Blood pressure measurement atrial fibrillation detection method and device based on dynamic deflation and medium

Abstract

The invention discloses a blood pressure measurement atrial fibrillation detection method and device based on dynamic deflation and a medium. The method comprises the steps that in the pressure reduction process of blood pressure measurement, a pulse sequence corresponding to target pressure is obtained, when the maximum amplitude appears, if the number of current amplitude sequences is smaller than a preset threshold value, the deflation speed is adjusted, the pulse sequence continues to be detected according to the new deflation speed, and after the amplitude sequences with the enough number are obtained, atrial fibrillation judgment is conducted; the device comprises a main control unit, a display unit, a pressurization part, a decompression part, a pressure pulse detection unit and an atrial fibrillation judgment unit. According to the scheme, enough amplitude sequence data can be obtained in the decompression process of single-time blood pressure measurement to judge whether atrial fibrillation exists or not, and the use experience of related applicable people is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of blood pressure measurement, and in particular to a method, device and medium for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation. Background Art

[0002] The statements in this section merely provide background technical information related to the present application and do not necessarily constitute prior art.

[0003] The blood pressure measurement equipment currently used can obtain the blood pressure measurement value through the pulse wave signal when measuring blood pressure. The pulse wave signal is a fluctuation caused by the contraction of the heart, which reflects the changes in blood pressure. In blood pressure measurement, the oscillometric method is usually used to detect the pulse wave signal. This method uses an inflated pressurized cuff to block arterial blood flow, and then gradually deflates the air to release the pressure, while detecting the gas pressure in the cuff and extracting the weak pulse wave signal; when the cuff pressure is much higher than the systolic pressure, the pulse wave disappears; as the cuff pressure drops to the systolic pressure, the pulse begins to appear; when the cuff pressure continues to drop, the pulse wave amplitude will gradually increase and reach the maximum value at the average pressure. Based on the relationship between the pulse wave amplitude and the cuff pressure, the blood pressure measurement value can be estimated.

[0004] By analyzing the pulse wave signal, the health status of the cardiovascular system can also be evaluated. For example, the electronic sphygmomanometer disclosed in the patent with publication number CN116634947A and the method for determining atrial fibrillation in the electronic sphygmomanometer adopt the method of summing up the data groups of more than three measurement opportunities of the tester, finding the average value of the pulse wave interval, and judging whether there is the possibility of atrial fibrillation based on whether there is irregular pulse wave data exceeding the preset allowable range relative to the average value in the summed data group. For another example, in the device and method for measuring blood pressure and indicating the presence of atrial fibrillation disclosed in the patent with publication number CN 113349751 A, the presence of atrial fibrillation is determined based on three independent sequences of pulse beats.

[0005] It is not difficult to find that in the existing technology of using a blood pressure measurement device to determine the presence of atrial fibrillation, it is necessary to obtain multiple independent sequences through multiple pressurization measurements to determine the presence of atrial fibrillation, which causes a bad experience for users and prolongs the measurement time. In particular, for people with a small pulse rate, the number of pulses that meet the determination of atrial fibrillation is often small, and the number of multiple pressurizations or multiple measurements required will be more, resulting in a worse measurement experience and a longer measurement time.

[0006] Therefore, how to solve the problem in the prior art that multiple independent data need to be obtained through multiple pressurization measurements to determine the presence of atrial fibrillation, resulting in poor user measurement experience and long measurement time, has become a topic to be studied and solved by the present invention. Summary of the invention

[0007] The purpose of the present invention is to provide a method, device and medium for detecting atrial fibrillation by measuring blood pressure based on dynamic deflation.

[0008] To achieve the above object, the first aspect of the present invention provides a method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation, the method comprising:

[0009] During the blood pressure reduction process of blood pressure measurement, the pulse sequence corresponding to the target pressure is obtained. When the maximum amplitude appears, if the number of current amplitude sequences is less than the preset threshold, the deflation speed is adjusted and the pulse sequence is continued to be detected according to the new deflation speed;

[0010] After obtaining a sufficient number of amplitude sequences, atrial fibrillation is judged, and a difference sequence of pulse intervals is calculated based on the obtained multiple pulse amplitude sequences to determine whether atrial fibrillation exists, and the difference sequence is divided into multiple small sequences to determine whether atrial fibrillation exists.

[0011] The second aspect of the present invention provides a blood pressure measurement device, which includes a main control unit, a display unit, a pressurizing unit, a decompressing unit, a pressure pulse detection unit and an atrial fibrillation determination unit; wherein,

[0012] The pressure pulse detection unit is used to obtain the pulse sequence corresponding to the target pressure and transmit it to the main control unit for calculation and processing;

[0013] The main control unit is electrically connected to the display unit, the pressure pulse detection unit, the atrial fibrillation determination unit, the pressurization unit and the decompression unit. The main control unit controls the pressurization unit to pressurize to a preset target pressure, and then controls the decompression unit to slowly reduce the pressure. In a single decompression process of slowly reducing the pressure, a sufficient number of pulse interval sequences are obtained, and when the maximum amplitude appears, if the current number of amplitude sequences is less than a preset threshold, the main control unit controls the decompression unit to adjust the deflation speed, and continues to detect the pulse sequence according to the new deflation speed;

[0014] The atrial fibrillation determination unit determines atrial fibrillation after acquiring a sufficient number of amplitude sequences, so as to finally determine whether atrial fibrillation exists;

[0015] The pressurizing unit is used to control the cuff airbag pressurization to pressurize the cuff airbag to a target pressure;

[0016] The decompression unit is used to slowly deflate the cuff airbag during the decompression process, and to adjust the deflation speed under the control of the main control unit;

[0017] The display unit is used to display the blood pressure result calculated by the main control unit, the atrial fibrillation result determined by the atrial fibrillation determination unit, and the status information of the measurement process.

[0018] The third aspect of the present invention proposes a readable storage medium, on which a control program is stored. When the control program is executed by a main control unit, the main control unit executes the steps of the blood pressure measurement and atrial fibrillation detection method based on dynamic deflation as described in the first aspect.

