CN115886976A - Detection system for indicating electrode sticking degree of basket catheter - Google Patents
Detection system for indicating electrode sticking degree of basket catheter Download PDFInfo
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Abstract
The invention relates to the technical field of medical electrophysiological catheters, in particular to a detection system for indicating the electrode attachment degree of a basket catheter, wherein in the system, a magnetic field positioning module is used for acquiring the position information of an electrode on a basket strip; the data acquisition module is used for acquiring the impedance between the electrode on the basket bar and the adjacent electrode and acquiring the impedance between the reference electrode pair; the attachment detection module searches a corresponding cell in a pre-established model according to the position information, calculates a historical impedance discrimination coefficient value according to discrimination information pre-stored in the cell, calculates an impedance discrimination coefficient value of an electrode according to the impedance between the electrode and an adjacent electrode and the impedance between a reference electrode pair, and determines an attachment index of the electrode on the basket strip according to the times that the impedance discrimination coefficient value is greater than or equal to the historical impedance discrimination coefficient value. The sticking degree of each electrode on the basket catheter and the tissue can be obtained in real time, and the control of the sticking of the catheter electrode and the tissue is facilitated.
Description
Technical Field
The invention relates to the technical field of medical electrophysiological catheters, in particular to a detection system for indicating the electrode attachment degree of a basket catheter.
Background
At present, the electrophysiology catheter is widely applied to the field of arrhythmia interventional diagnosis and treatment. The diagnosis, mapping and ablation treatment process has high requirements on the close contact of the catheter electrode and the tissue in the cavity. In addition, the detection of the contact between the catheter electrode and the tissue can be used as an important basis for judging the effect of the treatment process.
The catheter that has to paste to detect in the market at present is realized through the form of laying pressure sensor at the catheter head end mostly, and pressure sensor mounted position is limited, and only the head end is installed, realizes that the catheter head end pastes and pastes the detection, can not realize that non-head end divides the attaching of electrode to paste the detection. Particularly, because the catheter of the basket structure is in an expanded state during operation, the electrodes on the basket strips are distributed dispersedly, the detection of the electrode attachment degree is difficult to realize by installing a pressure sensor, and the electrode attachment degree is difficult to acquire simultaneously.
Disclosure of Invention
The invention aims to overcome the problems and provides a detection system for indicating the electrode abutting degree of a basket catheter.
In order to achieve the above purpose, the invention provides the following technical scheme:
a detection system for indicating the electrode sticking degree of a basket catheter comprises a magnetic field positioning module, a data acquisition module and a sticking detection module,
the magnetic field positioning module is used for acquiring the position information of the electrodes on the basket strips;
the data acquisition module is used for acquiring the impedance between the electrode on the basket bar and the adjacent electrode and acquiring the impedance between the reference electrode pair;
the attachment detection module searches a corresponding cell in a pre-established model according to the position information, calculates a historical impedance discrimination coefficient value according to discrimination information pre-stored in the cell, calculates an impedance discrimination coefficient value of an electrode according to the impedance between the electrode and an adjacent electrode and the impedance between the reference electrode pair, and determines the attachment index of the electrode on the basket strip according to the times that the impedance discrimination coefficient value is greater than or equal to the historical impedance discrimination coefficient value.
As a preferred aspect of the present invention, the pre-stored discrimination information includes: a minimum impedance difference, a maximum impedance difference, the impedance difference being the difference in impedance between adjacent electrodes on the basket strips and the reference electrode pair.
As a preferred aspect of the present invention, the sticking index of the electrodes on the basket bar is obtained by summing the number of times the sticking label is true in a period of time, where the condition that the sticking label is true is: and the impedance judgment coefficient value of the current electrode is greater than or equal to the historical impedance judgment coefficient value in the corresponding unit cell, and the historical impedance judgment coefficient value is calculated according to prestored judgment information.
As a preferred embodiment of the present invention, the calculation formula of the impedance discrimination coefficient value of the current electrode is:
wherein, diff i Is the impedance discrimination coefficient value of the current electrode;
impedance of the ith pair of adjacent electrodes on the basket strip at the time t; />
Is the impedance between the reference electrodes at time t; coef 1 Is a first standard deviation coefficient; σ is the standard deviation of the impedance data set within the cell.
