Optimization of Regimes of Laser Cut Biological Tissues in Surgery

10.12737/3323 ◽  
2014 ◽  
Vol 21 (1) ◽  
pp. 92-95
Author(s):  
Брехов ◽  
E. Brekhov ◽  
Плешанов ◽  
P. Pleshanov
Keyword(s):  
Laser Radiation ◽  
Laser Beam ◽  
Blood Circulation ◽  
Biological Tissues ◽  
Surgical Instruments ◽  
Mechanical Compression ◽  
Mechanical Pressure ◽  
Loss Of Coherence ◽  
Lower Loss ◽  
Different Tissues

Lasers are generating systems that implement the extreme concentration of the emitted energy in the spectrum, space and time. Heating of biological tissues by electromagnetic radiation, including powerful infrared laser radiation, can cause of their destruction: evaporation, sublimation and dissection. Blood circulation causes efficient cooling, and mechanical pressure tissueinduces intensive penetration of the laser radiation with lower loss of coherence. The special series of surgical instruments has been developed, patented and used in practical activities for 4 decades. Theinstruments allowed to reaching a mechanical compression of tissue, positioning and moving the laser beam, locally block the blood circulation, the optimal regimes of laser surgical exposure of tissues were estimated by using the real thermo-physical characteristics for different tissues.

Influence of Continuous and Pulsed Laser Radiation on Optical and Thermal Properties of Biological Tissues

2014 ◽  
Vol 59 (12) ◽  
pp. 1149-1154
Author(s):  
A.D. Mamuta ◽  
◽  
V.S. Voitsekhovich ◽  
N.M. Kachalova ◽  
L.F. Golovko ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Laser Radiation ◽  
Pulsed Laser ◽  
Biological Tissues ◽  
Pulsed Laser Radiation

scholarly journals Numerical simulation of changes in the electric properties of biological tissues under local heating by laser radiation

2021 ◽  
Vol 2090 (1) ◽  
pp. 012049
Author(s):  
N V Kovalenko ◽  
A V Smirnov ◽  
O A Ryabushkin
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
Laser Radiation ◽  
Optical Radiation ◽  
Local Heating ◽  
Biological Tissues ◽  
Electric Properties ◽  
Reliable Tool ◽  
The Mathematical Model

Abstract The mathematical model that describes the local heating of biological tissues by optical radiation is introduced. Changes of the electric properties of biological tissues in such process can be used as a reliable tool for analyzing heating and damage degrees of tissues.

scholarly journals Temperature Calibration Measurements based on Laser-Induced Phosphorescence Technique for Combustion Applications

2015 ◽  
Vol 10 (1) ◽  
Keyword(s):  
Laser Radiation ◽  
Laser Beam ◽  
Intensity Ratio ◽  
Laser Power ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Temperature Calibration ◽  
Phosphor Powder ◽  
Calibration Methods

Phosphor powder and phosphor-binder mixtures are successfully employed for temperature calibration measurements by using laser-induced phosphorescence (LIP) technique with an emphasis on higher precisions and accuracies than other non-intrusive methods. The phosphorescence intensities are used to perform these calibrations in three different strategies. The influence of laser power regular changes on particles heating and the calibration analyses is also carried out. A pulsed laser at 355 nm was used for exciting specimens of the phosphor powder as well as the phosphor-binder mixtures. The laser beam was directed onto the specimens and varied in three laser power levels (LPLs). The samples were kept in an oven with temperatures ranging from room temperature up to 1800 °C. The three strategies which are expressed in terms of non-dimensional intensity versus wavelength (NDI-W), normalised intensity (NI) and intensity ratio (IR) were used for the calibration assessments. A modified IR was compared with two different IRs. A precision of around ± (0.50-1.41)% was attained for different calibration methods. This research confirmed that these calibrations are possible using three different strategies, given high precisions and accuracies. The laser power alternations influenced the NI and do affect neither the NDI-W nor the IR curves. The laser radiation does not play any role for heating the particles of the studied powder.

