A transcranial magnetic stimulation therapeutic instrument magnetic field detection device and detection method

Abstract

The application discloses a transcranial magnetic stimulation therapeutic instrument magnetic field detection device and a detection method. The detection device comprises a detection water tank, a fixed support unit arranged outside the detection water tank and a measurement unit arranged in the detection water tank. The measurement unit comprises a first driving assembly, a second driving assembly and an axial magnetic sensor array assembly. The first driving assembly is used for adjusting the height of the axial magnetic sensor array assembly. The second driving assembly is used for rotating and driving the axial magnetic sensor array assembly around the central axis of the measured probe. Then, the three-dimensional magnetic field distribution of the measured probe in the detection water tank is obtained through the axial magnetic sensor array assembly. Through the high-precision displacement and positioning of the axial magnetic sensor array assembly in the X, Y and Z directions, the positioning repeatability and accuracy of the measurement probe are effectively improved, so that the accuracy and repeatability of the core parameter measurement of the TMS therapeutic instrument magnetic field are effectively improved.

Description

Technical Field

[0001] This invention relates to a magnetic field detection device and detection method for a transcranial magnetic stimulation therapy instrument, belonging to the field of magnetic field detection technology. Background Technology

[0002] With the rapid development of the medical and health industry, transcranial magnetic stimulation (TMS) therapy devices have become increasingly popular as treatments for mental illnesses. However, TMS technology acts directly on the human brain, and improper TMS treatment can increase the likelihood of adverse reactions and even cause irreversible neurological damage. To ensure patient safety and treatment effectiveness, effective performance testing and quality control are essential for the wide variety of TMS therapy devices available.

[0003] Depending on the design of the stimulation sequence, TMS therapy devices are further divided into single-pulse transcranial magnetic stimulation (TMS) devices, paired-pulse TMS devices, repetitive transcranial stimulation (RTS) devices, and burst-pulse TMS devices. Regardless of the type, all TMS devices are based on Faraday's law of electromagnetic induction and require testing of the generated electromagnetic field to ensure safety and effectiveness.

[0004] According to Faraday's law of electromagnetic induction, the characteristic parameters of the alternating magnetic field generated by a TMS therapy device are mainly determined by the device's own performance, and are only affected by the object's structure and propagation distance during magnetic field transmission. Based on simulations and actual test results of the magnetic field generated by existing TMS therapy devices, core parameters such as magnetic induction intensity decrease exponentially as the distance between the magnetic field measuring probe and the surface of the TMS therapy device's stimulation coil increases. Therefore, accurately controlling the displacement and positioning of the magnetic field intensity measuring probe is of great significance for improving the repeatability and accuracy of the measurement results of the core parameters related to the magnetic field of the TMS therapy device. Summary of the Invention

[0005] Purpose of the invention: To address the problems existing in the prior art, the present invention provides a magnetic field detection device and detection method for a transcranial magnetic stimulation (TMS) therapy device. By achieving high-precision displacement and positioning of the magnetic sensor array assembly in the X, Y, and Z directions, the device effectively improves the positioning repeatability and accuracy of the measurement probe, thereby effectively improving the accuracy and repeatability of the measurement of the core parameters of the magnetic field in the TMS therapy device.

[0006] Technical solution: To achieve the above objectives, the present invention provides a magnetic field detection device for a transcranial magnetic stimulation therapy instrument, comprising a detection water tank, a fixed support unit disposed outside the detection water tank, and a measuring unit disposed inside the detection water tank, wherein the detection water tank is used to contain a simulated medium, and the fixed support unit is used to fix the probe of the transcranial magnetic stimulation therapy instrument to be tested above the detection water tank, and to set its emission surface horizontally downward.

[0007] The measurement unit includes a first driving component, a second driving component, and an axial magnetic sensor array component. The first driving component is used to adjust the height of the axial magnetic sensor array component, and the second driving component is used to drive the axial magnetic sensor array component to rotate around the central axis of the probe under test (which is the central axis of the stimulation coil in this invention). The axial magnetic sensor array component is then used to obtain the three-dimensional magnetic field distribution formed by the probe under test in the detection tank.

[0008] Furthermore, the measuring unit also includes a first measuring component and a second measuring component, wherein the first measuring component is used to measure the height change of the axial magnetic sensor array assembly, and the second measuring component is used to measure the rotation angle of the axial magnetic sensor array assembly.

