DEVICE FOR RADIO-FREQUENCY ABLATION OF PULMONARY VESSELS Russian patent published in 2022 - IPC A61B18/12 A61B18/14 

FIELD: medicine.

SUBSTANCE: invention relates to medicine, namely to cardiovascular surgery, and concerns devices for radiofrequency ablation of pulmonary arteries for the purpose of their denervation in the treatment of secondary pulmonary hypertension in cardiac surgery patients with mitral valve disease, pulmonary embolism, atrial fibrillation, as well as for isolation orifices of the pulmonary veins in the treatment of ectopic atrial fibrillation. The device for radiofrequency ablation of pulmonary vessels contains two branches, one of which is fixed in the device-handle of the device, and the other with the possibility of parallel translational movement relative to the fixed branch to form sponges perpendicularly located at the ends of the branches, intended to place between them a section of the pulmonary vessel, open or the closed position of the device. Each of the surfaces of the jaws facing each other is made with a central section protruding along the entire length of the jaws, on the surface of which an electrode of rectangular cross-section is flush mounted along it, connected to a source of radio frequency current. In the middle of the protruding central section on the surface intended to accommodate the pulmonary vessel on each sponge, an arcuate notch is made over the entire width of the protruding central section in the section of the sponge with a length (A) from 22 mm to 60 mm, with a radius of an arc of a circle (R) from 80 mm up to 600 mm, selected from the condition of placing a section of the pulmonary vessel in the recess when the device is closed for the radiofrequency ablation procedure. Flush with the surface of the central protruding portion of each of the jaws, a second electrode of rectangular cross-section is installed, isolated from the first electrode. Both electrodes are located on a jaw length (L) from 28 mm to 70 mm. Each electrode has a width (B) of 0.2 mm to 0.5 mm and a height (H) of 2.5 mm to 3.0 mm. On the rectilinear surfaces of the protruding central section of each jaw, the electrodes are located along the surfaces parallel to each other and with a gap (C) between them from 0.5 mm to 0.6 mm, and from the boundaries of the arcuate recess with rectilinear surfaces of the protruding central section of each jaw, the electrodes are symmetrical and arcuate apart relative to the longitudinal axis of the protruding central section to its lateral edges with the formation of a gap (D) between the tops of the arcs formed by the electrodes, equal to 1.6 mm to 1.8 mm. The connection of the electrodes to the radio-frequency current source and to each other is made with the possibility of providing opposite polarity on the two electrodes of each sponge upon their activation, and the unipolar electrodes on the opposite jaws are located on their protruding central sections mirroring each other.

EFFECT: more uniform along the perimeter of the pulmonary vessel, irreversible thermal effect on its wall, a decrease in the depth of influence on the wall, in order to preserve the intimate layer of the vessel to ensure normal regulation of the reflex reaction of the vessels of the pulmonary circulation and prevent complications after circular radiofrequency ablation by ensuring uniform pressure on the vessel along its entire perimeter, as well as practically the same temperature along the perimeter of the pulmonary vessel compressed by sponges and heating its wall to a shallower depth.

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