected with one end of the third reference voltage output end and one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the fourth reference voltage output end and one end of the seventh resistor, and the other end of the seventh resistor is grounded.
According to the utility model provides a blood pressure detection circuit, the triode includes PNP type triode or NPN type triode.
The utility model provides a blood pressure detection circuit, through inserting the management and control circuit, predetermine the singlechip according to the steady state of gas circuit atmospheric pressure, adjust the route or the circuit break of management and control circuit, change the magnification of whole circuit; when the air circuit is in an air valve deflation state and the circuit generates air pressure oscillation interference signals, the singlechip is preset to input level signals to the control circuit, so that the control circuit is communicated, the amplification factor of deflation time period signals is reduced, the air pressure oscillation interference signals introduced into the circuit are effectively filtered, the denoising capability of the blood pressure detection circuit is improved, the effect is obvious, the operation is simple, and the time and the cost are saved.
Drawings
In order to illustrate the technical solutions of the present invention or the prior art more clearly, the drawings used in the following embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a system structure of a blood pressure detection circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a blood pressure detecting circuit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a preceding-stage signal processing circuit in the blood pressure detection circuit according to the embodiment of the present invention;
fig. 4 is a second schematic structural diagram of a blood pressure detecting circuit according to an embodiment of the present invention;
fig. 5 is a third schematic structural diagram of a blood pressure detecting circuit according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a reference voltage divider circuit in a blood pressure detection circuit according to an embodiment of the present invention;
fig. 7 is a fourth schematic structural diagram of a blood pressure detecting circuit provided by an embodiment of the present invention;
fig. 8 is a schematic diagram of an overall structure of a blood pressure detecting circuit according to an embodiment of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, the accompanying drawings of the present invention are combined below to clearly and completely describe the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
The blood pressure detection circuit of the present invention will be described with reference to fig. 1 to 8.
Fig. 1 is a schematic diagram of a system structure of a blood pressure detecting circuit provided in an embodiment of the present invention, as shown in fig. 1, including: the blood pressure monitoring device comprises a power module, a main control module, a key module, a display module, an air pump, an air valve module, a blood pressure acquisition module, a storage module and a communication module.
The power supply module is used for supplying power for normal work of each module;
the main control module can control the on and off of each power supply in the power supply module and is formed based on a preset singlechip;
the key module is a man-machine interaction platform, a user can trigger various functions of the electronic sphygmomanometer through keys, and the electronic sphygmomanometer identifies the keys through a preset single chip microcomputer;
the display module is used for displaying various display information sent by the preset single chip microcomputer, such as blood pressure measurement results, current time, current users, battery level, alarm states, network signal intensity, menu settings and the like.
The air pump and the air valve module are used in the blood pressure measuring process, the preset single chip controls the air pump to inflate the cuff, and controls the air valve to deflate the cuff;
the blood pressure acquisition module mainly comprises a pressure sensor and an analog amplification circuit, is used for acquiring a cuff pressure signal and a pulse wave signal generated by the air pressure in the cuff, and sends the cuff pressure signal and the pulse wave signal to an A/D sampling channel of a preset singlechip;
the communication module is used for realizing remote communication between the main control module and an upper computer, remotely logging in synchronous equipment time, transmitting blood pressure data and the like.
The storage module is connected with the main control module and used for storing and reading the word stock, the blood pressure measurement result and the like.
The main control module is connected with other modules, is a core control component of the electronic sphygmomanometer, and can complete functions of blood pressure algorithm, key identification, control display content, communication and the like through the prior art.
Fig. 2 is a schematic structural diagram of a blood pressure detecting circuit provided in an embodiment of the present invention, as shown in fig. 2, the circuit belongs to a circuit in the blood pressure collecting module, and includes a preceding stage signal processing circuit 1, a management and control circuit 2, a first amplifying circuit 3 and a first filter circuit 4;
in this embodiment, the management and control circuit 2 may include a transistor Q1, a first resistor R10, a second resistor R12, and a third resistor R13; the preceding stage signal processing circuit 1 includes a preceding stage signal processing sub-circuit and a second filter circuit 5.
