Abstract
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. Gram-negative rod Escherichia coli and the Gram-positive coccus Staphylococcus epidermidis, 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 distribution 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 of 6[Formula: see text]W of radiation at a wavelength of 0.97[Formula: see text][Formula: see text]m for 40[Formula: see text]s. Number of S. aureus and Ent. faecium colony-forming unit was reduced to 70% after same exposure. The peak temperature of bacterial suspension was [Formula: see text]C after treatment by laser with a strongly absorption coating fiber tip. Laser with a strongly absorption 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, affects bacteria.
Highlights
The incidence of urolithiasis in the world is steadily growing
The current paper shows that a diode laser with a strongly absorbing coating (SAC)
The present study clearly demonstrated that the laser with a SACber tip at 6 W output power has antibacterial e®ects against E. coli, S. epidermidis, S. aureus and Ent. faecium
Summary
Urinary stones may develop as a result of urinary tract infections. Approximately 10–15% of urinary stones are infection stones.[1] In addition, a colonized stone culture associated with a sterile urine culture was Bactericidal e®ect of continuous wave laser with SAC found in 25% of the patients.[2] Complete stone removal is the main objective of treatment. Eradication of the associated urinary tract infections is only possible after the stone has been completely removed, since stones contain bacteria and the number of bacteria on the stone surface will increase despite antibiotic therapy.[3] It was shown that removal of stone from the renal pelvis provokes pyelonephritis in 87.5% of the cases.[4] Long-term antibiotic treatment must be administered in connection with lithotripsy. New techniques for aseptic destruction of urinary stone are required
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