[0009] Specifically, the second drive assembly includes an annular guide rail and a second drive motor. The annular guide rail coincides with the central axis of the axial magnetic sensor array assembly. One end of the axial magnetic sensor array assembly is slidably engaged with the annular guide rail via a roller assembly. The second drive motor is fixedly connected to the axial magnetic sensor array assembly and is drivenly connected to the roller assembly, thereby realizing the rotational drive of the axial magnetic sensor array assembly along the annular guide rail.

[0010] Specifically, the second measuring component includes a grating ruler arranged along the annular guide rail and a reading head arranged at the other end of the axial magnetic sensor array assembly, thereby obtaining the rotation angle of the axial magnetic sensor array assembly.

[0011] Specifically, the first driving component includes a vertically arranged linear module and a first driving motor. The first driving motor is located on top of the linear module and is driven by the linear module. The output end of the linear module is fixedly connected to a ring guide rail, thereby driving the axial magnetic sensor array component to move up and down through the ring guide rail.

[0012] Specifically, the first measuring component includes a vertically arranged support rod and a distance sensor. A linear bearing is fitted on the support rod, which is fixedly connected to the annular guide rail, thereby maintaining synchronous lifting and lowering movements. The distance sensor is located at the top of the support rod and is used to measure the height change of the annular guide rail, thereby obtaining the height change of the axial magnetic sensor array component.

[0013] Specifically, the fixed support unit includes a clamping device, which includes a movable part and a fixed part. The movable part slides with the fixed part through a slide assembly, thereby achieving the clamping and fixing of the probe under test.

[0014] Specifically, the axial magnetic sensor array assembly includes several magnetic sensors arranged sequentially along the length direction. The magnetic sensors are triaxial Hall magnetic sensors, which can simultaneously measure magnetic field components in three orthogonal directions.

[0015] Furthermore, the magnetic field detection device also includes a control unit and a host computer. The host computer is connected to the first drive component, the second drive component, and the axial magnetic sensor array component via the control unit, thereby realizing drive control and data acquisition.

[0016] Furthermore, the present invention also provides a detection method based on the above-mentioned transcranial magnetic stimulation therapy instrument magnetic field detection device, comprising the following steps:

[0017] Before starting the test, a set volume of simulated medium is injected into the test tank, and the probe to be tested is fixed above the test tank by the fixed support unit, so that its emission surface is set horizontally downward.

[0018] After the test begins, the height of the axial magnetic sensor array assembly is adjusted by the first drive assembly, and the rotation of the axial magnetic sensor array assembly around the central axis of the probe under test is driven by the second drive assembly. Thus, the three-dimensional magnetic field distribution formed by the probe under test in the test tank is obtained through the axial magnetic sensor array assembly.

[0019] Beneficial effects: Based on the magnetic field distribution characteristics of transcranial magnetic stimulation coils, this invention uses an axial magnetic sensor array assembly that is driven to rotate around the central axis of the coil to measure the magnetic field. At the same time, the magnetic field distribution of the coil is also closely related to the axial distance from the coil surface. This invention further obtains a precise and comprehensive three-dimensional magnetic field distribution by controlling the height of the axial magnetic sensor array assembly.

[0020] Meanwhile, by achieving high-precision displacement and positioning of the axial magnetic sensor array assembly in the X, Y, and Z directions, this invention effectively improves the positioning repeatability and accuracy of the measurement probe, thereby significantly enhancing the accuracy and repeatability of the core magnetic field parameter measurements of the TMS therapy device. Furthermore, the invention's structural design of the detection tank effectively simulates the working environment of the transcranial magnetic stimulation therapy device, ensuring the accuracy of the experimental data. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the magnetic field detection device in an embodiment of the present invention;

[0022] Figure 2 This is a schematic cross-sectional view of the detection tank in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the external structure of the detection tank in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the measurement unit in an embodiment of the present invention;

[0025] Figure 5 This is a control principle diagram of the control box in an embodiment of the present invention;

[0026] Figure 6 This is a spatial distribution map of magnetic induction intensity obtained by the host computer simulation in an embodiment of the present invention;

[0027] The diagram includes: 1. Detection tank, 2. Fixed support unit, 3. Measurement unit, 4. Test probe, 5. Control box, 6. Host computer, 11. Top cover, 12. Level, 13. Foot bracket, 22. Flexible clamp, 23. Screw slide, 24. Nut knob, 31. First drive assembly, 32. Second drive assembly, 33. Axial magnetic sensor array assembly, 34. First measurement assembly, 211. Moving part, 212. Fixed part, 311. Servo motor, 312. Motor bracket, 313. Coupling, 314. Screw assembly, 315. Fixed seat, 316. Nut seat, 321. Circular guide rail, 322. Roller assembly, 323. Gear motor, 341. Support rod, 342. Mounting seat, 343. Bearing seat, 344. Laser rangefinder sensor, 351. Grating ruler, 352. Reading head. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments.

