Radio frequency adjustable phase difference power amplifier circuit realizing linear ablation

Abstract

The invention belongs to the technical field of medical electronics, and particularly relates to a radio frequency adjustable phase difference power amplifier circuit realizing linear ablation. The structure of the circuit comprises a phase control unit, a radio frequency amplitude control unit, a radio frequency resonance and filtering circuit, and an impedance matching network. Due to adoption of the impedance matching network, changing myocardial impedance in ablation is equivalent within a rated load range of the circuit, so that the circuit interior loss is reduced, and output frequency is stabilized; due to adoption of a soft-switching technology, zero voltage opening or zero voltage derivative opening of an electronic switching tube is realized, so that switching loss is lowered, and the working efficiency is improved. Through adoption of the circuit, the defect that continuous ablation lesions are hard to form in a conventional point-by-point dispersing radio frequency ablation technology is overcome, and continuous linear ablation effect is produced through adjustment of phase difference of radio frequency output voltages of adjacent ablation electrodes, so that continuous linear ablation of myocardial tissue is realized.

Description

technical field [0001] The invention belongs to the technical field of medical electronics, and in particular relates to an adjustable radio frequency phase difference power amplifying circuit for realizing linear ablation, which can be applied to heart radio frequency ablation equipment to realize the effect of continuous linear ablation of myocardium. Background technique [0002] Atrial fibrillation is the most common arrhythmia in clinical practice. Its itself and its complications significantly increase the incidence of stroke and mortality in patients. Studies have shown that the ectopic excitatory focus in the pulmonary vein muscle sleeve is an important source of the occurrence and maintenance of atrial fibrillation, so isolating the abnormal excitation conduction path between the pulmonary vein and the atrium is one of the effective methods for the treatment of atrial fibrillation. At present, radiofrequency ablation is the most effective way to complete pulmona...

AI Technical Summary

Problems solved by technology

Due to the point-by-point discrete ablation, it is difficult to form a continuous ablation injury between the two ablation targets, which sometimes results in incomplete isolation of the circumpulmonary vein and residual abnormal conduction pathways, resulting in a decrease in the success rate of treatment of atrial fibrillation

[0004] The existing cardiac radiofrequency ablation power amplifier circuit has a small rated load range. When the myocardial impedance changes during the ablation process, the radiofrequency frequency drift is unstable and the internal power consumption increases

[0005] The existing cardiac radiofrequency ablation power amplifier circuit usually adopts the topology of radio frequency signal generator and power amplifier circuit. The whole circuit works in linear amplification mode, and its switching loss is obvious, which requires a lot of heat dissipation, which increases the volume of the whole circuit

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