IAHCSMM Packaging and Sterile Barrier Systems 1 — Questions and Answers
Question 1: A sterile barrier system (SBS) must provide all of the following EXCEPT:
- Microbial barrier protection
- Compatibility with the sterilization method used
- Prevention of moisture passage that could compromise sterility
- A specific color to distinguish sterile from non-sterile items (Correct answer)
Correct answer: A specific color to distinguish sterile from non-sterile items
While chemical process indicators on packaging can change color to confirm processing, the sterile barrier system itself does not require a specific color - color is not a required SBS property.
ISO 11607 (Packaging for terminally sterilized medical devices) defines sterile barrier system requirements including: microbial barrier (prevents microbial contamination), compatibility with the sterilization method (e.g., steam-permeable for steam sterilization), ability to allow sterilant penetration and removal, integrity (no holes, tears, or inadequate seals), protection during storage and distribution, and ability to be opened aseptically. Color is not a required property.
Question 2: Which packaging material is most appropriate for steam sterilization of standard surgical instrument sets?
- Aluminum foil wrapping
- Plastic film pouches sealed on all sides
- Non-woven polypropylene wrap or woven textile wrap (Correct answer)
- Sealed aluminum containers without venting
Correct answer: Non-woven polypropylene wrap or woven textile wrap
Non-woven polypropylene wrap (e.g., SMS wrap, Kimguard) or woven textile wrap allows steam penetration while providing a microbial barrier - both are validated for steam sterilization.
Steam sterilization packaging must allow steam to penetrate to the instruments and be removed at cycle completion. Non-woven polypropylene materials (SMS wrap) are widely used because they: allow steam penetration, provide effective microbial barrier protection, maintain integrity during storage, and can be opened aseptically. Woven textile wrap (muslin) is also used but requires inspection for holes after each wash cycle. Impermeable materials (aluminum foil, sealed plastic with no porosity) block steam penetration and are not suitable for steam sterilization.
Question 3: When using peel pouches (paper-plastic pouches) for sterilization, the correct loading orientation for sterilizer placement is:
- Paper side up in all sterilizer types
- Plastic side up in all sterilizer types
- Per the sterilizer and pouch manufacturer IFU, typically paper side down in gravity displacement sterilizers (Correct answer)
- Instruments must be removed from pouches before sterilization
Correct answer: Per the sterilizer and pouch manufacturer IFU, typically paper side down in gravity displacement sterilizers
Peel pouch orientation should follow both the sterilizer and pouch manufacturer IFU; for gravity displacement sterilizers, paper side down is typically recommended to facilitate condensate drainage.
The correct loading orientation for peel pouches (paper/plastic Tyvek pouches) varies by sterilizer type and must follow manufacturer IFUs. In gravity displacement sterilizers, paper side down is generally recommended to allow condensate to drain away from the paper layer, preventing paper saturation that would compromise the sterile barrier. Pouches should not be overloaded (instrument tip touching the seal area), as this can compromise seal integrity.
Question 4: The sequential wrapping method (double wrapping) for instrument trays provides which advantage?
- Increases temperature inside the package during sterilization
- Creates an additional sterile barrier layer allowing aseptic presentation (inner wrap maintains sterility after outer wrap is removed) (Correct answer)
- Reduces the need for chemical indicators inside packages
- Speeds up sterilization cycle times
Correct answer: Creates an additional sterile barrier layer allowing aseptic presentation (inner wrap maintains sterility after outer wrap is removed)
Sequential (double) wrapping provides two sterile barrier layers; the outer wrap protects during storage and is removed in the clean corridor, while the inner wrap maintains sterility during transport into the sterile field for aseptic opening.
Sequential wrapping involves wrapping an instrument set in two separate sheets of wrap applied sequentially (one sheet at a time, not simultaneously). This creates two complete sterile barrier layers. During OR use, the outer wrap is removed in the outer sterile corridor (reducing contamination risk), and the inner wrapped package can be presented directly to the sterile field for aseptic opening. The technique also provides backup protection if the outer wrap is compromised during storage or transport.
Question 5: Which of the following is required on the external labeling of every sterilized package?
- The patient name who will use the instruments
- Contents or set name, sterilizer ID, lot or load number, and date (Correct answer)
- The purchase price of instruments in the tray
- The technician personal employee ID number only
Correct answer: Contents or set name, sterilizer ID, lot or load number, and date
Every sterilized package must be labeled with contents or set name, sterilizer identification, lot or load number, and date - enabling traceability for quality assurance and recall capability.
Sterilization package labeling requirements per AAMI ST79 and TJC include: contents identification (set name or item description), sterilizer number (identifies which specific sterilizer was used), load and lot number (identifies the specific cycle), sterilization date (and expiration or hang-time date if facility policy uses time-related sterility for specific items), and operator identification (some facilities require this). These data points enable traceability - if a BI failure is discovered, all items from that specific sterilizer load can be identified and recalled.
Question 6: What is the purpose of tray liners in surgical instrument sets?
- To make trays look more professional for OR staff
- To absorb moisture and condensate during sterilization, helping the load dry and preventing water pooling on instruments (Correct answer)
- To add weight to trays for stability during sterilization
- To substitute for chemical indicators inside the tray
Correct answer: To absorb moisture and condensate during sterilization, helping the load dry and preventing water pooling on instruments
Tray liners (typically non-woven disposable fabric) absorb moisture and condensate that forms during steam sterilization cycles, facilitating load drying and preventing water from pooling around instruments.
Steam sterilization generates condensate inside instrument trays as steam contacts cooler metal surfaces. If condensate pools on instruments or within packaging, it can: cause wet packs (load does not dry properly - a packaging failure requiring reprocessing), contribute to instrument corrosion, and provide a moisture pathway for microbial recontamination. Tray liners (non-woven absorbent materials placed under instruments in the tray container) absorb condensate, improve drying, and reduce wet pack events. Proper tray liner use is part of AAMI ST79 loading guidelines.
IAHCSMM Packaging and Sterile Barrier Systems 1
A sterile barrier system (SBS) must provide all of the following EXCEPT: