2026
Evaluation of retrograde bacterial migration in a prototype urinary drainage system with a silicone oil barrier
Slettengren M., van der Linden J. · Infection Prevention in Practice
Manual · Advanced
UnoMeter™ Safeti™ Maxmaximum safety for hourly diuresis
The most advanced closed-system UnoMeter™ in our range. Fourteen-day documented safe usage with triple action infection protection.
Infection prevention
14 days of documented patient safety – delivered by a triple action barrier design
The UnoMeter™ Safeti™ Max is the first 14-day urine measurement system that delivers a fully documented 100% barrier* against retrograde migration of bacteria and biofilm, designed to prevent bacteria- and biofilm-mediated ascending urinary infections originating from the urimeter.
Powered by UnoSafeCoat™, an innovative technology that coats the system internally, UnoMeter™ Safeti™ Max raises the bar for closed urinary drainage design. The innovative silicone technology is based on a well documented technology for infection control*.
1
The integrated filters deliver a documented 99.9% barrier* against bacteria and viruses, supporting system integrity.
2
UnoSafeCoat™ technology ensures a 100% barrier* against retrograde infection, preventing possible bacteria- and biofilm-mediated ascending urinary infections originating from UnoMeter™ Safeti™ Max.
3
KombiKon™ provides a documented barrier against bacterial entry for up to 10 sample collections*.
Infection prevention, translated into outcomes
- Having a 100% barrier reduces the risk of intra-luminal CAUTI
- Improved patient outcomes
- Freeing up hospital beds
Optimised nursing
75 hrs
Nursing time released per 1000 patients
Sustainability impact
24%
Reduction in waste vs. 7-day systems
Health-economic impact
24%
Fewer urimeters used per 1000 patients
Estimated savings
€80.391
Per urimeter, based on 1000 patients
* As demonstrated in vitro. Please visit our list of clinical documentation.
Clinical evidenceOptimised nursing
Time saved, safety delivered
Unimpeded flow provides effective workflows and accurate output readings
Freeing up nurse time through design
As a 14-day diuresis monitoring system, UnoMeter™ Safeti™ Max reduces the frequency of urimeter changes and frees up nursing resources for patient care. Combined with unimpeded flow and reliable measurement, it gives caregivers confidence and saves valuable time to enable focus on patient safety and care.
The UnoMeter™ Safeti™ Max does not lose the measurement in the chamber during transportation if placed with the front facing up.
Unimpeded flow for effective and accurate measurement
- 1
Double lumen tube designed to secure continuous flow and accurate measurement.
- 2
Documented accurate measurement also at low volumes due to continuous flow9.
- 3
Non-return valve in collection bag supports prevention of urine backflow to the chamber.
- 4
Filter in the open/close function and emptying bag: The filter is hydro- and oleophobic, which supports unimpeded flow, also in wet conditions.
Safety for caregiver and patient
- 5
Non-return valve at KombiKon™ connector protects against urine reflux during and after transportation, and there is no risk of not unclamping the tube after transportation.
- 6
The KombiKon™ urine sampling port with transparent inspection window allows observation of urine build-up, to enable less waiting time and a fresh urine sample.
Health-economic benefits, with three drivers:
- Unimpeded flow releases nursing time and improves accuracy.
- 24% fewer systems used2, due to documented 14 days of safe usage.
- 24% less nursing time used to change urimeters2, due to 14 days of safe usage.
2 Modelled estimate based on conversion from a 7-day to a 14-day system; not a measured outcome.
The evidence
Published materials
Abstract conclusion
UnoMeter Safeti Max provided a 100% effective barrier against the swarming motility and retrograde migration of P. mirabilis for 14 days. This silicone oil technology represents a significant advancement in “closed” urinary drainage design, offering a robust solution to prevent bacteria and biofilm-mediated ascending infections.
In vitro study. Study findings are from a controlled in vitro setting; clinical outcomes may differ.
Published materials
Article
Evaluation of retrograde bacterial migration in a prototype urinary drainage system with a silicone oil barrier. Article published by Infection Prevention in Practice, September 2026, the official open access journal of the Healthcare Infection Society.
Abstract
View full evidence page Prevention of retrograde Proteus mirabilis migration and biofilm formation in a novel urinary drainage system. Abstract published by the International Continence Society, Presented at Annual Meeting 2026.
Intended use
Hourly diuresis monitoring for precision urine output measurement.
Specifications
- Approved use
- Up to 14 days
- Meter chamber
- 40 ml high precision inner chamber + 500 ml precision chamber
- Bag volume
- 2,000 ml (3,000 ml via Exchange Bags)
- Sample port
- KombiKon™ needle-free with documented barrier against bacterial entry for up to 10 sample collections
- Infection control
- UnoSafeCoat™ technology
CE-marked medical device. For professional use only. Refer to instructions for use.
Clinical evidence
Research relevant to UnoMeter™ Safeti™ Max
Explore the published studies and independent reports that support this product and its technologies.
View all clinical evidenceRead the study
2026
Prevention of Retrograde Bacterial Migration in a Urinary Drainage System Using a Silicone Oil Barrier: A 14-Day In Vitro Study
Slettengren M., van der Linden J. · ICS Annual Meeting, Maastricht
2021
Silicone Oil Decreases Biofilm Formation in a Capacitance Based Automatic Urine Measurement System
Slettengren M., Linnros M., van der Linden J. · Sensors
2021
Evaluation of an automatic urinometer including use of silicone oil to decrease biofilm formation due to proteinuria, hemoglobinuria and bacterial growth
Slettengren M. · Doctoral thesis, Karolinska Institutet
2020
Making medical devices safer: impact of plastic and silicone oil on microbial biofilm formation
Slettengren M., Mohanty S., Kamolvit W., van der Linden J., Brauner A. · Journal of Hospital Infection
2015
Liquid-Infused Silicone as a Biofouling-Free Medical Material
MacCallum N., Howell C., Kim P., et al., Aizenberg J. · ACS Biomaterials Science & Engineering
2011
In vitro test of ascending contamination in different urine meter systems
Frimodt-Møller N., Corneliussen L. · Dept. for Microbiological Surveillance Research
2009
Closed System Study Test Report
Ashman P. · Surgical Materials Testing Laboratory, Princess of Wales Hospital
2005
In vitro test of different urine-meters in an experimental bladder-drainage model: prevention of ascending contamination depends on construction of the urine-meter
Frimodt-Moller N., Corneliussen L. · British Journal of Infection Control
2004
Performance of KombiKon needle free sample port
Tvede M. · Dept. of Clinical Microbiology, Rigshospitalet, University of Copenhagen
On file
14 day closed system study with UnoMeter Safeti Max
Research Institutes of Sweden (RISE) · Data on file, Observe Medical AB