Laser-induced modification of the scleral collagen framework for changing its hydraulic permeabilityстатья
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Дата последнего поиска статьи во внешних источниках: 17 февраля 2021 г.
Аннотация:An action of the IR laser pulses with a wavelength of 1.56mm, moderate intensity, and various durations on a collagen framework structure and sclera tissue permeability is considered. It is shown that the temperature thresholds of collagen denatur-ation in tissues under the laser irradiation are substantially lower as compared to those under conventional homogeneous heating in a calorimeter oven. A tissue matrix modified at temperatures below the denaturation threshold is observed in images obtained by non-linear optical microscopy in the regime of second harmonic genera-tion. The modification has specific features under long-duration (with a duration longer than 1 s) and short-duration (10 – 30 ms) action: separation of a fibre bundle into groups with distorted pas-sage in the first case and bundle splitting to chaotically directed fibres in the second case. The character of the tissue change determines the coefficient of organic substance diffusion into a tissue material. After matrix amorphisation (collagen denatur-ation) or distortion of the fibre group arrangement in the collagen bundle, the diffusion coefficient falls by 10 % – 40 %, whereas after bundle splitting it increases by 25 % – 50 % as compared to the value of (3± 0.1) ́ 10–6 cm s–1, which is specific for intact tissue. The results obtained make us to assume that the specific disordering of the tissue collagen framework under the short-duration action may be used for increasing the permeability of the scleral tissue.