A detection system for indicating the degree of contact of basket catheter electrodes

Abstract

The present invention relates to the technical field of medical electrophysiology catheters, and more particularly to a detection system for indicating the degree of contact between electrodes in a basket catheter. In the system, a magnetic field positioning module is used to obtain position information of electrodes on a basket bar; a data acquisition module is used to obtain the impedance between the electrodes themselves and adjacent electrodes on the basket bar, as well as the impedance between a reference electrode pair; and an contact detection module locates a corresponding cell in a pre-established model based on the position information, calculates a historical impedance discrimination coefficient value based on pre-stored discrimination information in the cell, calculates an impedance discrimination coefficient value for the electrode based on the impedance between the electrode itself and adjacent electrodes and the impedance between the reference electrode pair, and determines the contact index of the electrodes on the basket bar based on the number of times the impedance discrimination coefficient value is greater than or equal to the historical impedance discrimination coefficient value. The system can obtain the degree of contact between each electrode on the basket catheter and tissue in real time, facilitating control of the contact between the catheter electrode and tissue.

Description

Technical Field

[0001] The present invention relates to the technical field of medical electrophysiological catheters, and in particular to a detection system for indicating the degree of contact of electrodes of a basket catheter. Background Art

[0002] Electrophysiology catheters are currently widely used in the interventional diagnosis and treatment of cardiac arrhythmias. Both diagnostic mapping and ablation procedures place high demands on the proper alignment of the catheter electrode with the intracavitary tissue. Furthermore, measuring the alignment of the catheter electrode with the tissue serves as a crucial indicator for evaluating the effectiveness of treatment.

[0003] Currently, most catheters with contact detection capabilities on the market utilize pressure sensors placed at the catheter tip. This limited installation location means that pressure sensors can only be installed at the tip, effectively detecting contact at the tip, but not at the rest of the electrodes. In particular, because basket-structured catheters operate in an expanded state, the electrodes on the basket bars are relatively dispersed, making it difficult to detect contact with all electrodes simultaneously using pressure sensors. Summary of the Invention

[0004] In order to overcome the above problems, the present invention proposes a detection system for indicating the degree of contact of the electrodes of the basket catheter.

[0005] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0006] A detection system for indicating the degree of contact of a basket catheter electrode, comprising a magnetic field positioning module, a data acquisition module and a contact detection module.

[0007] The magnetic field positioning module is used to obtain the position information of the electrodes on the basket bars;

[0008] The data acquisition module is used to obtain the impedance between the electrodes themselves and adjacent electrodes on the basket bars, and to obtain the impedance between the reference electrode pairs;

[0009] The adhesion detection module searches for a corresponding cell in a pre-established model based on the position information, calculates a historical impedance discrimination coefficient value based on the pre-stored discrimination information in the cell, calculates the impedance discrimination coefficient value of the electrode based on the impedance between the electrode itself and the adjacent electrode and the impedance between the reference electrode pair, and determines the adhesion index of the electrode on the net basket bar based on the number of times the impedance discrimination coefficient value is greater than or equal to the historical impedance discrimination coefficient value.

[0010] As a preferred solution of the present invention, the pre-stored discrimination information includes: a minimum impedance difference and a maximum impedance difference, wherein the impedance difference is the difference between the impedance of adjacent electrodes on the basket bars and the impedance of the reference electrode pair.

[0011] As a preferred embodiment of the present invention, the adhesion index of the electrode on the mesh basket bar is obtained by summing the number of times the adhesion label is true within a period of time. The condition for the adhesion label to be true is that the impedance discrimination coefficient value of the current electrode is greater than or equal to the historical impedance discrimination coefficient value in the corresponding cell, and the historical impedance discrimination coefficient value is calculated based on pre-stored discrimination information.

[0012] As a preferred embodiment of the present invention, the calculation formula of the impedance discrimination coefficient value of the current electrode is:

[0013]

[0014] in, is the impedance discrimination coefficient value of the current electrode; is the impedance of the i-th pair of adjacent electrodes on the basket bar at time t; is the impedance between the reference electrodes at time t; is the first standard deviation coefficient; is the standard deviation of the impedance data set within the cell.

