Endoscopic Equipment & Instrumentation Flashcards
7 cards from real CET practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.
Read the first 7 Endoscopic Equipment & Instrumentation flashcards as text
Which type of endoscopic dilation device uses progressive-diameter rigid or semi-rigid cylinders passed over a guidewire?
Answer: Savary-Gilliard or Maloney bougie dilator
Savary-Gilliard bougies are tapered, flexible dilators in graduated sizes passed over a guidewire to progressively widen esophageal strictures.
The outer diameter of an endoscope is most critical when selecting a scope for use in:
Answer: Pediatric patients or patients with tight strictures
Smaller outer diameter scopes (pediatric or slim colonoscopes) are selected for pediatric patients or adult patients with narrow strictures that a standard scope cannot pass.
What is a 'cap-fitted endoscopy' technique, and what does the cap attach to?
Answer: A transparent plastic cap fitted onto the distal end of the endoscope to flatten and stabilize mucosa for improved visualization
A transparent distal attachment cap (hood) is placed on the scope tip to flatten mucosal folds, stabilize the view, and facilitate procedures like EMR or hemorrhoid ligation.
Which property of a guidewire used in ERCP is most important to prevent ductal perforation?
Answer: Hydrophilic or soft atraumatic tip design
A soft, atraumatic (often hydrophilic-coated) tip on the guidewire reduces the risk of ductal wall perforation during navigation of the biliary or pancreatic duct.
A self-expanding metal stent (SEMS) used to palliate malignant biliary obstruction is preferred over a plastic stent primarily because:
Answer: SEMS have a significantly larger lumen diameter and longer patency duration
SEMS expand to a much larger diameter (8–10 mm) than plastic stents (3–4 mm) and remain patent longer, reducing the frequency of stent exchange in palliative cases.
During capsule endoscopy, the recording device worn by the patient captures images transmitted by:
Answer: Wireless radiofrequency (RF) transmission from the capsule's antenna
The capsule endoscope contains a transmitter that sends image data via radiofrequency signals to electrode arrays on a vest or belt worn by the patient.
What is the primary reason endoscope angulation wires (control wires) can break or stretch over time?
Answer: Repeated flexion fatigue from angulation use and over-angulation during insertion
Control wires undergo thousands of flexion cycles during normal use, and repeated over-angulation accelerates metal fatigue, leading to wire fraying or breakage.