CMDRT - Certified Medical Device Reprocessing Technician Instrument Assembly and Packaging Questions and Answers 2 — Questions and Answers

Question 1: What is the primary purpose of inspecting instruments before assembly into sets?

To count instruments for inventory purposes only
To verify that instruments are clean, functional, and free of damage that could compromise sterilization or patient safety (Correct answer)
To organize instruments by colour
To determine which instruments need sharpening

Correct answer: To verify that instruments are clean, functional, and free of damage that could compromise sterilization or patient safety

Inspection ensures that each instrument is thoroughly clean (no residual soil), properly functioning (hinges, ratchets, cutting edges), and free of defects (cracks, pitting, corrosion) that could harbour microorganisms or fail during surgery.

Instrument inspection in the assembly area is a critical quality checkpoint in the reprocessing workflow. According to CSA Z314.8, every instrument must be inspected before it is assembled into a tray or set. The inspection serves multiple purposes: (1) Verifying cleanliness — using magnification if needed, checking for residual soil in box locks, serrations, lumens, and other hard-to-clean areas. Any instrument with visible soil must be returned for re-cleaning. (2) Checking functionality — testing scissors for cutting ability, verifying forceps alignment, confirming ratchets hold securely, and testing needle holders for grip. (3) Assessing condition — looking for corrosion, pitting, cracks, worn tips, loose screws, and other damage. Damaged instruments can harbour microorganisms in surface irregularities that are inaccessible to sterilants. They may also fail during surgery, creating patient safety risks. Instruments failing inspection must be removed from service.

Question 2: What types of packaging materials are acceptable for steam sterilization according to CSA standards?

Aluminum foil and plastic bags
Validated packaging materials such as sterilization wrap (SMS or crepe), peel pouches, rigid containers, and sterilization paper that allow steam penetration and maintain sterility (Correct answer)
Any fabric material
Ordinary brown paper bags

Correct answer: Validated packaging materials such as sterilization wrap (SMS or crepe), peel pouches, rigid containers, and sterilization paper that allow steam penetration and maintain sterility

Packaging for steam sterilization must allow steam penetration during the sterilization cycle and maintain a microbial barrier during storage. CSA Z314.8 specifies that only validated packaging materials designed for sterilization should be used.

CSA Z314.8 and CSA Z314.3 specify that packaging materials for steam sterilization must meet two critical requirements: they must be permeable to the sterilant (steam) during the sterilization cycle, and they must provide an effective microbial barrier to maintain sterility during storage and transport. Acceptable materials include: sterilization-grade wrap (SMS — spunbond-meltblown-spunbond polypropylene, or medical-grade crepe paper) used in sequential double wrapping; peel pouches (paper-plastic or Tyvek-plastic) for individual instruments or small sets; rigid sterilization containers with validated filter or valve systems; and sterilization-grade paper (for flat wrapping). Materials NOT acceptable include: aluminum foil (impermeable to steam), closed containers without filtered vents, non-medical-grade paper, and plastic bags without porous panels. All packaging materials must be cleared by Health Canada and validated by the manufacturer for the specific sterilization method.

Question 3: What is the sequential wrapping technique and why is it recommended?

Wrapping instruments in a single layer of plastic
Using two layers of sterilization wrap applied in separate, sequential steps to provide a double barrier and facilitate aseptic presentation (Correct answer)
Wrapping instruments in newspaper before sterilization
Using one very thick layer of wrap instead of two thinner ones

Correct answer: Using two layers of sterilization wrap applied in separate, sequential steps to provide a double barrier and facilitate aseptic presentation

Sequential double wrapping creates two independent microbial barriers. If the outer wrap is accidentally compromised during handling or storage, the inner wrap maintains sterility. It also facilitates aseptic opening in the sterile field.

Sequential wrapping (also called double wrapping) involves applying two separate layers of sterilization wrap around an instrument tray or set. Each layer is applied independently using an envelope fold or square fold technique, with the inner wrap serving as the primary microbial barrier and the outer wrap providing additional protection. CSA Z314.3 recommends this technique because: (1) Redundancy — if the outer layer sustains a breach during handling, transport, or storage, the inner layer maintains the sterile barrier; (2) Aseptic presentation — in the operating room, the outer wrap can be opened by the non-sterile team member, while the inner wrap is opened by the sterile team member, facilitating aseptic technique; (3) Integrity — two layers are more resistant to puncture and tearing during handling. When using SMS wrap, a single sheet can be used per layer (simultaneous wrapping with two sheets is also acceptable if the facility has validated it). The wraps must be sealed with sterilization indicator tape.

