Method for biological tissue temperature measuring in the area of laser radiation exposure with a small size beam profile during laser welding

2018 ◽  
Author(s):  
Dmitry I. Ryabkin
Keyword(s):  
Laser Radiation ◽  
Laser Welding ◽  
Radiation Exposure ◽  
Biological Tissue ◽  
Beam Profile ◽  
Tissue Temperature ◽  
Temperature Measuring

Scattering and thermal lensing of 212-µm laser radiation in biological tissue

2001 ◽  
Vol 40 (13) ◽  
pp. 2216 ◽  
Author(s):  
Michael Ith ◽  
Martin Frenz ◽  
Heinz P. Weber
Keyword(s):  
Laser Radiation ◽  
Biological Tissue ◽  
Thermal Lensing

A refined diffusion model of the interaction of laser radiation with biological tissue

2007 ◽  
Vol 102 (5) ◽  
pp. 771-776 ◽  
Author(s):  
S. A. Tereshchenko ◽  
A. A. Danilov ◽  
V. M. Podgaetsky
Keyword(s):  
Laser Radiation ◽  
Diffusion Model ◽  
Biological Tissue

Beam propagation measurements of holmium laser radiation in biological tissue

1996 ◽  
Author(s):  
Michael Ith ◽  
Valerio Romano ◽  
Martin Frenz ◽  
Heinz P. Weber
Keyword(s):  
Laser Radiation ◽  
Biological Tissue ◽  
Beam Propagation ◽  
Holmium Laser

Thermal-Electric Finite Element Analysis of Electrosurgical Cautery Process

2007 ◽  
Author(s):  
Robert E. Dodde ◽  
Scott F. Miller ◽  
Albert J. Shih ◽  
James D. Geiger
Keyword(s):  
Heat Transfer ◽  
Electrical Conductivity ◽  
Finite Element ◽  
Biological Tissue ◽  
Tissue Temperature ◽  
Temperature Dependent ◽  
Element Analysis ◽  
Temperature Dependent Thermal Conductivity ◽  
Insight Into ◽  
Good Agreement

Cautery is a process to coagulate tissues and seal blood vessels using the heat. In this study, finite element modeling (FEM) was performed to analyze temperature distribution in biological tissue subject to cautery electrosurgical technique. FEM can provide detailed insight into the heat transfer in biological tissue to reduce the collateral thermal damage and improve the safety of cautery surgical procedure. A coupled thermal-electric FEM module was applied with temperature-dependent electrical and thermal properties for the tissue. Tissue temperature was measured at different locations during the electrosurgical experiments and compared to FEM results with good agreement. The temperature-dependent electrical conductivity has demonstrated to be critical. In comparison, the temperature-dependent thermal conductivity does not impact heat transfer as much as the electrical conductivity. FEM results show that the thermal effects can be varied with the electrode geometry that focuses the current density at the midline of the instrument profile.

scholarly journals The Effect of Laser Irradiation on Reparative Osteogenesis

2018 ◽  
Vol 1 (2) ◽  
pp. 10-19
Author(s):  
Yu. М. Iryanov ◽  
N. A. Kiryanov
Keyword(s):  
Laser Radiation ◽  
Radiation Exposure ◽  
Bone Regeneration ◽  
Laser Irradiation ◽  
Light And Electron Microscopy ◽  
Infrared Laser ◽  
Control Group ◽  
X Ray ◽  
Low Intensity ◽  
The Impact

Introduction: The use of non-medicinal facilities for correcting processes in various pathological conditions is one of the most urgent problems of modern medicine. Purpose of the Work: To study the effect of low-intensity infrared laser radiation on reparative bone formation and angiogenesis in bone regeneration which is formed in treatment of fractures under conditions of transosseous osteosynthesis. Material and Methods: A tibia fracture was modeled experimentally in rats in the control and experimental groups. Reposition and fixation of fragments were performed. The fracture zone in the experimental group animals was exposed to the impact of pulsed infrared laser irradiation of low intensity. Animals from the control group underwent the impact simulation. The operated bones were investigated using the methods of X-ray, light and electron microscopy, X-ray electron probe microanalysis. Results: It was established that laser radiation exposure sessions activated fibrillogenesis and angiogenesis, accelerated compacting of newly formed bone tissue and increased its maturity while primary fracture healing occurred. Prolonged capillary dilatation and endothelium-dependent vasodilation, intensive capillarogenesis were noted after sessions of laser therapy in bone regeneration. Endothelial outgrowth was formed in the lumen of the vessels forming capillary buds that propagate along the “mother” vessels (endovascular capillarogenesis). Conclusion: The data obtained revealed a possible mechanism of laser radiation exposure at the level of a whole organism and proved the effectiveness of its application in clinical practice at the early stages of patient rehabilitation under conditions of transosseous osteosynthesis.

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