[0019] The relevant contents of the present invention are explained as follows:

[0020] 1. The implementation of the above technical solution of the present invention aims at the problem that the existing technology needs to obtain multiple independent data through multiple pressurization measurements to determine the existence of atrial fibrillation, which makes the user's measurement experience poor and the measurement time long, and innovatively designs a method for detecting atrial fibrillation based on blood pressure measurement based on dynamic deflation, a blood pressure measurement device using this method, and a readable storage medium. In the scheme of the method for detecting atrial fibrillation based on blood pressure measurement based on dynamic deflation, the deflation speed is adjusted according to the number of pulse wave sequences when the maximum amplitude appears, ensuring that a single measurement can obtain enough pulse wave sequences, avoiding the discomfort caused by multiple pressurizations, and eliminating the need for users to experience the pressurization and decompression process of multiple blood pressure measurements, thereby avoiding user discomfort and reducing the time for judging atrial fibrillation. A pulse interval difference sequence is calculated based on the multiple pulse interval sequences obtained, and the pulse interval difference sequence is used to determine whether the change in the pulse sequence is greater than the pulse change threshold, so as to further ensure the accuracy and reference of the multiple pulse interval sequence data obtained, so as to provide data guarantee for subsequent judgments and avoid the occurrence of misjudgments; the pulse interval difference sequence is evenly distributed into multiple small sequences, and then each small sequence is judged and counted, so as to further achieve the purpose of using the data obtained in the decompression process of a single blood pressure measurement to judge the presence of atrial fibrillation, and this process more accurately and finely judges the "digital information" presented in the pulse amplitude signal sequence corresponding to atrial fibrillation, so as to further avoid misjudgment of atrial fibrillation. Through the application of the above-mentioned blood pressure measurement atrial fibrillation detection method and device based on dynamic deflation, it is possible to obtain sufficient amplitude sequence data during the decompression process of a single blood pressure measurement to determine whether atrial fibrillation exists. This method is particularly suitable for people with a smaller pulse rate, so that even if the number of pulses that meet the requirements for atrial fibrillation is small, it is possible to obtain an amplitude sequence sufficient for atrial fibrillation during a single blood pressure measurement, which greatly improves the user experience of the relevant applicable population.

[0021] 2. In the first aspect of the above technical solution, during the blood pressure lowering process of blood pressure measurement, the original deflation speed and the adjusted deflation speed are in a linear relationship to ensure the smoothness of the blood pressure lowering process after adjusting the deflation speed. This avoids excessive changes that may lead to inaccurate measured pulse sequences and the discomfort during the blood pressure lowering process. Thus, it provides good basic data information to ensure the accuracy of the data obtained after adjusting the deflation speed in a single measurement.

[0022] 3. In the first aspect of the above technical solution, the deflation speed of the valve is adjusted according to the number of pulse sequences before the maximum amplitude appears, so as to adjust the deflation speed according to the actually required amplitude sequence. While satisfying a sufficient number of amplitude sequences, the efficiency of implementing the atrial fibrillation detection method during the blood pressure measurement process is improved.

[0023] 4. In the first aspect of the above technical solution, for the confirmation of the maximum amplitude, the following method is adopted:

[0024] During the slow deflation process of blood pressure measurement, the maximum value of the amplitude of the obtained pulse sequence Ai is searched. Here, i is a positive integer from 1 to n, representing the position of the pulse sequence on the time axis. The maximum amplitude is denoted as Amax. Set the maximum amplitude judgment adjustment coefficient R and the maximum amplitude judgment times threshold Nr. If the number of amplitudes Ai < Amax * R after the maximum amplitude is greater than or equal to Nr, it indicates the appearance of the maximum amplitude. Through the implementation of this step, through the accurate and reliable confirmation of the maximum amplitude, the accuracy and referenceability of the number of obtained amplitude sequences are further guaranteed, providing data guarantee for subsequent judgments and avoiding misjudgments. More specifically, R takes values from 0.4 to 1.0, and Nr ≥ 1. For example, R can take 0.8 and Nr can take 2, so as to make the values of the maximum amplitude judgment adjustment coefficient R and the maximum amplitude judgment times threshold Nr more reasonable, and balance the time spent in the decompression process of a single blood pressure measurement and the number of required pulse sequences.

[0025] 5. In the first aspect of the above technical solution, set a preset threshold Nt. The preset threshold Nt is the minimum sequence threshold for atrial fibrillation judgment. If the maximum amplitude appears, judge whether the number k of the amplitude sequence is less than the preset threshold Nt, and adjust the deflation speed of the valve to V1. V1 is in a linear relationship with the original deflation speed V, expressed as: V1 = B * k / Nt * V, where B is the speed adjustment coefficient and B takes a number greater than zero. Through the above adjustment method of the deflation speed, the adjusted deflation speed is in a linear relationship with the original deflation speed, and is associated with both the number k of the amplitude sequence and the preset threshold Nt, so as to enable the adjusted deflation speed to continue to obtain a sufficient number of amplitude sequences, avoid the failure of this atrial fibrillation detection due to insufficient number of amplitude sequences, improve efficiency, reduce detection time, and ensure the accuracy of atrial fibrillation detection is improved.

[0026] 6. In the first aspect of the above technical solution, the step of calculating the difference sequence of pulse intervals based on the acquired multiple pulse amplitude sequences to determine whether atrial fibrillation exists includes the following steps:

[0027] Calculate pulse interval difference sequence;

[0028] Calculate the average interval change and average interval of the pulse interval sequence;

[0029] Calculate the average change of the pulse interval sequence and the overall change of the pulse interval sequence;

[0030] The pulse change thresholds set include an average threshold and an overall threshold, and it is determined whether the average change of the pulse interval sequence is greater than the average threshold and the overall change of the pulse interval sequence is greater than the overall threshold;

[0031] If the answer is no, it is determined that atrial fibrillation does not exist. If the answer is yes, it is determined that atrial fibrillation exists and the difference sequence is divided into a plurality of small sequences to determine whether atrial fibrillation exists.

[0032] Through the implementation of this step, the pulse interval difference sequence is calculated based on the multiple pulse interval sequences obtained, and the pulse interval difference sequence is used to determine whether the change in the pulse sequence is greater than the pulse change threshold, thereby further ensuring the accuracy and referenceability of the multiple pulse interval sequence data obtained, thereby providing data guarantee for subsequent judgments and avoiding the occurrence of misjudgments.

[0033] 7. In the first aspect of the above technical solution, the step of calculating the difference sequence of pulse intervals based on the acquired multiple pulse amplitude sequences to determine whether atrial fibrillation exists includes the following steps:

[0034] Calculate the pulse interval difference sequence Ri, where Ri = (ΔAi+1)-(ΔAi);

[0035] The average interval change St is calculated by the pulse interval difference sequence Ri, Where n is the number of pulse interval difference sequences Ri; the average interval amount Sr is calculated by the pulse interval difference sequence Ri,

[0036] Calculate the average change of the pulse interval sequence ΔS, ΔS = St / Sr; calculate the overall change of the pulse interval sequence ΔD,

[0037] The pulse change thresholds set include an average threshold ΔSk and an overall threshold ΔDk, and it is judged whether the average change ΔS is greater than the average threshold ΔSk and the overall change ΔD is greater than the overall threshold ΔDk, where ΔSk and ΔDk are both greater than 0;

[0038] If ΔS>ΔSk and ΔD>ΔDk cannot be satisfied simultaneously, it is judged that atrial fibrillation does not exist. If ΔS>ΔSk and ΔD>ΔDk are satisfied simultaneously, it is judged that atrial fibrillation exists and the difference sequence is distributed into multiple small sequences to determine whether atrial fibrillation exists.