One end of a first resistor R10 is connected with an emitting electrode of a triode Q1, the other end of the first resistor R10 is simultaneously connected with input ends of a second filter circuit 5 and a first amplifying circuit 3 in a preceding stage signal processing circuit 1, one end of a second resistor R12 is simultaneously connected with one end of a third resistor R13 and a base electrode of the triode Q1, the other end of the second resistor R12 is grounded, the other end of the third resistor R13 is connected with a control pin of a preset single chip microcomputer, and a collector electrode of the triode Q1 is simultaneously connected with an input end of the first filter circuit 4 and an output end of the first amplifying circuit 3;
the preset single chip microcomputer is used for sending a control signal to the control circuit through a control pin connected with the control circuit under the condition that the preceding-stage signal processing circuit does not generate an air pressure oscillation interference signal so as to control the control circuit to be in an open circuit state; under the condition that the front-stage signal processing circuit generates an air pressure oscillation interference signal, a control signal is sent to the control circuit through a control pin connected with the control circuit so as to control the control circuit to be in an access state, and the first amplifying circuit is in a short circuit state.
In the present embodiment, the first amplifying circuit 3 may include an operational amplifier U6, a capacitor C5, and resistors R9 and R11 for amplifying the piezoelectric signal output from the previous stage signal processing circuit; the first filter circuit 4 may include a resistor R16, a filter EA3, and a capacitor C6, and is configured to filter the amplified piezoelectric signal output by the first amplifier circuit, extract a pulse wave signal with a low frequency, and send the pulse wave signal to an a/D sampling channel of a preset single chip.
Specifically, one end of the first resistor R10 is connected to an emitter of the transistor Q1, the other end of the first resistor R10 is simultaneously connected to an output end of the second filter circuit 5 in the preceding-stage signal processing circuit 1 and one end of the resistor R11 in the first amplifier circuit 3, one end of the second resistor R12 is simultaneously connected to one end of the third resistor R13 and a base of the transistor Q1, the other end of the second resistor R12 is grounded, the other end of the third resistor R13 is connected to a control pin of a preset single chip, and a collector of the transistor Q1 is simultaneously connected to one end of the capacitor C5 in the first amplifier circuit 3, one end of the resistor R9, an output end of the operational amplifier U6, and one end of the R16 in the first filter circuit 4.
The embodiment of the utility model provides a described predetermine the singlechip for the inside singlechip that uses of the host system who has set up in advance, it can be used for in the stable or gassing in-process of sleeve area gasbag atmospheric pressure, to management and control circuit output control signal.
The utility model discloses an in the embodiment, the control signal of the control pin output of singlechip is predetermine through receiving to the management and control circuit, controls the break-make of triode.
The utility model discloses a preceding stage signal processing circuit is used for the atmospheric pressure analog signal conversion who gathers to electric analog signal, detects the piezoelectricity signal that contains the pulse wave signal.
In an embodiment of the present invention, the preceding stage signal processing circuit includes a piezoelectric signal collecting circuit, a third amplifying circuit, a follower circuit and a second filter circuit; namely, the preceding stage signal processing sub-circuit comprises a piezoelectric signal acquisition circuit, a third amplification circuit and a following circuit.
The embodiment of the utility model provides a piezoelectricity signal acquisition circuit described is used for the pressure signal conversion who gathers sleeve area gasbag atmospheric pressure to the analog signal of telecommunication, obtains piezoelectricity signal promptly.
The third amplifying circuit is used for amplifying the piezoelectric signal output by the piezoelectric signal acquisition circuit.
The embodiment of the utility model provides a follow circuit is used for restraining the interference of back level amplifier circuit to the weak signal of preceding stage.
The embodiment of the utility model provides a second filter circuit is used for filtering sleeve area pressure signal.
