Blood pressure meter, blood pressure detection circuit operation state detection method

Abstract

This disclosure relates to a blood pressure monitor and a method for detecting the working status of a blood pressure detection circuit. The blood pressure monitor includes: a signal generation circuit for generating an excitation signal; a blood pressure detection circuit including a piezoelectric Korotkoff sound sensor electrically connected to the signal generation circuit and outputting a response signal based on the excitation signal; a differential circuit electrically connected to the piezoelectric Korotkoff sound sensor for acquiring the response signal and performing differential processing on the acquired response signal and a reference signal to obtain a differential result; and a processing circuit electrically connected to the differential circuit for determining the working status of the blood pressure detection circuit based on the differential result. This disclosure verifies the working status of the blood pressure detection circuit by acquiring the response signal generated by the excitation, thereby enabling the blood pressure monitor to perform a self-test of the blood pressure detection circuit before blood pressure measurement, thus determining in advance whether the blood pressure monitor can detect blood pressure normally.

Description

Technical Field

[0001] This disclosure relates to the field of equipment self-testing technology, specifically to a method for detecting the working status of a blood pressure monitor and a blood pressure detection circuit. Background Technology

[0002] In related technologies, Korotkoff sound sphygmomanometers are electronic blood pressure monitors that measure blood pressure through auscultation. The accuracy of Korotkoff sound signal acquisition is crucial to the accuracy of auscultatory measurements. Whether the blood pressure detection circuit, including the Korotkoff sound sensor, is functioning properly directly determines the accuracy of the Korotkoff sound sphygmomanometer's measurement results.

[0003] In Korotkoff sound sphygmomanometers, malfunctions such as broken piezoelectric ceramic materials, detached solder leads, and abnormal cuff interfaces can lead to abnormal Korotkoff sound signal acquisition, resulting in inaccurate blood pressure measurements. Therefore, it is necessary to check the status of the blood pressure detection circuit to confirm that the sphygmomanometer is in normal working order, thereby ensuring the accuracy of blood pressure measurements. Summary of the Invention

[0004] To address the aforementioned problems in the prior art, this disclosure provides a blood pressure monitor, a method for detecting the working status of a blood pressure detection circuit, an electronic device, and a storage medium.

[0005] A first aspect of this disclosure provides a blood pressure monitor, comprising: a signal generation circuit for generating an excitation signal; a blood pressure detection circuit including a piezoelectric Korotkoff sound sensor electrically connected to the signal generation circuit and outputting a response signal based on the excitation signal; a differential circuit electrically connected to the piezoelectric Korotkoff sound sensor for acquiring the response signal and performing differential processing on the acquired response signal and a reference signal to obtain a differential result; and a processing circuit electrically connected to the differential circuit for determining the operating state of the blood pressure detection circuit based on the differential result.

[0006] In some embodiments, the differential circuit includes a first port and a second port, the first port being connected to the signal generation circuit, the second port being connected to the piezoelectric Korotkoff sound sensor, and the differential result being obtained by differentially processing the signal received by the first port and the signal received by the second port.

[0007] In some embodiments, the blood pressure monitor further includes a capacitive coupling circuit electrically connected to the signal generation circuit, the capacitive coupling circuit being used to couple the excitation signal to the piezoelectric Korotkoff sound sensor and the first port.

[0008] In some embodiments, the blood pressure detection circuit further includes a microcontroller, which includes a signal generation module and a processing module; wherein the microcontroller is electrically connected to the piezoelectric Korotkoff sound sensor and is used to determine blood pressure based on the Korotkoff sound signal collected by the piezoelectric Korotkoff sound sensor; the signal generation circuit is the signal generation module; and the processing circuit is the processing module.

[0009] In some embodiments, the blood pressure detection circuit further includes an analog-to-digital converter circuit; wherein, the analog-to-digital converter circuit is disposed between the microcontroller and the piezoelectric Korotkoff sound sensor, and the analog-to-digital converter circuit is used to acquire the Korotkoff sound signal and convert the Korotkoff sound signal into a digital signal; the analog-to-digital converter circuit is the differential circuit.

[0010] In some embodiments, the piezoelectric Korotkoff sound sensor includes a first electrode and a second electrode, the first electrode being electrically connected to the signal generation circuit, and the second electrode being connected to the second port to transmit the response signal to the differential circuit.

[0011] The second aspect of this disclosure provides a method for detecting the operating state of a blood pressure detection circuit, applied to a blood pressure monitor according to any one of the first aspects. The method includes: controlling the signal generation circuit to send an excitation signal to the piezoelectric Korotkoff sound sensor, so that the piezoelectric Korotkoff sound sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; acquiring a differential result obtained by the differential circuit through differential processing based on the acquired response signal and a reference signal; and determining the operating state of the blood pressure detection circuit based on the differential result.

[0012] In some embodiments, the reference signal is the excitation signal or a preset reference signal.

[0013] In some embodiments, the differential result is determined as follows: the voltage amplitude of the response signal acquired by the differential circuit and the voltage amplitude of the reference signal are differentially processed to obtain the voltage difference, and the voltage difference is used as the differential result.

[0014] In some embodiments, determining the operating state of the blood pressure detection circuit based on the differential result includes: comparing the differential result with a first voltage threshold and a second voltage threshold respectively; determining that the blood pressure detection circuit is in a short-circuit state when the differential result is less than the first voltage threshold; determining that the blood pressure detection circuit is in a normal state when the differential result is greater than or equal to the first voltage threshold and less than or equal to the second voltage threshold; and determining that the blood pressure detection circuit is in an open-circuit state when the differential result is greater than the second voltage threshold, wherein the first voltage threshold is less than the second voltage threshold, and the second voltage threshold is less than the voltage amplitude of the reference signal.

[0015] In some embodiments, the differential result is determined as follows: the current phase of the response signal acquired by the differential circuit is differentially processed with the current phase of the reference signal to obtain a phase difference, and the phase difference is used as the differential result.

[0016] In some embodiments, when the differential circuit fails to receive a response signal, the differential result is invalid. Determining the operating state of the blood pressure detection circuit based on the differential result includes: comparing the differential result with a first phase threshold; determining that the blood pressure detection circuit is in an open-circuit state when the differential result is invalid; determining that the blood pressure detection circuit is in a short-circuit state when the differential result is less than or equal to the first phase threshold; and determining that the blood pressure detection circuit is in a normal state when the differential result is greater than the first phase threshold.

[0017] In some embodiments, the signal generation circuit includes an output port electrically connected to the differential circuit and the piezoelectric Korotkoff sound sensor, and the method further includes: when the detection method is not performed, the output port is configured to a high impedance state.