As a preferred embodiment of the present invention, the calculation formula of the historical impedance discrimination coefficient value in the cell is:
diff rule ＝Diff min +coef 2 *(Diff max -Diff min )
wherein, diff rule Determining a coefficient value for the historical impedance in the cell;
is the impedance of the ith pair of adjacent electrodes on the basket strip at the moment t->
Diff for impedance at time t between reference electrodes min Method for recording in a history data set>
Minimum value of, diff max Is recorded for historical data set->
Maximum value of (d); coef 2 Is the first standard deviation factor.
As a preferred solution of the present invention, the cell corresponding to the pre-established model is found by using a cell index value, and a solution formula of the cell index value is as follows:
wherein, w x 、w y 、w z Respectively representing the size of the unit cell in the X, Y, Z direction; n is x 、n y 、n z Dividing the target area in the direction of X, Y, Z;
is the position information of the electrodes on the mesh basket strips.
As a preferred embodiment of the present invention, the step of building the pre-built model includes:
s1, inputting position information and impedance information of an electrode;
s2, dividing the space region where the electrode is located into cells, wherein the cells are provided with data sets comprising position information and impedance information of the electrode, and the data sets of the impedance information are expressed as
Wherein->
For the impedance of the ith pair of adjacent electrodes on the edge of the basket at the moment t->
Diff for impedance at time t between reference electrodes min For records in a history data set>
Minimum value of, diff max For records in a history data set>
Maximum value of (2), R refBase Is a reference baseline value;
and S3, recording a cell index value for the cell.
As a preferred embodiment of the present invention, the pre-established model updating process includes the following steps:
a1, when storing the data set of the current impedance information in the cell, calculating the impedance of the adjacent electrode at the t moment in the data set of the current impedance information
And a reference electrode pair>
The difference in impedance between->
If the difference in impedance is less than or equal to Diff max And greater than or equal to Diff min Storing the data set of the current impedance information into the cell, otherwise, deleting the data of the current impedance information.
As a preferred embodiment of the present invention, it is,
centrally recorded in historical data
Minimum value Diff of min The updated calculation formula is:
centrally recorded in historical data
Maximum value of Diff max The calculation formula of (2) is as follows:
wherein, the first and the second end of the pipe are connected with each other,
is the impedance at time t of the adjacent electrode in the data set of the current impedance information->
And a reference electrode pair>
The difference in impedance between; diff min Is recorded for historical data set->
Minimum value of, diff max For records in a history data set>
Maximum value of, Δ refBase A reference baseline value offset characterizing a differential impedance value between electrode and tissue when attached and unattached, when said reference baseline value offset Δ refBase When 10% or less, Δ refBase ＝0。
As a preferred aspect of the present invention, there is also included a computer system for displaying the degree of fit, a graphical user interface of the computer system, including,
the preset sticking index setting area is used for displaying the numerical value of a preset sticking index and a bar-shaped schematic block;
the electrode sticking degree schematic two-dimensional graph is characterized in that rectangular color blocks are distributed along the X-axis direction and the Y-axis direction in the electrode sticking degree schematic two-dimensional graph, and the X-axis direction refers to the number of each basket conduit; the Y-axis direction refers to the electrode number of the catheter on each side, and the gray level of the rectangular color block corresponds to the attachment index;
the electrode position schematic diagram uses a plurality of concentric circles to represent the electrode number on each basket strip, and uses a line segment from the circle center to the outermost circle to represent each basket strip; the intersection point of the line segment and the plurality of concentric circles indicates the position of the electrode on the basket bar; the area of the intersection point is in direct proportion to the attaching degree.
Based on the same concept, the invention also provides a detection system for the degree of contact, which comprises the detection system for indicating the electrode contact degree of the basket catheter, and further comprises the basket catheter, wherein the basket catheter comprises a handle part (201), a push rod member (202), a tube body part (203), a moving member (209) and a distal end part (204) provided with the electrode;
the distal part (204) comprises a basket layout catheter head, the basket layout catheter head comprises a basket strip (208), and the basket strip (208) is driven to contract or expand by the movement of a motion member (209) positioned at the center of the basket; the electrodes are arranged axially along the basket bars (208) and the reference electrode is arranged on the moving member (209).