Fig. 3 is the structural schematic diagram of preceding stage signal processing circuit in blood pressure detection circuit that the embodiment provides, as shown in fig. 3, the output of piezoelectric signal acquisition circuit 6 links to each other with third amplifier circuit 7's input, and third amplifier circuit 7's output links to each other with follower circuit 8's input, and follower circuit 8's output links to each other with second filter circuit 5's input, second filter circuit 5's output simultaneously with the one end of resistance R11 in first amplifier circuit 3 the other end of first resistance R10 in the management and control circuit 3 is connected.
As shown in fig. 3, the piezoelectric signal acquisition circuit may include a pressure sensor and a reference constant current source, wherein the reference constant current source may include a resistor R1 and an operational amplifier U1; the third amplifying circuit may include operational amplifiers U2, U3, and U4, capacitors C1, C2, and C3, and resistors R2, R3, R4, R5, and R6; the follower circuit can comprise an operational amplifier U5, a capacitor C4 and resistors R7 and R8; the second filtering circuit comprises a filter EA2;
in this embodiment, the reference constant current source provides power for the pressure sensor, and is connected to two power input terminals of the pressure sensor, a positive signal output terminal of the pressure sensor is simultaneously connected to the non-inverting input terminals of the capacitor C2 and the capacitor C3 in the third amplifying circuit 7 and the operational amplifier U3, and a negative signal output terminal of the pressure sensor is simultaneously connected to the non-inverting input terminals of the capacitor C1 and the capacitor C3 in the third amplifying circuit 7 and the operational amplifier U2;
one end of a resistor R7 in the follower circuit 8 is simultaneously connected with the output end of an operational amplifier U4 in the third amplifying circuit 7 and one end of a resistor R5; the input end of the filter EA2 in the second filter circuit 5 is simultaneously connected to the output end of the operational amplifier U5 in the follower circuit 8, one end of the resistor R8, and one end of the capacitor C4.
In the present embodiment, for the third amplification circuit, according to the calculation formula of the operational amplifier, as follows:
wherein, V 0 Indicating the output voltage, V, of the third amplifying circuit out+ 、V out- Representing the differential input voltage of the third amplification circuit.
In a specific embodiment of the present invention, it is set that R2=24K Ω, R3=1K Ω, R4=10K Ω, R5 ≈ 9.09K Ω, and can be calculated according to the above formula, and the amplification factor of the third amplifying circuit is a 1 =0.909 × (1 + 48) ≈ 44.5 times.
Because the third amplifying circuit is a differential amplifying circuit, differential mode signals can be amplified, common mode signals can be inhibited, and when the input signals contain the common mode signals, the common mode signals can be inhibited.
In this embodiment, the piezoelectric signal is subjected to signal amplification by the third amplifying circuit, and the amplified piezoelectric signal is subjected to the follower circuit, so that the influence of the subsequent stage on the previous stage signal is effectively suppressed. In order to obtain the pulse wave signal, the piezoelectric signal is filtered by the second filter circuit, and after the cuff pressure signal is filtered, the pulse wave signal with mixed frequency can be obtained.
The utility model discloses blood pressure check circuit, preceding stage signal processing circuit include piezoelectric signal acquisition circuit, third amplifier circuit, follower circuit and second filter circuit, carry out signal processing through the gasbag pressure signal to gathering, can effectively acquire the pulse wave signal, calculate and provide signal data for follow-up blood pressure check.
When the air pressure of the air path is stable, namely the air valve is in a non-deflation state, the single chip microcomputer is preset to enable the control pin to continuously output a high level to the control circuit according to the inflation and deflation time threshold value set by the single chip microcomputer, at the moment, the triode Q1 is cut off, the control circuit is disconnected, no air pressure oscillation interference signal exists in the pulse wave signals of the mixed frequency, and the pulse wave signals of the mixed frequency are subjected to first-stage amplification through the first amplification circuit.