[0018] A third aspect of this disclosure provides a device for detecting the operating state of a blood pressure detection circuit, used to execute the method for detecting the operating state of a blood pressure detection circuit according to any one of the second aspects. The device includes: a detection unit, used to control the signal generation circuit to send an excitation signal to the piezoelectric Korotkoff sound sensor, so that the piezoelectric Korotkoff sound sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; and a processing unit, used to acquire the differential result obtained by the differential circuit based on the differential processing of the acquired response signal and the reference signal, and determine the operating state of the blood pressure detection circuit according to the differential result.

[0019] In some embodiments, the reference signal is the excitation signal or a preset reference signal.

[0020] In some embodiments, the processing unit is configured to determine the differential result in the following manner: perform differential processing on the voltage amplitude of the response signal acquired by the differential circuit and the voltage amplitude of the reference signal to obtain a voltage difference, and use the voltage difference as the differential result.

[0021] In some embodiments, the processing unit is configured to determine the operating state of the blood pressure detection circuit based on the differential result in the following manner: comparing the differential result with a first voltage threshold and a second voltage threshold respectively; determining that the blood pressure detection circuit is in a short-circuit state when the differential result is less than the first voltage threshold; determining that the blood pressure detection circuit is in a normal state when the differential result is greater than or equal to the first voltage threshold and less than or equal to the second voltage threshold; and determining that the blood pressure detection circuit is in an open-circuit state when the differential result is greater than the second voltage threshold, wherein the first voltage threshold is less than the second voltage threshold, and the second voltage threshold is less than the voltage amplitude of the reference signal.

[0022] In some embodiments, the processing unit is configured to determine the differential result in the following manner: perform differential processing on the current phase of the response signal acquired by the differential circuit and the current phase of the reference signal to obtain a phase difference, and use the phase difference as the differential result.

[0023] In some embodiments, when the differential circuit fails to receive a response signal, the differential result is invalid. The processing unit is configured to determine the operating state of the blood pressure detection circuit based on the differential result in the following manner: comparing the differential result with a first phase threshold; determining that the blood pressure detection circuit is in an open-circuit state when the differential result is invalid; determining that the blood pressure detection circuit is in a short-circuit state when the differential result is less than or equal to the first phase threshold; and determining that the blood pressure detection circuit is in a normal state when the differential result is greater than the first phase threshold.

[0024] A fourth aspect of this disclosure provides an electronic device, comprising: a memory for storing instructions; and a processor for calling the instructions stored in the memory to execute the operating state detection method of the blood pressure detection circuit according to any one of the second aspects.

[0025] The fifth aspect of this disclosure provides a computer-readable storage medium storing instructions that, when executed by a processor, perform a method for detecting the operating state of a blood pressure detection circuit as described in any of the second aspects.

[0026] The technical solution provided in this disclosure may include the following beneficial effects: This disclosure excites the piezoelectric Korotkoff sound sensor through a signal generation circuit and outputs a corresponding response signal, and verifies the working status of the blood pressure detection circuit through signal feedback. This allows the blood pressure monitor to perform a self-test on the blood pressure detection circuit before blood pressure measurement, thereby determining in advance whether the blood pressure monitor can detect blood pressure normally, and judging different working states based on different differential results, so as to implement corresponding fault handling strategies for the blood pressure monitor. Attached Figure Description

[0027] The above and other objects, features, and advantages of embodiments of this disclosure will become readily apparent upon reading the following detailed description with reference to the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which: Figure 1 This is a circuit diagram of a blood pressure monitor according to an exemplary embodiment.

[0028] Figure 2 This is a circuit diagram of a blood pressure monitor according to an exemplary embodiment.

[0029] Figure 3 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0030] Figure 4 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0031] Figure 5 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0032] Figure 6 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0033] Figure 7 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0034] Figure 8 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0035] Figure 9 This is a block diagram illustrating the operating status detection device of a blood pressure detection circuit according to an exemplary embodiment.

[0036] Figure 10 This is a block diagram illustrating an electronic device according to an exemplary embodiment.

[0037] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0038] Explanation of reference numerals in the attached figures: 10. Signal generation circuit; 11. Output port; 20. Piezoelectric Korotkoff sound sensor; 21. First electrode; 22. Second electrode; 30. Differential circuit; 31. First port; 32. Second port; 40. Processing circuit; 50. Capacitive coupling circuit; 60. Microcontroller; 71. Detection unit; 72. Processing unit; 100. Blood pressure detection circuit; 300. Electronic equipment; 301. Memory; 302. Processor; 303. I / O interface. Detailed Implementation

[0039] The principles and spirit of this disclosure will now be described with reference to several exemplary embodiments. It should be understood that these embodiments are given merely to enable those skilled in the art to better understand and implement this disclosure, and are not intended to limit the scope of this disclosure in any way.

[0040] It should be noted that although the terms "first," "second," etc., are used herein to describe different modules, steps, and data in the embodiments of this disclosure, these terms are only for distinguishing between different modules, steps, and data, and do not indicate a specific order or degree of importance. In fact, the terms "first," "second," etc., can be used interchangeably.

[0041] The Korotkoff-sound method, also known as the auscultatory method, is a non-invasive blood pressure measurement method. The principle of the Korotkoff-sound method is to use an inflatable cuff to compress an artery, blocking blood flow, and then slowly deflate the cuff. During the deflation process, the blood impacts the blood vessel wall, creating intermittent arterial pulsation sounds, known as Korotkoff sounds. Blood pressure monitors determine systolic and diastolic blood pressure by identifying the Korotkoff sounds and the corresponding pressure points during the obstruction of arterial blood flow. For example, the pressure in the cuff corresponding to the first Korotkoff sound represents systolic blood pressure, and the pressure in the cuff corresponding to the disappearance or change in tone of the Korotkoff sound represents diastolic blood pressure.

[0042] In related technologies, the self-testing method for blood pressure monitors usually involves playing back the Korotkoff sound signals collected by the blood pressure monitor to check whether the Korotkoff sound signals collected by the blood pressure monitor deviate significantly from the normal range, thereby determining whether there is a malfunction in the blood pressure detection circuit of the blood pressure monitor.

[0043] However, the above method relies on Korotkoff sound signals collected after blood pressure measurement, and cannot be performed before blood pressure measurement, nor can it determine the type of internal fault.

[0044] In view of the above, this disclosure provides a blood pressure monitor and a method for detecting the working status of a blood pressure detection circuit. The method for detecting the working status of a blood pressure detection circuit provided in this disclosure can be applied to the blood pressure monitoring circuit in a blood pressure monitor. The blood pressure monitor can be any device that has the function of measuring blood pressure by detecting Korotkoff sounds.