[0039] Through the implementation of this step, the application settings of algorithms and parameters are reasonable and scientific, and the steps and applications therein can provide data guarantee for subsequent judgments.

[0040] 8. In the first aspect of the above technical solution, the step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences comprises the following steps:

[0041] Evenly distribute the pulse interval difference sequence into multiple small sequences;

[0042] Calculate the average change of each small sequence and the overall change of each small sequence respectively;

[0043] Determine whether the average change of the small sequence is greater than the average threshold and the overall change of the small sequence is greater than the overall threshold;

[0044] If both the average change of the small sequence is greater than the average threshold and the overall change of the small sequence is greater than the overall threshold, the sequence result of the small sequence is counted; if not, it is not counted;

[0045] Calculate sequence results and values;

[0046] Determine whether the sequence result and value are greater than the result setting value;

[0047] If the sum of the sequence results is greater than the result setting value, it is determined that atrial fibrillation exists; if the sum of the sequence results is less than the result setting value, atrial fibrillation does not exist.

[0048] By implementing this step, the purpose of using the data obtained during the decompression process of a single blood pressure measurement to determine the presence of atrial fibrillation is further achieved, and this process more accurately and finely determines the "digital information" presented in the pulse amplitude signal sequence corresponding to atrial fibrillation, thereby further avoiding misjudgment of atrial fibrillation.

[0049] 9. In the first aspect of the above technical solution, the step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences comprises the following steps:

[0050] The pulse interval difference sequence is evenly divided into m small sequences;

[0051] Calculate the average change ΔSj of each small sequence and the overall change ΔDj of each small sequence respectively, where j ranges from 1 to m;

[0052] Determine whether the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk;

[0053] If the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk, the sequence result of the small sequence is counted as 1, otherwise, it is not counted;

[0054] Calculate sequence results and values;

[0055] Determine whether the sequence result and value are greater than the result setting value C, where C ranges from 1 to m;

[0056] If the sum of the sequence results is greater than the result setting value, it is determined that atrial fibrillation exists; if the sum of the sequence results is less than the result setting value, atrial fibrillation does not exist.

[0057] Through the implementation of this step, the numerical value setting is reasonable and scientific, the pulse interval sequence obtained by a single blood pressure measurement can be used for judgment, and misjudgment can be avoided.

[0058] Due to the application of the above scheme, the present invention has the following advantages and effects compared with the prior art:

[0059] 1. Through the implementation of the technical solution of the present invention, in order to solve the problem that the existing technology requires multiple pressurization measurements to obtain multiple independent data to determine the existence of atrial fibrillation, resulting in poor user measurement experience and long measurement time, an innovative method for atrial fibrillation detection based on dynamic deflation blood pressure measurement, a blood pressure measurement device using this method, and a readable storage medium are designed to ensure that a single measurement can obtain enough pulse wave sequences.

[0060] 2. Through the implementation of the technical solution of the present invention, in the solution of the blood pressure measurement and atrial fibrillation detection method based on dynamic deflation, the deflation speed is adjusted according to the number of pulse wave sequences when the maximum amplitude appears, ensuring that a single measurement can obtain enough pulse wave sequences, avoiding the discomfort caused by multiple pressurizations, and eliminating the need for users to go through the pressurization and decompression process of multiple blood pressure measurements, thereby avoiding user discomfort and reducing the time for atrial fibrillation judgment.

[0061] 3. Through the implementation of the technical solution of the present invention, a pulse interval difference sequence is calculated based on multiple pulse interval sequences obtained, and the pulse interval difference sequence is used to determine whether the change in the pulse sequence is greater than the pulse change threshold, thereby further ensuring the accuracy and reference of the multiple pulse interval sequence data obtained, thereby providing data guarantee for subsequent judgments and avoiding the occurrence of misjudgments; the pulse interval difference sequence is evenly distributed into multiple small sequences, and then each small sequence is judged and counted, thereby further achieving the purpose of using the data obtained during the decompression process of a single blood pressure measurement to determine the presence of atrial fibrillation, and the process more accurately and finely judges the "digital information" presented in the pulse amplitude signal sequence corresponding to atrial fibrillation, thereby further avoiding misjudgments of atrial fibrillation.

[0062] 4. In summary, through the application of the above-mentioned blood pressure measurement atrial fibrillation detection method and device based on dynamic deflation, it is possible to obtain sufficient amplitude sequence data during the decompression process of a single blood pressure measurement to determine whether atrial fibrillation exists or not. This method is particularly suitable for people with a smaller pulse rate, so that even if the number of pulses that meet the judgment of atrial fibrillation is small, it is possible to obtain sufficient amplitude sequence for atrial fibrillation during a single blood pressure measurement, which greatly improves the user experience of the relevant applicable population. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] Figure 1 This is a three-dimensional schematic diagram of the appearance of a blood pressure measurement device according to an embodiment of the present invention;

[0064] Figure 2 is a block diagram of the composition of a blood pressure measurement device according to an embodiment of the present invention;

[0065] Figure 3 The flowchart of adjusting the valve deflation speed according to an embodiment of the present invention is shown.

[0066] Figure 4 The pulse waveform detection and judgment process of the embodiment of the present invention;

[0067] Figure 5 This is a flow chart of determining the presence of atrial fibrillation using a difference sequence according to an embodiment of the present invention;

[0068] Figure 6 This is a flow chart of a small sequence for determining the presence of atrial fibrillation according to an embodiment of the present invention;

[0069] Figure 7 Schematic diagram of characteristic points of the measurement process. DETAILED DESCRIPTION

[0070] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0071] The terms used herein are only for describing specific embodiments and are not intended to be limiting of the present invention. Singular forms such as "a", "this", "here", "this" and "the" as used herein also include plural forms.

[0072] The terms “first”, “second”, etc. used in this document do not specifically refer to an order or sequence, nor are they used to limit the present case. They are only used to distinguish components or operations described with the same technical terms.

[0073] As used herein, “connected” or “positioned” may refer to two or more components or devices being in direct physical contact with each other, or being in indirect physical contact with each other, or may refer to two or more components or devices operating or moving with each other.