[0029] Reference Figure 1 , Figure 2 The present invention provides a magnetic field detection device for a transcranial magnetic stimulation therapy instrument, comprising a detection water tank 1, a fixed support unit 2 disposed on the outside of the detection water tank 1, and a measuring unit 3 disposed inside the detection water tank 1.

[0030] Specifically, the testing tank 1 is used to simulate the working environment of a transcranial magnetic stimulation (TMS) therapy device. Exemplarily, the testing tank 1 is a square tank made of transparent acrylic material, filled with copper sulfate liquid (or other transparent fluid medium) and covered by an acrylic cover 11, thereby simulating the structure of the skull. All internal components are waterproof. Preferably, the bottom of the testing tank 1 is also equipped with four adjustable feet 13. Before the test, the four feet 13 are adjusted by observing the level 12 mounted on the cover 11 to ensure that the testing tank 1 remains level.

[0031] Specifically, the fixing bracket unit 2 is used to fix the probe 4 of the transcranial magnetic stimulation therapy device above the detection water tank 1, and to set its emitting surface horizontally downward, thereby ensuring the accuracy of the test data. Further, the fixing bracket unit 2 includes a clamping device arranged along one side of the detection water tank 1. The clamping device includes a movable part 211 and a fixed part 212, wherein the movable part 211 slides with the fixed part 212 through a slide assembly, thereby achieving the clamping and fixing of the probe 4. For example, refer to... Figure 3 Flexible clamps 22 can be provided on the movable part 211 and the fixed part 212 to accommodate transcranial magnetic stimulation probes of different sizes; the slide assembly can be a lead screw slide 23, and the movable part 211 can be driven to slide along the lead screw slide 23 by the nut knob 24 on one side.

[0032] Furthermore, to ensure that the rotation center of the axial magnetic sensor array assembly 33 coincides with the central axis of the probe under test 4, the clamping device can be adjusted along the side of the detection tank 1. The simplest way is to manually adjust the position of the clamping device on the side of the detection tank 1 (preferably, it should be adjusted close to the side of the detection tank 1 to prevent offset) and the distance of the probe under test 4 extending out of the clamping device. Of course, during this adjustment process, the emitting surface of the probe under test 4 should always be kept horizontally downward. In addition, other methods can be used to clamp and fix the probe under test 4, such as clamping devices with two semi-circular clamps hinged together, or other methods can be used to adjust the movement of the clamping device, such as displacement structures like linear slides.

[0033] Specifically, the measurement unit 3 includes a first driving component 31, a second driving component 32, and an axial magnetic sensor array component 33. The first driving component 31 is used to adjust the height of the axial magnetic sensor array component 33, and the second driving component 32 is used to drive the axial magnetic sensor array component 33 to rotate around the central axis of the probe 4 under test, thereby obtaining the three-dimensional magnetic field distribution formed by the probe 4 under test in the detection tank 1. Further, the measurement unit 3 also includes a first measurement component 34 and a second measurement component. The first measurement component 34 is used to measure the height change of the axial magnetic sensor array component 33, and the second measurement component is used to measure the rotation angle of the axial magnetic sensor array component 33.

[0034] For example, refer to Figure 4The first drive assembly 31 includes a lead screw assembly 314 and a servo motor 311. The lead screw assembly 314 is vertically fixed in the detection water tank 1 by a fixing seat 315. The servo motor 311 is mounted on the top of the lead screw assembly 314 by a motor bracket 312 and is drivenly connected to the lead screw assembly 314 by a coupling 313. The lead screw nut on the lead screw assembly 314 is rigidly connected to the annular guide rail 321 by a nut seat 316, thereby driving the axial magnetic sensor array assembly 33 to move up and down through the annular guide rail 321. Accordingly, the first measuring component 34 includes a support rod 341 and a laser rangefinder sensor 344. The support rod 341 is also vertically fixed in the detection tank 1 via a mounting base 342. A linear bearing is fitted on the support rod 341, which is rigidly connected to the annular guide rail 321 via a bearing seat 343, thereby maintaining synchronous lifting and lowering movements. The laser rangefinder sensor 344 is mounted on the mounting base 342 at the top of the support rod 341, with its detection surface pointing vertically downwards, thereby measuring the distance change between itself and the annular guide rail 321 in real time, and then calculating the height change of the axial magnetic sensor array component 33. Preferably, the first measuring component 34 and the first driving component 31 are arranged opposite each other in the detection tank 1 (preferably arranged along the side center axis), thereby improving the lifting and lowering stability of the annular guide rail 321. In this embodiment, the first measuring component 34 and the fixed support unit 2 are arranged on the same side in the detection tank 1, without interfering with each other.

