A Cystotome needle knife is a specialized medical instrument used in endoscopic procedures, particularly for creating an opening in the gastrointestinal wall to access pancreatic pseudocysts or other fluid collections. 

Key Features of Cystotome Needle Knife
Design: The Cystotome is essentially a modified needle-knife papillotome.
Function: Used to electrosurgically puncture a hole in the transgastric or transduodenal wall to access pancreatic pseudocysts or other fluid collections.
Wire Guidance: Typically uses a wire guide (e.g., 0.035 inch) to ensure precise placement and control during the procedure.

Advantages
Minimally Invasive: Offers a less invasive alternative to surgical interventions, reducing recovery time and complications.
Effective Access: Provides reliable access for drainage of pancreatic pseudocysts, improving patient outcomes.

The Cystotome needle knife is a valuable tool in endoscopic procedures, enabling safe and effective access to pancreatic pseudocysts for drainage.