Study Summary: This study investigates two types of dialysis catheters: *tunnel-cuffed* (a catheter with a protective tunnel and cuff) and *non-cuffed* (a simpler catheter without these features). Both are used in people needing hemodialysis, a treatment that cleans the blood when kidneys can't. The study looks at the rates of infection and other issues with each type. Eligibility: To join, you must be 18 years or older and need dialysis through the *right internal jugular vein* (a vein in the neck) because of conditions like *uremia* (a buildup of waste in the blood) or *AKI* (acute kidney injury). You cannot join if you have a history of vein problems, use other types of catheters, or take certain medications.

• The study involves comparing two catheter types for a short period.
• You must be on regular hemodialysis and meet specific health criteria.
• The study aims to see which catheter type has fewer complications.

Considerations: This study might help find a safer catheter option, but it requires regular dialysis and meeting health criteria.