Математичне моделювання контактного зварювання живих тканин спеціалізованими мікрохірургічними пінцетами

Microsurgery is a separate surgery section, dealing with surgical treatment of small size structures of the human body, which are often not available to the naked eye. The operating microscope and miniature surgical instruments perform all microsurgical operations. Tweezers is one of the most important tools in conducting microsurgical operations. They hold small portions of tissue and very thin sutures for tying knots. The Paton Welding Institute designed tweezers for welding tissue in microsurgery. The aims of the study are: to create a model of welding tweezers; to determine of the distribution of mechanical stresses in the tissue, depending on the compression force of the electrodes and mechanical properties of the tissue; to determine the optimal shape of the jaws and electrodes; to consider the influence of the angle between the electrodes at the welding. 3D CAD Packages SolidWorks performed analysis and modeling of electrosurgical forceps. SolidWorks allows to create design documentation and to perform mathematical modeling of welding. The paper presents a method of mathematical modeling of microsurgery tweezers, needed for their design. The electrodes should converge at an angle for secure grasping of the tissue. The angle between the electrodes reverses upon further compression, leading to expulsion of tissue. The resonant frequency of the system forceps-tissue analyzed. The electrodes glide over the tissue in opposite directions at certain resonant frequencies, which reduces the strength of the welding. Tweezers can become unstable under certain conditions. Modeling can be useful in the design of conventional tweezers