[0015] As a preferred embodiment of the present invention, the calculation formula of the historical impedance discrimination coefficient value in the cell is:

[0016]

[0017] in, is the historical impedance discrimination coefficient value in the cell; is the impedance of the i-th pair of adjacent electrodes on the basket bar at time t, is the impedance between the reference electrodes at time t, Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of is the second standard deviation coefficient.

[0018] As a preferred embodiment of the present invention, the corresponding cell is found in the pre-established model by obtaining the cell index value, and the solution formula of the cell index value is:

[0019]

[0020] in, Represents the size of the cell in the X, Y, and Z directions respectively; Divide the target area into parts in X, Y and Z directions respectively; It is the position information of the electrodes on the net basket bar.

[0021] As a preferred embodiment of the present invention, the steps of establishing the pre-established model include:

[0022] S1, input electrode position information and impedance information;

[0023] S2, the spatial area where the electrode is located is divided into cells, each cell stores a data set including the electrode position information and impedance information, and the impedance information data set is represented as ,in is the impedance of the i-th pair of adjacent electrodes on the edge of the basket at time t, is the impedance between the reference electrodes at time t, Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of is the reference baseline value;

[0024] S3, recording the cell index value for the cell.

[0025] As a preferred embodiment of the present invention, the pre-established model updating process includes the following steps:

[0026] A1, when storing the current impedance information data set in the cell, calculates the impedance of the adjacent electrodes at time t in the current impedance information data set Impedance between the reference electrode pair The impedance difference between , if the impedance difference is less than or equal to and greater than or equal to , the data set of the current impedance information is stored in the cell, otherwise, the data of the current impedance information is deleted.

[0027] As a preferred embodiment of the present invention,

[0028] Recorded in historical data sets Minimum value of The updated calculation formula is:

[0029]

[0030] Recorded in historical data sets The maximum value The calculation formula is:

[0031]

[0032] in, is the impedance of the adjacent electrode at time t in the current impedance information dataset Impedance between the reference electrode pair The impedance difference between Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of The reference baseline offset represents the difference in impedance between the electrode and the tissue when the electrode is attached and when the electrode is not attached. When it is less than or equal to 10%, .

[0033] As a preferred solution of the present invention, a computer system for displaying the degree of abutment is also included, and the graphical user interface of the computer system includes:

[0034] A preset sticking index setting area, wherein the preset sticking index setting area is used to display a preset sticking index value and a bar diagram;

[0035] A two-dimensional diagram illustrating the degree of electrode contact. The diagram shows rectangular blocks of color arranged along the X-axis and Y-axis. The X-axis indicates the number of each basket catheter; the Y-axis indicates the electrode number of each edge catheter. The grayscale of the rectangular blocks corresponds to the contact index.

[0036] A schematic diagram of electrode positions, wherein the schematic diagram uses multiple concentric circles to represent the electrode number on each basket bar, and uses a line segment from the center of the circle to the outermost circle to refer to each basket bar; the intersection of the line segment and the multiple concentric circles indicates the position of the electrode on the basket bar; the area of ​​the intersection is directly proportional to the degree of contact.

[0037] Based on the same concept, the present invention also proposes a detection system for the degree of contact, comprising any one of the above-mentioned detection systems for indicating the degree of contact of a basket catheter electrode, and further comprising a basket catheter, wherein the basket catheter comprises a handle portion (201), a push rod member (202), a tube portion (203), a moving member (209), and a distal portion (204) on which an electrode is mounted;

[0038] The distal portion (204) includes a catheter head end with a basket layout, and the catheter head end with a basket layout includes basket bars (208), and the basket bars (208) are driven to contract or expand by the movement of a moving component (209) located in the center of the basket; electrodes are arranged axially along the basket bars (208), and a reference electrode is arranged on the moving component (209).

