Ms. Irina B. Rimshan Profile

Irina B. Rimshan

at MIET

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Proceedings Article | 21 April 2016 Paper

The tensile strength characteristics study of the laser welds of biological tissue using the nanocomposite solder

I. Rimshan, D. Ryabkin, M. Savelyev, N. Zhurbina, I. Pyanov, E. Eganova, A. Pavlov, V. Podgaetsky, L. Ichkitidze, S. Selishchev, A. Gerasimenko

Proceedings Volume 9917, 99170I (2016) https://doi.org/10.1117/12.2229748

KEYWORDS: Laser welding, Laser tissue interaction, Tissues, Composites, Radiation effects, Nanocomposites, Lasers, Atomic force microscopy, Tissue optics, Head

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Laser welding device for biological tissue has been developed. The main device parts are the radiation system and adaptive thermal stabilization system of welding area. Adaptive thermal stabilization system provided the relation between the laser radiation intensity and the weld temperature. Using atomic force microscopy the structure of composite which is formed by the radiation of laser solder based on aqua- albuminous dispersion of multi-walled carbon nanotubes was investigated. AFM topograms nanocomposite solder are mainly defined by the presence of pores in the samples. In generally, the surface structure of composite is influenced by the time, laser radiation power and MWCNT concentration. Average size of backbone nanoelements not exceeded 500 nm. Bulk density of nanoelements was in the range 10⁶-10⁸ sm^-3. The data of welding temperature maintained during the laser welding process and the corresponding tensile strength values were obtained. Maximum tensile strength of the suture was reached in the range 50-55°C. This temperature and the pointwise laser welding technology (point area ~ 2.5mm) allows avoiding thermal necrosis of healthy section of biological tissue and provided reliable bonding construction of weld join. In despite of the fact that tensile strength values of the samples are in the range of 15% in comparison with unbroken strips of pigskin leather. This situation corresponds to the initial stage of the dissected tissue connection with a view to further increasing of the joint strength of tissues with the recovery of tissue structure; thereby achieved ratio is enough for a medical practice in certain cases.

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