Laser welding of biological tissue: experimental studies in ophthalmology

2006 ◽  
Author(s):  
Roberto Pini ◽  
Francesca Rossi ◽  
Luca Menabuoni
Keyword(s):  
Laser Welding ◽  
Biological Tissue ◽  
Experimental Studies

scholarly journals Fuzzy C-Means Partition Cluster Analysis and Validation Studies on a Subset of CiteScore Dataset

2019 ◽  
Vol 8 (9S3) ◽  
pp. 105-107
Keyword(s):  
Cluster Analysis ◽  
Laser Welding ◽  
Validation Studies ◽  
Welded Joint ◽  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulsed Laser Welding ◽  
Fuzzy C Means

The article deals with promising areas of application of pulsed laser welding for products made of silver-based alloys. The results of experimental studies to improve the quality of the welded joint and the efficiency of the welding process with the use of activated absorption additives are presented

scholarly journals Phantom to control the thermal ablation process

2021 ◽  
Vol 9 (1) ◽  
pp. 73-78
Author(s):  
V. N. Makarov ◽  
D. V. Shmeliova ◽  
N. A. Boos
Keyword(s):  
Radio Frequency ◽  
Biological Tissue ◽  
Plant Tissue ◽  
Thermal Field ◽  
Experimental Studies ◽  
Thermal Exposure ◽  
Physicochemical Characteristics ◽  
Human Organism ◽  
Thermal Imager ◽  
Experimental Stand

Medical equipment, due to its specificity, requires precise adjustment and testing. Therefore, before direct exposure to a human organism, the equipment is tested on specialized mock-ups of human  tissue – phantoms. The physicochemical characteristics of phantoms should be close to the characteristics of the selected biological tissue. Depending on the task at hand, the design of the phantom itself and its properties will be different. The aim of this work is to create a phantom that clearly demonstrates the distribution of the thermal field in the volume during heating while maintaining the heating pattern for several hours. The studies were carried out on an experimental stand, which contained a device for radio frequency ablation of tissues “METATOM-3” with a set of electrodes, a thermal imager, and a tripod for fixing the electrodes. Animal tissue (pig liver) and plant tissue (potatoes) were used as biological tissue simulators. The most suitable imitator turned out to be potatoes, because the electrophysical parameters of potatoes are close to those of the human parenchymal organs. Thermal exposure of potatoes at 58–62°C leads to changes in the starch characteristics: the appearance of a fine-crystalline structure filled with water from the surrounding space is observed. As a result, volumetric changes in the structure of plant tissue appear at the place of heating, which makes it possible to evaluate the results of thermal exposure. To form a clearer thermogram, part of the potato is cut off. In general, potatoes have a narrow temperature range of reaction in the range of 58–62°C, which conveniently coincides with the temperature of cell death (60°C). The experiments carried out show the effectiveness of such a phantom. The obtained pictures of thermal  field are reliable and persist for several hours. Experimental studies of various singleelectrode and multi-electrode systems provide ground for recommending this phantom for the practice of developing radio-frequency and microwave ablation systems.

scholarly journals Improving the Quality of Welded Joints in Laser Welding of Silver Products

2019 ◽  
Vol 8 (9S3) ◽  
pp. 102-104
Keyword(s):  
Laser Welding ◽  
Welded Joints ◽  
Experimental Studies ◽  
Pulsed Laser ◽  
Welding Process ◽  
Pulsed Laser Welding

The article deals with promising areas of application of pulsed laser welding for products made of silver-based alloys. The results of experimental studies on the choice of modes of pumping, defocusing to improve the quality of the weld and the efficiency of the welding process.

New laser technologies in surgery, obstetrics and gynecology

1999 ◽  
Vol 80 (2) ◽  
pp. 88-90
Author(s):  
D. М. Krasilnikov ◽  
I. F. Fatkullin ◽  
O. Y. Karpukhin
Keyword(s):  
Caesarean Section ◽  
Laser Welding ◽  
Abdominal Cavity ◽  
Experimental Studies ◽  
Obstetrics And Gynecology ◽  
Ultraviolet Laser ◽  
Tissue Welding ◽  
Laser Technologies ◽  
Frequency Of Occurence

The ultraviolet laser spectrofluorimetry method for the diagnosis of urgent surgical disrases of abdominal cavity organs and the determination of their vitality is determined. The experimental studies showed the possibility of the use of Nd: YAG-Iaser for sutureless connection of uterus wound edges and geometric recovery of serous integument on the basis of tissue welding. The use of the laser welding suture in the clinic made it possible to decrease by a factor of three the frequency of occurence of pyo-inflammatory complications after caesarean section and uterus supravaginal amputation

Numerical and experimental studies on the effect of varied beam diameter, average power and pulse energy in Nd: YAG laser welding of Ti6Al4V

2019 ◽  
Vol 101 ◽  
pp. 180-188 ◽  
Author(s):  
Dezhi Jiang ◽  
Ali Sulaiman Alsagri ◽  
Mohammad Akbari ◽  
Masoud Afrand ◽  
Abdulrahman A. Alrobaian
Keyword(s):  
Laser Welding ◽  
Pulse Energy ◽  
Average Power ◽  
Experimental Studies ◽  
Beam Diameter ◽  
Yag Laser

Numerical and experimental studies on the effect of varied pulse energy in Nd:YAG laser welding of Monel 400 sheets

2018 ◽  
Vol 93 ◽  
pp. 184-191 ◽  
Author(s):  
G. Shanthos Kumar ◽  
S. Saravanan ◽  
R. Vetriselvan ◽  
K. Raghukandan
Keyword(s):  
Laser Welding ◽  
Pulse Energy ◽  
Nd:Yag Laser ◽  
Experimental Studies ◽  
Monel 400
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