In a specific embodiment of the present invention, in the first amplifying circuit, R11=27K Ω is set, and R9=182K Ω is set, so that the first-stage amplification factor is: a. The 2 =182/27 ≈ 6.7 times; the pulse wave signals with the mixed frequencies are filtered by the first filter circuit to obtain low-frequency pulse wave signals, and the amplification factor of the final pulse wave signals is 44.5 multiplied by 6.7= 298.15.
And when the gas circuit is in the gas valve gassing state, atmospheric pressure fluctuation will introduce atmospheric pressure oscillation interference signal, like peak or noise interference, at this moment, predetermine the singlechip and according to preset gassing time, continuously make control pin output low level for triode Q1 is in the conducting state, management and control circuit passageway. Because R10=1K Ω, be far less than R11=27K Ω far away, at this moment first amplifier circuit is short-circuited, the pulse wave signal of mixed frequency will no longer pass through first amplifier circuit, but directly input first filter circuit and filter, and the pulse wave signal magnification that finally has the interference is only 44.5 times, compares in not having when managing and controlling the circuit, and the magnification is reduced 6.7 times, just so can effectively restrain the amplitude of atmospheric pressure oscillation interference signal.
Preferably, the blood pressure detection circuit further includes: a second amplifying circuit.
Fig. 4 is a second schematic structural diagram of the blood pressure detecting circuit provided by the embodiment of the present invention, as shown in fig. 4, the input end of the second amplifying circuit 9 is connected to the collector of the transistor Q1 in the management and control circuit 2 and the output end of the first amplifying circuit 3, and the output end of the second amplifying circuit 9 is connected to the input end of the first filter circuit 4.
In this embodiment, the second amplifying circuit 9 may include an operational amplifier U7, resistors R14 and R15, wherein one end of the resistor R14 is connected to the output end of the operational amplifier U6 in the first amplifying circuit 3, one end of the resistor R9, one end of the capacitor C5, and the collector of the transistor Q1 in the regulating and controlling circuit 2; one end of the resistor R16 of the first filter circuit 4 is connected to both the output end of the operational amplifier U7 of the second amplifier circuit 9 and one end of the resistor R15.
Based on the above embodiment, when the air pressure in the air path is stable, that is, the air valve is in a non-deflation state, at this time, the triode Q1 in the control circuit is cut off, the control circuit is open, no air pressure oscillation interference signal exists in the pulse wave signal of the mixed frequency, after the pulse wave signal of the mixed frequency is subjected to the first-stage amplification by the first amplification circuit, the pulse wave signal of the mixed frequency is subjected to the second-stage amplification by the second amplification circuit, R14=21K Ω and R15=182K Ω in the second amplification circuit are set, and then the second-stage amplification factor is a 3 And the amplification factor of the pulse wave signal is that (1) =182/21 ≈ 8.7 times), and finally the low-frequency pulse wave signal is obtained through a first filter circuit: 44.5 × 6.7 × 8.7=2593.9 times, so that the pulse wave signal at millivolt level is amplified by nearly 2600 times.
Similarly, in this embodiment, when the air valve is in the air release state, the air pressure fluctuation introduces an air pressure oscillation interference signal, at this time, the transistor Q1 in the control circuit is in the conducting state, the control circuit is turned on, at this time, the first amplifying circuit is short-circuited, the pulse wave signal with the mixed frequency will not pass through the first amplifying circuit any more, but directly enter the next stage circuit, and finally, the amplification factor of the pulse wave signal with interference is 44.5 × 8.7=387.15 times, which is reduced by 6.7 times compared with the case without the control circuit, thereby effectively suppressing the amplitude of the air pressure oscillation interference signal.
It can be understood, based on the utility model provides a blood pressure detection circuit according to actual design demand, carries out nimble processing to the lectotype and the design of circuit components and parts in the circuit, and resistance value in the regulating circuit can further deepen the inhibitory action to interference signal, reaches better inhibitory effect, does not specifically limit to this in this embodiment.
From the development point of view, technicians need to design an effective hardware circuit according to the characteristics of the generated interference and test the operational coefficients and the like used by the circuit, so as to obtain the optimal signal denoising effect.
