Magnetocardiography structure based on asymmetric magnetic sensor array

Abstract

The invention discloses a magnetocardiogram instrument structure based on an asymmetric magnetic sensor array, and the magnetocardiogram instrument structure comprises a magnetic shielding body which is composed of a magnetic shielding bottom plate, a magnetic shielding top plate and two magnetic shielding side plates which are oppositely arranged; the non-magnetic pad is arranged on the magnetic shielding bottom plate; the asymmetric magnetic sensor array is fixed on a non-magnetic bracket, and the non-magnetic bracket is arranged on the magnetic shielding side plate on one side; the camera is arranged at the bottom of the non-magnetic bracket corresponding to the central position of the asymmetric magnetic sensor array; the signal collecting and processing system is located at the top of the magnetic shielding top plate and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located; the display unit is arranged at the top of the signal acquisition and processing system and is fixed on the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located, the asymmetric magnetic sensor array and the camera; the signal acquisition and processing system is in communication connection, and the display unit is in communication connection with the signal acquisition and processing system. The magnetocardiogram instrument is simple in structure and light, and can be placed on an operating table accessory to instantly position a focus before an operation.

Description

Technical Field

[0001] The present invention belongs to the technical field of magnetocardiographs, and more specifically, to a magnetocardiograph structure based on an asymmetric magnetic sensor array. Background Art

[0002] During cardiac activity, the directional movement of ions in myocardial cells will be accompanied by the generation of a corresponding magnetic field (i.e., cardiac magnetism). The cardiac magnetism signal contains physiological and pathological information of the heart. The location of heart disease can be determined by detecting the cardiac magnetism signal.

[0003] Currently, there are two major types of relatively mature magnetocardiograph detection systems. The first type is the magnetocardiograph based on superconducting quantum interference sensors, and the second type is the magnetocardiograph based on atomic magnetometers.

[0004] In the first type of magnetocardiograph, the superconducting quantum interference sensor needs to work in an extremely low temperature environment. At the same time, the entire probe and its bracket need to be placed in a magnetic shielding room to shield the interference of external background magnetic noise. The structural characteristics of the first type of magnetocardiograph determine that it needs to be installed in a specific location in the hospital. Therefore, the first type of magnetocardiograph cannot meet the needs of immediate preoperative localization of cardiac lesions. For the second type of magnetocardiograph, although the atomic magnetometer can work at room temperature, which increases its overall installation flexibility, the atomic magnetometer uses a heating coil structure, which makes its effective working time only a few hours. At the same time, the atomic magnetometer has low restart efficiency and requires a near-zero magnetic working environment, which also limits the immediacy of the second type of magnetocardiograph before cardiac surgery. Summary of the invention

[0005] The present invention provides a magnetocardiograph structure based on an asymmetric magnetic sensor array, aiming to improve the above-mentioned problem.

[0006] The present invention is implemented as follows: a magnetocardiograph structure based on an asymmetric magnetic sensor array, the magnetocardiograph structure comprising:

[0007] The magnetic shielding body is composed of a magnetic shielding bottom plate, a magnetic shielding top plate and two magnetic shielding side plates arranged opposite to each other;

[0008] No magnetic pad, set on the magnetic shielding bottom plate;

[0009] An asymmetric magnetic sensor array is fixed to a non-magnetic bracket, and the non-magnetic bracket is arranged on a magnetic shielding side plate on one side;

[0010] A camera is arranged at the bottom of the non-magnetic bracket corresponding to the center position of the asymmetric magnetic sensor array;

[0011] The signal acquisition and processing system is located on the top of the magnetic shielding top plate and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located;

[0012] The display unit is arranged on the top of the signal acquisition and processing system and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located.

[0013] The asymmetric magnetic sensor array, the camera and the signal acquisition and processing system are communicatively connected, and the display unit is communicatively connected to the signal acquisition and processing system.

[0014] Furthermore, the structure also includes: two local shielding plates, which are respectively arranged on the upper and lower sides of the signal acquisition and processing system.

[0015] Furthermore, the local shielding plate includes, from top to bottom, a Permalloy layer, a first glue layer, an acrylic layer, a second glue layer, and a copper foil layer.

[0016] Furthermore, the structure also includes:

[0017] The sliding mechanism is used to adjust the distance between the asymmetric magnetic sensor array and the chest of the subject. The sliding mechanism includes: a slide rail fixed on the magnetic shielding side plate, and a slider arranged at the end of the non-magnetic bracket, and the slider is clamped in the slide rail.