[0035] Continue to refer to Figure 4 The second driving component 32 includes an annular guide rail 321 and a miniature waterproof geared motor 323. The annular guide rail 321 coincides with the central axis of the axial magnetic sensor array component 33. One end of the axial magnetic sensor array component 33 is slidably engaged with the annular guide rail 321 via a roller assembly 322. The geared motor 323 is rigidly connected to the axial magnetic sensor array component 33 via a fixed bracket. Simultaneously, the rotation shaft of the geared motor 323 is driven by the roller assembly 322 via a coupling 313, thereby realizing the rotational drive of the axial magnetic sensor array component 33 along the annular guide rail 321. Correspondingly, the second measuring component includes an absolute grating ruler 351 (0° to 360°) disposed at the bottom of the annular guide rail 321 and a reading head 352 rigidly connected to the other end of the axial magnetic sensor array component 33. The probe of the reading head 352 faces the grating ruler 351. When the axial magnetic sensor array component 33 follows the roller assembly 322 along the annular guide rail 321, the reading head 352 moves synchronously and records the angle of travel.

[0036] Specifically, the axial magnetic sensor array assembly 33 includes multiple magnetic sensors arranged along the length direction. These magnetic sensors are preferably MV2 digital triaxial Hall magnetic sensors, which incorporate three orthogonal Hall sensors to simultaneously measure magnetic field components (Bx, By, Bz) in three orthogonal directions. For example, the axial magnetic sensor array assembly 33 includes 16 MV2 magnetic sensors arranged along the length direction, thereby acquiring 16 sets of three-dimensional magnetic induction data. Of course, to effectively cover the magnetic field distribution range of the stimulation coil, the distribution distance of the magnetic sensors is not less than the average head circumference of the human body, which is the effective range of the stimulation coil, and the magnetic sensors are preferably evenly distributed within this length range.

[0037] Furthermore, to ensure that the probe 4 under test coincides as closely as possible with the central axis of the annular guide rail 321, a reference line aligned with the central axis of the annular guide rail 321 can be set around the detection tank 1. Alternatively, other positioning methods can be used for probe positioning, such as a laser positioner positioned above the detection tank 1. In addition, to ensure that the liquid level of the medium injected into the detection tank 1 reaches a set height h, a water level scale can be set on one side of the detection tank 1 to observe the liquid level. Here, the liquid level height h needs to be greater than the maximum height of the axial magnetic sensor array assembly 33 to ensure complete coverage of the measuring probe.

[0038] Furthermore, the magnetic field detection device also includes a control box 5 and a host computer 6. The control box 5 is electrically connected to the measurement unit 3 and the host computer 6, respectively, and is used to receive working instructions from the host computer 6, control the operation of each component of the measurement unit 3, and upload the collected measurement data to the host computer 6. The host computer 6 mainly includes a computer, which is used to control the control box 5 and receive measurement data, display and store the three-dimensional magnetic induction intensity values, and simulate the magnetic field distribution in the data space, so as to facilitate the operator to study the magnetic field distribution of the transcranial magnetic stimulation therapy device. For example, the control box 5 includes a microprocessor and its peripheral circuits. On the one hand, it is used to collect measurement data from the axial magnetic sensor array assembly 33, the laser rangefinder 344, and the reading head 352. On the other hand, it is used to realize the drive control of the servo motor 311 and the geared motor 323, and then receive and upload data to the host computer 6 through the serial communication interface.

[0039] Reference Figure 5 The present invention also includes a detection method based on the magnetic field detection device of the above-mentioned transcranial magnetic stimulation therapy instrument. This method includes the following steps:

[0040] S1. Adjust the foot bracket 13 at the bottom of the test tank 1 and observe the level 12 on its upper cover 11 to ensure that the test tank 1 remains level during the test.

[0041] S2. Inject copper sulfate liquid into the test tank 1 to reach a set height h, and cover the test tank 1 with an acrylic cover 11 to simulate the structure of a skull.

