Endoscope Design and Structure Flashcards
7 cards from real CER practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Endoscope Design and Structure flashcards as text
A 'double-channel' endoscope differs from a standard endoscope in that it has:
Answer: Two instrument channels running through the insertion tube
Double-channel endoscopes contain two parallel instrument channels, allowing simultaneous passage of two accessories or improved suction capability.
The 'up/down' and 'left/right' angulation knobs on the control body operate by:
Answer: Tension applied to stainless steel angulation wires attached to the bending section
Rotating the angulation knobs adjusts tension on stainless steel wires that run through the insertion tube and attach to the bending section, causing tip deflection.
What is the significance of a 'waterproof' vs. 'water-resistant' rating on endoscope components?
Answer: Waterproof components can be fully immersed during reprocessing; water-resistant ones cannot
Only components rated as waterproof or fully immersible may be submerged in liquid during reprocessing; water-resistant components may only tolerate surface moisture.
In flexible endoscope construction, what is the role of the 'mesh braid' layer within the insertion tube?
Answer: It provides torque transmission and prevents kinking of the tube
The stainless steel mesh braid layer within the insertion tube transmits rotational torque from the control body to the distal end and prevents the tube from kinking.
Which structure on the distal end of a colonoscope provides insufflation of the colon during the procedure?
Answer: Air/water nozzle directed at the objective lens and cavity
The air/water nozzle at the distal tip directs air into the colon for insufflation and water onto the objective lens for cleaning, both critical to visualization.
Why are bronchoscopes generally smaller in diameter than colonoscopes?
Answer: They are designed for use in the narrower airways of the pulmonary system
Bronchoscopes must fit within the trachea and bronchi, which are much narrower than the colon, necessitating a smaller insertion tube diameter.
The 'suction channel' and 'instrument channel' in many endoscopes refer to:
Answer: The same channel, which serves dual purposes
In most standard endoscopes, the suction channel and instrument channel are the same lumen, allowing it to be used for suctioning fluids or passing accessories.