Which statement accurately describes lumen/crown usage when comparing Rotoblator and CSI devices?

• A. CSI can treat multiple lumens with one crown
• B. Rotoblator has 1-1 lumen/crown; CSI can treat multiple lumens with one crown
• C. Rotoblator uses a larger lumen ratio
• D. CSI damages vessel while Rotoblator does not

Answer: (B)

The concept being tested is how many lumens a single crown can treat with these devices. The Rotablator uses a 1-to-1 relationship between lumen and crown, meaning one crown is sized for one lumen and is used for that lumen only. If you’re dealing with multiple lumens or branches, you’d typically need separate crowns or passes for each lumen. In contrast, the CSI device is designed so a single crown can address multiple lumens, allowing treatment across more than one lumen with one crown in a single pass. This difference affects planning for complex or multivessel lesions, procedure time, and tool selection. Therefore, the statement that Rotablator has a 1-1 lumen/crown relationship while CSI can treat multiple lumens with one crown best describes their lumen/crown usage.