CRCST Surgical Instrumentation 2 — Questions and Answers
Question 1: What is the most critical first step in processing surgical instruments immediately after a procedure?
- Place instruments directly into the autoclave for sterilization
- Perform point-of-use pre-cleaning to prevent soil from drying (Correct answer)
- Apply instrument lubricant before transporting to decontamination
- Wrap and package instruments for the next procedure
Correct answer: Perform point-of-use pre-cleaning to prevent soil from drying
Point-of-use pre-cleaning (wiping or rinsing instruments immediately after use) prevents blood and tissue from drying and hardening, which significantly complicates cleaning and can damage instrument surfaces.
Question 2: What type of lubricant is appropriate for use on surgical instruments after cleaning?
- Petroleum-based grease for maximum long-term protection
- WD-40 or similar penetrating oil sprays
- Water-soluble instrument milk or lubricant (Correct answer)
- Mineral oil applied generously to all surfaces
Correct answer: Water-soluble instrument milk or lubricant
Only water-soluble instrument lubricants (instrument milk) should be used because petroleum-based products form a barrier that prevents steam penetration and interferes with effective sterilization.
Question 3: Pitting corrosion on surgical instruments is most commonly caused by:
- Excessive steam sterilization cycles over many years
- Contact with chloride-containing solutions such as saline or blood left on surfaces (Correct answer)
- Use of water-soluble lubricants after cleaning
- Exposure to high-pH instrument cleaning solutions
Correct answer: Contact with chloride-containing solutions such as saline or blood left on surfaces
Chlorides in blood, saline, and some cleaning solutions attack the protective passive film on stainless steel, creating small pits that grow and weaken the instrument over time.
Question 4: What is the correct method for testing surgical scissors for proper sharpness and alignment?
- Cut through a piece of cloth and look for fraying
- Cut lightly salted gauze while checking blade efficiency
- Attempt to cut through dry gauze along the full blade length and check for smooth, snag-free cutting (Correct answer)
- Visually inspect the blades for visible nicks under bright light only
Correct answer: Attempt to cut through dry gauze along the full blade length and check for smooth, snag-free cutting
Scissors should cut smoothly through dry gauze along the entire blade length without snagging, dragging, or pushing; any resistance indicates a sharpening or alignment problem.
Question 5: The 'passive film' on stainless steel surgical instruments provides corrosion resistance because it consists of:
- A thin coating of nickel applied during manufacturing
- A chromium oxide layer that forms naturally on the surface (Correct answer)
- A layer of carbon steel reinforcement inside the alloy
- A factory-applied protective lacquer over the metal
Correct answer: A chromium oxide layer that forms naturally on the surface
Stainless steel's corrosion resistance depends on a thin, self-regenerating chromium oxide passive film; damage to this layer (by chlorides, scratches, or harsh cleaners) allows rust and corrosion to develop.
Question 6: An instrument should be removed from service and sent for repair or disposal when:
- It has been used in more than 100 procedures regardless of condition
- Inspection reveals cracks, broken tips, misalignment, or functional failure (Correct answer)
- It has been sterilized more than 50 times
- It is more than one year old
Correct answer: Inspection reveals cracks, broken tips, misalignment, or functional failure
Retirement decisions are based on the instrument's physical condition and function, not time or cycle count; defects such as cracks, broken tips, or misalignment compromise patient safety.
Question 7: During steam sterilization, hinged instruments such as scissors and clamps must be positioned:
- Fully closed to protect the tips from damage during the cycle
- Open so steam can contact and penetrate all internal surfaces including the box lock (Correct answer)
- Tip-down in a closed container to contain any residual soil
- Wrapped tightly together in groups to save tray space
Correct answer: Open so steam can contact and penetrate all internal surfaces including the box lock
Hinged instruments must be placed in the open (unlocked) position so steam can reach all surfaces, particularly the box lock, where residual soil and trapped air can prevent sterilization.
CRCST Surgical Instrumentation 2
What is the most critical first step in processing surgical instruments immediately after a procedure?