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IDI - Irish Decontamination Institute

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Central Service - Issue 1/2014

Central Service - Issue 1/2014

Central Service - Issue 1/2014


  • What's New in Standardisation: Absolute pressure
  • 13th Schleswig-Holstein CSSD Hygiene Forum
  • Expertise of persons entrusted with monitoring medical device reprocessing
  • Acquisition of expertise by persons entrusted with monitoring medical device reprocessing. Experiences from the perspective of a hospital infection control officer


P. Heeg, J Gauer:
Automatic, validated, non-toxic high-level disinfection (HLD) of ultrasound transducers

Ultrasound transducers are complex medical devices widely used to conduct transvaginal, transrectal, abdominal and intraoperative sonography examinations. As ultrasound transducers may come in contact with mucosal membranes, diseased skin, infected tissue and blood, they underlie strict guidelines for reprocessing. Requirements for reprocessing semi-critical medical devices class A such as endocavity ultrasound probes include an effective cleaning process that physically removes infectious agents and the organic matter on which they thrive followed by a validated, preferably automated high-level disinfection (HLD). The objective of the present study was to evaluate a newly developed system specifically designed to provide an automated, validated HLD of ultrasound transducer probes. The study summarizes the results derived from validation and microbiological efficacy testing of the device to prove the safety, consistency and reliability of the disinfection process.
ultrasound transducers high-level disinfection validation infection prevention

M. Emmrich, R. Blo und H. Martiny:
Glutaraldehyde (GA) Residues in Flexible Endoscopes Part I: Development of an Analytical Method for Detection of GA Residues

Glutaraldehyde (GA) is a frequently used agent for reprocessing flexible endoscopes. However, reprocessing of these instruments remains difficult and residual GA in processed endoscopes may lead to toxic effects, such as necrosis, colitis, and proctitis. Measuring GA concentrations in rinsing water is not sufficient, since GA residues on endoscopes are not only affected by GA concentrations in the rinsing water but also by the processing conditions and by the properties of the processed endoscope (e. g. type, age, material). Therefore, monitoring residual GA on flexible endoscope surfaces is desirable. For method development, the extraction efficacy for GA on endoscopes was investigated using three different extraction solutions (Aqua dest., «Water of Standardized Hardness» [WSH] and buffer) each at two pH values (pH 2 and pH 7) and two temperatures (20 C and 36 C or 40 C). Original endoscope tubing pieces and two endoscopes were processed in a washer-disinfector (WD), followed by GA extraction and HPLC analysis. Both pH and temperature have a significant impact on the GA extraction efficacy. The highest GA extractability was achieved with the higher temperature in combination with the lower pH. Aqua dest. and WSH show similar extraction properties, whereas GA extractability is considerably reduced when the buffer at pH 7 is used.
Glutaraldehyde endoscopes disinfectant residues analytical method EN ISO 15883 accessory kit


Recommendations by the «Quality Task Group»: Reprocessing sterilization containers with synthetic components used for sterile supplies and for contaminated medical devices

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