ABLATION METHOD OF BIOLOGICAL TISSUES AND DEVICE FOR ITS IMPLEMENTATION Russian patent published in 2019 - IPC A61B18/12 

FIELD: medicine.

SUBSTANCE: method and device for ablation of biological tissues relate to medicine. Two electrodes of the ablation device are placed in contact with the tissue surface so that the treated tissue is placed between the electrodes. Voltage is supplied to electrodes. Values of tissue impedance Z and its variation rate dZ/dt, power W and its variation rate dW/dt are calculated. Energy E is counted into load. Specified value of impedance reduction rate is maintained. Value of the total energy Et required for achieving transmurality of the tissue is evaluated when the value of impedance reaches value of 0.7–0.8 of the initial value of impedance. Maximum permissible power Wmax is evaluated when impedance value is equal to 0.7–0.8 of initial value of impedance. Switching to constant impedance maintenance mode is performed. Estimating achievement of transmurality based on establishment of power value W, greater than Wmax, or based on the amount of energy E supplied to the load, which exceeds the value of the total energy Et required for achieving transmurality of tissue, or after a predetermined time after performing transition to constant impedance maintenance mode. Device for ablating biological tissues comprises a power supply unit, an output circuit for matching the generator with a working instrument for ablation, a voltage sensor and a current sensor. Power supply unit is connected to high-frequency generator and control system. Control system includes microprocessor and display. Display is connected to control system. Voltage sensor and current sensor are connected to output circuit and connected to control system. Microprocessor is configured to calculate the tissue impedance value Z and its change rate dZ/dt, calculating the power W and the rate of change thereof dW/dt, counting the energy E supplied to the load, maintaining the given impedance reduction rate dZ/dt, determining the total energy Et required to achieve transmurality of the tissue, and the maximum allowable power Wmax, maintaining a constant level of impedance when reaching the plateau, indicating the output of transmurality, shutting down the generator based on the output of transmurance or timer.

EFFECT: higher reliability of making electrically non-conductive areas of tissue.

10 cl, 3 dwg