[0045] Figure 1 This is a circuit diagram of a blood pressure monitor according to an exemplary embodiment.

[0046] In some embodiments, such as Figure 1 As shown, the blood pressure monitor may include: a signal generation circuit 10, a blood pressure detection circuit 100, a differential circuit 30, and a processing circuit 40. The signal generation circuit 10 can be used to generate an excitation signal. The blood pressure detection circuit 100 can be used to acquire Korotkoff sounds and obtain blood pressure detection results based on the acquired Korotkoff sounds. The blood pressure detection circuit 100 may include a piezoelectric Korotkoff sound sensor 20 for acquiring Korotkoff sound signals. The piezoelectric Korotkoff sound sensor 20 can be electrically connected to the signal generation circuit 10, and after receiving the excitation signal, the piezoelectric Korotkoff sound sensor 20 can output a corresponding response signal based on the excitation signal. The differential circuit 30 can be electrically connected to the piezoelectric Korotkoff sound sensor 20. The differential circuit 30 can be used to acquire the response signal and perform differential processing between the acquired response signal and a reference signal to obtain a differential result. When the blood pressure detection circuit 100 operates in different states, the differential circuit 30 can acquire different signals and output different differential results. The processing circuit 40 can be electrically connected to the differential circuit 30. The processing circuit 40 can receive the differential result from the differential circuit 30 and determine the working state of the blood pressure detection circuit 100 based on the differential result. This disclosure excites the piezoelectric Korotkoff sound sensor 20 through the signal generation circuit 10 and outputs a corresponding response signal. The working state of the blood pressure detection circuit 100 is verified through signal feedback. This allows the blood pressure monitor to perform a self-test on the blood pressure detection circuit 100 before blood pressure measurement, thereby determining in advance whether the blood pressure monitor can detect blood pressure normally. Based on different differential results, different working states can be determined to facilitate corresponding fault handling of the blood pressure monitor.

[0047] In some embodiments, such as Figure 1As shown, the differential circuit 30 may include a first port 31 and a second port 32. The first port 31 can be connected to the signal generation circuit 10, and the differential circuit 30 can receive the signal from the signal generation circuit 10 through the first port 31. The second port 32 can be connected to the piezoelectric Korotkoff sound sensor 20, and the differential circuit 30 can receive the response signal output from the piezoelectric Korotkoff sound sensor 20 through the second port 32. The differential circuit 30 can perform differential processing on the signal received by the first port 31 and the signal received by the second port 32 to obtain a differential result. Since the response signal is the signal generated by the piezoelectric Korotkoff sound sensor 20 under the excitation of the excitation signal, when the state of the blood pressure detection circuit 100 is constant, the characteristic values ​​of the excitation signal and the characteristic values ​​of the response signal can show a corresponding relationship. Therefore, differential processing can be used to confirm whether the signal received by the differential circuit 30 conforms to the above correspondence. When the differential result conforms to the above correspondence, it indicates that the differential circuit 30 has normally received the excitation signal and response signal, indicating that the blood pressure detection circuit 100 is in normal condition. When the differential result does not conform to the above correspondence, it indicates that the differential circuit 30 has failed to receive the corresponding response signal, or that the electrical parameters of the blood pressure detection circuit 100 itself have changed. This indicates that the blood pressure detection circuit 100 is in an abnormal state, so that the blood pressure monitor needs to be troubleshooted. Since external environmental interference can interfere with the excitation signal, while the generated response signal can still maintain a specific correspondence with the interfered excitation signal, having the differential circuit 30 receive and perform differential processing on the excitation signal and response signal can reduce the detection deviation caused by external environmental interference, thereby improving the detection accuracy and stability of the blood pressure detection circuit 100.

[0048] In other embodiments, the first port 31 can also be electrically connected to a fixed-level or other signal source circuit, and the signal provided by the connected signal source is differentially processed with the signal received by the second port 32 to obtain a differential result. The fixed-level or other signal source circuit can be a preset signal parameter according to the differential requirements. The differential circuit 30 can perform differential processing on the response signal and the preset signal parameter to obtain a differential result. By confirming whether the differential result is within a preset range, it can be determined whether the blood pressure monitor is in a faulty state.

[0049] Figure 2 This is a circuit diagram of a blood pressure monitor according to an exemplary embodiment.

[0050] In some embodiments, such as Figure 1 and Figure 2As shown, the blood pressure monitor may further include a capacitive coupling circuit 50. The capacitive coupling circuit 50 is electrically connected to the signal generation circuit 10 and is used to couple the excitation signal to the piezoelectric Korotkoff sound sensor 20 and the first port 31. When the blood pressure detection circuit 100 is not performing a detection, to prevent the Korotkoff sound signal from flowing into the signal generation circuit 10 and causing signal shunting, the signal generation circuit 10 can maintain a high impedance state. When the signal generation circuit 10 increases its own impedance, it will generate a DC interference signal. The capacitive coupling circuit 50 has the characteristic of blocking DC and conducting AC, which can block the DC interference signal to prevent the signal generation circuit 10 from interfering with the blood pressure detection circuit 100 when it increases its impedance. The excitation signal can be an AC signal to facilitate smooth passage through the capacitive coupling circuit 50.

[0051] In some embodiments, such as Figure 2 As shown, the blood pressure detection circuit 100 may further include a microcontroller 60. The microcontroller can be a microcomputer system integrating a central processing unit, memory, and input / output interfaces. The microcontroller 60 may include a signal generation module and a processing module. The microcontroller 60 can be electrically connected to the piezoelectric Korotkoff sound sensor 20 and receive the Korotkoff sound signals collected by the sensor. Based on the Korotkoff sound signals, the corresponding blood pressure data is obtained. The signal generation circuit 10 can be a signal generation module, where the excitation signal can be simulated through the output of the microcontroller 60. The processing circuit 40 can be a processing module, enabling the microcontroller 60 to process the Korotkoff sound signals and output blood pressure data during blood pressure detection. During the self-test of the blood pressure monitor, it can be used to process differential results and determine the circuit status accordingly. By reusing the structural components of the blood pressure detection circuit 100, the number of components required for the blood pressure monitor's self-test can be reduced, reducing the introduction of additional components, lowering component costs, and reducing the space occupied during installation.

[0052] In some embodiments, the frequency of the excitation signal is a preset known frequency. The microcontroller 60 can use its built-in bandpass filter module to specifically filter the differential result transmitted by the differential circuit 30, removing interference signals and DC signal components from the signal based on the known excitation signal frequency, thereby obtaining a clearer differential result. For example, the frequency of the excitation signal can be preset to 100 Hz, and the bandpass filter module can filter out interference signals other than 100 Hz.