[0042] S3. Fix the probe 4 to be tested above the test tank 1 using the clamping device, place it flat against the tank cover 11, and ensure that the magnetic field emitting surface faces downward.

[0043] S4. Manually adjust the position of the clamping device on the side of the test tank 1 and the distance of the probe 4 to be tested extending out of the clamping device, thereby ensuring that the central axis of the probe 4 to be tested is aligned with the reference line around the test tank 1.

[0044] S5. Connect the host computer 6 to the control box 5 to complete the initial serial communication settings.

[0045] S6. Initialize the servo motor 311 and the geared motor 323 through the host computer 6, that is, control the ring guide rail 321 to return to the bottom (the minimum limit value of vertical displacement), and control the roller assembly 322 to move to the 0° position of the absolute grating ruler 351.

[0046] S7. Set parameters via host computer 6: set maximum lifting height to 10cm, step value to 0.5cm, and rotation step angle to 2.0°.

[0047] S8. Start the probe under test 4, set the stimulation sequence, and begin the test:

[0048] The servo motor 311 is controlled by the control box 5 to drive the ring guide rail 321 to rise evenly in a step of 0.5cm each time until the maximum rising height of 10cm is reached and then it stops.

[0049] After each ascent, the control box 5 controls the geared motor 323 to rotate, which in turn drives the axial magnetic sensor array assembly 33 to rotate in 2.0° increments until it stops after rotating 180°. During the drive process, the rotation angle is determined based on the data collected by the reading head 352.

[0050] Every 2.0° of rotation, the axial magnetic sensor array assembly 33 collects three-dimensional magnetic induction intensity data once and uploads it to the host computer 6;

[0051] S9. After completing the entire experiment, the host computer 6 collected a total of 16×90×20=28800 sets of magnetic induction intensity data. Each set of magnetic induction intensity data includes magnetic induction intensity values ​​in three axes. By establishing the relationship between magnetic induction intensity data values ​​and depth, the spatial field strength distribution of the transcranial magnetic stimulation therapy device under test can be simulated.

[0052] During the test, while the control box 5 collects magnetic induction intensity data each time, it further measures the distance 'a' between the laser rangefinder 344 and the annular guide rail 321. Adding this to the fixed height 'b' from the upper edge of the water tank cover 11 to the lower edge of the laser rangefinder 344 in the mechanical structure design, the measurement depth 'a+b' (i.e., the axial distance from the probe surface) corresponding to the magnetic induction intensity value can be obtained. This facilitates the establishment of a spatial distribution map and can also be used for data traceability and comparison. Of course, to improve data accuracy, the height difference between the axial magnetic sensor array assembly 33 and the annular guide rail 321 can also be considered, which is also a fixed value in the mechanical structure design.

[0053] The host computer in this invention can achieve the "free space acquisition" acquisition mode by determining the minimum limit and absolute zero point. In this mode, the servo motor movement position can be automatically calculated and the three-dimensional magnetic induction intensity value corresponding to the displacement value of the probe under test of the TMS therapeutic instrument in various directions can be displayed, thereby realizing safe, efficient, accurate and automatic displacement and positioning of the magnetic field measurement probe.

[0054] Reference Figure 6 The spatial distribution of the magnetic induction intensity can be further simulated using a host computer. Here, a figure-eight coil is used as the test object. The electric field generated by the figure-eight coil has two types of peaks: a main peak located at the junction of the two coils and side peaks located on both sides. The amplitude of the main peak is about twice that of the side peaks. This characteristic makes the focusing ability of the figure-eight coil far superior to that of a circular coil. Therefore, the figure-eight coil has been more widely used in experiments and clinical practice.

[0055] Currently, commonly used transcranial magnetic stimulation (TMS) coils include circular coils, figure-eight coils, and H-shaped coils, etc., and the magnetic field generated by these coils is often symmetrically distributed around the central axis of the coil. Based on this magnetic field distribution characteristic, this invention uses an axial magnetic sensor array assembly driven by rotation around the central axis of the coil to measure the magnetic field. Furthermore, the magnetic field distribution of the coil is also closely related to the axial distance from the coil surface; therefore, this invention further obtains a precise and comprehensive three-dimensional magnetic field distribution by controlling the height of the axial magnetic sensor array assembly. In addition, this invention uses a detection water tank filled with simulated medium and covered with a top cover to simulate the structure of the skull, thereby fully simulating the working environment of the TMS therapy device and ensuring the accuracy of the experimental data.