[0018] Furthermore, the asymmetric magnetic sensor array comprises:

[0019] An m*m symmetrical magnetic sensor array, wherein the distance between adjacent magnetic sensors is d; and magnetic sensors are arranged at the center of the smallest matrix unit in the non-central area on both sides of the m*m symmetrical magnetic sensor array.

[0020] Furthermore, the non-magnetic bracket is composed of a non-magnetic bottom plate and a non-magnetic concave plate, the bottom of the non-magnetic bottom plate is provided with a socket array identical to the asymmetric magnetic sensor array, and the pins of the magnetic sensors are inserted into the sockets at corresponding positions; and the non-magnetic concave plate is provided at the bottom of the asymmetric magnetic sensor array.

[0021] Furthermore, an excitation interface and an output interface are arranged on the top of the non-magnetic bottom plate. The excitation interface is used to send excitation current to all magnetic sensors in the asymmetric magnetic sensor array at the same time, and the output interface is used to collect output signals of each magnetic sensor in the asymmetric magnetic sensor array.

[0022] Furthermore, the magnetic sensor is composed of a magnetic sensor body and four ports, two of which are output ports and two are excitation ports, and the socket is correspondingly provided with two output ports and two excitation ports.

[0023] Furthermore, the asymmetric magnetic sensor array and the signal acquisition and processing system transmit data through a first cable group, and the signal acquisition and processing system and the display unit transmit data through a second cable group. The first cable group and the second cable group are placed in the cavity of the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located.

[0024] The magnetocardiograph structure based on an asymmetric magnetic sensor array provided by the present invention has the following beneficial technical effects: (1) The magnetocardiograph structure based on an asymmetric magnetic sensor array is simple and lightweight and can be placed near an operating table, so as to facilitate the immediate positioning of lesions before surgery; (2) The magnetocardiograph dot matrix data measured by the asymmetric magnetic sensor array is fused with the solid image taken by the camera to obtain the magnetocardiograph intensity at various positions of the subject's heart, and the abnormal magnetocardiograph intensity is marked and directly displayed on the top display unit, so as to conveniently, quickly and directly display the lesion position. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic structural diagram of a magnetocardiograph structure based on an asymmetric magnetic sensor array provided in an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of the working principle of a signal acquisition and processing system related to an embodiment of the present invention;

[0027] Figure 3 A schematic diagram of the layout of an asymmetric magnetic sensor array provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram of the structure of a non-magnetic bracket provided in an embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the adaptation of a magnetic sensor and a socket provided in an embodiment of the present invention, wherein (a) is the structure of the sensor, and (b) is the structure of the socket;

[0030] Figure 6 A schematic diagram of the layout of a connecting line group provided in an embodiment of the present invention. Implementation

[0032] The specific implementation modes of the present invention are further explained in detail below by describing the embodiments with reference to the accompanying drawings, so as to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention.

[0033] Figure 1 A schematic diagram of a magnetocardiograph structure based on an asymmetric magnetic sensor array provided in an embodiment of the present invention. For ease of description, only the part related to the embodiment of the present invention is shown. The structure includes:

[0034] The magnetic shielding body is composed of a magnetic shielding bottom plate, a magnetic shielding top plate and two magnetic shielding side plates arranged opposite to each other;

[0035] No magnetic pad, set on the magnetic shielding bottom plate;

[0036] An asymmetric magnetic sensor array is fixed to a non-magnetic bracket, and one side of the non-magnetic bracket is arranged on a magnetic shielding side plate;

[0037] A camera is mounted on the bottom of the non-magnetic bracket corresponding to the center position of the asymmetric magnetic sensor array;

[0038] The signal acquisition and processing system is located on the top of the magnetic shielding top plate and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located;

[0039] The display unit is arranged on the top of the signal acquisition and processing system and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located.

[0040] The asymmetric magnetic sensor array, the camera and the signal acquisition and processing system are communicatively connected, and the display unit is communicatively connected to the signal acquisition and processing system.

[0041] The subject lies on a non-magnetic mat, and the camera collects photos of the human chest area. The photos are the basic reference for locating the lesion. The asymmetric magnetic sensor array is used to measure the cardiac magnetic dot matrix data near the chest. The photos and cardiac magnetic dot matrix data are transmitted to the signal acquisition and processing system. The signal acquisition and processing system first filters, images, and analyzes the cardiac magnetic dot matrix data, and then fuses them with the chest photos. The fused cardiac magnetic intensity at various positions of the subject's heart, and the abnormal cardiac magnetic intensity is marked and transmitted to the display unit as the basis for medical staff to perform surgery.

