Three-dimensional positioning method for multi-electrode catheter and method of same

Abstract

The invention relates to the field of multi-electrode catheter positioning and especially relates to a three-dimensional positioning method for a multi-electrode catheter. The method comprises the steps that (A) multiple excitation electrodes are adhered on the peripheral body surface of a monitored tissue, multiple reference electrodes are disposed on the excitation electrodes or beside the excitation electrodes, and magnetic positioning sensors are disposed on the reference electrodes; (B) electric field signals between catheter electrodes and the reference electrodes are collected in an electric field, so distance data can be obtained; (C) position information of the magnetic positioning sensors is collected, so position information of the reference electrodes could be obtained; (D) positioning information of each catheter electrode is obtained according to the distance data and the position information of the reference electrodes; and (E) a real-time three-dimensional model of the catheter is established according to the position information of the catheter electrodes. The invention aims to provide the three-dimensional positioning method for the multi-electrode catheter, wherein the catheter positioning cost is reduced; distortion of the three-dimensional model is avoided; all the catheter electrodes on the multi-electrode catheter could be positioned; processing technologies are simple; and positioning accuracy is high. The invention also discloses a corresponding positioning device.

Description

technical field [0001] The invention relates to the field of multi-electrode catheter positioning, in particular to a multi-electrode catheter three-dimensional positioning method, and also discloses a corresponding device. Background technique [0002] Ablation therapy through a catheter is currently a mainstream treatment method, and a multi-electrode catheter is one of the catheters, which can be used for mapping or ablation, but when we use it, we need to position the multi-electrode catheter to better assist in the judgment The relationship between the position of the catheter and the tissue, and the operation of the auxiliary catheter; [0003] There are three traditional technical methods: [0004] One is to establish mutually orthogonal electric fields through three pairs of orthogonally pasted excitation electrodes, set up an internal reference electrode, collect the electric field information between the catheter electrode and the reference electrode, and use it a...

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Problems solved by technology

[0004] One is to establish mutually orthogonal electric fields through three pairs of orthogonally pasted excitation electrodes, set up an internal reference electrode, collect the electric field information between the catheter electrode and the reference electrode, and use it as the displacement in the orthogonal coordinate system after coefficient transformation , and then use the reference electrode as the origin to calculate the relative position. This method requires the excitation electrode to be applied completely orthogonally. However, in practical applications, it is difficult to achieve true orthogonality due to the influence of the body contour. The calculated position is obliquely stretched, resulting in positioning The shape of the catheter and the shape of the constructed model are distorted;

[0005] The second is to emit a low-frequency magnetic field through several excitation coils. One or several magnetic sensor coils are embedded inside the catheter to collect induction signals within the range of the magnetic field and calculate the position of the catheter. This method is accurate in positioning, but is limited by the size of the sensor and the processing technology. , only a limited number of sensors can be installed in the catheter, and all catheter electrodes cannot be located, and further, the entire catheter shape calculated by local electrodes is deviated;

[0006] The third is to measure the impedance between the catheter electrode in the body and multiple body surface references with the assistance of a magnetic field, and calculate the positions of multiple electrodes on the catheter. At the same time, install a magnetic sensor inside the catheter to determine the physical position of individual electrodes, and correct the positions of multiple electrodes through individual positions. This method also requires a magnetic sensor to be installed in the catheter, and the processing technology is complex. At the same time, the method of directly collecting the impedance of the body and the body surface is affected by factors such as the degree of contact between the catheter electrode and the tissue, and the change in the contact between the body surface reference electrode and the skin. This method corrects the position of all catheter electrodes through individual magnetic positions, and the positioning accuracy is limited by point-to-point

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