New connection method for isolating and disinfecting intraluminal path during peritoneal dialysis solution-exchange...

Area of Science:

• Medical Microbiology
• Biomedical Engineering
• Infectious Disease Prevention

Background:

• Peritonitis remains a significant complication in peritoneal dialysis (PD).
• Contamination at the connect/disconnect site is a primary cause of PD-related peritonitis.
• Existing disinfection methods may have limitations in fully eradicating problematic microorganisms.

Purpose of the Study:

• To evaluate the efficacy of a novel microwave-assisted high-temperature moist-heat (HTMH) disinfection device.
• To assess the intraluminal disinfection performance at the connect/disconnect site of PD pathways.
• To determine the reduction of key peritonitis-causing microorganisms.

Main Methods:

• Connector pairs were inoculated with standardized microbial suspensions (S. epidermidis, P. aeruginosa, C. albicans, A. niger).
• Microwave energy was used to achieve HTMH disinfection of the intraluminal path.
• Surviving microbial populations were quantified using colony-forming unit (CFU) counts after incubation.

Main Results:

• The HTMH device achieved an 85°C solution temperature rise in 12 seconds.
• A tenfold microbial population reduction was observed in less than 3 seconds for all tested organisms.
• A 30-second cycle achieved >10^8 population reduction for bacteria/yeast and >10^7 for fungi.

Conclusions:

• The novel microwave-assisted HTMH method provides rapid and effective intraluminal disinfection of PD connectors.
• This technique demonstrates significant potential in reducing microbial load, thereby mitigating the risk of PD-associated peritonitis.
• The method is particularly promising against gram-negative bacteria and fungi, common causes of severe peritonitis.