Action Mechanisms of Laser Radiation in Biological Tissues

2003 ◽  
pp. 73-127 ◽  
Author(s):  
A. Roggan ◽  
U. Bindig ◽  
W. Wäsche ◽  
F. Zgoda ◽  
R. Steiner ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Biological Tissues ◽  
Action Mechanisms

Basic experiments of laser beam correction by adaptive optics microscope for the accurate manipulation of biological tissues

2017 ◽  
Author(s):  
Masayuki Hattori ◽  
Yosuke Tamada ◽  
Shin Oya ◽  
Yutaka Hayano ◽  
Yasuhiro Kamei
Keyword(s):  
Laser Beam ◽  
Adaptive Optics ◽  
Biological Tissues ◽  
Basic Experiments

Calculation of the temperature effect of laser radiation on biological tissues

2019 ◽  
Author(s):  
V. V. Chernigovskiy ◽  
S. A. Martsinukov ◽  
D. K. Kostrin ◽  
V. A. Simon
Keyword(s):  
Laser Radiation ◽  
Temperature Effect ◽  
Biological Tissues

Multiple beam scattering effects in biological tissues exposed to laser radiation

1988 ◽  
Vol 10 (2) ◽  
pp. 173-182
Author(s):  
F. Bloisi ◽  
L. Vicari ◽  
P. Cavaliere ◽  
S. De Nicola ◽  
P. Mormile ◽  
...  
Keyword(s):  
Laser Radiation ◽  
Biological Tissues ◽  
Multiple Beam ◽  
Scattering Effects ◽  
Beam Scattering

Pore formation in biological tissues under thermo-mechanical effect of laser radiation

2014 ◽  
Author(s):  
Emil Sobol ◽  
Alexander Shnirelman ◽  
Olga Baum ◽  
Ivan Sadovsky ◽  
Valerii Vinokur
Keyword(s):  
Laser Radiation ◽  
Pore Formation ◽  
Biological Tissues ◽  
Mechanical Effect

Raman Signal Enhancement in Deep Spectroscopy of Turbid Media

2007 ◽  
Vol 61 (8) ◽  
pp. 845-854 ◽  
Author(s):  
P. Matousek
Keyword(s):  
Raman Spectroscopy ◽  
Laser Radiation ◽  
Laser Beam ◽  
Near Infrared ◽  
Optical Element ◽  
Disease Diagnosis ◽  
Pharmaceutical Products ◽  
Turbid Media ◽  
Raman Signal

A new, passive method for enhancing spontaneous Raman signals for the spectroscopic investigation of turbid media is presented. The main areas to benefit are transmission Raman and spatially offset Raman spectroscopy approaches for deep probing of turbid media. The enhancement, which is typically several fold, is achieved using a multilayer dielectric optical element, such as a bandpass filter, placed within the laser beam over the sample. This element prevents loss of the photons that re-emerge from the medium at the critical point where the laser beam enters the sample, the point where major photon loss occurs. This leads to a substantial increase of the coupling of laser radiation into the sample and consequently an enhanced laser photon–medium interaction process. The method utilizes the angular dependence of dielectric optical elements on impacting photon direction with its transmission spectral profile shifting to the blue with increase in the deviation of photons away from normal incidence. This feature enables it to act as a unidirectional mirror passing a semi-collimated laser beam through unhindered from one side, and at the other side, reflecting photons emerging from the sample at random directions back into it with no restrictions to the detected Raman signal. With substantial restrictions to the spectral range, the concept can also be applied to conventional backscattering Raman spectroscopy. The use of additional reflective elements around the sample to enhance the Raman signal further is also discussed. The increased signal strength yields higher signal quality, a feature important in many applications. Potential uses include sensitive noninvasive disease diagnosis in vivo, security screening, and quality control of pharmaceutical products. The concept is also applicable in an analogous manner to other types of analytical methods such as fluorescence or near-infrared (NIR) absorption spectroscopy of turbid media or it can be used to enhance the effectiveness of the coupling of laser radiation into tissue in applications such as photodynamic therapy for cancer treatment.

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