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] 1. The system of the present invention can detect the degree of contact between each electrode on the basket bar and tissue in real time, and quantify it through the calculated contact index, so that the operator can accurately obtain contact information. The contact index with tissue and the degree of contact between each electrode and tissue are displayed in real time, facilitating operation and control.

[0041] 2. The electrode-tissue contact index is determined based on pre-stored discrimination information in the cell, including the minimum impedance difference and the maximum impedance difference. These two values ​​are used to determine the historical impedance discrimination coefficient. When the impedance discrimination coefficient of the current electrode is greater than or equal to the historical impedance discrimination coefficient in the corresponding cell, the contact label is set to true. The contact index of the electrodes on the basket strip is calculated by summing the number of times the contact label is true over a period of time. This pre-stored discrimination information and the method for determining the contact index are based on the specifics of this field, making the determination process reliable and effective.

[0042] 3. In order to make more accurate judgments, the data in the cell is not fixed, but updated in real time according to the collected data, and the part exceeding the threshold is deleted. In addition, considering the difference in impedance value caused by the change of test environment, the parameter , according to the When a certain preset value is set, the parameter cannot be ignored when updating the model Otherwise, the parameter This is an adaptive improvement based on the impedance changes caused by changes in blood concentration in actual applications. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1A 2 is a diagram of a detection system for the degree of contact in Example 1 of the present invention;

[0044] Figure 1B This is a diagram of a graphical user interface of a computer system of the sticking degree detection system in Example 1 of the present invention;

[0045] Figure 2A This is an overall schematic diagram of the basket catheter in Example 1 of the present invention;

[0046] Figure 2B Schematic diagram of the catheter tip of the basket catheter in Example 1 of the present invention;

[0047] Figure 3 Schematic diagram of the electrodes on the basket catheter in contact with tissue in Example 1 of the present invention;

[0048] Figure 4 This is a schematic diagram of impedance collection on a basket catheter in Example 1 of the present invention;

[0049] Figure 5This is a flowchart of the calculation of the sticking index in Example 1 of the present invention;

[0050] Figure 6 This is a schematic diagram of the target area division cells when establishing the impedance model in Example 1 of the present invention;

[0051] Figure 7 A flow chart for establishing an impedance model in Example 1 of the present invention;

[0052] Figure 8 This is a flowchart of the impedance model application in Example 1 of the present invention. DETAILED DESCRIPTION

[0053] The present invention will be further described in detail below in conjunction with test examples and specific embodiments. However, this should not be understood as limiting the scope of the present invention to the following embodiments, and all technologies implemented based on the present invention fall within the scope of the present invention.

[0054] Example 1

[0055] 1. System Description

[0056] like Figure 1A As shown, 100 is a catheter electrode tissue contact recognition system. 101 is the patient, 102 is a reference applied to the body surface, 103 is the distal end of the intracardiac catheter, 104 is the catheter body, and 105 is the catheter handle. 106 is a magnetic field generator, 107 is a body surface reference hub, and 108, 109, and 110 are connecting cables. 111 is a display screen, and 112 is a preset contact index setter. When the contact index is greater than the preset contact index set by the preset contact index setter 112, it is considered to be stable and effective contact; otherwise, it is considered to be intermittent contact or not contacted. 113 is a schematic diagram of the contact degree of each electrode, 114 is the number of each side of the basket catheter, 115 is the number of the catheter electrode on each side, and 116 is a schematic diagram of the contact degree of each catheter electrode. 113 and 116 use different grayscale or color to mark the degree of contact between each electrode and tissue, which has clear and eye-catching characteristics. The 116 catheter electrode contact degree mark, in addition to different grayscale and color, the mark size will also change with the contact degree. The better the contact, the larger the mark.

