Sphygmomanometer fixed through magneto-rheology and blood pressure measuring method of sphygmomanometer

Abstract

The invention discloses a sphygmomanometer fixed through magneto-rheological, and relates to the technical field of blood pressure measurement, the sphygmomanometer is designed through the magneto-rheological technology, the pressure applied to an arm by a sphygmomanometer fixing ring is adjusted by controlling magneto-rheological fluid, and related information such as blood pressure is obtained according to pressure data of the sphygmomanometer fixing ring. The invention further discloses a method for measuring blood pressure through the magneto-rheological fixed sphygmomanometer, according to the method, the magneto-rheological fixed sphygmomanometer is used for measuring the blood pressure, pressure change is achieved by controlling flowing of the magneto-rheological fluid, and then good blood pressure measurement is achieved. According to the invention, the traditional thinking is changed, and another technical scheme except binding type fixation and air pressure fixation is provided; the electromagnetic coil is adopted to control the flow direction of the magnetic fluid to achieve fixation and pressure adjustment, the response speed is high, noise is small, the influence of temperature and the like is small, and part of defects of an existing sphygmomanometer achieving fixation and pressure adjustment by inflating a cuff are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of blood pressure measurement, and in particular to a sphygmomanometer fixed by magnetorheological fluid and a method for measuring blood pressure thereof. Background Art

[0002] Currently, most blood pressure monitors are fixed by binding straps or by inflation, and each of these two methods has its own characteristics.

[0003] The bandage fixing method is more common. By adjusting the tightness of the bandage, it can better fit the measuring parts such as the arms or wrists of different people to ensure the accuracy of the measurement. At the same time, this method is relatively simple to operate, and users can easily master the correct bandage method. However, if the bandage is fixed too loosely, there may be a gap between the cuff and the arm when measuring blood pressure. During the inflation process, more gas needs to be filled, which will cause the measured blood pressure value to be higher, thereby affecting the accuracy of the measurement. If the bandage is too tight, the cuff will put too much pressure on the arm, causing the blood vessels to be in a certain state of pressure when not inflated, which may cause the measured blood pressure value to be lower. In addition, the quality and durability of the bandage may affect its fixing effect, and long-term use may cause wear or loosening. In addition, the accuracy of blood pressure measurement will also be affected by different bandage strength and methods.

[0004] For example, the patent application number is 202321641643.5, and the invention name is a utility model patent for a blood pressure measuring cuff. It provides a blood pressure measuring cuff, including a cuff body, the cuff body having an upper surface and a lower surface arranged relatively, an air bag with adjustable air pressure and an air inlet pipe connected to the air bag are arranged between the upper surface and the lower surface of the cuff body; the upper surface of the cuff body is provided with an adjustable tightness structure, the adjustable tightness structure is adjacent to one side of the air bag, and the adjustable tightness structure is used to block the contact between the limbs and the cuff body when the cuff body is tied, thereby reserving a suitable gap. By arranging the adjustable tightness structure on one side of the air bag, when the cuff body is tied, the limbs are blocked from contacting the cuff body through the adjustable tightness structure, and a one-finger interval between the cuff body and the limbs can be naturally formed, effectively controlling the tightness of the cuff body, making the cuff body more standardized and the measurement results more accurate. However, it is a typical method of fixing the sphygmomanometer with a binding belt, which has the above-mentioned defects: the accuracy of blood pressure measurement will be affected due to different binding strengths and methods.

[0005] The inflation method is to inflate the cuff so that the cuff fits tightly to the measuring part, thereby achieving the purpose of fixing and measuring blood pressure. The advantage of this method is that it can automatically adjust the pressure to ensure the stability of the measurement. However, when the inflation method is used for fixation, if the inflation is insufficient, the cuff cannot fit tightly to the measuring part, which will also lead to deviations in the measurement results. This is because when the inflation is insufficient, the contact between the cuff and the skin is insufficient, and the pressure changes in the artery cannot be accurately sensed. Moreover, excessive inflation may cause excessive pressure on the measuring part, causing discomfort to the person being measured, and may also lead to low measurement results. Generally speaking, electronic sphygmomanometers have a preset inflation pressure range. However, for some patients who need to measure blood pressure for a long time, the air pressure will not be adjusted after the one-time inflation and fixation. Moreover, due to factors such as temperature, the air pressure will also change, resulting in failure to achieve the best results. In addition, the inflation fixation method is relatively noisy, and if it is adjusted frequently, it will affect the patient's rest.