[0053] In other embodiments, the bandpass filter module may also be an independent bandpass filter circuit, electrically connected to the processing circuit 40, for targeted filtering of the differential results transmitted by the differential circuit 30, and transmitting the filtered differential results to the processing circuit 40.

[0054] In some embodiments, such as Figure 2As shown, the blood pressure detection circuit 100 may further include an analog-to-digital converter (ADC) circuit. This ADC circuit can be positioned between the microcontroller 60 and the piezoelectric Korotkoff sound sensor 20. The ADC circuit can acquire Korotkoff sound signals and convert them into digital signals for processing by the microcontroller 60. The ADC circuit may include at least two ports to receive the AC signal generated by the piezoelectric Korotkoff sound sensor 20 based on the Korotkoff sound, and perform differential processing on the AC signal to obtain a voltage value. The microcontroller 60 can determine the characteristic value of the Korotkoff sound signal based on the sign and magnitude of the voltage value. The ADC circuit is a differential circuit 30. By reusing the structural components of the blood pressure detection circuit 100, the number of components required for the blood pressure monitor's self-test can be reduced, minimizing the introduction of additional components, lowering component costs, and reducing the space occupied during installation.

[0055] In some embodiments, such as Figure 1 and Figure 2 As shown, the piezoelectric Korotkoff sound sensor 20 may include a first electrode 21 and a second electrode 22. The first electrode 21 may be electrically connected to the signal generation circuit 10 so that the first electrode 21 can receive the excitation signal from the signal generation circuit 10. The second electrode 22 may be connected to the second port 32 to transmit the response signal to the differential circuit 30. The first electrode 21 and the second electrode 22 may be electrode structures disposed on opposite sides of the piezoelectric element of the piezoelectric Korotkoff sound sensor 20. The first electrode 21 and the second electrode 22 may be equivalent to capacitor elements. When the first electrode 21 receives an excitation signal in the form of an AC signal, the signal energy can be coupled to the second electrode 22 and a corresponding response signal can be generated, so that the response signal can be triggered and transmitted from the second electrode 22 to the differential circuit 30. A piezoelectric material is present between the first electrode 21 and the second electrode 22. The first electrode 21 and the second electrode 22 can be considered equivalent to a capacitor with the piezoelectric material as the capacitor medium. When the structure of the piezoelectric Korotkoff sound sensor 20 remains unchanged, the parameters of the equivalent capacitance are constant. Therefore, the piezoelectric Korotkoff sound sensor 20 can respond to the same excitation signal with a response signal having the same characteristic parameters. When a fault occurs, such as the piezoelectric material of the piezoelectric Korotkoff sound sensor 20 breaking, electrode detachment, or changes in the electrode structure, the equivalent capacitance formed by the first electrode 21 and the second electrode 22 will change due to changes in capacitance parameters such as dielectric parameters and electrode distance, resulting in changes in the characteristic parameters of the response signal. The differential circuit 30 can be used to determine whether the characteristic parameters of the response signal have changed relative to the characteristic parameters of the excitation signal, and the extent of the change. Therefore, the operating state of the blood pressure detection circuit 100 can be determined based on the differential results.

[0056] Figure 3 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0057] Based on the same concept, this disclosure also provides a method for detecting the operating status of a blood pressure detection circuit, applied to a blood pressure monitor, such as... Figure 3 As shown, the method for detecting the working status of a blood pressure detection circuit may include the following steps: S10: The control signal generation circuit sends an excitation signal to the piezoelectric Korotkow tone sensor, so that the piezoelectric Korotkow tone sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; S20: Obtain the differential result obtained by the differential circuit through differential processing of the acquired response signal and the reference signal; S30: Determine the operating status of the blood pressure detection circuit based on the differential results.

[0058] In this embodiment, the control signal generation circuit 10 first sends an excitation signal to the piezoelectric Korotkoff sound sensor 20. The excitation signal can be an alternating current signal. The opposing first electrode 21 and second electrode 22 of the piezoelectric Korotkoff sound sensor 20 can be equivalent to capacitor elements. The piezoelectric Korotkoff sound sensor 20 can generate a response signal under the excitation signal through the equivalent capacitor structure, and feed the response signal back to the differential circuit 30. When the operating state of the blood pressure detection circuit 100 is different, the signal received by the differential circuit 30 is also different. The received response signal can be determined through differential processing. The differential circuit 30 can obtain whether the characteristic parameters of the response signal have changed relative to the characteristic parameters of the excitation signal and the extent of the change. Thus, the operating state of the blood pressure detection circuit 100 can be determined based on the differential result. The execution of the above detection method does not depend on the Korotkoff sound signal, so the above detection method can be executed at any time when the blood pressure monitor is not performing blood pressure measurement. By enabling the blood pressure monitor to check its own blood pressure detection circuit 100 before blood pressure measurement, it is possible to determine in advance whether the blood pressure detection circuit 100 is normal, and thus determine whether the blood pressure monitor can detect blood pressure normally. Furthermore, based on the different differential results, it can be determined that the blood pressure detection circuit 100 is in different working states, so as to implement the corresponding fault handling strategy for the blood pressure monitor according to the fault type.

[0059] In some embodiments, the reference signal can be a preset reference signal. Since the differential circuit 30 can receive different signals when the blood pressure detection circuit 100 is in different working states, the received signal and the preset reference signal are differentially processed to obtain the difference between the signal parameters received by the differential circuit 30 and the preset signal parameters. Based on the difference, the working state of the blood pressure detection circuit 100 can be determined.

[0060] In some embodiments, the reference signal can be an excitation signal. Since the response signal is generated by the piezoelectric Korotkoff sound sensor 20 under the excitation signal, the characteristic values ​​of the excitation signal and the characteristic values ​​of the response signal can correspond when the state of the blood pressure detection circuit 100 is constant. Differential processing is used to confirm whether the signal received by the differential circuit 30 conforms to the above correspondence. When the differential result conforms to the above correspondence, it indicates that the differential circuit 30 has normally received the excitation signal and the response signal, indicating that the blood pressure detection circuit 100 is in a normal state. When the differential result does not conform to the above correspondence, it indicates that the differential circuit 30 has failed to receive the corresponding response signal, or that the electrical parameters of the blood pressure detection circuit 100 itself have changed. This indicates that the blood pressure detection circuit 100 is in an abnormal state, thus confirming that the blood pressure monitor needs to be troubleshooted. When the external environment interferes with the signal, it will also interfere with the excitation signal. Since the response signal and the excitation signal maintain a corresponding relationship, the response signal can undergo the same or similar changes as the excitation signal after interference. Therefore, by having the differential circuit 30 receive and perform differential processing on the excitation signal and the response signal, the detection deviation caused by the interference of the external environment can be reduced, thereby improving the detection accuracy and stability of the blood pressure detection circuit 100.