[0042] In an embodiment of the present invention, the structure also includes: two local shielding plates, which are respectively arranged on the upper and lower sides of the signal acquisition and processing system; the two local shielding plates are respectively a first local shielding plate and a second local shielding plate, wherein the first local shielding plate is arranged between the display unit and the signal acquisition and processing system, and is placed parallel to 2cm to 3cm below the display unit, and is used to shield the electromagnetic noise at the bottom of the display unit; the second local shielding plate is arranged between the signal acquisition and processing system and the magnetic shielding top plate, and is placed parallel to 2cm to 3cm below the signal acquisition and processing system, and is used to shield the electromagnetic noise at the bottom of the signal acquisition and processing system.

[0043] In an embodiment of the present invention, the above-mentioned local shielding plate includes, from top to bottom, a Permalloy layer (length 0.5m, width 0.5m, thickness 2mm), a first glue layer (thickness 0.01mm), an acrylic layer (length 0.5m, width 0.5m, thickness 10mm), a second glue layer (thickness 0.01mm), and a copper foil layer (length 0.5m, width 0.5m, thickness 5mm); wherein, the Permalloy layer of the first local shielding plate is close to the display unit, and the copper foil layer is close to the signal acquisition and processing system, and the Permalloy layer of the second local shielding plate is close to the signal acquisition and processing system, and the copper foil layer is close to the magnetic shielding top plate.

[0044] In an embodiment of the present invention, the structure also includes: a sliding mechanism for adjusting the distance between the asymmetric magnetic sensor array and the subject's chest, the sliding mechanism including: a slide rail fixed on the magnetic shielding side panel and a slider arranged at the end of the non-magnetic bracket, the slider being clamped in the slide rail, and the slider being controlled to move in the slide rail by external force, thereby adjusting the distance between the asymmetric magnetic sensor array and the subject's chest.

[0045] In an embodiment of the present invention, the asymmetric magnetic sensor array and the signal acquisition and processing system perform data transmission via a first cable group, and the signal acquisition and processing system and the display unit perform data transmission via a second cable group. The first cable group and the second cable group are arranged in a cavity of a magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located, which can shield electromagnetic interference in the first cable group and the second cable group while ensuring aesthetics.

[0046] Display unit: used to directly display the image fused by the camera and the asymmetric magnetic sensor array. The display screen needs to be placed horizontally at the top, using an HDMI interface or a DP interface, with a size of no less than 21 inches, a display resolution of no less than 1920*1080, and a touch screen function;

[0047] Signal acquisition and processing system: used to process asymmetric magnetic sensor array and camera data information. Its working principle is as follows: Figure 2 As shown, the input interface receives the camera signal and the signal of the asymmetric magnetic sensor array transmitted by the first cable group. The signal of the asymmetric magnetic sensor array is pre-processed by the analog-to-digital signal converter group and the low-pass filter group, and then enters the digital signal processor to perform array signal imaging algorithm (existing) and singular signal detection algorithm (existing) processing. The data obtained by the two algorithms are then entered into the central processing unit in the microcomputer system for calculation and then input into the image processing unit, and are fused with the image information of the camera (existing). The fused data are output to the output interface together. In addition, the 5V DC power supply is used to power the analog-to-digital signal converter group, the low-pass filter group and the digital signal processor, and the 12V DC power supply is used to power the microcomputer system.

[0048] Asymmetric magnetic sensor array: used to detect cardiac magnetic signals near the chest cavity. The carrier of the asymmetric magnetic sensor array is a non-magnetic bracket, which is 0.4m long, 0.4m wide and 30mm thick. A specially arranged asymmetric magnetic sensor array (tunnel magnetoresistive sensor) is placed on the non-magnetic bracket. Copper wires are laid on the side of the non-magnetic bracket close to the magnetic shielding top plate to transmit the excitation signal and output signal of the magnetic sensor.

[0049] Camera: used to take pictures of the subject's chest, embedded in a non-magnetic bracket corresponding to the center of the asymmetric magnetic sensor array. The camera has a resolution better than 1080p and an outer diameter less than 20mm.

[0050] The magnetocardiograph structure based on an asymmetric magnetic sensor array provided by the present invention has the following beneficial technical effects: (1) The magnetocardiograph structure based on an asymmetric magnetic sensor array is simple and lightweight and can be placed near an operating table, so as to facilitate the immediate positioning of lesions before surgery; (2) The magnetocardiograph dot matrix data measured by the asymmetric magnetic sensor array is fused with the solid image taken by the camera to obtain the magnetocardiograph intensity at various positions of the subject's heart, and the abnormal magnetocardiograph intensity is marked and directly displayed on the top display unit, so as to conveniently, quickly and directly display the lesion position.

