MoveoSiphon ST24

Prevention of nosocomial infections

The MoveoSiphon ST24 is a CE-certified disinfection system for sink drains in clinical sanitary areas. Its continuous and fully automatic disinfection process prevents the production of infectious bio-aerosols and thus the transfer of pathogens from the wash basin to the patient.

In the process the following functional processes interact:

  • Continuous physical-thermal disinfection

  • Electromechanical vibration cleaning of the inside walls of the siphon

MoveoSiphon ST24
Standard siphon MoveoSiphon
Bacterial content Sink drain 105-1010 CFU/ml bacteria, of which
103-106 CFU/ml gram-negative rods
0 – 500 (max. 103) CFU/ml
Biofilm formation Starts after a few days Is prevented completely and permanently
Emission into environment following water inflow Up to 439 CFU/1000 l air No detectable emissions
Patient colonisation rates 20 – 40 % 5 – 10 %

Bacterial contamination and proliferation in seal water of wash basin processes

Without disinfection Chemical disinfection / biocide treatment Disinfecting / cleaning with MoveoSiphon
Effect
Continuous increase in the live bacteria content (CFU/ml) in the sealing liquid of the odour trap

  • Introduction of bacteria, e.g. during washing and rinsing processes,
  • retrograde germination of the sealing liquid from the drain line,
  • Odour trap offers the ideal requirements for fast germination of the micro-organisms,
  • Very fast biofi lm generation with extremely high bacteria concentrations.
Effect
Discontinuous bacteria reduction in the sealing liquid of the odour trap (usually 5 log-steps)

  • Recontamination of the sealing liquid as a result of the biofi lm not having been removed or fully removed,
  • Long-term biofi lm formation is typically not prevented,
  • The development of tolerance and resistance against disinfectant is possible in long-term applications.
Effect
Continuous, maximum bacteria reduction in the entire odour trap at temperatures of ~85°C (7 log-steps in 30 minutes).

  • Immediate and full effect after the fi rst disinfection cycle,
  • Long-term biofi lm generation is fully prevented (assisted by the vibration cleaning),
  • The development of resistance against sonothermal disinfection is not possible
If a contaminated odour trap is replaced with a factory-new standard siphon, what one can observe after only a few days is again a biofi lm generation and a live bacteria count in the sealing liquid that is equivalent to that of the replaced siphon. After each biocide treatment, recontamination occurs after just a few hours as a result of:

  • Proper introduction of bacteria into the odour trap due to washing and rinsing
  • Release of pathogens from the biofi lm, in part with an increased tolerance against disinfectant
  • „Revival“ of bacteria from the VBNC state*

The chemical disinfectant only reduces the bacteria count in the siphon temporarily and must therefore be repeated on a regular basis.

No new or re-germination

  • All vegetative bacteria that accumulate in the odour trap are killed by heat within 30 minutes.
  • No tolerance development.
  • No additional personnel and time effort.

*VBNC = viable but not culturable, state of reduced metabolic activity as response to stress (e.g. malnutrition, disinfection, low temperature), under more
favourable environmental conditions, bacteria may return to full viability and infectivity. 3

Bacteria in the siphon and formation of infectious bioaerosoles

The bacteria count development in the standard siphon without disinfection is equivalent to a growth curve

The bacteria count development in the standard siphon with chemical disinfection/biocid treatment is equivalent to a sawtooth wave.

The bacteria count development in the MoveoSiphon with sonothermal disinfection is equivalent to a steep reduction curve with persistent curve progression from 0 to max. 103 C FU/ml.

After a few days (no more than 2-3 weeks), the bacteria count in the sealing liquid of the new, untreated odour trap has exceeded the critical volume (103 CFU/ml). Despite proper use of the washing station, infectious bioaersols develop.

  • The washing station is potentially infectious and despite disinfecting the surface daily, it is hygienically unsafe.
The critical bacteria count for the bioaerosol generation (103 CFU/ml) is again exceeded after a short period of time and the bacteria count may even be higher than the original bacteria count of the previous disinfection if disinfectant-tolerant bacteria are selected.

  • There is only a temporary safety with regard to preventing infectious bioaersols immediately after chemically disinfecting the washing station when it is used properly.
As a result of the continuous disinfecting and cleaning process, the critical bacteria count for the bioaersol generation permanently drops below 103 CFU/ml. Thus, the aerosoles formed at the washing
station are not infectious.

  • If surface disinfection is correctly performed daily, the washing station is hygienically safe.

Only correct siphon testing leads to conclusive results

Take samples from the sealing fluid, because:

  • Bacteria that temporarily adhere to the interior walls of the drain valve are irrelevant for the emission from the odour trap and the epidemiological success of the disinfecting measures.
  • There is no direct dependency between the number of emitted microorganisms and the live bacteria count of the sealing liquid.

Take samples using a sterile disposable pipette that is dipped into the sealing liquid directly without touching the washbasin and drain.

Take controlled samples – do not test immediately after washing hands or eliminating waste to allow the disinfection to work.

The problem zone

Sink drains under wash basins in clinics and hospitals are open pathogen reservoirs and sources for emitting bacteria.

They contain on average 105-1010 CFU/ml of bacteria, including 103-106 CFU/ml of gram-negative rods.

Water flowing into the sink drain produces aerosols on the surface of the seal water which can emit the bacteria up to a distance of 1.5 metres around the siphon.

In case of bacterial contamination of the seal water of >105 CFU/ml so many micro-organisms are carried into the air in the room that a measureable transmission of bacteria from the seal water to the hands of patients or staff takes place.

Numerous clinical investigations prove: conventional sink drains do not fulfi l the high hygiene standards needed in invasive intensive care.

The MoveoSiphon operating function

The thermo disinfection carried out by the MoveoSiphon fulfils at least the standards of the technical process of pasteurization by means of heating (10 to 15 seconds at 85°C). In the process the unit heats up to the set temperature (85°C) and slowly cools down while the subsequent vibration cleaning takes place. Once the minimum set temperature has been reached (75°C), the heating process and thus the disinfection cleaning cycle recommences once again. If no interruption is caused by additional water inflow, then the entire process is completed after 5-6 cycles in a period of approximately one hour and the MoveoSiphon switches into standby mode until water flows in again.

Good reasons for using the MoveoSiphon ST24

  • The continuous disinfection of the siphon is carried out without using chemicals. You are doing something not only for the benefit of your patients, but also for the environment.

  • The MoveoSiphon disinfects the seal water in sink drains continuously and automatically by means of thermal disinfection.

  • The electromechanical cleaning of the inside walls of the siphon prevents the development of biofilms.

  • MoveoSiphon achieves a 7-log stage reduction in bacteria. The bacteria in the siphon water are reduced by 99.99999%.

  • Thanks to the unique operating principle, the bacteria are already effectively reduced after the first disinfection cycle.

  • Patient colonisation and the incidence of nosocomial infections by waterborne bacteria are reduced by 50-70%.

  • By utilizing the MoveoSiphon you can reduce the need for antibiotics by approximately 30%, and the days of isolation for patients by approximately 35%.