Change in the optical properties of hyaline cartilage heated by the near-IR laser radiation

Баграташвили, В.Н.; Bagratashvili, Nodar V.; Gapontsev, Valentin; Makhmutova, G. Sh.; Минаев, В. П.; Omelchenko, Alexander I.; Samartsev, I. É.; Sviridov, Аlexander P.; Sobol, Emil N.; Tsypina, S. I.

doi:10.1070/qe2001v031n06abeh001996

Cited by 15 publications

(11 citation statements)

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“…The alteration in internal stress during laser irradiation results in accelerated stress relaxation and represents a fundamental biophysical change that results in cartilage reshaping [18,23,24]. Preliminary studies using diffuse light scattering and calorimetric measurements have identified changes in cartilage tissue, thermal and optical properties that are consistent with this phase transformation hypothesis [11][12][13]15,19,20,[25][26][27][28][29][30][31][32].…”

Section: Introductionmentioning

confidence: 79%

Characterization of temperature dependent mechanical behavior of cartilage

et al. 2003

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The anisotropic mechanical behavior of cartilage was quantitatively analyzed in the transversely and longitudinally oriented specimens. Viscoelastic behavior appeared to be strongly dependent on the water content. Using empirically determined estimates of the transition zone temperature range accompanying stress relaxation, the activation energy for stress relaxation was calculated using time and temperature superposition theory and WLF equation. Further investigation of the molecular changes, which occur during laser irradiation, may assist in understanding the thermal and mechanical behavior of cartilage and how the reshaping process might to be optimized.

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Section: Introductionmentioning

confidence: 79%

Characterization of temperature dependent mechanical behavior of cartilage

et al. 2003

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“…In 1993, Sobol et al demonstrated cartilage reshaping using a laser was possible and pioneered the use of lasers for the correction of cartilaginous deformities in the head and neck [1][2][3]. Several wavelengths have since been evaluated: Diode laser (l ¼ 0.98 mm) [4], Nd:YAG laser (l ¼ 1.32 mm and l ¼ 1.44 mm) [5][6][7], Ho:YAG laser (l ¼ 2.1 mm) [8], Er:YAG laser (l ¼ 2.94 mm) [9] and CO 2 laser (l ¼ 10.6 mm) [10]. Recently, Ovchinnikov et al have performed a clinical series of 110 patients who underwent in situ laser nasal septal cartilage reshaping [11].…”

Section: Introductionmentioning

confidence: 99%

Laser cartilage reshaping in an in vivo rabbit model using a 1.54 μm Er:Glass laser

Mordon

Wang²,

Fleurisse

et al. 2004

Lasers Surg Med

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“…This was due to the fact that radiation (λ 2 gen (µ a = 0.35 cm -1 ) was absorbed less effectively than λ 1 gen (µ a = 0.85 cm -1 )). Self induced cartilage bleaching (λ 1 gen ) or darkening (λ 2 gen ) also affected laser induced heating [6]. Self induced cartilage bleaching or darkening can be explained by light scattering or spectral bandshift induced by heating and water disaggregation, respectively.…”

Section: Specific Features Of Laser Surgery Of Cartilaginous Tissue Imentioning

confidence: 99%

“…Laser correction combined with spray cooling is an effec tive method of cosmetic treatment of cartilaginous tissue. The effect of hyaline cartilage thickness on its laser induced heating was studied in [6]. Thick (h = 2 10 mm) or thin (h < 1 2 mm) cartilage was heated more effective ly using a diode laser (λ 2 gen ) or Er laser (λ 1 gen ), respectively.…”

Section: Specific Features Of Laser Surgery Of Cartilaginous Tissue Imentioning

confidence: 99%

Organic dyes in laser surgery of cartilaginous tissues

et al. 2007

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IntroductionOptical surgical technologies were extensively devel oped in the 1990s. This gave rise to laser scalpels, which are common and effective surgical instruments in modern medical centers. Tissue dissection with a laser beam is accompanied by blood coagulation at the incision site. This reduces blood losses and facilitates surgery of such blood filled organs as liver and pancreas. The use of laser scalpels reduces the time of dry field surgery, pain reac tions to surgery, and postsurgical edema. In addition, remote laser surgery and surgery using lightguide disin fects the surgical wound.Flexible fiber optic lightguides are able to transfer optical radiation virtually without losses. This made the laser scalpel an ideal instrument for laparoscopic surgery. Special puncture operations were developed in which the lightguide is applied to the pathological lesion through a thin injection needle.Lack of methods for control of the laser beam direc tion gives rise to undesirable damage to adjacent tissues. Local staining (sensitization) of the treatment zone with laser radiation absorbers provides a solution to this prob lem. The laser radiation absorbers are organic dyes. The dyes have already been used for amplification of laser radiation during welding of small blood vessels and frag ments of human organs, as well as for healing of wound surface. Radiation induced heating causes disruption of cell membranes. The dye contained in cells forms strong intercellular bonds mediated by intermolecular bonds. Similar processes are observed during laser induced ther moplasty of cartilaginous tissues.Simultaneous effects of laser induced heating and heat transfer from adjacent tissues determine the temper ature and area of heated site.The use of organic dyes in laser surgery of cartilagi nous tissues in practical medicine requires solution of a number of theoretical and practical problems of biomed ical optics, laser engineering, and organic chemistry. Use of Organic Dyes in Laser SurgeryNew methods of laser surgery include methods based on injection (application) of organic dyes to biological tissues. Virtually harmless organic dyes, such as indo cyanin green (ICG, cardiogreen), are incorporated in laser solders used for soldering fine fibers of the human body (nerves, small blood vessels, sperm ducts, etc.) [8].The use of ICG for high contrast medical imaging is promising because the spectrum of the dye contains an intense band in the IR range, where intrinsic absorption of biological tissue is small. Suitable IR diode lasers are available. The toxicity of ICG is low, and this dye is easi ly excreted from human body. The dye is adopted for medical use.The spectral absorption maximum of ICG solution λ abs max in water and bovine blood plasma is at 779 and 803 nm, respectively. The bandwidth of the spectral band is ∆λ ≈ 60 nm; extinction coefficient, ε max ≈ 2⋅10 5 liter/ mol⋅cm. Spectral fluorescence maximum of ICG solution λ fl max in water and bovine blood plasma is at 810 and 829 nm, respectively; the luminescence q...

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Change in the optical properties of hyaline cartilage heated by the near-IR laser radiation

Cited by 15 publications

References 1 publication

Characterization of temperature dependent mechanical behavior of cartilage

Characterization of temperature dependent mechanical behavior of cartilage

Laser cartilage reshaping in an in vivo rabbit model using a 1.54 μm Er:Glass laser

Organic dyes in laser surgery of cartilaginous tissues

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