Compared with the prior art, the invention has the beneficial effects that:
1. by adopting the system, the detection of the sticking degree of each electrode on the basket bar to the tissue can be obtained in real time, and the sticking information can be conveniently and accurately obtained by an operator through quantification through the calculated sticking index. The index of the electrode close to the tissue and the real-time display of the close degree of each electrode to the tissue are convenient for operation and control.
2. The sticking index of the electrode and the tissue is judged through prestored distinguishing information in the unit cell, and the prestored distinguishing information comprises: minimum impedance difference, maximum impedance difference. Through the two values, a historical impedance judgment coefficient value can be obtained, when the impedance judgment coefficient value of the current electrode is larger than or equal to the historical impedance judgment coefficient value in the corresponding cell, the sticking label is set to be true, and the sticking index of the upper electrode of the basket strip is obtained by summing the times that the sticking label is true in a period of time. The pre-stored discrimination information and the method for judging the attachment index are concepts formed based on the characteristics in the field, and the discrimination process is reliable and effective.
3. For more accurate judgment, the data in the cells are not fixed in a layer, but are updated in real time according to the collected data, and the parts exceeding the threshold are deleted. The parameter Δ is introduced also in consideration of the difference in the impedance value due to the change in the test environment refBase According to when Δ refBase If the value is larger than a predetermined value, the parameter Δ cannot be ignored when updating the model refBase The influence of which otherwise the parameter Δ may be varied refBase Set to 0, which is an adaptation based on the impedance change caused by the blood concentration change in practical applications.
Description of the drawings:
FIG. 1A is a diagram of a system for detecting the degree of adhesion in embodiment 1 of the present invention;
FIG. 1B is a graphical user interface diagram of a computer system of the system for detecting an alignment level according to embodiment 1 of the present invention;
FIG. 2A is a schematic view of the entire basket conduit in embodiment 1 of the present invention;
FIG. 2B is a schematic view of the catheter tip of the basket catheter in accordance with embodiment 1 of the present invention;
FIG. 3 is a schematic view showing the contact of the electrodes and the tissues on the basket catheter in accordance with embodiment 1 of the present invention;
FIG. 4 is a schematic diagram showing impedance acquisition on basket conduits in example 1 of the present invention;
FIG. 5 is a flowchart of the alignment index calculation in embodiment 1 of the present invention;
fig. 6 is a schematic diagram of a target area division cell during impedance model establishment in embodiment 1 of the present invention;
FIG. 7 is a flowchart of impedance model establishment in embodiment 1 of the present invention;
fig. 8 is a flowchart of an impedance model application in embodiment 1 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, but is intended to include all technical aspects that can be achieved based on the present disclosure.
Example 1
1. Description of the System
As shown in fig. 1A, 100 is a catheter-electrode tissue-apposition identification system. 101 is a patient, 102 is a reference for applying on the body surface, 103 is the distal end of the catheter in the cardiac chamber, 104 is the catheter tube, 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. For the display screen, 112 is a preset sticking index setter, and when the sticking index is larger than the preset sticking index set by the preset sticking index setter 112, stable and effective sticking is considered, otherwise, intermittent sticking or non-sticking is considered. 113 is a diagram showing the electrode contact degree, 114 is the number of each side of the basket catheter, 115 is the electrode number of the catheter on each side, and 116 is a diagram showing the electrode contact degree of the catheter. 113 and 116 marks the sticking degree of each electrode and the tissue through different gray scales or different colors, has clear and striking characteristics, and 116 the catheter electrode sticking degree mark, except that the gray scales and the colors are different, the size of the mark can also be changed along with the different sticking degrees, the better the sticking is, and the larger the mark is.
The preset attachment index setting region includes a preset attachment index value and a bar-shaped block-shaped preset attachment index setter 112, and as shown in fig. 1B, when the preset attachment index is set to 7, the pointer on the bar-shaped block-shaped preset attachment index setter 112 also points to 7. The method includes that the sticking index is counted, the number of times that a sticking label is true in a period of time is greater than or equal to 7 times, stable and effective sticking is considered, the output ablation energy effective value is high, otherwise, intermittent sticking or non-sticking is considered, and the output ablation energy effective value is low or none. Furthermore, the number of times that the sticking label is true is greater than or equal to 7 times within a period of time, the sticking label is considered to be stable and effective sticking and can output ablation energy, otherwise, the sticking label is considered to be intermittent sticking or not sticking and can not output ablation energy.