[0061] In this embodiment, the signal generation circuit 10 may include an output port 11, which is electrically connected to the differential circuit 30 and the piezoelectric Korotkoff sound sensor 20. When the detection method is not performed, the output port 11 of the signal generation circuit 10 can be configured to a high-impedance state. This prevents the Korotkoff sound signal collected by the blood pressure monitor from flowing into the signal generation circuit 10, causing signal shunting, thereby ensuring the signal quality of the Korotkoff sound collected by the blood pressure monitor during blood pressure detection and improving the accuracy and stability of blood pressure detection.

[0062] Figure 4 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0063] In some embodiments, such as Figure 4 As shown, the method for detecting the working status of a blood pressure detection circuit may include the following steps: S10: The control signal generation circuit sends an excitation signal to the piezoelectric Korotkow tone sensor, so that the piezoelectric Korotkow tone sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; S21: The voltage amplitude of the response signal acquired by the differential circuit is differentially processed with the voltage amplitude of the reference signal to obtain the voltage difference, and the voltage difference is used as the differential result. S30: Determine the operating status of the blood pressure detection circuit based on the differential results.

[0064] In this embodiment, after the differential circuit acquires the response signal, it can perform differential processing between the voltage amplitude of the response signal and the voltage amplitude of the reference signal to obtain the voltage difference, which is then used as the differential result. Since the response signal is generated by the piezoelectric Korotkoff sound sensor after receiving the excitation signal, the voltage difference between the response signal and the excitation signal can be maintained within a certain range when the blood pressure detection circuit is in normal working condition. By checking whether the voltage difference is maintained within a certain range, it can be confirmed whether the blood pressure detection circuit is malfunctioning, thereby enabling the detection of the working status of the blood pressure detection circuit.

[0065] Figure 5 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0066] In some embodiments, such as Figure 5 As shown, the method for detecting the working status of a blood pressure detection circuit may include the following steps: S10: The control signal generation circuit sends an excitation signal to the piezoelectric Korotkow tone sensor, so that the piezoelectric Korotkow tone sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; S21: The voltage amplitude of the response signal acquired by the differential circuit is differentially processed with the voltage amplitude of the reference signal to obtain the voltage difference, and the voltage difference is used as the differential result. S311: Compare the differential result with the first voltage threshold and the second voltage threshold respectively; S312: When the differential result is less than the first voltage threshold, the blood pressure detection circuit is determined to be in a short circuit state. S313: When the differential result is greater than or equal to the first voltage threshold and less than or equal to the second voltage threshold, the blood pressure detection circuit is determined to be in normal condition. S314: When the differential result is greater than the second voltage threshold, the blood pressure detection circuit is determined to be in an open circuit state.

[0067] The first voltage threshold is less than the second voltage threshold, and the second voltage threshold can be less than the voltage amplitude of the reference signal.

[0068] In this embodiment, the differential circuit can obtain a voltage difference by differentially processing the received reference signal and response signal. This voltage difference is then transmitted to the processing circuit as the differential result. The processing circuit can compare the differential result with a first voltage threshold and a second voltage threshold, where the first voltage threshold can be less than the second voltage threshold, and the second voltage threshold can be less than the voltage amplitude of the reference signal. When the blood pressure detection circuit is short-circuited, the response signal received by the differential circuit is actually a signal directly input to the differential circuit by the signal generation circuit, bypassing the piezoelectric Korotkoff sensor through the short-circuit path. Since the response signal is a current signal generated by the piezoelectric Korotkoff sensor, its voltage value will be lower than the voltage value of the excitation signal. Therefore, when the signal received by the differential circuit changes from a normal response signal to an excitation signal, the voltage difference output by the differential circuit will decrease. The voltage difference range when the blood pressure detection circuit is short-circuited can be obtained through prior experiments, thereby determining the first voltage threshold. The blood pressure detection circuit is determined to be in a short-circuit state when the voltage difference is less than or equal to the first voltage threshold.

[0069] When the blood pressure detection circuit is in an open circuit state, the excitation signal cannot be transmitted to the piezoelectric Korotkoff sensor, or the response signal cannot be transmitted from the piezoelectric Korotkoff sensor to the processing circuit. Therefore, the differential circuit cannot receive the response signal. At this time, the differential result output by the differential circuit is close to the voltage parameter of the reference signal itself. Therefore, based on the voltage parameter of the reference signal itself, and after subtracting the signal fluctuation caused by some interference signals, the second voltage threshold can be determined by prior experimentation. And the blood pressure detection circuit is in an open circuit state if the voltage difference is greater than the second voltage threshold.

[0070] When the blood pressure detection circuit is in normal operation, the differential result can be within a normal range, which is greater than or equal to a first voltage threshold and less than a second voltage threshold. By comparing the voltage difference, which is the differential result, with the first and second voltage thresholds, it can be confirmed whether the differential circuit has received a response signal and the type of signal received, thereby determining the signal response of the piezoelectric Korotkoff sensor. Based on the signal response of the piezoelectric Korotkoff sensor, it can be determined whether the blood pressure detection circuit is malfunctioning, thus enabling the detection of the blood pressure detection circuit's operating status.

[0071] In some embodiments, the reference parameter can be an excitation signal. When the blood pressure detection circuit is short-circuited, both ports of the differential circuit will receive the excitation signal. Since the signal parameters of the two excitation signals are identical, the voltage difference obtained by the differential circuit will approach 0 volts. Furthermore, based on the same principle as above, the blood pressure detection circuit can be determined to be in a short-circuit state by the voltage difference being less than or equal to a first voltage threshold.

[0072] When the blood pressure detection circuit is in an open circuit state, the excitation signal cannot be transmitted to the piezoelectric Korotkoff sensor or the excitation signal cannot be transmitted from the piezoelectric Korotkoff sensor to the processing circuit. At this time, the differential circuit can only receive the excitation signal from the signal generation circuit, but cannot receive the response signal. The obtained differential result is close to the voltage parameter of the excitation signal itself. After subtracting the signal fluctuation caused by some interference signals, the second voltage threshold can be determined by pre-experimentation, and the blood pressure detection circuit is in an open circuit state by the voltage difference being greater than the second voltage threshold.

[0073] When the blood pressure detection circuit is in normal operation, the differential result can be within a normal range, which is greater than or equal to a first voltage threshold and less than a second voltage threshold. Since external environmental interference can affect the excitation signal, and because the response signal maintains a correspondence with the excitation signal, the response signal can undergo changes similar to or the same as the interfered excitation signal. Therefore, by having the differential circuit receive and perform differential processing on the excitation and response signals, the detection deviation caused by external environmental interference can be reduced, improving the accuracy and stability of the blood pressure detection circuit.

