Central Service 04/2018

Content Issue 04/2018 Central Service



  • 14th Swiss Sterilization Conference, 20 to 21 June 2018, Biel
  • NHSScotland 2018 Decontamination Seminar


  • N. Lapanaitis*, L. Frizzell, A. Downing and J.P.C.M. van Doornmalen
    Case study: Correlation between the duration of a steam sterilisation process and the weight of the processed load


  • DGSV Committee for Hygiene, Construction and Technology
    Requirements for construction or reconstruction of a Reprocessing Unit for Medical Devices (RUMED). Part 7: Rooms and their allocation for reprocessing flexible endoscopes



  • Quality Management in the CSSD – Standard Surgical Instruments – Part 5: Visual inspection, maintenance and functional testing of standard ring needle holders with and without tungsten carbide inserts


  • DGSV Quality Task Group
    Information to be provided by the medical device manufacturer for the processing of medical devices – Recent amendments to EN ISO 17664 – Part 2

Events 2018

N. Lapanaitis1, L. Frizzell1, A. Downing2 and J.P.C.M. van Doornmalen3
1 3M Australia, Building A, 1 Rivett Road North Ryde, NSW, 2113, Australia
2 The Mater Misericordiae Hospital, 25 Rocklands Road North Sydney, NSW, 2060, Australia
3 Eindhoven University of Technology, Department of Applied Physics, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands

Case study: Correlation between the duration of a steam sterilisation process and the weight of the processed load
Background: There is a common understanding that load mass has an effect on the duration of a steam cycle. However, no information was found in the literature that addresses trends in the duration of steam sterilisation processes and the effect of load weights.
Aim: To find an explanation for variations in the duration of steam sterilization cycles related to weight of the load.
Method: A case study was performed with a protocol and an independent logging device in three sterilisers. Divided over three similar brand and type sterilisers, more than 700 datasets were acquired and analysed.
Result: On the three sterilisers of the same make, model and chamber size, a correlation between the duration of a process and the weight of the sterilised load was found. It was also found that across three sterilisers, different durations for the sterilization processes for the same sterilisation load weight range were identified. One steriliser also showed different results for similar weight range in both the conditioning and the plateau period of the sterilization process.
Conclusion: The results demonstrate that in this case study, the duration of a cycle with a linear trend line can be estimated when the steriliser, its process and the weight of the load is known. The results also demonstrate that a single steriliser can exhibit different performance profiles for the same load weight. This information can also be used to profile sterilisation cycles and plan sterilisation processes for the sterilising department. The method may be applicable to other brands and types of sterilisers.