[0057] The preset sticking index setting area includes a preset sticking index value and a preset sticking index setter 112 in a bar-shaped schematic block, such as Figure 1BAs shown, when the preset adhesion index is set to 7, the pointer on the preset adhesion index setter 112 in the bar-shaped block also points to 7. This means that when the adhesion index is counted, if the adhesion label is true for more than or equal to 7 times within a period of time, it is considered to be stable and effective adhesion, and the effective value of the output ablation energy is high; otherwise, it is considered to be intermittent adhesion or no adhesion, and the effective value of the output ablation energy is low or no. Furthermore, it can also be set to count the adhesion index. If the adhesion label is true for more than or equal to 7 times within a period of time, it is considered to be stable and effective adhesion, and ablation energy can be output; otherwise, it is considered to be intermittent adhesion or no adhesion, and ablation energy cannot be output.

[0058] 117 is a magnetic field positioning module, which is responsible for the reference of the body surface and the positioning of the electrodes of the catheter in the cardiac cavity. 118 is a data acquisition module, which has two acquisition methods. One is direct measurement, which directly acquires the impedance between adjacent electrodes, such as Figure 4 As shown in the lower right part; the other is indirect measurement, which collects the impedance between each electrode of the catheter relative to the body surface reference, and then indirectly obtains the impedance between each electrode of the basket relative to the reference electrode through calculation, such as Figure 4 Shown in the upper left part.

[0059] Figure 4 400 is a schematic diagram of the electrode impedance acquisition principle. Figure 4 The lower right part is the direct measurement of the impedance between the electrodes on each side of the basket and the reference electrode of the basket. Figure 4 The upper left part is the indirect measurement of the impedance between the toroidal electrode and the reference electrode.

[0060] 2. Catheter Description

[0061] like Figure 2A and Figure 2B As shown, 200 is a schematic diagram of a catheter, primarily comprising a handle 201, a push rod 202, a body 203, and a distal end 204 with electrodes mounted thereon. The distal end of the catheter includes a bendable section 205, the curvature of which can be controlled by the push rod 202. The catheter tip has a basket-like design, comprising five basket edges 208 and a central, stretchable moving member 209 that expands the basket. Abutment electrodes 207 are positioned on the basket edges, and a reference electrode 206 is positioned on the moving member 209.

[0062] 3. Snap diagram

[0063] like Figure 3 As shown, 300 is a schematic diagram of the attachment of the catheter to the intracavitary blood vessel, 301 is the left atrium, 302 is the right superior pulmonary vein, 303 is the right inferior pulmonary vein, 304 is the left inferior pulmonary vein, 305 is the left superior pulmonary vein, 306 is the catheter, and 307 is the electrode.

[0064] 4. Impedance acquisition method description

[0065] like Figure 4 As shown, 400 is a schematic diagram of the system impedance acquisition method, 401 is the electrode installed on the edge of the basket, 402 is the reference electrode, and the system acquires the impedance between the reference electrodes. , the impedance between adjacent electrodes on the edge of the basket

[0066] 5. System process description

[0067] like Figure 5 As shown, 500 is a diagram of the system's catheter-electrode-tissue contact detection process. 502 The system acquires catheter spatial position data, obtaining the spatial coordinate positions of each catheter electrode; 504 The system collects impedance data, obtaining impedance data between adjacent electrodes; 506 The target area is divided into spatial cells; 508 The spatial impedance model is established; 510 The model contact detection application process is shown. 510 Outputs the contact index for each electrode and tissue, which is displayed as an image on screen 111 at 512, demonstrating the real-time contact status between the catheter and cardiac tissue.

[0068] 6. Description of the sticking detection process

[0069] The solution of the electrode-tissue proximity indication is divided into a modeling process and a model application process. In the target area cell division process, the cardiac cavity area cell division is realized. The initial position of the catheter can be selected as the center of the target area, and the X, Y, and Z axes are distributed outward for a certain distance, such as 350 mm, as the target area. The cells are set according to the positioning accuracy, such as 10 (mm) x 10 (mm) x 10 (mm). You can also set a variety of cell sizes according to actual conditions. The cell size represents the resolution of the system's proximity detection. The smaller the cell size, the higher the resolution. The modeling process realizes the cell division of the cardiac cavity area and the recording and description of the impedance information in the corresponding area of ​​each cell. In the model application process, the electrode-tissue proximity index is solved based on the record and description of the unit to which the electrode belongs. The output adhesion index of each electrode is displayed on the screen 111 in the form of an image.