[0051] The magnetic field distribution of the heart above the human chest cavity shows an obvious bipolar distribution, and important physiological and pathological information mainly exists in the bipolar regions. Based on this, the asymmetric magnetic sensor array structure designed by the present invention includes:

[0052] An m*m symmetrical magnetic sensor array, wherein the distance between adjacent magnetic sensors is d; and magnetic sensors are arranged at the center of the smallest matrix unit in the non-central area on both sides of the m*m symmetrical magnetic sensor array.

[0053] If m=6, the asymmetric magnetic sensor array is composed of a 6*6 symmetric magnetic sensor array and a magnetic sensor located at the center of the smallest matrix unit in the non-central area on both sides of the 6*6 symmetric magnetic sensor array. Figure 3 The schematic diagram of the layout of the asymmetric magnetic sensor array provided in the embodiment of the present invention establishes a plane rectangular coordinate system with the magnetic sensor at the lower left corner of the array as the origin. First, thirty-six magnetic sensors (blue circles) are arranged in a uniform manner, and the spacing between each magnetic sensor is d (4cm to 5cm). Correspondingly, the coordinates of the thirty-six magnetic sensors are (0,0), (0,d)...(5d,5d). In addition to the thirty-six magnetic sensors, thirteen magnetic sensors (green circles) are arranged at the center of the smallest matrix unit in the non-central area on both sides of the array. Their coordinates are (d / 2,3d / 2), (3d / 2,3d / 2), (7d / 2,3d / 2), (9d / 2,3d / 2), (d / 2,5d / 2), (3d / 2,5d / 2), (5d / 2,5d / 2), (7d / 2,5d / 2), (3d / 2,9d / 2), (d / 2,7d / 2), (3d / 2,7d / 2), (7d / 2,7d / 2), (7d / 2,9d / 2). The positions of these thirteen magnetic sensors correspond to the positions of the two poles of the magnetic cardio signal, thereby increasing the detection resolution of the two poles.

[0054] Figure 4A structural schematic diagram of a non-magnetic bracket provided for an embodiment of the present invention. For the sake of convenience of explanation, only the parts related to the embodiment of the present invention are shown. The non-magnetic bracket is composed of a non-magnetic bottom plate and a non-magnetic concave plate. A socket array identical to the asymmetric magnetic sensor array is provided at the bottom of the non-magnetic bottom plate. The pins of the magnetic sensors are inserted into the sockets at corresponding positions. An excitation interface and an output interface are arranged on the top of the non-magnetic bottom plate. The excitation interface is used to simultaneously send excitation current to all magnetic sensors in the asymmetric magnetic sensor array, and the output interface is used to collect the output signals of each magnetic sensor in the asymmetric magnetic sensor array. The non-magnetic concave plate is provided at the bottom of the asymmetric magnetic sensor array.

[0055] All magnetic sensors in the asymmetric magnetic sensor array are connected to the non-magnetic base plate through a preset socket structure. Since the magnetic sensors are located at the bottom of the non-magnetic base plate, the magnetic sensors are in an "inverted" state. The advantage of this design is that it reduces the distance between the magnetic sensors and the human chest cavity, thereby increasing the strength of the measured cardiac magnetic signal. Below the magnetic sensor is a non-magnetic concave plate with a thickness of 1mm to 2mm. Its function is to protect the inverted magnetic sensors and to level all magnetic sensors so that they are on the same horizontal plane. The inner dimensions of the non-magnetic concave plate must be equal to the outer dimensions of the non-magnetic base plate so that the two can be nested in structure.

[0056] The structure of a single magnetic sensor is as follows Figure 5 As shown in (a), the structure of the socket is as follows Figure 5 As shown in (b), the magnetic sensor type can be a tunnel magnetoresistive sensor. The magnetic sensor consists of a magnetic sensor body and four ports, including two output ports and two excitation ports. Ports A1 and A2 of the magnetic sensor are output ports, and ports A3 and A4 are excitation ports. Correspondingly, ports B1 and B2 in the socket structure are output ports, and ports B3 and B4 are excitation ports. Ports B1, B2, B3, and B4 are symmetrically distributed in a circular area with a radius of R, and the value of R is between 3 cm and 5 cm. The distance between the center of port B1 and port B2, and between the center of port B3 and port B4 is d1, and the value of d1 is between 1 cm and 1.5 cm. The distance between the center of port B1 and port B4, and between the center of port B2 and port B3 is d2, and the value of d2 is between 2 cm and 2.5 cm.

