What is the alternative term for a Barnett reservoir?

• A. Ileoanal reservoir
• B. A living collar
• C. Continent ileal reservoir
• D. Internal pouch

Answer: (B)

A Barnett reservoir is an early form of continent ileostomy, where a segment of ileum is fashioned into a reservoir with a tissue-based continence mechanism. The term “a living collar” describes the cuff of ileal tissue that surrounds the valve and provides the continence by acting like a natural collar or ring to prevent leakage between catheterizations. This tissue cuff remains living and functional, which is why the alternative name emphasizes the physical, tissue-based mechanism.

Other terms like “contient ileal reservoir” or “internal pouch” refer to continent ileostomy concepts in general, and “ileoanal reservoir” describes a different configuration (an ileal pouch connected to the anal canal). The Barnett reservoir specifically is best described by the “living collar” term because it highlights the tissue-based continence feature of that design.