CER Endoscope Design and Structure Questions and Answers 4 — Questions and Answers
Question 1: Which internal structural layer of the endoscope insertion tube is primarily responsible for transmitting rotational torque to the distal tip?
- Outer polyurethane sheath
- Spiral metal mesh/coil layer (Correct answer)
- Image guide fiber bundle
- Angulation control wires
Correct answer: Spiral metal mesh/coil layer
The spiral metal mesh or coil wound within the insertion tube wall transmits torsional force so the endoscopist can steer the scope by rotating the control body.
Question 2: In a video endoscope, where is the image sensor (CCD or CMOS chip) located?
- Inside the control body housing
- Inside the universal cord connector
- At the distal tip of the insertion tube (Correct answer)
- Inside the external video processor
Correct answer: At the distal tip of the insertion tube
The image sensor is embedded in the distal tip to capture high-resolution images directly at the procedure site and transmit signals proximally.
Question 3: What is the primary purpose of the water-resistant (leak-test) cap applied to the light guide connector before reprocessing?
- To shield light fibers from chemical degradation
- To seal the connector so the scope can be fully submerged during reprocessing (Correct answer)
- To protect the video chip from thermal damage during disinfection
- To maintain positive pressure in the air/water channel
Correct answer: To seal the connector so the scope can be fully submerged during reprocessing
The water-resistant cap seals the light guide connector, allowing complete immersion of the scope body in detergent and high-level disinfectant solutions.
Question 4: Which endoscope type uses a side-viewing (lateral-viewing) optical design rather than a forward-viewing design?
- Colonoscope
- Bronchoscope
- Gastroscope
- Duodenoscope (Correct answer)
Correct answer: Duodenoscope
Duodenoscopes are side-viewing to allow the endoscopist to visualize and cannulate the ampulla of Vater during ERCP procedures.
Question 5: What dual function does the suction/biopsy channel valve serve during an endoscopic procedure?
- Controls air insufflation and regulates water flow
- Regulates water flow and powers the light source
- Activates suction and permits passage of accessories through the working channel (Correct answer)
- Controls light intensity and image capture
Correct answer: Activates suction and permits passage of accessories through the working channel
Depressing the suction/biopsy valve activates aspiration, and the same port allows accessories such as forceps and snares to be introduced.
Question 6: The universal cord of a flexible endoscope physically connects which two main components?
- Insertion tube to control body
- Bending section to insertion tube
- Control body to the external light source and video processor (Correct answer)
- Objective lens to the image guide bundle
Correct answer: Control body to the external light source and video processor
The universal cord (umbilical) carries light fibers, electrical wires, and fluid lines from the control body to the tower equipment (light source and processor).
Question 7: What material are the articulating rings within an endoscope's bending section most commonly made of?
- Titanium alloy
- Stainless steel (Correct answer)
- Anodized aluminum
- Copper alloy
Correct answer: Stainless steel
Stainless steel rings are used in the bending section because of their strength, corrosion resistance, and ability to tolerate repeated flexion cycles.
CER Endoscope Design and Structure Questions and Answers 4
Which internal structural layer of the endoscope insertion tube is primarily responsible for transmitting rotational torque to the distal tip?