[0006] For example, patent application number 202121844783.3, invention name is utility model patent for inflatable cuff structure and inflatable sphygmomanometer, which relates to an inflatable cuff structure and an inflatable sphygmomanometer, the inflatable cuff structure includes an inflatable cuff body and a sleeve rod, the inflatable cuff body forms a concave side portion and a convex side portion between its mounting end and the free end, the concave side portion and the convex side portion are used to make the inflatable cuff structure have a shape of large on the top and small on the bottom when wrapping the upper arm; the inflatable cuff body is provided with a minimum arm circumference fixing portion and a maximum arm circumference fixing portion, and a wrapping area is formed between the minimum arm circumference fixing portion and the maximum arm circumference fixing portion. Such a design, on the one hand, is convenient for fixing the inflatable cuff body by the sleeve rod; on the other hand, it is conducive to providing a certain range of wrapping areas, respecting individual differences, and expanding the scope of the applicable population of the inflatable cuff structure; on the other hand, when wrapping the upper arm of the human body, it has a shape of large on the top and small on the bottom, which is conducive to adapting to the shape of the measured part of the human body or even the animal body, improving the overall fit of the inflatable cuff structure, thereby improving the accuracy of the inflatable cuff structure when applied to blood pressure measurement. However, it has the above-mentioned defects: for some patients, it is necessary to measure blood pressure for a long time, so after one-time inflation and fixation, the air pressure will also change due to factors such as temperature, resulting in failure to achieve the best effect; and the noise is relatively large during the inflation process. If the air pressure is adjusted frequently, it will affect the patient's rest. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a sphygmomanometer and a method for measuring blood pressure other than the binding and pneumatic fixation methods in view of the above-mentioned technical deficiencies, and specifically to provide a sphygmomanometer fixed by magnetorheological fluid and a method for measuring blood pressure thereof.

[0008] A sphygmomanometer fixed by magnetorheological fluid, comprising a fixing ring, a controller, a pressure regulating chamber, and a closed chamber; The pressure regulating chamber includes a magnetorheological fluid boosting chamber and a magnetorheological fluid storage chamber; The fixed ring is an annular columnar structure, a controller is arranged on the outside of the fixed ring, and a magnetorheological fluid storage chamber, a magnetorheological fluid boosting chamber, and a closed chamber are arranged on the inside of the fixed ring in sequence from inside to outside; The closed cavity is a closed elastic cavity, the interior of the closed cavity is filled with gas, and a pressure sensor is arranged inside the closed cavity; The boosting electromagnetic coil and the decompression electromagnetic coil are provided in the magnetorheological fluid storage chamber, the magnetorheological fluid boosting chamber is a flexible chamber, the boosting electromagnetic coil is provided inside the magnetorheological fluid boosting chamber, and the decompression electromagnetic coil is provided inside the magnetorheological fluid storage chamber; The magnetorheological fluid boosting chamber and the magnetorheological fluid storage chamber are interconnected through a liquid seepage hole, the magnetorheological fluid storage chamber stores magnetorheological fluid, and the magnetorheological fluid boosting chamber and the magnetorheological fluid storage chamber are both wrapped by an electromagnetic shielding layer; The boost solenoid coil, the decompression solenoid coil and the pressure sensor are all electrically connected to the controller through wires. The controller is provided with control buttons and a display device. The controller contains a control chip, a power supply and related circuits that cooperate with the control chip.

[0009] Furthermore, the pressure regulating chamber inside the fixed ring also includes at least one group of pressure control sub-assemblies, which are arranged between the pressure regulating chamber and the closed chamber, and each group of pressure control sub-assemblies consists of a magnetorheological fluid secondary pressurization chamber and a magnetorheological fluid secondary storage chamber. In each group of pressure control sub-assemblies, the side close to the pressure regulating chamber is the magnetorheological fluid secondary storage chamber, and the side close to the closed chamber is the magnetorheological fluid secondary pressurization chamber. The secondary storage chamber of the magnetorheological fluid is formed by alternately connecting a plurality of rigid chambers and a plurality of elastic chambers, and the rigid chambers and elastic chambers connected to each other are interconnected; the secondary boosting chamber of the magnetorheological fluid is a flexible chamber, and the secondary boosting chamber of the magnetorheological fluid and the secondary storage chamber of the magnetorheological fluid are interconnected through a liquid seepage hole; A secondary boosting electromagnetic coil is arranged in the secondary boosting chamber of the magnetorheological fluid, and a secondary decompression electromagnetic coil is arranged in the secondary storage chamber of the magnetorheological fluid; the chambers of the secondary boosting chamber of the magnetorheological fluid and the secondary storage chamber of the magnetorheological fluid are both wrapped by an electromagnetic shielding layer; The secondary boost solenoid coil is connected in parallel or in series with the boost solenoid coil, and the secondary decompression solenoid coil is connected in parallel or in series with the decompression solenoid coil.

