MHP

Central Service 02/2018

Content Issue 02/2018 Central Service

Editorial 

NEWS UPDATE

  • 3rd Annual Infection Control, Sterilization and Decontamination in Healthcare Congress. London, 21 – 22 February 2018 
  • Innovative answers to new challenges in reprocessing and hygiene. 10th Hamburg Symposium of Chemische Fabrik Dr. Weigert GmbH, 22 February 2018 

MAIN ARTICLES

  • G. Kirmse*, M. Graf
    Comparison of cleaning and drying performance of different designs of instrument baskets 
  • B. Hornei, M.-Th. Linner, A. Jones, Committee for Hygiene, Construction and Technology: A. Carter, K. Wiese, M. Schick-Leisten, A. Wentzler, U. Haffke, M. Scherrer
    Control of environmental conditions in a Reprocessing Unit for Medical Devices (RUMED) 

RECOMMENDATIONS

  • DGSV Quality Task Group: No reprocessing of kidney bowls or wash bowls in bedpan washer-disinfectors

Events 2018

MAIN ARTICLE
Comparison of cleaning and drying performance of different designs of instrument baskets 
G. Kirmse*, M. Graf

Keywords: 

  • surgical instrument
  • decontamination
  • instrument baskets
  • cleaning
  • drying

Summary:
Instruments baskets made from sheet metal (compared to wires) protect instruments better but drying and cleaning performance are frequently controversially discussed. This study compares drying of loads of 50 standard instruments in wire and sheet metals baskets under different drying temperatures and times, with and without rinse aid (different formulas and dosages). The weight difference is measured before and after cleaning in repeated cycles. The cleaning performance is compared by a PCD (Process Challenge Device) system (Helimatic Performance Qualification), which is based on a detachable box-locks und two different cleaning processes.
It turns out that for both parameters there is no significant difference of the results by the basket design. The drying result is mainly influenced by the drying time and the position in the chamber (the drying temperature is less influential). The use of rinse aid can shorten the drying time under these circumstances by 5–10min. The cleaning performance was in similar ways influenced by process design and level in the chamber. Another common observation in daily practice are stains on instruments which mirror the basket structure, either after cleaning/disinfection or steam sterilization. This has to be addressed by optimizing the media quality. So processes should be optimized based on worst case positions and loads based on the individual installation and process requirements. 

Background
There are different designs of instrument baskets in the market, based either on wire mesh or on sheet metal grids (see Figure 1). While it is undisputed that sheet-metal-baskets provide a better protection of the content (penetration of instruments etc.), there are often concerns regarding cleaning and drying performance. However there is so far no evidence available actually comparing the performance of the various designs. The German society for Sterile Supply (DGSV) has published an advisory note in Central Service, but here potential advantages and disadvantages are only listed and not quantified nor tested . At the same time there is no precise information available about the effects of a rinse aid for a metal [...]