[0074] The terms “include,” “including,” “have,” etc. used in this document are open-ended terms, meaning including but not limited to.

[0075] The terms used herein generally have the ordinary meanings of each term used in the art, in the context of the present invention, and in the specific context, unless otherwise noted. Certain terms used to describe the present invention will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art regarding the description of the present invention.

[0076] The present invention aims to provide a solution for further determining the presence of atrial fibrillation based on a pulse interval sequence obtained during a single blood pressure measurement during blood pressure measurement, so as to solve the problem of requiring multiple pressurized measurements to obtain multiple independent pulses to determine the presence of atrial fibrillation, which results in a poor user experience.

[0077] Embodiment 1: Embodiment 1 of the present invention proposes a method for atrial fibrillation detection based on dynamic deflation in blood pressure measurement, which is used to determine whether atrial fibrillation exists during blood pressure measurement. The method comprises:

[0078] During the blood pressure reduction process of blood pressure measurement, the pulse sequence corresponding to the target pressure is obtained. When the maximum amplitude appears, if the number of current amplitude sequences is less than the preset threshold, the deflation speed is adjusted and the pulse sequence is continued to be detected according to the new deflation speed;

[0079] After obtaining a sufficient number of amplitude sequences, atrial fibrillation is judged, and a difference sequence of pulse intervals is calculated based on the obtained multiple pulse amplitude sequences to determine whether atrial fibrillation exists, and the difference sequence is divided into multiple small sequences to determine whether atrial fibrillation exists.

[0080] In the scheme of the atrial fibrillation detection method for blood pressure measurement based on dynamic deflation, the deflation speed is adjusted according to the number of pulse wave sequences when the maximum amplitude occurs, to ensure that a single measurement can obtain enough pulse wave sequences, avoid the discomfort caused by multiple pressurization, and do not require the user to go through the pressurization and decompression process of multiple blood pressure measurements, thereby avoiding user discomfort and reducing the time for atrial fibrillation judgment. A pulse interval difference sequence is calculated based on the multiple pulse interval sequences obtained, and the pulse interval difference sequence is used to determine whether the change in the pulse sequence is greater than the pulse change threshold, so as to further ensure the accuracy and reference of the multiple pulse interval sequence data obtained, so as to provide data guarantee for subsequent judgments and avoid the occurrence of misjudgments; the pulse interval difference sequence is evenly distributed into multiple small sequences, and then each small sequence is judged and counted, so as to further achieve the purpose of using the data obtained in the decompression process of a single blood pressure measurement to judge the presence of atrial fibrillation, and this process more accurately and finely judges the "digital information" presented in the pulse amplitude signal sequence corresponding to atrial fibrillation, so as to further avoid misjudgment of atrial fibrillation.

[0081] In the first embodiment of the present invention, during the blood pressure reduction process of blood pressure measurement, the original deflation speed and the adjusted deflation speed are in a linear relationship to ensure the smoothness of the pressure reduction process after the deflation speed is adjusted. This avoids excessive changes that lead to inaccurate pulse sequence measurements and discomfort during the pressure reduction process. This ensures that the data obtained after the subsequent adjustment of the deflation speed after a single measurement is still accurate, providing good data basic information.

[0082] In the first embodiment of the present invention, the deflation speed of the valve is adjusted according to the number of pulse sequences before the maximum amplitude appears, so as to adjust the deflation speed according to the actual required amplitude sequence, thereby improving the efficiency of the atrial fibrillation detection method during the blood pressure measurement process while satisfying a sufficient number of amplitude sequences.

[0083] In the first embodiment of the present invention, the following method is used to confirm the maximum amplitude:

[0084] During the slow deflation process of blood pressure measurement, find the maximum amplitude of the acquired pulse sequence Ai. Here, i is a positive integer from 1 to n, representing the position of the pulse sequence on the time axis. The maximum amplitude is denoted as Amax. Set the maximum amplitude judgment adjustment coefficient R and the maximum amplitude judgment times threshold Nr. If the number of amplitudes Ai < Amax * R after the maximum amplitude is greater than or equal to Nr, it indicates the occurrence of the maximum amplitude. Through the implementation of this step, by accurately and reliably confirming the maximum amplitude, the accuracy and referenceability of the number of acquired amplitude sequences are further guaranteed, providing data support for subsequent judgments and avoiding misjudgments. More specifically, R ranges from 0.4 to 1.0, and Nr ≥ 1. For example, R can be taken as 0.8 and Nr as 2, so that the values of the maximum amplitude judgment adjustment coefficient R and the maximum amplitude judgment times threshold Nr are more reasonable, and the time spent on the decompression process of a single blood pressure measurement and the number of required acquired pulse sequences can be balanced.

[0085] In the first embodiment of the present invention, set a preset threshold Nt. The preset threshold Nt is the minimum sequence threshold for atrial fibrillation judgment. If the maximum amplitude appears, judge whether the number k of the amplitude sequence is less than the preset threshold Nt, and adjust the deflation speed of the valve to V1. V1 has a linear relationship with the original deflation speed V, expressed as: V1 = B * k / Nt * V, where B is the speed adjustment coefficient and B takes a number greater than zero. Through the above method of adjusting the deflation speed, the adjusted deflation speed has a linear relationship with the original deflation speed, and the adjusted deflation speed is associated with both the number k of the amplitude sequence and the preset threshold Nt, so that the adjusted deflation speed can continue to acquire a sufficient number of amplitude sequences, avoiding the failure of this atrial fibrillation detection due to insufficient number of amplitude sequences, improving efficiency, reducing detection time, and ensuring the accuracy of atrial fibrillation detection is improved.

[0086] In the first embodiment of the present invention, in the step of calculating the difference sequence of pulse intervals based on the acquired multiple pulse amplitude sequences to determine whether there is atrial fibrillation, the following steps are included:

[0087] Calculate the difference sequence of pulse intervals;

[0088] Calculate the average interval change amount and average interval amount of the pulse interval sequence;

[0089] Calculate the average change amount of the pulse interval sequence and the overall change amount of the pulse interval sequence;

[0090] The set pulse change thresholds include an average threshold and an overall threshold. Judge whether the average change amount of the pulse interval sequence is greater than the average threshold and the overall change amount of the pulse interval sequence is greater than the overall threshold;

[0091] If the answer is no, it is determined that atrial fibrillation does not exist. If the answer is yes, it is determined that atrial fibrillation exists and the difference sequence is divided into a plurality of small sequences to determine whether atrial fibrillation exists.