[0070] (1) Description of target area cell division

[0071] like Figure 6As shown, 602 is the patient's heart, the target area is part of the space inside the heart, 604 is the cell division of the target area, and 606 is a cell description diagram. The cell is a smaller rectangular space that further divides the target area. The initial position of the catheter is selected as the model center for modeling the target area. The three axial distributions of X, Y, and Z are expanded outward by a certain distance, such as 350mm, as the target area. The cell is set according to the positioning accuracy, such as 10 (mm) x10 (mm) x10 (mm). You can also set a variety of cell sizes according to actual conditions. The cell size represents the resolution of the system's close detection. The smaller the cell size, the higher the resolution. Refer to the 606 cell to represent the three-dimensional space range described as , k is the cell index, and data is input at time t , the cell index is solved as follows:

[0072]

[0073] in, Represents the size of the cell in the X, Y, and Z directions respectively; The number of times the target area is divided in the X, Y, and Z directions respectively, k is the cell index number, and the input data at time t is , is the spatial position coordinate of the electrode, is the spatial coordinate of the electrode corresponding to the reference point, is the impedance of the electrode relative to the reference point, O ( ) are the coordinates of the origin of the three-dimensional space.

[0074] (2) Description of the modeling process

[0075] like Figure 7 As shown, 700 is the modeling process for close proximity detection. 702 inputs electrode position and impedance information. Impedance information includes the impedance between the electrode itself and adjacent electrodes, as well as the impedance between reference electrode pairs. 704 deletes unreasonable data. This deletion is related to the sampling frequency. For example, when a catheter moves rapidly, the sampling frequency is too low relative to the speed of the catheter. The collected data cannot reflect the trajectory of the catheter's movement in real time, resulting in inaccurate coordinate positions and inaccurate positioning cells. Therefore, these data need to be deleted. As a preferred solution, if the spatial distance between the current and subsequent acquisition points is greater than 5 mm, they are deleted. 706 calculates the cell index corresponding to the electrode position. 708 determines whether historical data is already stored in the indexed cell. If not, the impedance information of each electrode is processed as described in 710 and set as the base value in the cell. Common processing methods include averaging or weighted averaging. 712 determines whether the number of historical data stored in the cell exceeds a preset number. If so, the oldest data is removed as in 714 and the latest impedance information is stored as in 716. The model is then updated at 718.

[0076] The cell index of the electrode described in 706 in the spatial impedance model is solved as follows: the three-dimensional space range represented by the cell is described as , k is the cell index, and data is input at time t , the cell index is solved as follows:

[0077]

[0078] in, Represents the size of the cell in the X, Y, and Z directions respectively; The number of times the target area is divided in the X, Y, and Z directions respectively, k is the cell index number, and the input data at time t is , is the spatial position coordinate of the electrode, is the spatial coordinate of the electrode corresponding to the reference point, is the impedance of the electrode relative to the reference point, O ( ) are the coordinates of the origin of the three-dimensional space.

[0079] When there is no historical data in the cell described by 710, the method for comprehensive analysis of the impedance information of all catheter electrodes is described as follows:

[0080] One method is averaging, where the electrode impedance It is expressed as follows:

[0081]

[0082] Another method is weighted average processing, electrode impedance It is expressed as follows:

[0083]

[0084] Where i is the electrode number, nR is the number of impedances collected by the electrode, is the distance between the kth electrode and the reference electrode.

[0085] 716 describes storing the latest data in the cell data set. The data set stored in the cell is represented as ,in is the impedance of the i-th pair of adjacent electrodes on the edge of the basket at time t, is the impedance between the reference electrodes at time t, Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of is the reference baseline value.