The utility model discloses blood pressure detection circuit, under the bigger condition of the magnification of whole circuit, through inserting the management and control circuit, can make originally enlarged interfering signal effectively restrain, and the effect of restraining atmospheric pressure oscillation interfering signal can be more obvious.
The embodiment of the utility model provides an in, the triode in the management and control circuit can include PNP type triode or NPN type triode.
As shown in fig. 3 and 4, the control circuit uses a PNP type triode, and the PNP type triode is controlled to be in a cut-off state by presetting a control pin of the single chip to output a high level control signal; the PNP type triode is controlled to be in a conducting state by outputting a low-level control signal through a control pin of the preset singlechip, so that the on-off of the management and control circuit is controlled.
It can be understood that if an NPN-type triode is used, the NPN-type triode can be controlled to be turned on or off by presetting a control pin of the single chip microcomputer to output a high level or a low level, so as to implement on/off of the control circuit.
The utility model discloses blood pressure detection circuit, triode among the management and control circuit can use PNP type triode or NPN type triode, controls the break-make of management and control circuit through predetermineeing the singlechip, can realize the suppression effect to the atmospheric pressure oscillation interference signal who produces in the circuit.
The utility model discloses the researcher discovers, through the transformation design to the hardware circuit, realizes the signal processing to producing the period of atmospheric pressure oscillation, only through simply putting up of hardware circuit, alright make the useful blood pressure signal that has interference signal be the amplitude of pulse wave signal and obtain reducing, avoid the enlarged saturation of coupling atmospheric pressure signal, influence atmospheric pressure stability time, still can reduce peak interference or noise disturbance that atmospheric pressure oscillation arouses simultaneously.
In the prior art, by changing the gas path structure design of the electronic sphygmomanometer, the mold opening and injection molding are required in the early stage, so that not only is the research and development period and the cost consumed, but also the effect of inhibiting the air pressure oscillation interference is not ideal in practice, and the method of filtering the coupling interference in the environment by adopting means such as software algorithm, software filtering and the like not only can increase the software development cost, but also can increase the complexity of software design.
The blood pressure detection circuit provided by the embodiment of the utility model, through accessing the management and control circuit, the preset singlechip regulates the passage or the open circuit of the management and control circuit according to the stable state of the air pressure of the air circuit, and changes the amplification factor of the whole circuit; when the air circuit is in an air valve deflation state and the circuit generates an air pressure oscillation interference signal, the preset single chip microcomputer inputs a level signal to the control circuit, so that the control circuit is communicated, the amplification factor of the deflation time period signal is reduced, the air pressure oscillation interference signal introduced into the circuit is effectively filtered, the noise removing capability of the blood pressure detection circuit is improved, the effect is obvious, the operation is simple, and the time and the cost are saved.
Optionally, fig. 5 is the third structural schematic diagram of the blood pressure detecting circuit provided by the embodiment of the present invention, as shown in fig. 5, the other end of the first resistor in the management and control circuit 2 is connected to the output of the first amplifying circuit and the input of the second amplifying circuit at the same time, and the collector of the triode Q1 in the management and control circuit 2 is connected to the output of the second amplifying circuit 9 and the input of the first filter circuit at the same time.
In the present embodiment, the management and control circuit 2 of the single chip microcomputer is disposed on the second amplifying circuit 9, and under the condition that the amplitude range is not exceeded, the processing of the barometric oscillation interference signal can also be realized.
On the basis of any of the above embodiments, when the air pressure in the air path is stable, that is, the air valve is in a non-deflation state, at this time, the triode Q1 in the control circuit is cut off, no air pressure oscillation interference signal exists in the pulse wave signal, after the first stage amplification is performed on the pulse wave signal by the first amplification circuit, the second stage amplification is performed on the pulse wave signal by the second amplification circuit, and finally the pulse wave signal is filtered by the first filtering circuit to obtain a low-frequency pulse wave signal, wherein the amplification factor of the pulse wave signal is still 44.5 × 6.7 × 8.7=2593.9 times.