[0074] In some embodiments, when the blood pressure detection circuit is in a short-circuit state, both signals received by the differential circuit are excitation signals. The differential result should be 0 volts. However, due to factors such as the noise floor of the digital-to-analog converter circuit and parasitic parameters of the circuit, the processing circuit can still detect a weak voltage difference. For example, the actual voltage difference can be less than 0.01 volts.

[0075] In some embodiments, when the voltage amplitude of the excitation signal is 1.65 volts, the first voltage threshold can be 0.1 volts, and the second voltage threshold can be 1 volt. Setting the first voltage threshold to 0.1 volts avoids voltage fluctuations caused by factors such as background noise interference and external vibrations leading to current generation in the piezoelectric Korotkoff sensor. This ensures more stable confirmation that both signals received by the differential circuit are excitation signals, thus confirming that the blood pressure detection circuit is in a short-circuit state. Setting the second voltage threshold to 1 volt determines if the response signal voltage is weak or if no response signal is received, thus confirming that the blood pressure detection circuit is in an open-circuit state. This maintains the accuracy of detecting the operating status of the blood pressure detection circuit while reducing false alarms.

[0076] Figure 6 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0077] In some embodiments, such as Figure 6 As shown, the method for detecting the working status of a blood pressure detection circuit may include the following steps: S10: The control signal generation circuit sends an excitation signal to the piezoelectric Korotkow tone sensor, so that the piezoelectric Korotkow tone sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; S22: The current phase of the response signal acquired by the differential circuit is differentially processed with the current phase of the reference signal to obtain the phase difference, and the phase difference is used as the differential result. S30: Determine the operating status of the blood pressure detection circuit based on the differential results.

[0078] In this embodiment, after the differential circuit acquires the response signal, it can perform differential processing between the current phase of the response signal and the current phase of the reference signal to obtain the phase difference, which is then used as the differential result. Since the response signal is generated by the piezoelectric Korotkoff sound sensor after receiving the excitation signal, the phase difference between the response signal and the excitation signal can be maintained within a certain range when the blood pressure detection circuit is in normal working condition. By checking whether the phase difference is maintained within a certain range, it can be confirmed whether the blood pressure detection circuit is malfunctioning, thereby enabling the detection of the working status of the blood pressure detection circuit.

[0079] Figure 7 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0080] In some embodiments: such as Figure 7 As shown, the method for detecting the working status of a blood pressure detection circuit may include the following steps: S10: The control signal generation circuit sends an excitation signal to the piezoelectric Korotkow tone sensor, so that the piezoelectric Korotkow tone sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; S22: The current phase of the response signal acquired by the differential circuit is differentially processed with the current phase of the reference signal to obtain the phase difference, and the phase difference is used as the differential result. S321: Compare the difference result with the first phase threshold; S322: When the differential result is invalid, the blood pressure detection circuit is determined to be in an open circuit state. S323: When the differential result is less than or equal to the first phase threshold, the blood pressure detection circuit is determined to be in a short-circuit state. S324: When the differential result is greater than the first phase threshold, the blood pressure detection circuit is determined to be in normal condition.

[0081] In this embodiment, the differential circuit obtains the phase difference by differentially processing the received reference signal and response signal. This phase difference is then transmitted to the processing circuit as a differential result, which compares the result with a first phase threshold and a second phase threshold. When the blood pressure detection circuit is short-circuited, the response signal received by the differential circuit is actually a signal directly input to the differential circuit via the short-circuit path, bypassing the piezoelectric Korotkoff sensor. Under normal conditions, the response signal is generated by the excitation signal through a capacitor. The current phase of the response signal leads the current phase of the excitation signal, thus reducing the phase difference obtained by the differential circuit. The phase difference range when the blood pressure detection circuit is short-circuited can be obtained through prior experiments, thereby determining the first phase threshold. The blood pressure detection circuit is then determined to be in a short-circuit state if the differential result is less than or equal to the first phase threshold.

[0082] When the blood pressure detection circuit is in an open-circuit state, the excitation signal cannot be transmitted to the piezoelectric Korotkoff sensor, or the response signal cannot be transmitted from the piezoelectric Korotkoff sensor to the processing circuit. Therefore, the differential circuit cannot receive a response signal. Without a second signal, the phase difference is invalid; that is, the differential result is invalid. Therefore, the invalidity of the differential result indicates that the blood pressure detection circuit is in an open-circuit state.

[0083] When the blood pressure detection circuit is in normal operation, the differential result can be within a normal range, which can be greater than the first phase threshold. By comparing the phase difference, which is the differential result, with the first phase threshold, it can be confirmed whether the differential circuit has received a response signal and the type of signal received, thereby determining the signal response of the piezoelectric Korotkoff sensor. Based on the signal response of the piezoelectric Korotkoff sensor, it can be determined whether the blood pressure detection circuit is malfunctioning, thus enabling the detection of the blood pressure detection circuit's operating status.

[0084] Furthermore, since the equivalent capacitance parameter of the piezoelectric Korotkoff sensor itself affects the circuit phase of the response signal, structural abnormalities of the piezoelectric Korotkoff sensor itself, such as slight breakage of the piezoelectric ceramic sheet, can also be reflected in the phase of the response signal. This allows the piezoelectric Korotkoff sensor to feed back a response signal to a differential signal, and the current phase change of the response signal can be used to determine whether the structure of the piezoelectric Korotkoff sensor is in an abnormal state, thereby improving the detection accuracy and abnormality identification capability of the blood pressure detection circuit.

[0085] In some embodiments, the reference parameter can be an excitation signal. When the blood pressure detection circuit is short-circuited, both ports of the differential circuit will receive the excitation signal. Since the signal parameters of the two excitation signals are identical, the phase difference obtained by the differential circuit through differential processing will approach 0. Furthermore, based on the same principle as above, the blood pressure detection circuit can be determined to be in a short-circuit state by ensuring that the phase difference is less than or equal to a first phase threshold.

[0086] When the blood pressure detection circuit is in an open-circuit state, the excitation signal cannot be transmitted to the piezoelectric Korotkoff sound, or the excitation signal cannot be transmitted from the piezoelectric Korotkoff sensor to the processing circuit. Therefore, the differential circuit cannot receive a response signal. Without a second signal, the phase difference is invalid; that is, the differential result is invalid. Therefore, the invalidity of the differential result indicates that the blood pressure detection circuit is in an open-circuit state.

