CER Endoscope Design and Structure 2 — Questions and Answers
Question 1: Which component of a flexible endoscope houses the imaging sensor or fiber optic bundle at the distal tip?
- Control section
- Insertion tube
- Distal end (Correct answer)
- Universal cord
Correct answer: Distal end
The distal end contains the imaging sensor (CCD/CMOS) or fiber optic bundle, along with the light guide lens and instrument channel opening.
Question 2: What is the primary purpose of the biopsy/instrument channel in a flexible endoscope?
- To circulate water for cleaning during procedures
- To allow passage of accessories such as forceps and snares (Correct answer)
- To house the angulation wires
- To contain the light guide fibers
Correct answer: To allow passage of accessories such as forceps and snares
The instrument channel (also called the working or biopsy channel) allows clinicians to pass accessories like biopsy forceps, snares, and brushes to the operative site.
Question 3: The angulation or bending section of a flexible endoscope is located:
- At the proximal end near the control body
- At the distal end just proximal to the tip (Correct answer)
- In the middle of the insertion tube
- Inside the universal cord
Correct answer: At the distal end just proximal to the tip
The bending section is located just behind the distal tip and allows the endoscope tip to deflect in response to angulation knob movements.
Question 4: Which material is commonly used to form the outer sheath of the insertion tube to provide flexibility and durability?
- Stainless steel mesh only
- Polyurethane or rubber over a metal mesh braid (Correct answer)
- Silicone tubing without reinforcement
- Rigid polycarbonate
Correct answer: Polyurethane or rubber over a metal mesh braid
The insertion tube outer sheath is typically made of polyurethane or rubber material supported by a braided metal mesh, providing both flexibility and structural integrity.
Question 5: In a video endoscope, what converts optical images into electronic signals at the distal tip?
- Charge-coupled device (CCD) or CMOS sensor (Correct answer)
- Fiber optic image bundle
- Objective lens array
- Beam splitter prism
Correct answer: Charge-coupled device (CCD) or CMOS sensor
Video endoscopes use a CCD or CMOS chip at the distal tip to convert optical images directly into electronic signals transmitted to the video processor.
Question 6: The water/air channel in a flexible endoscope is used to:
- Inflate the colon for colonoscopy and wash the lens (Correct answer)
- Circulate coolant around the light guide
- Flush the instrument channel between samples
- Provide suction at the distal tip
Correct answer: Inflate the colon for colonoscopy and wash the lens
The water/air channel delivers air to insufflate body cavities and water to flush the objective lens, maintaining a clear view during the procedure.
Question 7: Which endoscope component is most susceptible to damage from improper coiling or tight bends during transport and storage?
- Light guide connector
- Control body housing
- Insertion tube and bending section (Correct answer)
- Suction valve port
Correct answer: Insertion tube and bending section
The insertion tube and delicate bending section are most vulnerable to kinking and internal wire breakage when coiled too tightly or bent sharply.
CER Endoscope Design and Structure 2
Which component of a flexible endoscope houses the imaging sensor or fiber optic bundle at the distal tip?