[0092] Through the implementation of this step, the pulse interval difference sequence is calculated based on the multiple pulse interval sequences obtained, and the pulse interval difference sequence is used to determine whether the change in the pulse sequence is greater than the pulse change threshold, thereby further ensuring the accuracy and referenceability of the multiple pulse interval sequence data obtained, thereby providing data guarantee for subsequent judgments and avoiding the occurrence of misjudgments.

[0093] In the first embodiment of the present invention, the step of calculating the difference sequence of pulse intervals based on the acquired multiple pulse amplitude sequences to determine whether atrial fibrillation exists includes the following steps:

[0094] Calculate the pulse interval difference sequence Ri, where Ri = (ΔAi+1)-(ΔAi);

[0095] The average interval change St is calculated by the pulse interval difference sequence Ri, Where n is the number of pulse interval difference sequences Ri; the average interval amount Sr is calculated by the pulse interval difference sequence Ri,

[0096] Calculate the average change of the pulse interval sequence ΔS, ΔS = St / Sr; calculate the overall change of the pulse interval sequence ΔD,

[0097] The pulse change thresholds set include an average threshold ΔSk and an overall threshold ΔDk, and it is judged whether the average change ΔS is greater than the average threshold ΔSk and the overall change ΔD is greater than the overall threshold ΔDk, where ΔSk and ΔDk are both greater than 0;

[0098] If ΔS>ΔSk and ΔD>ΔDk cannot be satisfied simultaneously, it is judged that atrial fibrillation does not exist. If ΔS>ΔSk and ΔD>ΔDk are satisfied simultaneously, it is judged that atrial fibrillation exists and the difference sequence is distributed into multiple small sequences to determine whether atrial fibrillation exists.

[0099] Through the implementation of this step, the application settings of algorithms and parameters are reasonable and scientific, and the steps and applications therein can provide data guarantee for subsequent judgments.

[0100] In the first embodiment of the present invention, the step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences includes the following steps:

[0101] Evenly distribute the pulse interval difference sequence into multiple small sequences;

[0102] Calculate the average change of each small sequence and the overall change of each small sequence respectively;

[0103] Determine whether the average change of the small sequence is greater than the average threshold and the overall change of the small sequence is greater than the overall threshold;

[0104] If both the average change of the small sequence is greater than the average threshold and the overall change of the small sequence is greater than the overall threshold, the sequence result of the small sequence is counted; if not, it is not counted;

[0105] Calculate sequence results and values;

[0106] Determine whether the sequence result and value are greater than the result setting value;

[0107] If the sum of the sequence results is greater than the result setting value, it is determined that atrial fibrillation exists; if the sum of the sequence results is less than the result setting value, atrial fibrillation does not exist.

[0108] By implementing this step, the purpose of using the data obtained during the decompression process of a single blood pressure measurement to determine the presence of atrial fibrillation is further achieved, and this process more accurately and finely determines the "digital information" presented in the pulse amplitude signal sequence corresponding to atrial fibrillation, thereby further avoiding misjudgment of atrial fibrillation.

[0109] In the first embodiment of the present invention, the step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences includes the following steps:

[0110] The pulse interval difference sequence is evenly divided into m small sequences;

[0111] Calculate the average change ΔSj of each small sequence and the overall change ΔDj of each small sequence respectively, where j ranges from 1 to m;

[0112] Determine whether the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk;

[0113] If the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk, the sequence result of the small sequence is counted as 1, otherwise, it is not counted;

[0114] Calculate sequence results and values;

[0115] Determine whether the sequence result and value are greater than the result setting value C, where C ranges from 1 to m;

[0116] If the sum value of the sequence results is greater than the set result value, it is determined that atrial fibrillation exists. If the sum value of the sequence results is less than the set result value, atrial fibrillation does not exist.

[0117] Through the implementation of this step, the numerical settings are reasonable and scientific. It can use the pulse interval sequence obtained from a single blood pressure measurement for judgment and can avoid misjudgment.

[0118] Next, a more detailed and preferred embodiment will be used to further illustrate Embodiment 1 of the present invention.

[0119] The preferred embodiment of the atrial fibrillation detection method for blood pressure measurement based on dynamic deflation includes the following detailed steps.

[0120] During the blood pressure reduction process of blood pressure measurement, obtain the pulse sequence corresponding to the target pressure. During the slow deflation process of blood pressure measurement, find the maximum amplitude of the obtained pulse sequence Ai. i is a positive integer from 1 to n, representing the position of the pulse sequence on the time axis. The maximum amplitude is denoted as Amax. Set the maximum amplitude judgment adjustment coefficient R and the maximum amplitude judgment number threshold Nr. If the number of amplitudes Ai < Amax * R after the maximum amplitude is greater than or equal to Nr, it means that the maximum amplitude appears. When the maximum amplitude appears, if the number of the current amplitude sequence is less than the preset threshold, set the preset threshold Nt. The preset threshold Nt is the minimum sequence threshold for atrial fibrillation judgment. If the maximum amplitude appears, judge whether the number k of the amplitude sequence is less than the preset threshold Nt, and adjust the deflation speed of the valve to V1. V1 has a linear relationship with the original deflation speed V, expressed as: V1 = B * k / Nt * V, where B is the speed adjustment coefficient and B takes a number greater than zero. Adjust the deflation speed and continue to detect the pulse sequence according to the new deflation speed.

[0121] After obtaining a sufficient number of amplitude sequences, judge atrial fibrillation. Calculate the difference sequence of the pulse intervals based on the obtained multiple pulse amplitude sequences to determine whether atrial fibrillation exists, and divide the difference sequence into multiple small sequences to determine whether atrial fibrillation exists.

[0122] In the step of calculating the difference sequence of the pulse intervals based on the obtained multiple pulse amplitude sequences to determine whether atrial fibrillation exists, the following steps are included:

[0123] Calculate the pulse interval difference sequence Ri, where Ri = (ΔAi + 1) - (ΔAi);

[0124] Calculate the average interval change amount St through the pulse interval difference sequence Ri, where n is the number of the pulse interval difference sequence Ri; calculate the average interval amount Sr through the pulse interval difference sequence Ri,

[0125] Calculate the average change of the pulse interval sequence ΔS, ΔS = St / Sr; calculate the overall change of the pulse interval sequence ΔD,

[0126] The pulse change thresholds set include an average threshold ΔSk and an overall threshold ΔDk, and it is judged whether the average change ΔS is greater than the average threshold ΔSk and the overall change ΔD is greater than the overall threshold ΔDk, where ΔSk and ΔDk are both greater than 0;

[0127] If ΔS>ΔSk and ΔD>ΔDk cannot be satisfied simultaneously, it is judged that atrial fibrillation does not exist. If ΔS>ΔSk and ΔD>ΔDk are satisfied simultaneously, it is judged that atrial fibrillation exists and the difference sequence is distributed into multiple small sequences to determine whether atrial fibrillation exists.

