CER Endoscope Design and Structure Questions and Answers 3 — Questions and Answers
Question 1: Which component unique to duodenoscopes is designed to deflect accessories exiting the working channel toward the target tissue?
- Biopsy port cap
- Elevator (deflecting mechanism) (Correct answer)
- Angulation control knob
- Air/water valve
Correct answer: Elevator (deflecting mechanism)
The elevator (deflecting mechanism) in duodenoscopes redirects accessories such as catheters toward the ampulla of Vater during ERCP.
Question 2: Which material is most commonly used for the outer sheath of a flexible endoscope's insertion tube?
- Silicone rubber
- Latex
- Polyurethane (Correct answer)
- Neoprene
Correct answer: Polyurethane
Polyurethane is the standard outer sheath material because it offers flexibility, durability, and resistance to repeated chemical reprocessing.
Question 3: What is the primary purpose of the air/water channel in a flexible endoscope?
- To aspirate secretions from the lumen
- To pass biopsy forceps distally
- To insufflate the lumen and flush the objective lens (Correct answer)
- To transmit illumination to the distal tip
Correct answer: To insufflate the lumen and flush the objective lens
The air/water channel delivers air for lumen distension and water to clear debris from the objective lens, maintaining visualization.
Question 4: How many angulation wires are found in a flexible endoscope capable of four-way (up/down/left/right) deflection?
- Two
- Three
- Four (Correct answer)
- Six
Correct answer: Four
Four angulation wires are required—one for each direction of deflection—controlled by two pairs via the up/down and left/right knobs.
Question 5: What is the term for the distal-most articulating segment of a flexible endoscope that responds to control knob movement?
- Insertion tube
- Umbilical cord
- Control body
- Bending section (Correct answer)
Correct answer: Bending section
The bending section is the short, actively articulating segment at the distal end, controlled by angulation knobs on the control body.
Question 6: Which endoscope component transmits the image from the distal tip to the eyepiece or external video processor?
- Biopsy working channel
- Light guide fiber bundle
- Image guide fiber bundle or CCD/CMOS chip (Correct answer)
- Objective lens housing alone
Correct answer: Image guide fiber bundle or CCD/CMOS chip
Fiberoptic scopes use an image guide fiber bundle; video scopes use a CCD or CMOS chip at the distal tip to relay electronic image data.
Question 7: What is the primary function of O-rings located at endoscope channel port openings?
- To anchor the light guide fiber bundle
- To stabilize angulation wire tension
- To attach the universal cord to the control body
- To create a watertight seal preventing fluid ingress during immersion (Correct answer)
Correct answer: To create a watertight seal preventing fluid ingress during immersion
O-rings form a watertight seal at channel openings to prevent disinfectant or cleaning fluid from entering internal components during reprocessing.
CER Endoscope Design and Structure Questions and Answers 3
Which component unique to duodenoscopes is designed to deflect accessories exiting the working channel toward the target tissue?