The bactericidal effect of laser radiation with a quartz fiber-based transmission system with a strong absorption coating converter against bacteria associated with urological stones has been studied.Gr am-negative ro...The bactericidal effect of laser radiation with a quartz fiber-based transmission system with a strong absorption coating converter against bacteria associated with urological stones has been studied.Gr am-negative rod Escherichia coli and the Gram-positive coccus Staphylococcus epi-dermidis,Staphylococcus aureus,Enterococcus faecalis and Enterococcus faecium were used in this study.Each bacterial species was treated by continuous-wave near infrared laser coupled with bare fiber tip or strongly absorption coating fiber tip.After treatment,the temperature of bacterial suspension was measured.In addition,the temperature dist ribution was analyzed.It has been shown that using laser with a strongly absorption coating fiber tip results in significant bactericidal effect.The decrease of the amount of E.coli and S.epidermidis was 100%after treatment with an output power of6 W of radiation at a wavelength of 0.97 pum for 40s.Number of S.aureus and Ent.facium colony-forming unit was reduced to 70%after same exposure.The peak temperature of bacterial suspension was 86℃ after treatment by laser with a strongly absorption coating fiber tip.Laser with a strongly absorpt ion coating fiber tip provides large scale hydrodynamic flows directed away from the fiber tip.The laser with a strongly absorption coating fiber tip has bactericidal effect.The main role is associated with the effect of high temperature,which,in the form of flow in a liquid medium,afects bacteria.展开更多
In this paper,we consider a method of laser resection using the silica glass core from which the cladding layer has been removed as the cutting part of a laser scalpel.An absorbing layer coating the silica fiber tip m...In this paper,we consider a method of laser resection using the silica glass core from which the cladding layer has been removed as the cutting part of a laser scalpel.An absorbing layer coating the silica fiber tip markedly alters its biotissue cutting character istics.The results of histological studies of skin after exposure to a laser scalpel with and without a strongly absorbing coating(SAC)at a wavelength of 097μm show that resection using a coated scalpel is more sparing.When an uncoated scalpel was used,skin injury was more apparent in both its surface spread and the depth of structural damage,resulting in poorer tissue regeneration.展开更多
基金Russian Science Foundation Grant No.14-15-00840Pstudying the laser-induced hydrodynamic processes was partly supported by Russian Foundation for Basic Research Grant No.17-02-00832.
文摘The bactericidal effect of laser radiation with a quartz fiber-based transmission system with a strong absorption coating converter against bacteria associated with urological stones has been studied.Gr am-negative rod Escherichia coli and the Gram-positive coccus Staphylococcus epi-dermidis,Staphylococcus aureus,Enterococcus faecalis and Enterococcus faecium were used in this study.Each bacterial species was treated by continuous-wave near infrared laser coupled with bare fiber tip or strongly absorption coating fiber tip.After treatment,the temperature of bacterial suspension was measured.In addition,the temperature dist ribution was analyzed.It has been shown that using laser with a strongly absorption coating fiber tip results in significant bactericidal effect.The decrease of the amount of E.coli and S.epidermidis was 100%after treatment with an output power of6 W of radiation at a wavelength of 0.97 pum for 40s.Number of S.aureus and Ent.facium colony-forming unit was reduced to 70%after same exposure.The peak temperature of bacterial suspension was 86℃ after treatment by laser with a strongly absorption coating fiber tip.Laser with a strongly absorpt ion coating fiber tip provides large scale hydrodynamic flows directed away from the fiber tip.The laser with a strongly absorption coating fiber tip has bactericidal effect.The main role is associated with the effect of high temperature,which,in the form of flow in a liquid medium,afects bacteria.
基金supported by the Russian Science Foundation"The Use of Laser Induced Nonequilibrium Processes in Medical Technologies"No.14-15-00840 dated 20 May 2014.
文摘In this paper,we consider a method of laser resection using the silica glass core from which the cladding layer has been removed as the cutting part of a laser scalpel.An absorbing layer coating the silica fiber tip markedly alters its biotissue cutting character istics.The results of histological studies of skin after exposure to a laser scalpel with and without a strongly absorbing coating(SAC)at a wavelength of 097μm show that resection using a coated scalpel is more sparing.When an uncoated scalpel was used,skin injury was more apparent in both its surface spread and the depth of structural damage,resulting in poorer tissue regeneration.