Surgical needle microstructure effect on the operated tissue

The aim of research was to study the effect of the features of the microstructure of the surface of various surgical needles on the state of the sutured biological tissues and the timing of their subsequent regeneration. To study the regenerative features of tissues, various operations were performed in dogs and cats. A Hitachi TM-1000 scanning electron microscope was used to analyze the microstructure of the surface of the tip of surgical needles. Scanning the surface of the tip of a curved cutting surgical needle with a spring-loaded eye, which was used, revealed the bending of its tip to the inner side of the needle, as well as a defect in the form of three successive fractures with a metal-free area. Discovered microroughnesses on the surface of a curved stabbing surgical needle with a spring-loaded eye can lead to damage in the puncture canal of vessels or even nerve endings and the formation of microflaps, where tissue trophism is disturbed. The reduction of inflammatory processes and the healing of surgical wounds occurred faster in animals after working with surgical needles with a pring-loaded eye, which were used for the first time, than after using surgical needles with a spring-loaded eye, which were used more than once. In some cases, the use of surgical needles with similar defects provoked in animals the formation of a fibrinous-leukocyte scab at the sites of puncture and from the inside puncture, and sometimes between the edges of surgical wounds. The study of the surface of surgical needles with a spring-loaded eye made it possible to reveal unimaged defects, which could be one of the causes of wound healing in some animals by secondary intention.