117 is a magnetic field positioning module which is responsible for body surface reference and positioning of the position of each electrode of the catheter in the heart cavity. 118 is a data acquisition module, and the acquisition mode is divided into two types, one is direct measurement, and the impedance between adjacent electrodes is directly acquired, as shown in the lower right part of fig. 4; the other is indirect measurement, which acquires the impedance between each electrode of the catheter and a body surface reference, and then indirectly obtains the impedance between each electrode of the basket and the reference electrode through operation, as shown in the upper left part of fig. 4.
Fig. 4 is a schematic diagram of electrode impedance acquisition, 400 is a schematic diagram of an impedance measurement principle, the lower right part of fig. 4 is used for directly measuring the impedance between the electrode on each side of the basket and the basket reference electrode, and the upper left part of fig. 4 is used for indirectly measuring the impedance between the torus electrode and the reference electrode.
2. Description of catheters
As shown in fig. 2, 200 is a schematic view of a catheter, generally comprising a handle portion 201, a pusher member 202, a shaft portion 203, and a distal portion 204 to which electrodes are mounted. The distal end of the catheter contains a bendable section 205 whose bending arc can be controlled by 202 pushing the rod. The head end of the catheter is a basket layout and comprises 5 basket edges 208, and a moving component 209 which can stretch the center to realize basket expansion. Disposed next to the basket edge is an electrode 207 and a reference electrode 206 is disposed on a moving member 209.
3. Schematic view of abutment
As shown in fig. 3, 300 is a schematic view of catheter-intraluminal placement, 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.
4. Description of impedance acquisition mode
As shown in FIG. 4, 400 is a schematic diagram of the system impedance acquisition mode, 401 is an electrode installed on the edge of the basket, 402 is a reference electrode, and the system acquires an impedance R between the reference electrodes InRef Resistance R between adjacent electrodes on the basket edge i
5. Description of System flow
As shown in FIG. 5, 500 is a diagram of a catheter-electrode tissue apposition detection process of the system. 502, acquiring spatial position data of the catheter by the system to obtain spatial coordinate positions of electrodes of the catheter; 504, acquiring impedance data by a system to obtain impedance data between adjacent electrodes; 506, dividing space cells of a target area; 508 establishing a space impedance model; 510 is the model abutment detection application process. 510 outputs the index of the degree of contact between each electrode and the tissue, 512 displays the index on the screen 111 in the form of an image, and represents the real-time contact state of the catheter and the heart cavity tissue.
6. Description of the procedure for detection of attachment
The electrode and tissue proximity indication solving process is divided into a modeling process and a model application process. Target area cell division process realizes heart chamber region cell division, can select the pipe initial position as target area center, X, Y, Z three axial distribution expands certain distance outward, for example 350mm, as the target area, the cell sets up according to positioning accuracy, for example 10 (mm) x10 (mm) x10 (mm), also can set up multiple cell size according to actual conditions, cell size represents the resolution that the system leaned on the detection, the smaller the cell size the resolution is higher. And in the modeling process, cell division of the heart cavity area and recording and description of impedance information in the area corresponding to each cell are realized. And in the model application process, the electrode and tissue sticking degree index is solved according to the record and description of the unit to which the electrode belongs. The output alignment indexes of the electrodes are displayed in the form of an image on the screen 111.
(1) Target area cell partition description
As shown in FIG. 6, 602 is the heart of a patient, the target area is a partial space in the heart, 604 is the target area cell division, and 606 is the cell delineationThe cells are smaller rectangular spaces that further divide the target area. The initial position of a catheter is selected as the center of a model for modeling a target area, X, Y, Z are distributed axially and are expanded outwards for a certain distance, for example, 350mm, the catheter is used as the target area, cells are arranged according to positioning accuracy, for example, 10 (mm) x10 (mm) x10 (mm), various cell sizes can also be arranged according to actual conditions, the cell size represents the resolution of system attachment detection, and the smaller the cell size, the higher the resolution. The three-dimensional spatial range represented by reference 606 cells is depicted as Cell k ([x min ,x max ),[y min ,y max ),[z min ,z max ) K is cell index, and data is input at time t
The cell index is solved as follows: />
Wherein w x 、w y 、w z Respectively representing the size of the unit cell in the X, Y, Z direction; n is x 、n y 、n z The target area is divided into parts in the direction of X, Y, Z, k is the index number of the cell, and the input data at the time t is
Is the spatial position coordinate of the electrode, is based on the measured value>
For the spatial position coordinates of the reference point corresponding to the electrode, < > or >>
Is the impedance of the electrode with respect to a reference point, O (x) o ，y o ，z o ) Is the origin coordinate of the three-dimensional space.
