IDI - Irish Decontamination Institute...

IDI - Irish Decontamination Institute

NOTE: These WFHSS web archive pages are not maintained anymore. Please visit for current WFHSS affairs.
/ IDI - Irish Decontamination Institute / Publications / Periodicals / Central Service / Central Service Archive / Central Service 4/2009
Central Service - Issue 4/2009

Central Service - Issue 4/2009

Central Service - Issue 4/2009


  • What's New in Standardisation: EN ISO 17665 Must be Applied
  • 4th Colloquium "Medical Instruments - Reprocessing, Value Preservation, Reuse". International wfk Detergency Conference, May 2009, Düsseldorf
  • IAHCSMM Annual Meeting Shines on Knowledge, Networking. 2 - 5 May 2009, Orlando, Florida


The "vCJD-Ophtha Commission" (vCJK-Ophtha) of the German Society of Ophthalmology (DOG) and Working Group Instrument Preparation (AKI) in cooperation with the firm Geuder AG:
Investigation of Alkaline Detergents for Automated Reprocessing of Ophthalmic Surgery Instruments in Terms of Material Compatibility and Alkaline Residues
(Zentr Steril 2009; 17 (4): 245-256)

Ophthalmologic instruments, in particular those used for surgery of the posterior segment of the eye should, as advocated by the Recommendation of the Robert Koch Institute (RKI) to prevent iatrogenic spread of transmissible spongiform encephalopathies, be reprocessed while also using an alkaline cleaning step. The present study investigated the effects of automated processes with and without steam sterilisation on the material compatibility and functionality of the instruments and also tested for absence of residual process chemicals. Inspection of the instruments after 100 decontamination cycles in each case did not show any sign of adverse effects on material compatibility or functionality. There was evidence of a risk of alkaline residues in narrow-lumened cannulas, especially if these became blocked during the decontamination process. Therefore a microfilter must be installed when purging these and routine spot checks must be carried out to check for any residual alkalinity.


I. Haas, H. Henn*, U. Junghannß, K. Kobel, D. Toth, H.C. Weiss and Working Group Instrument Preparation+:
Steam Sterilisation of Reusable Surgical Instruments

The aim of the present study was to investigate various process challenge devices (PCDs) already used in a previous study focusing on the sterilisability of reusable surgical instruments (Sterilisability Study) , but now using shorter sterilisation times. Sterilisation processes were conducted in a resistometer (134?°C) as well as in a test steriliser at temperatures of 132?°C (270?°F) and 134?°C (273?°F), using different hold times. The results obtained for the resistometer showed that in the "Thread" model no test organisms could be detected after a sterilisation time of 90 s. In the "Gap" and "Seal" models positive results were obtained after this sterilisation time because of the design features of these models. Complete inactivation of test organisms was achieved for the biological indicators used after 180 s. The other models used, i.e. the "Hose" model, both with and without a volume-reducing insert, and the two "Sliding surface" models, with metal as well as with plastic, continued to show microbial growth even after a 5-min exposure time.
The following results were obtained for the test steriliser: For the majority of tests conducted, with and without a load, in the test steriliser, there was no evidence of any test organism remaining after a hold time of either 90 s or 180 s and a temperature of 134?°C.
For the "Seal" and "Hose with insert" models, test organisms were detected in some cases, and this was confirmed by running a confirmatory test.
In the tests carried out at a temperature of 132?°C with hold times of 2 and 4 min, test organisms were recovered only in the "Hose with insert" model for the 2-min hold time, both with and without a ballast load.


Requirements for Construction or Conversion of a Hospital Central Sterile Supply Department Part 4 - Room Ventilation Systems in the CSSD

Information on this page provided with kind permission of: mhp-verlag GmbH
Address: Marktplatz 13
65183 Wiesbaden
Phone: +49-(0)611-50593 0
Fax: +49-(0)611-50593 11

mhp stands for publications in medicine, hygiene and prevention. For more than 20 years, the mhp publishing house has devoted itself to supporting developments aiming for a better standard of hygiene and infection control in hospitals and other medical facilities.

Free Access to Central Service E-Paper
Since 2008 Central Service has also been available as electronic E-Paper version. Subscriptions are possible to the print issue only, the online E-Paper issue only, or as a combined subscription to both. A free E-Paper version of back issues of Central Service is now available for subscribers to the print issue (starting from Volume 16, 2008). Please contact to order your free E-Paper access code.