[0010] Furthermore, the boost solenoid coil, the decompression solenoid coil, the secondary boost solenoid coil, and the secondary decompression solenoid coil are all individually controlled by a controller.

[0011] Furthermore, the controller is connected to the medical device via an external wire.

[0012] Furthermore, the pressure sensor is a digital pressure sensor ASDX001.

[0013] Furthermore, the relevant circuits in the controller that cooperate with the control chip include an amplifier circuit, a second-order active high-pass filter circuit, a low-pass filter circuit, an A / D conversion circuit and a voltage comparator circuit; The output end of the digital pressure sensor ASDX001 is connected to the input end of the amplifier circuit; The output of the amplifier circuit is connected to the input end of the two-stage active high-pass filter circuit and the low-pass filter circuit; The output end of the second-stage active high-pass filter circuit and the output end of the amplifier circuit are respectively connected to the input end of the A / D conversion circuit, and after being converted into digital signals by the A / D conversion circuit, they are connected to the I / O port of the control chip; The output end of the low-pass filter circuit is connected to the input end of the voltage comparator circuit, and is input into the I / O port of the control chip after being processed by the voltage comparator circuit.

[0014] Furthermore, the display device is a DM-162 liquid crystal display module.

[0015] A method for measuring blood pressure by a sphygmomanometer fixed with magnetorheological fluid: The method steps of boosting electromagnetic coil, decompressing electromagnetic coil, boosting electromagnetic coil and decompressing electromagnetic coil include: Step 1: After the arm is put into the closed cavity, the pressure in the closed cavity is checked in real time using the pressure sensor in the closed cavity; the signal obtained by the pressure sensor is amplified by an amplifying power and divided into three signals; one signal is processed by a secondary active high-pass filter circuit, and then A / D conversion is performed, and then the pulse wave signal is obtained after being processed by the controller; the second signal is processed by a low-pass filter circuit, and then processed by a voltage comparator circuit, and then the pulse frequency signal is obtained after being processed by the controller; the third signal is converted by A / D to be the real-time pressure in the closed cavity; Step 2: After the sphygmomanometer fixed by magnetorheological fluid is started by a control button, the controller records the initial pressure in the closed cavity; Step 3: The controller energizes the boost electromagnetic coil and gradually increases the current passing through the boost electromagnetic coil, allowing the magnetorheological fluid to enter the magnetorheological fluid boost chamber from the magnetorheological fluid storage chamber through the liquid seepage hole, so that the volume of the magnetorheological fluid boost chamber gradually increases to apply pressure to the human wrist; at the same time, as the volume of the magnetorheological fluid boost chamber increases and squeezes the closed chamber, the pressure on the pressure sensor in the closed chamber gradually increases; the controller synchronously detects whether the pulse wave changes dramatically, that is, whether the periodic change of the pulse wave disappears instantly; Step 4: If a drastic change in the pulse wave is detected, that is, the periodic change of the pulse wave disappears instantly, the controller gradually reduces the current passing through the boosting electromagnetic coil, energizes the decompression electromagnetic coil, and gradually increases the current passing through the decompression electromagnetic coil, and the currents passing through the boosting electromagnetic coil and the decompression electromagnetic coil are in opposite directions; at this time, the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber through the seepage hole to the magnetorheological fluid storage chamber, the volume of the magnetorheological fluid boosting chamber becomes smaller, and the pressure in the closed chamber and the pressure applied to the human arm gradually decrease; at this time, the controller calculates the systolic pressure and the diastolic pressure by the amplitude coefficient method or the oscillometric method and displays them on the display device; Step 5: The boosting electromagnetic coil stops working, and the decompression electromagnetic coil is energized to the maximum current, so that the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber through the seepage hole to the magnetorheological fluid storage chamber; Step 6: When the pressure in the closed cavity returns to the initial value, all the magnetorheological fluid flows back from the magnetorheological fluid boosting cavity through the seepage hole to the magnetorheological fluid storage cavity, and the measurement is completed.

[0016] Furthermore, in the steps three and four, when the boost solenoid coil and the second coil are energized by the controller, the secondary boost solenoid coil and the secondary decompression solenoid coil are energized at the same time.

