CER - Certified Endoscope Reprocessor Endoscope Design and Structure Questions and Answers — Questions and Answers
Question 1: Which component of a flexible endoscope houses the angulation control knobs, suction valve, and air/water valve?
- Distal tip
- Insertion tube
- Control body (Correct answer)
- Light guide connector
Correct answer: Control body
The control body, or handpiece, is the main part of the endoscope that the operator holds. It contains all the primary controls, including the angulation knobs to steer the distal tip, and the valves for suction, air insufflation, and water for lens cleaning.
Question 2: A reprocessor notices that an endoscope is failing to hold air pressure during a dry leak test. After checking all external connections and valves, the leak persists. Which internal component is MOST likely compromised?
- Objective lens
- Light guide fibers
- Biopsy/suction channel (Correct answer)
- Video chip
Correct answer: Biopsy/suction channel
The biopsy/suction channel is a hollow lumen that runs the length of the endoscope from the control body to the distal tip. A breach or hole anywhere along this channel is a common cause of internal leaks that would be detected during a pressure test.
Question 3: The primary function of the light guide connector and the associated fiber optic bundles within the endoscope's universal cord is to:
- Transmit the image from the distal tip to the video processor.
- Carry electrical signals for the video chip.
- Deliver pressurized water for lens cleaning.
- Transmit light from an external source to illuminate the surgical site. (Correct answer)
Correct answer: Transmit light from an external source to illuminate the surgical site.
The light guide connector attaches the endoscope to an external light source. Bundles of fiber optic cables run through the universal cord and insertion tube to the distal tip, carrying high-intensity light to illuminate the body cavity being examined.
Question 4: Which of the following components are all located at the distal end of a flexible endoscope's insertion tube?
- Angulation knobs, suction valve, biopsy port
- Objective lens, light guide lens, instrument channel outlet (Correct answer)
- Video connector, air/water port, leak test port
- Bending section, control body, universal cord
Correct answer: Objective lens, light guide lens, instrument channel outlet
The distal end is the very tip of the endoscope that is inserted into the patient. It contains the objective lens for capturing the image, the light guide lens (or lenses) to emit light, and the outlet for the instrument/suction channel.
Question 5: During reprocessing, a technician is using a brush to clean the internal lumens of a gastroscope. Which part of the endoscope's structure is specifically designed to allow the passage of instruments like biopsy forceps and cleaning brushes?
- Elevator channel
- Air/water channel
- Instrument/Biopsy channel (Correct answer)
- Light guide channel
Correct answer: Instrument/Biopsy channel
The instrument channel, also known as the biopsy channel, is the lumen that runs from a port on the control body to the distal tip. It is designed for passing flexible instruments, such as biopsy forceps or snares, and is a critical area that requires meticulous brushing during reprocessing.
Question 6: The bending section of the insertion tube, controlled by the angulation knobs, allows for maneuverability of the endoscope's tip. This flexibility is achieved through the use of:
- A series of interconnected hydraulic pistons.
- An internal, flexible polymer rod.
- Pressurized air channels that inflate and deflate.
- A system of wires connected to the control knobs. (Correct answer)
Correct answer: A system of wires connected to the control knobs.
The angulation of the bending section at the distal end of the endoscope is controlled by a set of internal wires. These wires are directly connected to the up/down and left/right angulation knobs on the control body. Turning the knobs pulls on the wires, causing the tip to bend in the desired direction.
CER - Certified Endoscope Reprocessor Endoscope Design and Structure Questions and Answers
Which component of a flexible endoscope houses the angulation control knobs, suction valve, and air/water valve?