When the gas circuit is in a gas valve deflation state, peak or noise interference is introduced by gas pressure fluctuation, the triode Q1 in the control circuit is in a conducting state, the second amplifying circuit is short-circuited, the pulse wave signal does not pass through the second amplifying circuit any more, but is directly input into the first filter circuit for filtering, finally, the amplification factor of the pulse wave signal with interference is 44.5 multiplied by 6.7=298.15 times, the amplitude of the gas pressure oscillation interference signal can be effectively inhibited, and the interference introduced by gas pressure oscillation is reduced.
The utility model discloses blood pressure detection circuit through with the management and control circuit setting on second amplifier circuit, also can realize the effective suppression to atmospheric pressure oscillation interference signal equally for the circuit can design in a flexible way and overall arrangement, improves the practicality.
In order to ensure that the amplitude of the pulse wave signal that signal processing circuit acquireed does not exceed the maximum threshold value of operational amplifier output, the embodiment of the utility model provides an in, still need set for the magnification of not overrange to amplifier circuit according to atmospheric pressure oscillation interference signal's amplitude to and set for different operational amplifier's reference voltage according to the amplitude scope, from this the utility model discloses an in the embodiment, blood pressure detection circuit can also include reference voltage bleeder circuit.
Fig. 6 is a schematic structural diagram of a reference voltage divider circuit in a blood pressure detection circuit provided in an embodiment of the present invention, as shown in fig. 6, preferably, in an embodiment of the present invention, the blood pressure detection circuit further includes: a reference voltage divider circuit; the reference voltage division circuit comprises a first reference voltage output terminal 61, a second reference voltage output terminal 62, a third reference voltage output terminal 63 and a fourth reference voltage output terminal 64;
in this embodiment, the first reference voltage output terminal outputs a first reference voltage for providing a standard voltage to the third amplifying circuit; the second reference voltage output end outputs a second reference voltage which is used for providing reference voltage for the follower circuit; the third reference voltage output end outputs a third reference voltage which is used for providing reference voltage for the first amplifying circuit and the second amplifying circuit; and the fourth reference voltage output end outputs a fourth reference voltage which is used for providing reference voltage for the piezoelectric signal acquisition circuit.
Therefore, the first reference voltage output end is connected with the third amplifying circuit, the second reference voltage output end is connected with the following circuit, the third reference voltage output end is connected with the first amplifying circuit, the third reference voltage output end is connected with the second amplifying circuit, and the fourth reference voltage output end is connected with the piezoelectric signal acquisition circuit.
The utility model discloses blood pressure detection circuit, through benchmark bleeder circuit's design, ensures that the amplitude of the pulse wave signal that signal processing circuit acquireed does not exceed the maximum threshold value of operational amplifier output to guarantee the accuracy and the reliability of the signal data who handles.
In an embodiment of the present invention, the reference voltage divider circuit further includes a reference voltage source, a fourth resistor R18, a fifth resistor R19, a sixth resistor R20, a seventh resistor R21, an eighth resistor R22, and a ninth resistor R23;
the reference voltage source is connected to one end of the fourth resistor R18 and one end of the eighth resistor R22, the other end of the fourth resistor R18 is connected to one end of the second reference voltage output end 62 and one end of the fifth resistor R19, the other end of the eighth resistor R22 is connected to one end of the first reference voltage output end 61 and one end of the ninth resistor R23, the other end of the ninth resistor R23 is grounded, the other end of the fifth resistor R19 is connected to one end of the third reference voltage output end 63 and one end of the sixth resistor R20, the other end of the sixth resistor R20 is connected to one end of the fourth reference voltage output end 64 and one end of the seventh resistor R21, and the other end of the seventh resistor R21 is grounded.
In this embodiment, the reference voltages of the different amplification circuits are output by the reference voltage dividing circuit.