[0017] Compared with the prior art, the beneficial effects of the present invention include at least: 1. Changing the traditional thinking, another technical solution besides binding fixation and air pressure fixation was proposed; 2. Overcome the problem that the accuracy of blood pressure measurement may be affected by different binding strength and methods of the binding type fixed sphygmomanometer; 3. The electromagnetic coil is used to control the flow direction of the magnetic fluid to achieve fixation and pressure regulation. It has a fast response speed, low noise, and is less affected by temperature, etc., which overcomes some of the defects of existing sphygmomanometers that achieve fixation and pressure regulation by inflating the cuff. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A top view of a sphygmomanometer fixed by magnetorheological fluid.

[0019] Figure 2 A top view of another arrangement of a sphygmomanometer fixed by magnetorheological fluid.

[0020] Figure 3 A three-dimensional diagram of a sphygmomanometer fixed by magnetorheological fluid.

[0021] Figure 4 A cross-sectional view of a sphygmomanometer fixed by magnetorheological fluid.

[0022] Figure 5 for Figure 4 A partial enlarged view of point A in the figure.

[0023] Figure 6 The present invention is a structural diagram of a magnetorheological fluid storage chamber in a sphygmomanometer fixed by magnetorheology.

[0024] Figure 7 The present invention is a structural diagram of a secondary storage chamber for magnetorheological fluid in a sphygmomanometer fixed by magnetorheology.

[0025] Figure 8 This is a flow chart of signal processing collected by the pressure sensor in the present invention.

[0026] Fig. 9 This is a circuit diagram for processing signals collected by the pressure sensor in the present invention.

[0027] Fig.10 A flow chart of a method for measuring blood pressure using a magnetorheologically fixed sphygmomanometer.

[0028] Fig.11 This is a control relationship diagram between the controller chip and various electronic components in the present invention.

[0029] Fig.12 This is the circuit diagram of the pressure sensor in the present invention.

[0030] Fig.13 The figure is a circuit diagram of the connection between the display device and the single-chip microcomputer in the present invention.

[0031] Fig.14 This is a circuit diagram of a voltage comparator in the present invention.

[0032] Fig.15 It is the control circuit of the electromagnetic coil in the present invention.

[0033] In the figure, the various reference numerals are represented in sequence as follows: 1. fixed ring; 2. controller; 3. external wire; 4. pressure regulating chamber; 5. closed chamber; 6. secondary boosting chamber for magnetorheological fluid; 7. secondary storage chamber for magnetorheological fluid; 8. boosting chamber for magnetorheological fluid; 9. storage chamber for magnetorheological fluid; 10. seepage hole; 11. elastic chamber. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0035] Embodiment 1: This embodiment mainly describes the basic structure of a sphygmomanometer fixed by magnetorheological fluid. That is to say, this embodiment will fully describe the relevant structures of a sphygmomanometer fixed by magnetorheological fluid, which constitute a protected object, see the attached Figure 1 To Attachment Figure 6 .

[0036] This embodiment discloses a sphygmomanometer fixed by magnetorheological fluid. It includes a fixing ring 1, a controller 2, a pressure regulating chamber 4, and a sealing chamber 5; The pressure regulating chamber 4 includes a magnetorheological fluid pressurizing chamber 8 and a magnetorheological fluid storage chamber 9; The fixing ring 1 is an annular columnar structure, a controller 2 is arranged on the outside of the fixing ring 1, and a magnetorheological fluid storage chamber 9, a magnetorheological fluid boosting chamber 8, and a closed chamber 5 are arranged on the inside of the fixing ring 1 in order from inside to outside; The closed cavity 5 is a closed elastic cavity, the interior of the closed cavity 5 is filled with gas, and a pressure sensor is arranged inside the closed cavity 5; The magnetorheological fluid storage chamber 9 is a rigid chamber, the magnetorheological fluid boosting chamber 8 is a flexible chamber, the magnetorheological fluid boosting chamber 8 is provided with a boosting electromagnetic coil, and the magnetorheological fluid storage chamber 9 is provided with a decompression electromagnetic coil; The magnetorheological fluid boosting chamber 8 and the magnetorheological fluid storage chamber 9 are interconnected through a liquid seepage hole 10. The magnetorheological fluid storage chamber 9 stores magnetorheological fluid. The magnetorheological fluid boosting chamber 8 and the magnetorheological fluid storage chamber 9 are both wrapped by an electromagnetic shielding layer. The boost solenoid coil, the decompression solenoid coil, and the pressure sensor are all electrically connected to the controller 2 through wires. The controller 2 is provided with control buttons and a display device. The controller 2 contains a control chip, a power supply, and related circuits that cooperate with the control chip. Embodiment 2: This embodiment further optimizes the technical solution based on the embodiment 1, and its purpose is to ensure that the pressure change control is more accurate and rapid. For details, please refer to the attached Figure 1 To Attachment Figure 7 .