[0057] Take four adjacent magnetic sensors in a 49-channel asymmetric magnetic sensor array as an example. Figure 6A simplified layout of the connection line group is shown, with the red line being the excitation line and the black line being the output line. Port A3 and Port A4 of all magnetic sensors are directly connected to the positive and negative poles of the excitation interface, thus achieving the purpose of exciting all magnetic sensors with one excitation interface. At the same time, Port A1 and Port A2 of each magnetic sensor are respectively connected to the output interface, which has a total of ninety-eight holes corresponding to forty-nine magnetic sensors. In particular, the excitation interface and the output interface are set separately, which is also conducive to simplifying signal regulation.

[0058] The asymmetric magnetic sensor array provided by the present invention has the following beneficial technical effects:

[0059] (1) The imaging resolution of the two polar regions of the cardiomagnetic signal is improved in a targeted manner, thereby improving the utilization efficiency of the magnetic sensor; (2) The excitation interface and the output interface are set separately, and a method of using one excitation interface to excite all magnetic sensors not only simplifies the layout of the array connection line group, but also helps to simplify the signal regulation; (3) The non-magnetic bracket structure designed by the invention for fixing the asymmetric magnetic sensor array shortens the distance between the magnetic sensor and the human chest cavity, protects the inverted magnetic sensor, and flattens all the magnetic sensors so that they are on the same horizontal plane.

[0060] The present invention has been described exemplarily. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A magnetocardiograph structure based on an asymmetric magnetic sensor array, characterized in that: The magnetocardiograph structure comprises: The magnetic shielding body is composed of a magnetic shielding bottom plate, a magnetic shielding top plate and two magnetic shielding side plates arranged opposite to each other; No magnetic pad, set on the magnetic shielding bottom plate; An asymmetric magnetic sensor array is fixed to a non-magnetic bracket, and the non-magnetic bracket is arranged on a magnetic shielding side plate on one side; A camera is arranged at the bottom of the non-magnetic bracket corresponding to the center position of the asymmetric magnetic sensor array; The signal acquisition and processing system is located on the top of the magnetic shielding top plate and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located; The display unit is arranged on the top of the signal acquisition and processing system and fixed to the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located. The asymmetric magnetic sensor array, the camera and the signal acquisition and processing system are communicatively connected, and the display unit is communicatively connected to the signal acquisition and processing system.

2. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 1, characterized in that: The structure also includes: two local shielding plates, which are respectively arranged on the upper and lower sides of the signal acquisition and processing system.

3. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 2, characterized in that: The local shielding plate includes, from top to bottom, a Permalloy layer, a first glue layer, an acrylic layer, a second glue layer, and a copper foil layer.

4. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 1, characterized in that: The structure also includes: The sliding mechanism is used to adjust the distance between the asymmetric magnetic sensor array and the chest of the subject. The sliding mechanism includes: a slide rail fixed on the magnetic shielding side plate, and a slider arranged at the end of the non-magnetic bracket, and the slider is clamped in the slide rail.

5. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 1, characterized in that: The asymmetric magnetic sensor array includes: An m*m symmetrical magnetic sensor array, wherein the distance between adjacent magnetic sensors is d; and magnetic sensors are arranged at the center of the smallest matrix unit in the non-central area on both sides of the m*m symmetrical magnetic sensor array.

6. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 1, characterized in that: The non-magnetic bracket consists of a non-magnetic bottom plate and a non-magnetic concave plate. The bottom of the non-magnetic bottom plate is provided with a socket array identical to the asymmetric magnetic sensor array, and the pins of the magnetic sensors are inserted into the sockets at corresponding positions; and the non-magnetic concave plate is provided at the bottom of the asymmetric magnetic sensor array.

7. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 6, characterized in that: An excitation interface and an output interface are arranged on the top of the non-magnetic bottom plate. The excitation interface is used to send excitation current to all magnetic sensors in the asymmetric magnetic sensor array at the same time, and the output interface is used to collect output signals of each magnetic sensor in the asymmetric magnetic sensor array.

8. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 6, characterized in that: The magnetic sensor consists of a magnetic sensor body and four ports, two of which are output ports and two are excitation ports. The socket is correspondingly provided with two output ports and two excitation ports.

9. The magnetocardiograph structure based on an asymmetric magnetic sensor array as claimed in claim 1, characterized in that: The asymmetric magnetic sensor array and the signal acquisition and processing system transmit data through the first cable group, and the signal acquisition and processing system and the display unit transmit data through the second cable group. The first cable group and the second cable group are placed in the cavity of the magnetic shielding side plate on the side where the asymmetric magnetic sensor array is located.

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