Based on the above embodiment, in the utility model discloses a specific embodiment, reference voltage source produces reference voltage and is 2.5V, and according to actual circuit's design demand, first reference voltage is 1.14V, and second reference voltage is 1.65V, and third reference voltage is 1.25V, and fourth reference voltage is 0.48V.
Thus, R18=10K Ω, R19=4.7K Ω, R20=9.1K Ω, R21=5.6K Ω; r22=34K Ω, R23=12.4K Ω, R24=10K Ω;
then, it is possible to obtain
The utility model discloses blood pressure detection circuit through many resistance partial pressure designs, ensures each operational amplifier that corresponds among each reference voltage adapter circuit of reference voltage bleeder circuit output, makes the signal of operational amplifier output in the range of allowwing to guarantee the accuracy and the reliability of the signal data who generates.
Fig. 7 is a fourth schematic structural diagram of the blood pressure detecting circuit provided by the embodiment of the present invention, as shown in fig. 7, in the embodiment of the present invention, the blood pressure detecting circuit further includes: a cuff pressure signal detection circuit 10; wherein, the output end of the third amplifying circuit 7 is connected with the input end of the cuff pressure signal detecting circuit 10.
As shown in fig. 7, the cuff pressure signal detecting circuit described in the embodiment of the present invention may include a low-pass filter circuit, which includes a filter EA1, a capacitor C5, and resistors R7, R8, and R9.
Based on any one of the above embodiments, in this embodiment, the piezoelectric signal output by the piezoelectric signal acquisition circuit is subjected to signal amplification by the third amplification circuit, the amplified piezoelectric signal enters the cuff pressure signal detection circuit, and the cuff pressure signal can be obtained by low-pass filtering.
The utility model discloses blood pressure detection circuit acquires the sleeve area pressure signal through sleeve area pressure signal detection circuit, and it provides data support to calculate for follow-up blood pressure detection that carries on.
Fig. 8 is the whole structure schematic diagram of the blood pressure detection circuit that the embodiment of the utility model provides, as shown in fig. 8, pressure sensor converts the gasbag pressure signal who gathers into the analog signal of telecommunication, acquires piezoelectric signal promptly, inputs piezoelectric signal to the third amplifier circuit and tentatively amplifies, and the signal flow of piezoelectric signal after the enlarging divide into two branch roads.
In the first branch, the amplified piezoelectric signal enters a cuff pressure signal detection circuit to obtain a cuff pressure signal after filtering;
in the second branch, the amplified piezoelectric signal enters a following circuit so as to effectively inhibit the interference of a post-stage amplification circuit on a preceding stage weak piezoelectric signal, and then the piezoelectric signal enters a second filter circuit from the following circuit so as to filter a cuff pressure signal and obtain a pulse wave signal with mixed frequency;
when the pulse wave signals have the pneumatic oscillation interference signals, the control circuit is connected to enable the first amplifying circuit to be short-circuited, so that the pneumatic oscillation interference signals in the pulse wave signals are effectively inhibited, and the low-frequency pulse wave signals are obtained through the second amplifying circuit and the first filtering circuit;
when the pulse wave signals do not have the air pressure oscillation interference signals, the control circuit is switched off, the pulse wave signals pass through the first amplifying circuit, the second amplifying circuit and the first filtering circuit to be subjected to multistage amplification and filtering, and finally the low-frequency pulse wave signals are obtained.
