Endocardium three-dimension navigation system

Abstract

The invention discloses an endocardial three-dimensional navigation system and a navigation method, which improve the catheter positioning technology in the cavity, so that the structure is simple and the navigation precision is high. The technical scheme is as follows: the system comprises: an excitation device, three pairs of excitation electrodes, a catheter position signal acquisition device, a respiratory impedance adjustment device, and a cardiac cavity mechanical shape synchronization device, wherein the digital control logic and the constant current generation module in the excitation device simultaneously generate Three different continuous sine waves below 10KHz, the catheter position signal acquisition device includes catheter, positioning amplifier, analog-to-digital converter, digital demodulator and coordinate conversion module, the respiratory impedance adjustment device includes body surface electric field signal acquisition electrode, positioning Amplifier, Analog-to-Digital Converter, Respiratory Data Extraction Module, Respiratory Calibration Module. The invention is applied to the field of catheter interventional surgery in cardiology department.

Description

technical field [0001] The invention relates to an operation navigation system, in particular to a catheter navigation system in the catheter intervention operation of the Department of Cardiology. Background technique [0002] In cardiology catheter interventional surgery, it is necessary to navigate the catheter through navigation technology. The catheter navigation technology is briefly described as follows: a three-dimensional cardiac cavity model is constructed by obtaining the position signal of the catheter on the endocardium, and the signal position of the catheter is observed on the three-dimensional cardiac cavity model to obtain the actual position of the catheter on the endocardium. The doctor's operation during the operation. [0003] The existing three-dimensional endocardial navigation method generally includes the following steps: three pairs of excitation electrodes with orthogonal spatial positions are placed on the body surface, and the excitation electro...

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Problems solved by technology

The disadvantages of this application are: (a) for the processing technology of respiratory waves, a time-division system is used to collect respiratory waveform data. Since the excitation and collection must be carried out between mutually non-orthogonal electrode pairs in the same plane, the electrodes that can be collected The combination mode is limited, so the extracted breathing-related information is not rich enough, and the circuit structure is complicated; (b) a linear weighting method is used to compensate the influence of the breathing waveform, the model is simple, and the calculation error is large; (c) the form of current pulse is used External excitation is generated, which is easily affected by the contact capacitance of the electrode system, and the accuracy of the collected respiratory wave data processing algorithm is limited

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