Question 4: What information must be included on the label of a sterilized package?

Only the date
Contents description, sterilizer number, cycle/load number, date of sterilization, and expiry date or event-related statement (Correct answer)
Only the technician's name
No labelling is required

Correct answer: Contents description, sterilizer number, cycle/load number, date of sterilization, and expiry date or event-related statement

Comprehensive labelling ensures traceability from the sterilized package back to the specific sterilization cycle. This is essential for quality assurance, recall management, and regulatory compliance.

Package labelling is a mandatory requirement of CSA Z314.3 and is essential for traceability, quality assurance, and recall management. Required information includes: (1) Contents description — clearly identifying what instruments or set is inside; (2) Sterilizer identification number — which specific sterilizer was used; (3) Cycle or load number — the specific cycle within that day's sterilization runs; (4) Date of sterilization — when the items were processed; (5) Expiry date or event-related sterility statement — indicating how long the package maintains sterility (time-related) or that sterility is maintained until the package is opened or compromised (event-related); (6) Operator initials — who assembled and processed the package. This information enables complete traceability: if a sterilization failure is detected (e.g., a positive biological indicator), all packages from that load can be identified and recalled. Labels must be applied using sterilization-compatible markers or labels that will not be affected by the sterilization process.

Question 5: What is the maximum recommended weight for a wrapped instrument tray to be sterilized?

No weight limit applies
25 pounds (11.4 kg) as recommended by CSA and AAMI standards to ensure adequate steam penetration (Correct answer)
100 pounds (45 kg)
50 pounds (22.7 kg)

Correct answer: 25 pounds (11.4 kg) as recommended by CSA and AAMI standards to ensure adequate steam penetration

Heavy trays can impede steam penetration to the centre of the package, resulting in sterilization failure. The 25-pound limit ensures that steam can reach all instrument surfaces within the standard sterilization cycle parameters.

CSA Z314.3 and AAMI ST79 recommend a maximum weight of 25 pounds (11.4 kg) for wrapped instrument trays processed in steam sterilizers. This limit exists because the mass of instruments in a heavy tray acts as a thermal sink — the metal absorbs heat energy, making it harder for steam to penetrate to the centre of the pack and achieve the required temperature for the required duration. Trays exceeding the weight limit may have cold spots where sterilization conditions are not met, even though the sterilizer's mechanical indicators (time, temperature, pressure) appear normal. In addition to weight, the overall dimensions of the package must not exceed the sterilizer manufacturer's specifications. Tray density (how tightly instruments are packed) also affects steam penetration — instruments should be arranged to allow steam circulation, not stacked tightly. Facilities should periodically weigh trays during assembly to ensure compliance.

Question 6: Why should instruments with ratchets be sterilized in the open (unlocked) position?

To prevent damage to the ratchet mechanism
To allow steam to contact all surfaces including the concealed areas under the ratchet and within the box lock (Correct answer)
To make instruments easier to count
Open instruments take up less space in the tray

Correct answer: To allow steam to contact all surfaces including the concealed areas under the ratchet and within the box lock

When ratchets are closed, the overlapping metal surfaces prevent steam from reaching the concealed areas beneath the ratchet and inside the box lock. Opening them ensures complete steam contact with all instrument surfaces for effective sterilization.

Instruments with ratchets (such as hemostats, needle holders, and clamps) must be processed in the open or unlocked position during steam sterilization. When a ratchet is engaged (closed), the interlocking metal teeth overlap and create areas where steam cannot penetrate. Similarly, the box lock joint of a hinged instrument traps moisture and soil when closed. If steam cannot contact these concealed surfaces, microorganisms present in these areas will survive the sterilization process, rendering the instrument non-sterile despite the cycle parameters appearing normal. CSA Z314.3 requires that all instruments be opened, disassembled (where applicable), and positioned to maximize sterilant contact. Instrument stringers or racks can be used to keep ratcheted instruments in the open position during sterilization. This principle applies not only to steam but to all sterilization methods — the sterilant must be able to contact every surface of every instrument.

CMDRT - Certified Medical Device Reprocessing Technician Instrument Assembly and Packaging Questions and Answers 2

What is the primary purpose of inspecting instruments before assembly into sets?