[0037] This embodiment discloses a sphygmomanometer fixed by magnetorheological fluid, which is improved as follows based on the first embodiment: The pressure regulating chamber 4 inside the fixed ring 1 also includes at least one group of pressure control sub-assemblies, which are arranged between the pressure regulating chamber 4 and the closed chamber 5. Each group of pressure control sub-assemblies consists of a magnetorheological fluid secondary pressurization chamber 6 and a magnetorheological fluid secondary storage chamber 7. In each group of pressure control sub-assemblies, the side close to the pressure regulating chamber 4 is the magnetorheological fluid secondary storage chamber 7, and the side close to the closed chamber 5 is the magnetorheological fluid secondary pressurization chamber 6. The magnetorheological fluid secondary storage chamber 7 is formed by alternately connecting a plurality of rigid chambers and a plurality of elastic chambers 11, and the interconnected rigid chambers and elastic chambers 11 are connected; the magnetorheological fluid secondary boosting chamber 6 is a flexible chamber, and the magnetorheological fluid secondary boosting chamber 6 and the magnetorheological fluid secondary storage chamber 7 are connected to each other through a liquid seepage hole 10; A secondary boosting electromagnetic coil is arranged in the secondary boosting chamber 6 of the magnetorheological fluid, and a secondary decompression electromagnetic coil is arranged in the secondary storage chamber 7 of the magnetorheological fluid; the chambers of the secondary boosting chamber 6 of the magnetorheological fluid and the secondary storage chamber 7 of the magnetorheological fluid are both wrapped by an electromagnetic shielding layer; The secondary boost solenoid coil is connected in parallel or in series with the boost solenoid coil, and the secondary decompression solenoid coil is connected in parallel or in series with the decompression solenoid coil.

[0038] Embodiment 3: This embodiment further optimizes the technical solution based on Embodiment 1 or Embodiment 2, and its purpose is to ensure that the pressure control is more targeted. Figure 1 To Attachment Figure 7 .

[0039] The specific improvement is that the boost solenoid coil, the decompression solenoid coil, the secondary boost solenoid coil and the secondary decompression solenoid coil are all controlled individually by a controller. The controller controls the conduction, magnitude and current direction of each solenoid coil individually or in combination according to the required pressure.

[0040] Embodiment 4: This embodiment further optimizes the technical solution based on any of the above embodiments, and its purpose is to allow the data measured by a sphygmomanometer fixed by magnetorheological fluid to be shared with other medical devices. Figure 1 To Attachment Figure 7 .

[0041] The specific improvement is that the controller 2 is connected to the medical device via the external wire 3, and then the data is transmitted to the existing medical device.

[0042] Embodiment 5: This embodiment is based on the structure of any of the above embodiments and proposes a method for measuring blood pressure by using a sphygmomanometer fixed by magnetorheological fluid. Figure 1 To Attachment Fig.10 .

[0043] A method for measuring blood pressure using a magnetorheologically fixed sphygmomanometer, comprising: Step 1: After the arm is put into the inner side of the closed cavity 5, the pressure in the closed cavity 5 is checked in real time by using the pressure sensor in the closed cavity 5; the signal obtained by the pressure sensor is amplified by an amplifying power and divided into three signals; one signal is processed by a secondary active high-pass filter circuit, and then processed by A / D conversion, and then processed by the controller 2 to obtain a pulse wave signal; the second signal is processed by a low-pass filter circuit, and then processed by a voltage comparator circuit, and then processed by the controller 2 to obtain a pulse frequency signal; the third signal is converted by A / D to obtain the real-time pressure in the closed cavity 5; Step 2: After the sphygmomanometer fixed by magnetorheological fluid is started by the control button, the controller 2 records the initial pressure in the closed chamber 5; Step 3: The controller 2 energizes the boosting electromagnetic coil and gradually increases the current passing through the boosting electromagnetic coil, so that the magnetorheological fluid enters the magnetorheological fluid boosting chamber 8 from the magnetorheological fluid storage chamber 9 through the liquid seepage hole 10, and the volume of the magnetorheological fluid boosting chamber 8 gradually increases to apply pressure to the wrist of the person; at the same time, since the volume of the magnetorheological fluid boosting chamber 8 increases and squeezes the closed chamber 5, the pressure on the pressure sensor in the closed chamber 5 gradually increases; the controller 2 synchronously detects whether the pulse wave changes dramatically, that is, whether the periodic change of the pulse wave disappears instantly; Step 4: If a drastic change in the pulse wave is detected, that is, the periodic change of the pulse wave disappears instantly, the controller 2 gradually reduces the current passing through the boosting electromagnetic coil, energizes the decompression electromagnetic coil, and gradually increases the current passing through the decompression electromagnetic coil, and the currents passing through the boosting electromagnetic coil and the decompression electromagnetic coil are in opposite directions; at this time, the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber 8 through the liquid seepage hole 10 to the magnetorheological fluid storage chamber 9, the volume of the magnetorheological fluid boosting chamber 8 becomes smaller, and the pressure in the closed chamber 5 and the pressure applied to the human arm gradually decrease; at this time, the controller 2 calculates the systolic pressure and the diastolic pressure by the amplitude coefficient method or the oscillometric method and displays them on the display device; Step 5: The boosting electromagnetic coil stops working, and the decompression electromagnetic coil is energized to the maximum current, so that the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber 8 through the liquid seepage hole 10 to the magnetorheological fluid storage chamber 9; Step 6: When the pressure in the closed chamber 5 returns to the initial value, all the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber 8 through the liquid seepage holes 10 to the magnetorheological fluid storage chamber 9, and the measurement is completed.