[0087] When the blood pressure detection circuit is in normal operation, the differential result can be within a normal range, which can be greater than the first phase threshold. Since external environmental interference can affect the excitation signal, and because the response signal maintains a correspondence with the excitation signal, the response signal can undergo changes similar to or the same as the interfered excitation signal. Therefore, by having the differential circuit receive and perform differential processing on the excitation and response signals, the detection deviation caused by external environmental interference can be reduced, improving the accuracy and stability of the blood pressure detection circuit.

[0088] Figure 8 This is a flowchart illustrating a method for detecting the operating status of a blood pressure detection circuit according to an exemplary embodiment.

[0089] In some embodiments, such as Figure 8 As shown, the method for detecting the working status of a blood pressure detection circuit may include the following steps: S01: When the detection method is not executed, the output port is configured to a high impedance state; S10: The control signal generation circuit sends an excitation signal to the piezoelectric Korotkow tone sensor, so that the piezoelectric Korotkow tone sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; S20: Obtain the differential result obtained by the differential circuit through differential processing of the acquired response signal and the reference signal; S30: Determine the operating status of the blood pressure detection circuit based on the differential results.

[0090] In this embodiment, the signal generation circuit includes an output port electrically connected to a differential circuit and a piezoelectric Korotkoff sound sensor. When the detection method is not performed, the output port of the signal generation circuit can be configured to a high-impedance state. This prevents the Korotkoff sound signal collected by the blood pressure monitor from flowing into the signal generation circuit, causing signal shunting, thereby ensuring the signal quality of the Korotkoff sound collected by the blood pressure monitor during blood pressure detection and improving the accuracy and stability of blood pressure detection.

[0091] In some embodiments, the above-described method for detecting the operating status of the blood pressure detection circuit can be executed at any time before the blood pressure monitor performs a blood pressure measurement, thereby allowing the blood pressure monitor to be checked in advance to avoid using a blood pressure monitor that is already in a faulty state for an invalid blood pressure measurement.

[0092] Figure 9 This is a block diagram illustrating the operating status detection device of a blood pressure detection circuit according to an exemplary embodiment.

[0093] Based on the same concept, such as Figure 9 As shown, this disclosure also provides a working state detection device for a blood pressure detection circuit, used to execute the working state detection method for the blood pressure detection circuit described above. The device includes: a detection unit 71, used to control the signal generation circuit to send an excitation signal to the piezoelectric Korotkoff sensor, so that the piezoelectric Korotkoff sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; and a processing unit 72, used to obtain the differential result obtained by the differential circuit based on the differential processing of the collected response signal and the reference signal, and determine the working state of the blood pressure detection circuit according to the differential result.

[0094] In some embodiments, the reference signal is an excitation signal or a preset reference signal.

[0095] In some embodiments, the processing unit 72 is used to determine the differential result in the following manner: performing differential processing based on the voltage amplitude of the response signal acquired by the differential circuit and the voltage amplitude of the reference signal to obtain the voltage difference, and using the voltage difference as the differential result.

[0096] In some embodiments, the processing unit 72 is configured to determine the operating state of the blood pressure detection circuit based on the differential result in the following manner: comparing the differential result with a first voltage threshold and a second voltage threshold respectively; determining that the blood pressure detection circuit is in a short-circuit state when the differential result is less than the first voltage threshold; determining that the blood pressure detection circuit is in a normal state when the differential result is greater than or equal to the first voltage threshold and less than or equal to the second voltage threshold; and determining that the blood pressure detection circuit is in an open-circuit state when the differential result is greater than the second voltage threshold, wherein the first voltage threshold is less than the second voltage threshold and the second voltage threshold is less than the voltage amplitude of the reference signal.

[0097] In some embodiments, the processing unit 72 is used to determine the differential result in the following manner: performing differential processing on the current phase of the response signal acquired by the differential circuit and the current phase of the reference signal to obtain the phase difference, and using the phase difference as the differential result.

[0098] In some embodiments, when the differential circuit fails to receive a response signal and the differential result is invalid, the processing unit 72 is used to determine the operating state of the blood pressure detection circuit based on the differential result in the following manner: comparing the differential result with a first phase threshold; determining that the blood pressure detection circuit is in an open-circuit state when the differential result is invalid; determining that the blood pressure detection circuit is in a short-circuit state when the differential result is less than or equal to the first phase threshold; and determining that the blood pressure detection circuit is in a normal state when the differential result is greater than the first phase threshold.

[0099] Regarding the working status detection device of the blood pressure detection circuit in the above embodiments, the specific way in which each module performs its operation has been described in detail in the embodiments of the relevant method, and will not be elaborated here.

[0100] Figure 10 This is a block diagram illustrating an electronic device according to an exemplary embodiment.

[0101] Based on the same concept, this disclosure also provides an electronic device, such as... Figure 10 As shown, one embodiment of this disclosure provides an electronic device 300. The electronic device 300 includes a memory 301, a processor 302, and an input / output (I / O) interface 303. The memory 301 stores instructions. The processor 302 executes the operating state detection method of the blood pressure detection circuit according to an embodiment of this disclosure by calling the instructions stored in the memory 301. The processor 302 is connected to both the memory 301 and the I / O interface 303, for example, via a bus system and / or other forms of connection mechanisms (not shown). The memory 301 can be used to store programs and data, including the program for the operating state detection method of the blood pressure detection circuit involved in the embodiments of this disclosure. The processor 302 executes various functional applications and data processing of the electronic device 300 by running the program stored in the memory 301.

[0102] In this embodiment of the disclosure, the processor 302 may be implemented in at least one of the following hardware forms: digital signal processor (DSP), field-programmable gate array (FPGA), and programmable logic array (PLA). The processor 302 may be one or a combination of several of the following: central processing unit (CPU) or other processing components with data processing capability and / or instruction execution capability.

[0103] The memory 301 in this embodiment may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD).

[0104] In this embodiment of the disclosure, the I / O interface 303 can be used to receive input instructions (such as numeric or character information, and to generate key signal inputs related to user settings and function control of the electronic device 300), and can also output various information (such as images or sounds) to the outside. In this embodiment of the disclosure, the I / O interface 303 may include one or more of the following: a physical keyboard, function keys (such as volume control keys, power buttons, etc.), a mouse, a joystick, a trackball, a microphone, a speaker, and a touch panel.

[0105] Based on the same concept, this disclosure also provides a non-transitory computer-readable storage medium including instructions, such as a memory including instructions, which can be executed by a processor of an electronic device to complete the above-described detection method. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0106] It is understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0107] The methods and apparatus disclosed herein can be implemented using standard programming techniques, and various method steps can be implemented using rule-based logic or other logic. It should also be noted that the terms "apparatus" and "module" as used herein and in the claims are intended to include implementations using one or more lines of software code and / or hardware implementations and / or devices for receiving input.