In this embodiment, after the cuff pressure signal and the low-frequency pulse wave signal are obtained, the cuff pressure signal and the low-frequency pulse wave signal are sent to an a/D sampling channel of a preset single chip for sampling and analog-to-digital conversion, so as to obtain digital signals corresponding to the cuff pressure signal and the pulse wave signal, and a blood pressure algorithm is calculated based on the digital signals, so as to obtain a blood pressure detection result.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment may be implemented by software plus a necessary general hardware platform, and may also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods of the various embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (8)
1. A blood pressure detection circuit, comprising:
the device comprises a preceding stage signal processing circuit, a control circuit, a first amplifying circuit and a first filter circuit;
the control circuit comprises a triode, a first resistor, a second resistor and a third resistor;
wherein, the one end of first resistance with the projecting pole of triode is connected, the other end of first resistance simultaneously with second filter circuit among the preceding stage signal processing circuit, first amplifier circuit's input is connected, the one end of second resistance simultaneously with the one end of third resistance the base of triode is connected, the other end ground connection of second resistance, the other end of third resistance is connected with the control pin of predetermineeing the singlechip, the collecting electrode of triode simultaneously with first filter circuit's input, first amplifier circuit's output is connected.
2. The blood pressure detection circuit according to claim 1, further comprising:
a second amplifying circuit;
the input end of the second amplifying circuit is connected with the collector electrode of the triode in the control circuit and the output end of the first amplifying circuit, and the output end of the second amplifying circuit is connected with the input end of the first filtering circuit.
3. The blood pressure detecting circuit according to claim 2, wherein the other end of the first resistor in the control circuit is connected to the output terminal of the first amplifying circuit and the input terminal of the second amplifying circuit, and the collector of the transistor in the control circuit is connected to the output terminal of the second amplifying circuit and the input terminal of the first filter circuit.
4. The blood pressure detection circuit according to claim 2, wherein the preceding stage signal processing circuit includes a piezoelectric signal acquisition circuit, a third amplification circuit, a follower circuit, and the second filter circuit;
the output end of the piezoelectric signal acquisition circuit is connected with the input end of the third amplification circuit, the output end of the third amplification circuit is connected with the input end of the following circuit, the output end of the following circuit is connected with the input end of the second filter circuit, and the output end of the second filter circuit is simultaneously connected with the input end of the first amplification circuit and the other end of the first resistor in the control circuit.
5. The blood pressure detection circuit of claim 4, further comprising:
a cuff pressure signal detection circuit;
the output end of the third amplifying circuit is connected with the input end of the cuff pressure signal detecting circuit.
6. The blood pressure detection circuit of claim 4, further comprising:
a reference voltage divider circuit;
the reference voltage divider circuit comprises a first reference voltage output end, a second reference voltage output end, a third reference voltage output end and a fourth reference voltage output end;
the first reference voltage output end is connected with the third amplifying circuit, the second reference voltage output end is connected with the following circuit, the third reference voltage output end is connected with the first amplifying circuit, the third reference voltage output end is connected with the second amplifying circuit, and the fourth reference voltage output end is connected with the piezoelectric signal collecting circuit.
7. The blood pressure detection circuit of claim 6 wherein the reference voltage divider circuit further comprises a reference voltage source, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, and a ninth resistor;
the reference voltage source is connected with one end of the fourth resistor and one end of the eighth resistor, the other end of the fourth resistor is connected with one end of the second reference voltage output end and one end of the fifth resistor, the other end of the eighth resistor is connected with one end of the first reference voltage output end and one end of the ninth resistor, the other end of the ninth resistor is grounded, the other end of the fifth resistor is connected with one end of the third reference voltage output end and one end of the sixth resistor, the other end of the sixth resistor is connected with one end of the fourth reference voltage output end and one end of the seventh resistor, and the other end of the seventh resistor is grounded.
8. The blood pressure detection circuit according to any of claims 1-7, wherein the transistor comprises a PNP transistor or an NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220078334.0U CN217793031U (en) | 2022-01-12 | 2022-01-12 | Blood pressure detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220078334.0U CN217793031U (en) | 2022-01-12 | 2022-01-12 | Blood pressure detection circuit |
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| Publication Number | Publication Date |
|---|---|
| CN217793031U true CN217793031U (en) | 2022-11-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220078334.0U Active CN217793031U (en) | 2022-01-12 | 2022-01-12 | Blood pressure detection circuit |
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| CN (1) | CN217793031U (en) |
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- 2022-01-12 CN CN202220078334.0U patent/CN217793031U/en active Active
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