[0044] And in the above steps 3 and 4, when the boost solenoid coil and the second coil are energized by the controller 2, the secondary boost solenoid coil and the secondary decompression solenoid coil are energized at the same time.

[0045] Embodiment 6: This embodiment is aimed at any of the above embodiments, and selects a suitable controller 2, control circuit, control chip, etc. to further optimize and explain the present invention. Since the technical problem to be solved by the present invention can be easily achieved by people in the technical field by using single-chip microcomputer and other technologies to reasonably select chips, circuits, etc. in conjunction with the technical solutions of embodiments 1 to 5 disclosed in the present invention, the selection of controller 2, control circuit, control chip, etc. is not limited to that proposed in this embodiment. For ease of understanding, the control relationship between each electronic component and the control chip is as follows: Fig.11 shown.

[0046] In this embodiment: the pressure sensor is a digital pressure sensor ASDX001. Fig. 9 , Attachment Fig.12 and attached Fig.14The output E of the digital pressure sensor ASDX001 is connected to the D of the amplifier circuit; the D of the amplifier circuit is connected to the input of the two-stage active high-pass filter and the low-pass filter. The output A of the two-stage active high-pass filter and the output D of the amplifier circuit are respectively connected to the input of the A / D converter, and are converted into digital signals by the A / D converter and connected to the I / O port of the control chip; the output B of the low-pass filter is connected to the input of the comparator at port 11, and is input to the I / O port of the control chip after being processed by the comparator.

[0047] In this embodiment: the 89C51 minimum single-chip microcomputer system is selected, and the single-chip microcomputer minimum system at least includes the 89C51 single-chip microcomputer, power supply, crystal oscillator and reset circuit. The 89C51 single-chip microcomputer, power supply, crystal oscillator and reset circuit and their connection methods are well known in the art and will not be described here.

[0048] In this embodiment: see attached Fig.13 The display device is a DM-162 liquid crystal display module. The digital signals required by the liquid crystal display module are led out from the P0.0-P0.7 ports of AT89C51 and connected to the D0-D7 ports of DM-162 respectively to complete the data transmission. The control pins RS, PR, and E of the liquid crystal display module are connected to the P3.5, P3.6, and P3.7 ports of 89C51 respectively to realize the control of the liquid crystal display module by the microprocessor.

[0049] The three-way signal is read in by the I / O port of the single-chip microcomputer 89C51. Under the control of the program, the single-chip microcomputer performs read and write control in strict accordance with the working sequence required by the ASDX001 pressure sensor. After reading the signal, the signal is processed according to the method for measuring blood pressure by a sphygmomanometer fixed by magnetorheological fluid disclosed in the fifth embodiment, and then displayed through the DM-162 liquid crystal display module.

[0050] In this embodiment, the boost electromagnetic coil, the decompression electromagnetic coil, the secondary boost electromagnetic coil, and the secondary decompression electromagnetic coil are collectively referred to as electromagnetic coils. When the electromagnetic coils are energized, they generate a magnetic field. The control circuit of the electromagnetic coils is shown in the attached figure. Fig.15 The F and G terminals of the control circuit of each electromagnetic coil are respectively connected to the I / O port of the single-chip microcomputer, and the magnitude and direction of the current entering the electromagnetic coil are controlled by the single-chip microcomputer.