(2) Modeling process description
As shown in fig. 7, 700 is an alignment detection modeling process. 702 is input electrode position and impedance information, the impedance information comprises impedance between the electrode itself and adjacent electrodes and impedance information between reference electrode pairs; 704. in order to delete unreasonable data, the unreasonable data is deleted related to sampling frequency, for example, when the catheter moves rapidly, the sampling frequency is low relative to the moving speed of the catheter, the collected data cannot reflect the moving track of the catheter in real time, therefore, the obtained coordinate position is inaccurate, and the positioning cells are also inaccurate, so that the unreasonable data need to be removed. And as a preferable scheme, rejecting the current and the last two acquisition points when the space distance is more than 5 mm. 706 is the index of the cell corresponding to the position of the calculation electrode; 708, judging whether historical data are stored in the index cell, if not, comprehensively processing impedance information of each electrode according to 710, and setting the impedance information as a basic value into the cell by using a common comprehensive processing method such as averaging or weighted averaging; 712, determining whether the number of the history data stored in the cell exceeds a predetermined number, if so, removing 714 the oldest data, and storing 716 the newest impedance information; then 718 updates the model.
706 the cell index solution for the electrode in the spatial impedance model is as follows: the three-dimensional spatial extent of the Cell representation is described as Cell k ([x min ,x max ),[y min ,y max ),[z min ,z max ) K is cell index, and data is input at time t
The cell index is solved as follows:
wherein, w x 、w y 、w z Respectively representing the size of the unit cell in the X, Y, Z direction; n is a radical of an alkyl radical x 、n y 、n z The target areas are X, Y,Dividing the number of copies in the Z direction, wherein k is the index number of the cell, and the input data at the time t is
Is the spatial position coordinate of the electrode, is based on the measured value>
For the spatial position coordinates of the reference point corresponding to the electrode, < > or >>
Is the impedance of the electrode with respect to a reference point, O (x) o ，y o ，z o ) Is the origin coordinate of the three-dimensional space.
710 the method of using the integrated analysis of all electrode impedance information of a catheter when there is no historical data in the cell is described as follows:
one such method is averaging, the electrode impedance R i Is represented as follows:
another method is weighted averaging, the electrode impedance R i Is represented as follows:
wherein i is the electrode number, nR is the impedance number collected by the electrode, dis k,ref The distance between the kth electrode and the reference electrode.
716 into the cell dataset, the dataset stored within the cell is represented as
Wherein->
The impedance of the ith pair of adjacent electrodes at the moment t on the edge of the basket,
diff for impedance at time t between reference electrodes min Is recorded for historical data set->
Minimum value of (2), diff max For records in a history data set>
Maximum value of (1), R refBase Is a reference baseline value.
718, wherein the updating model is related to the judgment parameters for updating the electrode-tissue contact of the cell in which the catheter electrode is positioned, and mainly comprises R refBase ,Diff min ,Diff max The specific method is described as follows:
R refBase parameter updating: if the impedance between the reference electrodes at time t is equal to its baseline value R refBase If the comparison difference is larger than the preset value, the difference cannot be ignored, and if the difference is smaller than or equal to the preset value, the difference can be considered to be absent, and zero setting processing is carried out. R refBase Parameter Δ for difference value before and after update refBase It is shown that the empirically preset value is typically set to 10% of the differential impedance value between electrode-to-tissue contact and non-contact, which is close to the impedance change caused by blood concentration changes during surgery, such as a patient's saline drip.