[0056] The above-described specific embodiments are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Various modifications, substitutions, and improvements made by those skilled in the art to the technical solutions of the present invention based on the provided textual description and drawings, without departing from the design concept and spirit of the present invention, should all fall within the scope of protection of the present invention.

Claims

1. A magnetic field detection device for a transcranial magnetic stimulation therapy instrument, characterized in that, The device includes a detection tank, a fixed support unit disposed outside the detection tank, and a measuring unit disposed inside the detection tank. The detection tank is used to contain a simulated medium, and the fixed support unit is used to fix the probe of the transcranial magnetic stimulation therapy device above the detection tank and to set its emission surface horizontally downward. The measurement unit includes a first driving component, a second driving component, and an axial magnetic sensor array component. The first driving component is used to adjust the height of the axial magnetic sensor array component, and the second driving component is used to drive the rotation of the axial magnetic sensor array component around the central axis of the probe under test. The axial magnetic sensor array component is then used to obtain the three-dimensional magnetic field distribution formed by the probe under test in the detection tank. The measuring unit further includes a first measuring component and a second measuring component, wherein the first measuring component is used to measure the height change of the axial magnetic sensor array assembly, and the second measuring component is used to measure the rotation angle of the axial magnetic sensor array assembly. The axial magnetic sensor array assembly includes multiple magnetic sensors arranged along the length direction. The magnetic sensors are triaxial Hall magnetic sensors that can simultaneously measure magnetic field components in three orthogonal directions. The distribution range of the magnetic sensors is not less than the average value of the human head circumference, and the magnetic sensors are evenly distributed within this distribution range.

2. The magnetic field detection device for transcranial magnetic stimulation therapy according to claim 1, characterized in that, The second drive assembly includes an annular guide rail and a second drive motor. The annular guide rail coincides with the central axis of the axial magnetic sensor array assembly. One end of the axial magnetic sensor array assembly is slidably engaged with the annular guide rail via a roller assembly. The second drive motor is fixedly connected to the axial magnetic sensor array assembly and is drivenly connected to the roller assembly, thereby realizing the rotational drive of the axial magnetic sensor array assembly along the annular guide rail.

3. The magnetic field detection device for transcranial magnetic stimulation therapy according to claim 2, characterized in that, The second measuring component includes a grating ruler arranged along the annular guide rail and a reading head arranged at the other end of the axial magnetic sensor array assembly, thereby obtaining the rotation angle of the axial magnetic sensor array assembly.

4. The magnetic field detection device for transcranial magnetic stimulation therapy according to claim 2, characterized in that, The first driving component includes a vertically arranged linear module and a first driving motor. The first driving motor is located on the top of the linear module and is driven by the linear module. The output end of the linear module is fixedly connected to a ring guide rail, thereby driving the axial magnetic sensor array component to move up and down through the ring guide rail.

5. The magnetic field detection device for transcranial magnetic stimulation therapy according to claim 2, characterized in that, The first measuring component includes a vertically arranged support rod and a distance sensor. A linear bearing is fitted on the support rod, which is fixedly connected to the annular guide rail, thereby maintaining synchronous lifting and lowering movements. The distance sensor is located at the top of the support rod and is used to measure the height change of the annular guide rail, thereby obtaining the height change of the axial magnetic sensor array component.

6. The magnetic field detection device for transcranial magnetic stimulation therapy according to claim 1, characterized in that, The fixed support unit includes a clamping device, which includes a movable part and a fixed part. The movable part slides with the fixed part through a slide assembly, thereby achieving the clamping and fixing of the probe under test.

7. The magnetic field detection device for transcranial magnetic stimulation therapy according to claim 1, characterized in that, It also includes a control unit and a host computer, wherein the host computer is connected to the first drive component, the second drive component, and the axial magnetic sensor array component via the control unit.

8. A detection method based on the magnetic field detection device of the transcranial magnetic stimulation therapy instrument according to any one of claims 1 to 7, characterized in that, Includes the following steps: Before starting the test, a set volume of simulated medium is injected into the test tank, and the probe to be tested is fixed above the test tank by the fixed support unit, so that its emission surface is set horizontally downward. After the test begins, the height of the axial magnetic sensor array assembly is adjusted by the first drive assembly, and the rotation of the axial magnetic sensor array assembly around the central axis of the probe under test is driven by the second drive assembly. Thus, the three-dimensional magnetic field distribution formed by the probe under test in the test tank is obtained through the axial magnetic sensor array assembly.

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