[0128] The step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences includes the following steps:

[0129] The pulse interval difference sequence is evenly divided into m small sequences;

[0130] Calculate the average change ΔSj of each small sequence and the overall change ΔDj of each small sequence respectively, where j ranges from 1 to m;

[0131] Determine whether the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk;

[0132] If the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk, the sequence result of the small sequence is counted as 1, otherwise, it is not counted;

[0133] Calculate sequence results and values;

[0134] Determine whether the sequence result and value are greater than the result setting value C, where C ranges from 1 to m;

[0135] If the sum of the sequence results is greater than the result setting value, it is determined that atrial fibrillation exists; if the sum of the sequence results is less than the result setting value, atrial fibrillation does not exist.

[0136] Embodiment 2, as Figure 1 , Figure 2 As shown, the second embodiment of the present invention proposes a blood pressure measurement device, which is used for the blood pressure measurement in the method of the first embodiment of the present invention to determine the presence of atrial fibrillation. The device includes a main control unit, a display unit, a pressurizing unit, a decompressing unit, a pressure pulse detection unit and an atrial fibrillation determination unit;

[0137] The pressure pulse detection unit is used to obtain the pulse sequence corresponding to the target pressure and transmit it to the main control unit for calculation and processing;

[0138] The main control unit is electrically connected to the display unit, the pressure pulse detection unit, the atrial fibrillation determination unit, the pressurization unit and the decompression unit. The main control unit controls the pressurization unit to pressurize to a preset target pressure, and then controls the decompression unit to slowly reduce the pressure. In a single decompression process of slowly reducing the pressure, a sufficient number of pulse interval sequences are obtained, and when the maximum amplitude appears, if the current number of amplitude sequences is less than a preset threshold, the main control unit controls the decompression unit to adjust the deflation speed, and continues to detect the pulse sequence according to the new deflation speed;

[0139] The atrial fibrillation determination unit determines atrial fibrillation after acquiring a sufficient number of amplitude sequences, so as to finally determine whether atrial fibrillation exists;

[0140] The pressurizing unit is used to control the cuff airbag pressurization to pressurize the cuff airbag to a target pressure;

[0141] The decompression unit is used to slowly deflate the cuff airbag during the decompression process, and to adjust the deflation speed under the control of the main control unit;

[0142] The display unit is used to display the blood pressure result calculated by the main control unit, the atrial fibrillation result determined by the atrial fibrillation determination unit, and the status information of the measurement process.

[0143] Embodiment three, embodiment three of the present invention further proposes a readable storage medium, on which a control program is stored. When the control program is executed by a main control unit, the main control unit executes the steps of atrial fibrillation detection based on dynamic deflation blood pressure measurement as described in embodiment one of the present invention.

[0144] Embodiment 4. Embodiment 4 of the present invention further proposes a blood pressure meter that uses a blood pressure measuring device to measure blood pressure and determines whether atrial fibrillation exists during blood pressure measurement. The blood pressure measuring device includes a main control unit, a pressurizing unit, a decompressing unit, a pressure pulse detection unit, and an atrial fibrillation determination unit.

[0145] The pressure pulse detection unit is used to obtain multiple target pressure sequences and pulse amplitude signal sequences corresponding to the target pressures during the decompression process, and transmit them to the main control unit for calculation and processing;

[0146] The main control unit is electrically connected to the pressure pulse detection unit, the atrial fibrillation determination unit, the pressurization unit and the decompression unit. The main control unit controls the pressurization unit to pressurize to a preset pressure, and then controls the decompression unit to slowly decompress. In a single decompression process of slowly decompressing, a sufficient number of pulse interval sequences are obtained.

[0147] The atrial fibrillation determination unit uses a sufficient number of pulse interval sequences to perform difference sequence determination to determine the presence of atrial fibrillation and small sequence determination to determine the presence of atrial fibrillation, so as to ultimately determine whether atrial fibrillation exists;

[0148] The pressurizing unit is used to control the pressurization of the cuff airbag to pressurize the cuff airbag to a preset pressurization value;

[0149] The decompression unit is used to slowly deflate the cuff airbag during the decompression process, and to maintain the current pressure to continue acquiring the pulse interval sequence or to perform rapid deflation at the end of the measurement;

[0150] The method comprises:

[0151] During the blood pressure reduction process of blood pressure measurement, the pulse sequence corresponding to the target pressure is obtained. When the maximum amplitude appears, if the number of current amplitude sequences is less than the preset threshold, the deflation speed is adjusted and the pulse sequence is continued to be detected according to the new deflation speed;

[0152] After obtaining a sufficient number of amplitude sequences, atrial fibrillation is judged, and a difference sequence of pulse intervals is calculated based on the obtained multiple pulse amplitude sequences to determine whether atrial fibrillation exists, and the difference sequence is divided into multiple small sequences to determine whether atrial fibrillation exists.

[0153] Combine the following Figures 1 to 7 The contents shown illustrate the structure and working principle of the present invention.

[0154] like Figure 1 FIG. 1 shows the appearance of a blood pressure measuring device according to an embodiment of the present invention. The blood pressure measuring device generally comprises a blood pressure measuring cuff wrapped around a measuring part of a subject and a sphygmomanometer body connected to the cuff. The blood pressure measuring device comprises a main control unit, a display unit, a pressurizing unit, a decompressing unit, an atrial fibrillation determining unit, and a pressure pulse detecting unit.

[0155] like Figure 2 As shown, the general composition of the measuring device is shown, including a main control unit, a display unit, a pressurizing unit, a decompression unit, a pressure pulse detection unit and an atrial fibrillation judgment unit. The main control unit is electrically connected to the display unit, the pressure pulse detection unit, the pressurizing unit and the decompression unit. The main control unit controls the pressurizing unit to pressurize to a preset pressure, and then controls the decompression unit to slowly reduce the pressure. During the process of slowly reducing the pressure, the pressure pulse detection unit obtains pulse wave signals corresponding to multiple target pressures. When the pulse sequence has the maximum amplitude, the main control unit determines whether the current number of pulse sequences is less than the preset threshold. If it is less, the deflation speed of the valve is adjusted according to the number of pulse sequences before the maximum amplitude appears, and the pulse sequence is continuously detected according to the new deflation speed. When a sufficient number of pulse sequences are detected, the atrial fibrillation detection unit determines whether atrial fibrillation exists in combination with the characteristics of the pulse sequence.

[0156] The pressurizing unit is used to control the pressurization of the cuff airbag. By cooperating with the pressure pulse detection unit, the cuff airbag is pressurized to a preset pressure.