[0051] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

[0052] It should be noted that the control circuits and control programs not disclosed in the present invention can be easily implemented by those skilled in the art according to the disclosure of the present invention. In the implementation process, the undisclosed parts are implemented using existing technologies and will not be described in detail in the implementation content of the present invention.

Claims

1. A sphygmomanometer fixed by magnetorheological fluid, characterized in that: It comprises a fixing ring (1), a controller (2), a pressure regulating chamber (4), and a sealing chamber (5); The pressure regulating chamber (4) comprises a magnetorheological fluid pressurizing chamber (8) and a magnetorheological fluid storage chamber (9); The fixed ring (1) is an annular columnar structure. A controller (2) is arranged on the outside of the fixed ring (1). A magnetorheological fluid storage chamber (9), a magnetorheological fluid boosting chamber (8), and a closed chamber (5) are arranged on the inside of the fixed ring (1) in order from inside to outside. The closed cavity (5) is a closed elastic cavity, the interior of the closed cavity (5) is filled with gas, and a pressure sensor is arranged inside the closed cavity (5); The boosting electromagnetic coil, the decompression electromagnetic coil, the boosting electromagnetic coil, the decompression electromagnetic coil, the magnetorheological fluid storage chamber (9) is a rigid chamber, the magnetorheological fluid boosting chamber (8) is a flexible chamber, the magnetorheological fluid boosting chamber (8) is provided with a boosting electromagnetic coil, and the magnetorheological fluid storage chamber (9) is provided with a decompression electromagnetic coil; The magnetorheological fluid boosting chamber (8) and the magnetorheological fluid storage chamber (9) are interconnected via a liquid seepage hole (10); magnetorheological fluid is stored in the magnetorheological fluid storage chamber (9); and the chamber bodies of the magnetorheological fluid boosting chamber (8) and the magnetorheological fluid storage chamber (9) are both wrapped by an electromagnetic shielding layer; The boost solenoid coil, the decompression solenoid coil, and the pressure sensor are all electrically connected to the controller (2) via wires. The controller (2) is provided with control buttons and a display device. The controller (2) internally contains a control chip, a power supply, and related circuits that cooperate with the control chip to work.

2. A sphygmomanometer fixed by magnetorheological fluid according to claim 1, characterized in that: The pressure regulating chamber (4) inside the fixed ring (1) further comprises at least one group of pressure control sub-assemblies, the pressure control sub-assemblies being arranged between the pressure regulating chamber (4) and the closed chamber (5), each group of pressure control sub-assemblies being composed of a magnetorheological fluid secondary pressurization chamber (6) and a magnetorheological fluid secondary storage chamber (7), the side of each group of pressure control sub-assemblies close to the pressure regulating chamber (4) being the magnetorheological fluid secondary storage chamber (7), and the side close to the closed chamber (5) being the magnetorheological fluid secondary pressurization chamber (6); The magnetorheological fluid secondary storage chamber (7) is formed by alternately connecting a plurality of rigid chambers and a plurality of elastic chambers (11), and the rigid chambers and elastic chambers (11) connected to each other are interconnected; the magnetorheological fluid secondary boosting chamber (6) is a flexible chamber, and the magnetorheological fluid secondary boosting chamber (6) and the magnetorheological fluid secondary storage chamber (7) are interconnected via a liquid seepage hole (10); A secondary boosting electromagnetic coil is arranged in the secondary boosting chamber (6) of the magnetorheological fluid, and a secondary decompression electromagnetic coil is arranged in the secondary storage chamber (7) of the magnetorheological fluid; the chamber bodies of the secondary boosting chamber (6) of the magnetorheological fluid and the secondary storage chamber (7) of the magnetorheological fluid are both wrapped by an electromagnetic shielding layer; The secondary boost solenoid coil is connected in parallel or in series with the boost solenoid coil, and the secondary decompression solenoid coil is connected in parallel or in series with the decompression solenoid coil.

3. A sphygmomanometer fixed by magnetorheological fluid according to claim 2, characterized in that: The boost solenoid coil, the decompression solenoid coil, the secondary boost solenoid coil, and the secondary decompression solenoid coil are all individually controlled by the controller (2).

4. A sphygmomanometer fixed by magnetorheological fluid according to claim 1 or claim 2, characterized in that: The controller (2) is externally connected to the medical device via an external wire (3).

5. A sphygmomanometer fixed by magnetorheological fluid according to claim 1 or claim 2, characterized in that: The pressure sensor is a digital pressure sensor ASDX001.

