Abstract: A cryoprobe having a working tip formed of two coaxial flexible internal and external tubular lines, wherein the cross-section diameter of the internal line is substantially smaller than the cross-section diameter of the external line, and the length is slightly smaller than the length of the external line. The external line ends with a top closing the working tip of the cryoprobe, while the end of the internal line is open, and there are openings evenly distributed across the circumference on at least half of the section of the internal line. On the section from the handle to the end located under the top, a resistance wire is spirally wound on the internal line, wherein the distance between the wall of the external line and the wall of the internal line is larger than the diameter of the resistance wire. On the external line, no further from the top located on the top of the working tip than ? of the length thereof, there is a temperature sensor connected to the handle by a power line.

Abstract: The electrophysiological diagnostic catheter obtains an endomyocardial biopsy of heart tissues. The catheter includes a manipulation handgrip, main channel, distal ring and diagnostic rings connected with electrical connections. There is a centrally located, open internal channel, wherein inlet/outlet of internal channel is located in the distal ring, or is guided and monitored using a system for 3D electroanatomical mapping.