In particular, diff min The formula for parameter update is:
Diff max the formula for parameter update is:
after the parameter at time t is updated, when the difference is less than or equal to the preset value, the difference can be considered to be absent, and delta refBase Zero setting processing:
Δ refBase ＝0
(3) Model application description
As shown in fig. 8, 802 inputs electrode position and impedance information, 804 solves the index of the model table corresponding to the current electrode position, and 806 applies the discrimination information of the index cell to the impedance acquired by the current electrode; 808. solving for the fit degree index. At the time of the electrode t, the alignment judgment is described as follows:
diff rule ＝Diff min +coef 2 *(Diff max -Diff min )
if diff i Greater than diff rule When the contact is detected, i electrode is close to t moment and is recorded as
Otherwise, it is recognized as not attached and is recorded as->
coef 1 And coef 2 Having a correspondence relationship, coef 1 When =1, coef 2 =0.683. Where σ is the standard deviation of the impedance data set within the cell.
At time i, electrode t, the alignment index is described as follows:
wherein t0 is the forward time distance at the time t.
The expression means the degree of stability of the abutment at time t and over a period of time. When/is>
If the preset fitting index is greater than the preset fitting index set by the preset fitting index setter 112, stable and effective fitting is considered, otherwise, intermittent fitting or non-fitting is considered.
512, the alignment index of each electrode is updated and displayed on the screen 111, and the alignment degree indication information corresponding to each electrode of 113 and 115 is updated, so that the alignment degree information is visually presented. The information of whether the electrode is effectively attached or not can be used as an important basis for modeling, mapping and ablation of the heart electrophysiology three-dimensional mapping system.
While there have been shown and described what are at present considered the fundamental principles and essential features of the invention and its advantages, it will be apparent to those skilled in the art that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, the embodiments do not include only one independent technical solution, and such description is only for clarity, and those skilled in the art should take the description as a whole, and the technical solutions in the embodiments may be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims (11)
1. A detection system for indicating the electrode sticking degree of a basket catheter is characterized by comprising a magnetic field positioning module, a data acquisition module and a sticking detection module,
the magnetic field positioning module is used for acquiring the position information of the electrodes on the basket strips;
the data acquisition module is used for acquiring the impedance between the electrode on the basket bar and the adjacent electrode and acquiring the impedance between the reference electrode pair;
the attaching detection module searches a corresponding cell in a pre-established model according to the position information, calculates a historical impedance discrimination coefficient value according to discrimination information pre-stored in the cell, calculates an impedance discrimination coefficient value of an electrode according to the impedance between the electrode and an adjacent electrode and the impedance between the reference electrode pair, and determines an attaching index of the electrode on the basket strip according to the times that the impedance discrimination coefficient value is greater than or equal to the historical impedance discrimination coefficient value.
2. A sensing system for indicating electrode apposition of basket catheters according to claim 1, wherein the pre-stored identification information comprises: a minimum impedance difference, a maximum impedance difference, the impedance difference being the difference between the impedance of the adjacent electrode on the basket strip and the impedance between the pair of reference electrodes.
3. A test system for indicating electrode alignment of a basket catheter according to claim 1 wherein the alignment index of the electrodes on the basket bar is determined by summing the number of times the alignment label is true over a period of time, the condition for the alignment label being true being: and 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 according to prestored discrimination information.
4. A test system for indicating electrode proximity of a basket catheter according to claim 1, wherein said impedance discriminant coefficient value for said electrode is calculated as:
wherein, diff i Is the impedance discrimination coefficient value of the current electrode;
impedance of the ith pair of adjacent electrodes on the basket strip at the time t; />
Is the impedance between the reference electrodes at time t; coef 1 Is a first standard deviation coefficient; σ is the standard deviation of the impedance data set within the cell.
5. A test system for indicating electrode apposition degree of basket catheter according to claim 1, wherein the historical impedance discriminant coefficient values in the cells are calculated by the formula:
diff rule ＝Diff min +coef 2 *(Diff max -Diff min )
wherein, diff rule Determining a coefficient value for the historical impedance in the cell;
is the impedance of the ith pair of adjacent electrodes on the basket strip at the moment t->
Diff for impedance at time t between reference electrodes min Is recorded for historical data set->
Minimum value of, diff max Is recorded for historical data set->
The maximum value of (a); coef 2 Is the first standard deviation coefficient.