[0086] The update model described in 718 refers to updating the relevant discrimination parameters of the electrode and tissue adhesion of the cell where the catheter electrode is located, mainly including , the specific method is described as follows:

[0087] Parameter update: If the impedance between the reference electrodes at time t is equal to its baseline value If the comparison difference is greater than the preset value, the difference cannot be ignored. If the difference is less than or equal to the preset value, the difference can be considered non-existent and set to zero. Update the difference between the parameters before and after It is said that based on experience, the preset value is generally set to 10% of the difference in impedance between when the electrode is in contact with the tissue and when it is not. This value is close to the impedance change caused by changes in blood concentration such as saline drip in the patient during surgery.

[0088] Specifically, The formula for parameter update is:

[0089]

[0090] The formula for parameter update is:

[0091]

[0092] After the parameters are updated at time t, if the difference is less than or equal to the preset value, the difference can be considered non-existent. Zero processing:

[0093]

[0094] (3) Model application description

[0095] like Figure 8 As shown, 802 inputs the electrode position and impedance information, 804 solves the index of the model table corresponding to the current electrode position, 806 applies the discrimination information of the index cell to the impedance collected by the current electrode, and 808 solves the adhesion index. At time t for electrode i, adhesion discrimination is described as follows:

[0096]

[0097]

[0098] if Greater than When t is reached, it is recognized that electrode i is in contact at time t, which is recorded as Otherwise, it is identified as not attached and recorded as . and Have a corresponding relationship, hour, .in, is the standard deviation of the impedance data set within the cell.

[0099] At time t, the adhesion index of electrode i is described as follows:

[0100]

[0101] in, is the time distance pushed forward from time t. The meaning of the expression is the stability of the adhesion at time t and over a period of time. When the value is greater than the preset snap index set by the preset snap index setter 112 , it is considered to be stable and effective snapping; otherwise, it is considered to be intermittent snapping or no snapping.

[0102] 512 updates and displays the contact index of each electrode on screen 111, and updates the contact degree indication information corresponding to each electrode at 113 and 115, visually presenting the contact degree information. Information on whether the electrodes are effectively contacted can serve as an important basis for modeling, mapping, and ablation of the cardiac electrophysiological 3D mapping system.

[0103] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes that come within the meaning and range of equivalents of the claims are intended to be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0104] In addition, it should be understood that although this specification is described in terms of implementation methods, the implementation methods do not only include an independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in the embodiments can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A detection system for indicating the degree of contact of a basket catheter electrode, characterized in that: Including magnetic field positioning module, data acquisition module and proximity detection module, The magnetic field positioning module is used to obtain the position information of the electrodes on the basket bars; The data acquisition module is used to obtain the impedance between the electrodes themselves and adjacent electrodes on the basket bars, and to obtain the impedance between the reference electrode pairs; The abutment detection module finds a corresponding cell in a pre-established model based on the position information, calculates a historical impedance discrimination coefficient value based on pre-stored discrimination information in the cell, calculates an impedance discrimination coefficient value of the electrode based on the impedance between the electrode itself and the adjacent electrode and the impedance between the reference electrode pair, and determines an abutment index of the electrode on the basket bar based on the number of times the impedance discrimination coefficient value is greater than or equal to the historical impedance discrimination coefficient value; The pre-stored discrimination information includes: a minimum impedance difference and a maximum impedance difference, wherein the impedance difference is the difference between the impedance of adjacent electrodes on the basket bar and the impedance of the reference electrode pair; The sticking index of the electrodes on the basket strips is obtained by summing the number of times the sticking label is true within a period of time, and the condition for the sticking label to be true is: the impedance discrimination coefficient value of the current electrode is greater than or equal to the historical impedance discrimination coefficient value in the corresponding cell, and the historical impedance discrimination coefficient value is calculated based on pre-stored discrimination information; The calculation formula of the impedance discrimination coefficient value of the electrode is: in, is the impedance discrimination coefficient value of the current electrode; is the impedance of the i-th pair of adjacent electrodes on the basket bar at time t; is the impedance between the reference electrodes at time t; is the first standard deviation coefficient; is the standard deviation of the impedance data set within the cell; The calculation formula of the historical impedance discrimination coefficient value in the cell is: in, is the historical impedance discrimination coefficient value in the cell; is the impedance of the i-th pair of adjacent electrodes on the basket bar at time t, is the impedance between the reference electrodes at time t, Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of is the second standard deviation coefficient.