[0157] The pressure pulse detection unit is used to detect the pressure in the cuff airbag during the pressurization and decompression processes, and simultaneously obtain the pulse wave signals corresponding to multiple target pressures, and transmit them to the main control unit for calculation and processing.

[0158] The decompression unit is used to slowly deflate the cuff airbag during the blood pressure measurement with decompression, and determine whether to adjust the valve deflation speed when the maximum amplitude appears, and perform rapid deflation at the end of the measurement;

[0159] The display unit is used to display the blood pressure result calculated by the main control unit and the status information of the measurement process.

[0160] Next, the working principle of the solution of the present invention will be described:

[0161] During the slow deflation process of each blood pressure measurement by the main control unit, it first determines whether the maximum amplitude appears. When the maximum amplitude appears, it determines whether the number of pulse sequences before the appearance of the maximum amplitude is less than a preset threshold. If it is less, it adjusts the deflation speed of the valve according to the number of pulse sequences before the appearance of the maximum amplitude, and continues to detect the pulse sequences according to the new deflation speed.

[0162] For people with a relatively low pulse rate, when the maximum amplitude appears, the number of pulses is often small (i.e., k < Nt). At this time, by adjusting the deflation speed of the valve, enough pulse sequences can be obtained before the end of the measurement, without the need to obtain enough pulse sequences through multiple pressurizations or multiple measurements, which can save the measurement time.

[0163] During the slow deflation process of blood pressure measurement, a search for the maximum amplitude of the stored pulse sequences Ai is performed. i is a positive integer from 1 to k, representing the position of the pulse sequence on the time axis. The maximum amplitude is denoted as Amax, and max represents the position of the maximum amplitude. If the number of amplitudes Ai < Amax * R after the maximum amplitude is greater than or equal to Nr (R ranges from 0.4 to 1.0, Nr ≥ 1), as shown in the following figure, it means the maximum amplitude appears. If the maximum amplitude appears, it determines whether the number k of the amplitude sequence is less than the threshold Nt, and adjusts the deflation speed of the valve to V1. V1 has a linear relationship with the original deflation speed V, and can be specifically expressed as: V1 = B * k / Nt * V, where B is an adjustment coefficient (B is a number greater than 0). Figure 3 The flowchart showing the adjustment of the valve deflation speed is shown.

[0164] For the determination of the appearance of the maximum amplitude, reference can be made to Figure 7 As shown, the maximum amplitude A22 = 100, R is taken as 0.8, and Nr is taken as 2;

[0165] Sequence: A22(Amax) = 100, A23 = 95, A24 = 75, A25 = 60, A26 = 45, A27 = 30;

[0166] Ai < Amax * R, that is, Ai < 100 * 0.8;

[0167] A24 < 80, A25 < 80, that is, Ai < Amax * R appears twice consecutively, and the maximum amplitude is considered to occur at A25.

[0168] After the measurement is completed, further calculations are performed based on the pulse amplitude sequence Ai. i is a positive integer from 1 to n, representing the position of the waveform sequence on the time axis. Calculate the pulse interval sequence ΔAi = (Ai + 1) - (Ai) from 1 to n - 1, and calculate the average value Sa of the ΔAi sequence. Take Sk1 = k1 * Sa (Sk1 is the judgment threshold for the selected lower interval limit, k1 takes 0.5 - 0.9), take Sk2 = k2 * Sa (Sk2 is the judgment threshold for the selected upper interval limit, k2 takes 1.1 - 1.5), judge the upper and lower limits of the elements in the pulse interval sequence ΔAi, and record the number N of elements exceeding the upper and lower limit thresholds. If N ≥ Nk (Nk is the threshold for the number of irregular pulses, and the value range is Nk ≥ 2), it indicates that atrial fibrillation may occur. Figure 4 The flowchart of pulse waveform detection and judgment is shown.

[0169] Further calculate the pulse interval difference sequence Ri = (ΔAi + 1) - (ΔAi), and calculate the average interval change amount through the Ri sequence (n is the number of elements in the Ri sequence), calculate the average interval amount through the ΔAi sequence The average change amount of the pulse sequence ΔS = St / Sr, the overall change amount of the pulse sequence Take the threshold ΔSk of the average change amount of the pulse sequence and the threshold ΔDk of the overall change amount of the pulse sequence (both ΔSk and ΔDk take numbers greater than 0). If both ΔS > ΔSk and ΔD > ΔDk are satisfied simultaneously, it indicates the existence of atrial fibrillation. Figure 5 The flowchart for judging the existence of atrial fibrillation is shown. Figure 7 The description of the characteristic points in the measurement process is shown.

[0170] The difference sequence of the pulse signal is evenly divided into m small sequences, and the average pulse change rate ΔSj and the overall pulse change amount ΔDj of each small sequence are calculated respectively (the value of j ranges from 1 to m). If the small sequence satisfies both ΔSj > ΔSk and ΔDj > ΔDk simultaneously, the result is recorded as 1, otherwise it is recorded as 0. If the sum of the results of all sequences is greater than C (C takes values from 1 to m), it is judged that atrial fibrillation exists. Figure 6 The flowchart for judging the existence of atrial fibrillation in small sequences is shown.

[0171] Through the implementation of the above embodiments, through the application of the above dynamic deflation-based blood pressure measurement atrial fibrillation detection method and device, it is possible to obtain sufficient amplitude sequence data during the decompression process of a single blood pressure measurement to determine whether atrial fibrillation exists. This method is particularly suitable for people with a smaller pulse rate, so that even if the number of pulses that meet the requirements for atrial fibrillation determination is small, it is possible to obtain an amplitude sequence sufficient for atrial fibrillation during a single blood pressure measurement, which greatly improves the user experience of the relevant applicable population and achieves the purpose of the present invention.

[0172] The above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting atrial fibrillation in blood pressure measurement based on dynamic deflation, used to determine whether atrial fibrillation exists during blood pressure measurement, characterized in that: The method includes: During the blood pressure measurement's blood pressure reduction process, obtain the pulse sequence corresponding to the target pressure. When the maximum amplitude appears and the number of the current amplitude sequences is less than the preset threshold, adjust the deflation speed and continue to detect the pulse sequence according to the new deflation speed; After obtaining a sufficient number of amplitude sequences, perform atrial fibrillation judgment. Calculate the difference sequence of the pulse intervals based on the obtained multiple pulse amplitude sequences to determine whether there is atrial fibrillation, and after dividing the difference sequence into multiple small sequences, determine whether there is atrial fibrillation.

2. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 1, characterized in that: During the blood pressure measurement's blood pressure reduction process, the original deflation speed and the adjusted deflation speed are in a linear relationship to ensure the smoothness of the blood pressure reduction process after adjusting the deflation speed.

3. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 1, characterized in that: Adjust the deflation speed of the valve according to the number of the pulse sequences before the maximum amplitude appears.

4. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 1, characterized in that: For the confirmation of the maximum amplitude, the following method is adopted: During the slow deflation process of blood pressure measurement, search for the maximum amplitude of the obtained pulse sequence Ai, where i is a positive integer from 1 to n, representing the position of the pulse sequence on the time axis, and the maximum amplitude is denoted as Amax. Set the maximum amplitude judgment adjustment coefficient R and the maximum amplitude judgment times threshold Nr. If the number of amplitudes Ai < Amax * R after the maximum amplitude is greater than or equal to Nr, it indicates that the maximum amplitude appears.

5. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 4, characterized in that: Set the preset threshold Nt, and the preset threshold Nt is the minimum sequence threshold for atrial fibrillation judgment. If the maximum amplitude appears, judge whether the number k of the amplitude sequences is less than the preset threshold Nt, and adjust the deflation speed of the valve to V1. V1 and the original deflation speed V are in a linear relationship, expressed as: V1 = B * k / Nt * V, where B is the speed adjustment coefficient and B takes a number greater than zero.

6. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 1, characterized in that: In the step of calculating the difference sequence of the pulse intervals based on the obtained multiple pulse amplitude sequences to determine whether there is atrial fibrillation, the following steps are included: Calculate the difference sequence of the pulse intervals; Calculate the average interval change amount and the average interval amount of the pulse interval sequence; Calculate the average change amount of the pulse interval sequence and the overall change amount of the pulse interval sequence; The set pulse change thresholds include an average threshold and an overall threshold. Judge whether it satisfies that the average change amount of the pulse interval sequence is greater than the average threshold and the overall change amount of the pulse interval sequence is greater than the overall threshold; If not, judge that atrial fibrillation does not exist. If so, judge that atrial fibrillation exists and perform the step of dividing the difference sequence into multiple small sequences and then determining whether there is atrial fibrillation.

7. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 6, characterized in that: In the step of calculating the difference sequence of the pulse intervals based on the obtained multiple pulse amplitude sequences to determine whether there is atrial fibrillation, the following steps are included: Calculate the difference sequence of the pulse intervals Ri, where Ri = (ΔAi + 1) - (ΔAi); The average interval change St is calculated by the pulse interval difference sequence Ri, Where n is the number of pulse interval difference sequences Ri; the average interval amount Sr is calculated by the pulse interval difference sequence Ri, Calculate the average change of the pulse interval sequence ΔS, ΔS = St / Sr; calculate the overall change of the pulse interval sequence ΔD, The set pulse change thresholds include an average threshold ΔSk and an overall threshold ΔDk. Judge whether it satisfies that the average change amount ΔS is greater than the average threshold ΔSk and the overall change amount ΔD is greater than the overall threshold ΔDk, where both ΔSk and ΔDk take numbers greater than 0; If ΔS>ΔSk and ΔD>ΔDk cannot be satisfied simultaneously, it is judged that atrial fibrillation does not exist. If ΔS>ΔSk and ΔD>ΔDk are satisfied simultaneously, it is judged that atrial fibrillation exists and the difference sequence is distributed into multiple small sequences to determine whether atrial fibrillation exists.

8. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 6, characterized in that: The step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences includes the following steps: Evenly distribute the pulse interval difference sequence into multiple small sequences; Calculate the average change of each small sequence and the overall change of each small sequence respectively; Determine whether the average change of the small sequence is greater than the average threshold and the overall change of the small sequence is greater than the overall threshold; If both the average change of the small sequence is greater than the average threshold and the overall change of the small sequence is greater than the overall threshold, the sequence result of the small sequence is counted; if not, it is not counted; Calculate sequence results and values; Determine whether the sequence result and value are greater than the result setting value; If the sum of the sequence results is greater than the result setting value, it is determined that atrial fibrillation exists; if the sum of the sequence results is less than the result setting value, atrial fibrillation does not exist.

9. The method for detecting atrial fibrillation by blood pressure measurement based on dynamic deflation according to claim 8, characterized in that: The step of determining whether atrial fibrillation exists after allocating the difference sequence into a plurality of small sequences includes the following steps: The pulse interval difference sequence is evenly divided into m small sequences; Calculate the average change ΔSj of each small sequence and the overall change ΔDj of each small sequence respectively, where j ranges from 1 to m; Determine whether the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk; If the average change ΔSj of the small sequence is greater than the average threshold ΔSk and the overall change ΔDj of the small sequence is greater than the overall threshold ΔDk, the sequence result of the small sequence is counted as 1, otherwise, it is not counted; Calculate sequence results and values; Determine whether the sequence result and value are greater than the result setting value C, where C ranges from 1 to m; If the sum of the sequence results is greater than the result setting value, it is determined that atrial fibrillation exists; if the sum of the sequence results is less than the result setting value, atrial fibrillation does not exist.

10. A blood pressure measuring device, characterized in that: The device includes a main control unit, a display unit, a pressurizing unit, a decompressing unit, a pressure pulse detection unit and an atrial fibrillation determination unit; wherein, The pressure pulse detection unit is used to obtain the pulse sequence corresponding to the target pressure and transmit it to the main control unit for calculation and processing; The main control unit is electrically connected to the display unit, the pressure pulse detection unit, the atrial fibrillation determination unit, the pressurization unit and the decompression unit. The main control unit controls the pressurization unit to pressurize to a preset target pressure, and then controls the decompression unit to slowly reduce the pressure. In a single decompression process of slowly reducing the pressure, a sufficient number of pulse interval sequences are obtained, and when the maximum amplitude appears, if the current number of amplitude sequences is less than a preset threshold, the main control unit controls the decompression unit to adjust the deflation speed, and continues to detect the pulse sequence according to the new deflation speed; The atrial fibrillation determination unit determines atrial fibrillation after acquiring a sufficient number of amplitude sequences, so as to finally determine whether atrial fibrillation exists; The pressurizing unit is used to control the cuff airbag pressurization to pressurize the cuff airbag to a target pressure; The decompression unit is used to slowly deflate the cuff airbag during the decompression process, and to adjust the deflation speed under the control of the main control unit; The display unit is used to display the blood pressure result calculated by the main control unit, the atrial fibrillation result determined by the atrial fibrillation determination unit, and the status information of the measurement process.

11. A readable storage medium, characterized in that: The readable storage medium stores a control program, and when the control program is executed by the main control unit, the main control unit executes the steps of the method according to any one of claims 1 to 9.

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