6. The system of claim 1, wherein the corresponding cell found in the pre-established model is obtained by a cell index value, and the cell index value is solved by the following formula:
wherein, w x 、w y 、w z Respectively representing the size of the unit cell in the X, Y, Z direction; n is x 、n y 、n z Dividing the target area in the direction of X, Y, Z;
is the position information of the electrodes on the basket strips.
7. A test system for indicating electrode apposition of basket catheters according to claim 1 wherein the pre-established model establishing step comprises:
s1, inputting position information and impedance information of an electrode;
s2, dividing the space region where the electrode is located into cells, wherein the cells are provided with data sets comprising position information and impedance information of the electrode, and the data sets of the impedance information are expressed as
Wherein +>
For the impedance at the moment t of the i-th pair of adjacent electrodes on the basket side>
Diff for impedance at time t between reference electrodes min Is recorded for historical data set->
Minimum value of, diff max Is recorded for historical data set->
Maximum value of (1), R refBase Is a reference baseline value;
and S3, recording a cell index value for the cell.
8. A test system for indicating electrode apposition of basket catheters according to claim 7 wherein the pre-established model update procedure comprises the steps of:
a1, when storing the data set of the current impedance information in the unit cell, calculating the impedance of the adjacent electrode at the time t in the data set of the current impedance information
Impedance with reference electrode pair>
The difference in impedance between->
If the difference in impedance is less than or equal to Diff max And greater than or equal to Diff min Storing the data set of the current impedance information into the cell, otherwise, deleting the data of the current impedance information.
9. A test system for indicating electrode apposition of basket conduits according to claim 8,
centrally recorded in historical data
Minimum value of Diff min The updated calculation formula is:
recorded in a historical data set
Maximum value of Diff max The calculation formula of (c) is:
wherein, the first and the second end of the pipe are connected with each other,
is the impedance at time t of an adjacent electrode in a data set of present impedance information>
Impedance with reference electrode pair>
The difference in impedance therebetween; diff min Is recorded for historical data set->
Minimum value of, diff max Is recorded for historical data set->
Maximum value of, Δ refBase A reference baseline value offset characterizing a differential impedance value of the electrode when in contact with and not in contact with tissue, when said reference baseline value offset Δ refBase When 10% or less, Δ refBase ＝0。
10. A sensing system for indicating the degree of abutment of basket catheter electrodes as recited in claim 9, further comprising a computer system for displaying the degree of abutment, said computer system graphical user interface comprising,
the preset sticking index setting area is used for displaying the numerical value of the preset sticking index and the bar-shaped schematic block;
the electrode sticking degree schematic two-dimensional graph is characterized in that rectangular color blocks are distributed along the X-axis direction and the Y-axis direction in the electrode sticking degree schematic two-dimensional graph, and the X-axis direction refers to the number of each basket conduit; the Y-axis direction refers to the electrode number of the catheter on each side, and the gray level of the rectangular color block is in a corresponding relation with the sticking index;
the electrode position schematic diagram uses a plurality of concentric circles to represent the electrode number on each basket strip, and uses a line segment from the circle center to the outermost circle to represent each basket strip; the intersection point of the line segment and the multiple concentric circles indicates the position of the electrode on the basket bar; the area of the intersection point is in direct proportion to the attaching degree.
11. A detection apparatus of the degree of abutment, comprising a detection system for indicating the degree of abutment of an electrode of a basket catheter according to any one of claims 1 to 10, further comprising a basket catheter comprising a handle portion (201), a pusher member (202), a shaft portion (203), a moving member (209) and a distal end portion (204) on which the electrode is mounted;
the distal section (204) comprises a catheter tip of a basket arrangement comprising a basket strip (208), the basket strip (208) being caused to contract or expand by movement of a motion member (209) located at the centre of the basket; the electrodes are arranged axially along the basket bars (208) and the reference electrode is arranged on the moving member (209).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116370062A (en) * | 2023-06-07 | 2023-07-04 | 四川锦江电子医疗器械科技股份有限公司 | Catheter head end and catheter for heart mapping and ablation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116370062A (en) * | 2023-06-07 | 2023-07-04 | 四川锦江电子医疗器械科技股份有限公司 | Catheter head end and catheter for heart mapping and ablation |
| CN116370062B (en) * | 2023-06-07 | 2023-08-01 | 四川锦江电子医疗器械科技股份有限公司 | Catheter head end and catheter for heart mapping and ablation |
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