2. A detection system for indicating the degree of contact of a basket catheter electrode according to claim 1, characterized in that: The corresponding cell is found in the pre-established model by obtaining the cell index value, and the solution formula for the cell index value is: in, Represents the size of the cell in the X, Y, and Z directions respectively; Divide the target area into parts in X, Y and Z directions respectively; It is the position information of the electrodes on the net basket bar.

3. A detection system for indicating the degree of contact of a basket catheter electrode according to claim 1, characterized in that: The steps of establishing the pre-established model include: S1, input electrode position information and impedance information; S2, the spatial area where the electrode is located is divided into cells, each cell stores a data set including the electrode position information and impedance information, and the impedance information data set is represented as ,in is the impedance of the i-th pair of adjacent electrodes on the edge of the basket at time t, is the impedance between the reference electrodes at time t, Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of is the reference baseline value; S3, recording the cell index value for the cell.

4. A detection system for indicating the degree of contact of a basket catheter electrode according to claim 3, characterized in that: The pre-established model updating process comprises the following steps: A1, when storing the current impedance information data set in the cell, calculates the impedance of the adjacent electrodes at time t in the current impedance information data set Impedance between the reference electrode pair The impedance difference between , if the impedance difference is less than or equal to and greater than or equal to , the data set of the current impedance information is stored in the cell, otherwise, the data of the current impedance information is deleted.

5. A detection system for indicating the degree of contact of a basket catheter electrode according to claim 4, characterized in that: Recorded in historical data sets Minimum value of The updated calculation formula is: Recorded in historical data sets The maximum value The calculation formula is: in, is the impedance of the adjacent electrode at time t in the current impedance information dataset Impedance between the reference electrode pair The impedance difference between Recorded in historical data sets The minimum value of Recorded in historical data sets The maximum value of The reference baseline offset represents the difference in impedance between the electrode and the tissue when the electrode is attached and when the electrode is not attached. When it is less than or equal to 10%, .

6. A detection system for indicating the degree of contact of a basket catheter electrode according to claim 5, characterized in that: Also included is a computer system for displaying the degree of abutment, wherein the graphical user interface of the computer system includes: A preset sticking index setting area, wherein the preset sticking index setting area is used to display a preset sticking index value and a bar diagram; A two-dimensional diagram illustrating the degree of electrode contact, wherein rectangular color blocks are arranged along the X-axis and the Y-axis, and the X-axis indicates the number of each basket catheter; The Y-axis direction indicates the electrode number of the catheter on each edge, and the grayscale of the rectangular color block corresponds to the adhesion index; A schematic diagram of electrode positions, wherein the schematic diagram uses multiple concentric circles to represent the electrode number on each basket bar, and uses a line segment from the center of the circle to the outermost circle to refer to each basket bar; the intersection of the line segment and the multiple concentric circles indicates the position of the electrode on the basket bar; the area of ​​the intersection is directly proportional to the degree of contact.

7. A device for detecting the degree of contact, characterized in that: A detection system for indicating the degree of contact of a basket catheter electrode according to any one of claims 1 to 6, further comprising a basket catheter, wherein the basket catheter comprises a handle portion (201), a push rod member (202), a tube portion (203), a moving member (209), and a distal portion (204) on which an electrode is mounted; The distal portion (204) includes a catheter head end with a basket layout, and the catheter head end with a basket layout includes basket bars (208), and the basket bars (208) are driven to contract or expand by the movement of a moving component (209) located in the center of the basket; electrodes are arranged axially along the basket bars (208), and a reference electrode is arranged on the moving component (209).

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