[0108] Any step, operation, or procedure described herein may be performed or implemented using one or more hardware or software modules, either alone or in combination with other devices. In one embodiment, the software module is implemented using a computer program product comprising a computer-readable medium containing computer program code, which is executable by a computer processor to perform any or all of the described steps, operations, or procedures.

[0109] The foregoing description of embodiments of this disclosure has been provided for purposes of illustration and description. The foregoing description is not exhaustive and is not intended to limit this disclosure to the exact forms disclosed; various modifications and variations may be made in accordance with the foregoing teachings, or may be derived from practice of this disclosure. These embodiments were chosen and described to illustrate the principles of this disclosure and its practical application, enabling those skilled in the art to utilize this disclosure in various implementations and with various modifications to suit the particular purpose conceived.

Claims

1. A blood pressure monitor, characterized in that, include: Signal generation circuit (10) is used to generate excitation signals; The blood pressure detection circuit (100) includes a piezoelectric Korotkoff sound sensor (20), which is electrically connected to the signal generation circuit (10) and outputs a response signal based on the excitation signal; The differential circuit (30) is electrically connected to the piezoelectric Korotkoff sound sensor (20) and is used to collect the response signal and perform differential processing on the collected response signal and the reference signal to obtain the differential result; The processing circuit (40) is electrically connected to the differential circuit (30) and is used to determine the working state of the blood pressure detection circuit (100) based on the differential result.

2. The blood pressure monitor according to claim 1, characterized in that, The differential circuit (30) includes: The first port (31) and the second port (32) are connected to the signal generation circuit (10) and the second port (32) is connected to the piezoelectric Korotkoff sound sensor (20). The differential result is obtained by differential processing of the signal received by the first port (31) and the signal received by the second port (32).

3. The blood pressure monitor according to claim 2, characterized in that, The blood pressure monitor also includes: A capacitive coupling circuit (50) is electrically connected to the signal generation circuit (10), and the capacitive coupling circuit (50) is used to couple the excitation signal to the piezoelectric Korotkoff sound sensor (20) and the first port (31).

4. The blood pressure monitor according to claim 1, characterized in that: The blood pressure detection circuit (100) also includes a microcontroller (60), which includes a signal generation module and a processing module; The microcontroller (60) is electrically connected to the piezoelectric Korotkoff sound sensor (20) and is used to determine blood pressure based on the Korotkoff sound signal collected by the piezoelectric Korotkoff sound sensor (20). The signal generation circuit (10) is the signal generation module; The processing circuit (40) is the processing module.

5. The blood pressure monitor according to claim 4, characterized in that, The blood pressure detection circuit (100) also includes an analog-to-digital converter circuit; The analog-to-digital conversion circuit is located between the microcontroller (60) and the piezoelectric Korotkoff sound sensor (20). The analog-to-digital conversion circuit is used to collect the Korotkoff sound signal and convert the Korotkoff sound signal into a digital signal. The analog-to-digital conversion circuit is the differential circuit (30).

6. The blood pressure monitor according to claim 2, characterized in that, The piezoelectric Korotkoff sound sensor (20) includes a first electrode (21) and a second electrode (22). The first electrode (21) is electrically connected to the signal generation circuit (10), and the second electrode (22) is connected to the second port (32) to transmit the response signal to the differential circuit (30).

7. A method for detecting the operating status of a blood pressure detection circuit, characterized in that, The method, applied to the blood pressure monitor according to any one of claims 1-6, comprises: The signal generation circuit is controlled to send an excitation signal to the piezoelectric Korotkoff sound sensor, so that the piezoelectric Korotkoff sound sensor generates a response signal according to the excitation signal and feeds back the response signal to the differential circuit; The differential result is obtained by the differential circuit through differential processing of the acquired response signal and the reference signal. Based on the difference results, the operating state of the blood pressure detection circuit is determined.

8. The method for detecting the working state of the blood pressure detection circuit according to claim 7, characterized in that, The reference signal is either the excitation signal or a preset reference signal.

9. The method for detecting the working state of the blood pressure detection circuit according to claim 7 or 8, characterized in that, The difference result is determined in the following manner: The voltage amplitude of the response signal acquired by the differential circuit is differentially processed with the voltage amplitude of the reference signal to obtain the voltage difference, and the voltage difference is used as the differential result.

10. The method for detecting the working state of the blood pressure detection circuit according to claim 9, characterized in that, Determining the operating state of the blood pressure detection circuit based on the difference result includes: The difference results are compared with the first voltage threshold and the second voltage threshold, respectively; When the difference result is less than the first voltage threshold, it is determined that the blood pressure detection circuit is in a short circuit state. When the difference result is greater than or equal to the first voltage threshold and less than or equal to the second voltage threshold, the blood pressure detection circuit is determined to be in normal condition. When the difference result is greater than the second voltage threshold, it is determined that the blood pressure detection circuit is in an open-circuit state. Wherein, the first voltage threshold is less than the second voltage threshold, and the second voltage threshold is less than the voltage amplitude of the reference signal.

11. The method for detecting the working state of the blood pressure detection circuit according to claim 7 or 8, characterized in that, The difference result is determined in the following manner: The current phase of the response signal acquired by the differential circuit is differentially processed with the current phase of the reference signal to obtain the phase difference, and the phase difference is used as the differential result.

12. The method for detecting the working state of the blood pressure detection circuit according to claim 11, characterized in that, When the differential circuit fails to receive a response signal, the differential result is invalid. Determining the operating state of the blood pressure detection circuit based on the differential result includes: The difference result is compared with a first phase threshold; When the difference result is an invalid value, it is determined that the blood pressure detection circuit is in an open circuit state. When the difference result is less than or equal to the first phase threshold, it is determined that the blood pressure detection circuit is in a short-circuit state. When the difference result is greater than the first phase threshold, the blood pressure detection circuit is determined to be in normal condition.

13. The method for detecting the working state of the blood pressure detection circuit according to claim 8, characterized in that, The signal generation circuit includes an output port, which is electrically connected to the differential circuit and the piezoelectric Korotkoff sound sensor. The method further includes: When the detection method is not executed, the output port is configured to a high impedance state.

14. An electronic device, characterized in that, The electronic device includes: Memory, used to store instructions; and A processor is configured to invoke instructions stored in the memory to execute the operating status detection method of the blood pressure detection circuit as described in any one of claims 7 to 13.

15. A computer-readable storage medium storing instructions, characterized in that, When the instruction is executed by the processor, the working state detection method of the blood pressure detection circuit as described in any one of claims 7 to 13 is performed.

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