6. A sphygmomanometer fixed by magnetorheological fluid according to claim 5, characterized in that: The relevant circuits in the controller (2) that cooperate with the control chip include an amplifier circuit, a second-order active high-pass filter circuit, a low-pass filter circuit, an A / D conversion circuit and a voltage comparator circuit; The output end of the digital pressure sensor ASDX001 is connected to the input end of the amplifier circuit; The output of the amplifier circuit is connected to the input end of the two-stage active high-pass filter circuit and the low-pass filter circuit; The output end of the second-stage active high-pass filter circuit and the output end of the amplifier circuit are respectively connected to the input end of the A / D conversion circuit, and after being converted into digital signals by the A / D conversion circuit, they are connected to the I / O port of the control chip; The output end of the low-pass filter circuit is connected to the input end of the voltage comparator circuit, and is input into the I / O port of the control chip after being processed by the voltage comparator circuit.

7. A sphygmomanometer fixed by magnetorheological fluid according to claim 1 or claim 2, characterized in that: The display device is a DM-162 liquid crystal display module.

8. A method for measuring blood pressure by means of a magnetorheologically fixed sphygmomanometer, characterized in that: Measuring blood pressure using a sphygmomanometer fixed by magnetorheological fluid according to any one of claims 1 to 7; The method steps of boosting electromagnetic coil, decompressing electromagnetic coil, boosting electromagnetic coil and decompressing electromagnetic coil include: Step 1: After the arm is placed inside the closed cavity (5), the pressure inside the closed cavity (5) is checked in real time using a pressure sensor inside the closed cavity (5); the signal obtained by the pressure sensor is amplified by an amplifying power and then divided into three signals; one signal is processed by a secondary active high-pass filter circuit, then A / D converted, and then processed by a controller (2) to obtain a pulse wave signal; the second signal is processed by a low-pass filter circuit, then processed by a voltage comparator circuit, and then processed by the controller (2) to obtain a pulse frequency signal; the third signal is converted by A / D to obtain the real-time pressure inside the closed cavity (5); Step 2: After the sphygmomanometer fixed by magnetorheological fluid is activated by a control button, the controller (2) records the initial pressure in the closed chamber (5); Step 3: The controller (2) energizes the boosting electromagnetic coil and gradually increases the current passing through the boosting electromagnetic coil, so that the magnetorheological fluid enters the magnetorheological fluid boosting chamber (8) from the magnetorheological fluid storage chamber (9) through the liquid seepage hole (10), and the volume of the magnetorheological fluid boosting chamber (8) gradually increases to apply pressure to the wrist of the person; at the same time, as the volume of the magnetorheological fluid boosting chamber (8) increases and squeezes the closed chamber (5), the pressure on the pressure sensor in the closed chamber (5) gradually increases; the controller (2) synchronously detects whether the pulse wave changes dramatically, that is, whether the periodic change of the pulse wave disappears instantly; Step 4: If a drastic change in the pulse wave is detected, that is, the periodic change of the pulse wave disappears instantly, the controller (2) gradually reduces the current passing through the boosting electromagnetic coil, energizes the decompression electromagnetic coil, and gradually increases the current passing through the decompression electromagnetic coil, and the currents passing through the boosting electromagnetic coil and the decompression electromagnetic coil are in opposite directions; at this time, the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber (8) through the liquid seepage hole (10) to the magnetorheological fluid storage chamber (9), the volume of the magnetorheological fluid boosting chamber (8) decreases, and the pressure in the closed chamber (5) and the pressure applied to the human arm gradually decrease; at this time, the controller (2) calculates the systolic pressure and the diastolic pressure by the amplitude coefficient method or the oscillometric method and displays them on the display device; Step 5: the boosting electromagnetic coil stops working, and the decompression electromagnetic coil is energized to the maximum current, so that the magnetorheological fluid flows back from the magnetorheological fluid boosting chamber (8) through the liquid seepage hole (10) to the magnetorheological fluid storage chamber (9); Step 6: When the pressure in the closed chamber (5) returns to the initial value, all the magnetorheological fluid flows from the magnetorheological fluid boosting chamber (8) through the liquid seepage hole (10) back to the magnetorheological fluid storage chamber (9), and the measurement is completed.

9. A method for measuring blood pressure by a sphygmomanometer fixed with magnetorheological fluid according to claim 8, characterized in that: In the steps 3 and 4, when the boost solenoid coil and the second coil are energized by the controller (2), the secondary boost solenoid coil and the secondary decompression solenoid coil are energized at the same time.

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