Introduction: Siphons, the blind spot of infection prevention
In healthcare facilities, the fight against nosocomial infections mobilizes protocols, equipment, and training. Yet one discreet sanitary fixture is often overlooked: the siphon of the medical washbasin. Numerous scientific studies published in recent years have demonstrated that hospital washbasin siphons act as true microbiological reservoirs, involved in the persistence and spread of opportunistic bacteria, some of which are multidrug-resistant.
At Medical Process, a French designer and manufacturer of medical washbasins and hospital sanitary equipment, we integrate this reality from the design stage of our products to drastically reduce this infectious risk. In this case, some of the least expensive solutions remain the most effective.
1. Siphons as microbial reservoirs in hospital settings
The drainage networks of hospital washbasins provide ideal conditions for bacterial colonization: constant humidity, favorable temperature, and the presence of organic nutrients. Medical washbasin siphons are regularly colonized by complex bacterial biofilms that are resistant to conventional disinfectants.
These microorganisms include: Pseudomonas aeruginosa, carbapenemase-producing Klebsiella pneumoniae (KPC), ESBL Escherichia coli, and Acinetobacter baumannii. According to a study published in Clinical Infectious Diseases (2017), washbasin drains serve as reservoirs for multidrug-resistant organisms in healthcare facilities.
2. Biofilm formation and persistence in siphons
Biofilm is a polymeric extracellular matrix that enables bacterial adhesion to the internal surfaces of siphons. This structure protects microorganisms against:- Conventional chemical disinfectants
- Thermal treatments
- Immune defense mechanisms
3. Transmission via aerosols: an underestimated risk
Splashing generated during the use of hospital washbasins can disperse microorganisms present in the siphon into the immediate environment. A study from the American Journal of Infection Control (2009) showed that contaminated sinks can generate aerosols capable of spreading pathogens onto surrounding surfaces.
This indirect transmission mechanism is particularly concerning in care areas where immunocompromised patients may be exposed to airborne pathogens originating from the water network.
Good to know: Medical Process designs its medical washbasins in stainless steel with an optimized basin geometry to minimize splashing and facilitate siphon decontamination.
4. Specific implications in hospital settings
Contaminated siphons pose an increased risk in certain units with high infectious vulnerability:- Intensive care units (ICU / resuscitation)
- Hematology and oncology departments
- Transplant and graft units
- Operating theaters and sterile areas
In these environments, the slightest source of environmental contamination can trigger nosocomial outbreaks of multidrug-resistant bacteria (MDR), with serious consequences for patients.
5. Criteria for selecting a medical washbasin that minimizes siphon risk
To effectively limit the infectious risk associated with siphons, medical sanitary equipment must meet several criteria:
- Removable siphon for thorough cleaning and regular decontamination
- Non-porous materials (AISI 304 or 316L stainless steel) reducing bacterial adhesion
- Geometry free of dead zones or inaccessible recesses
- Compatibility with disinfectants approved for hospital use
- Easy siphon replacement without specific tools
Medical Process medical washbasins, manufactured in medical-grade stainless steel and designed in accordance with EN standards and the recommendations of the HCSP and SF2H, incorporate these principles to offer hospital sanitary equipment that meets the requirements of healthcare-associated infection (HAI) prevention.
Conclusion & Solution: A cost-effective solution proposed by Medical Process
Appropriate design of sanitary equipment, combined with rigorous maintenance protocols, is essential to control this vector of bacterial transmission.
Medical Process supports healthcare facilities in selecting medical washbasins and hospital sanitary equipment suited to the constraints of infection prevention. The link above details a simple solution consisting of installing a basic manual valve at the outlet of the siphon toward the wastewater line. This valve allows the siphon to be isolated so that disinfectant can be poured directly into the medical washbasin, thereby disinfecting both the siphonand the drain outlet — with no disassembly, no handling.
Associated keywords: hospital siphon decontamination, medical washbasin, nosocomial infection prevention, hospital siphon biofilm, medical sanitary equipment, multidrug-resistant bacteria hospital, Medical Process washbasin, microbiological water safety hospital
Sources: Clinical Infectious Diseases, 2017 — American Journal of Infection Control, 2009 — Nature Reviews Microbiology