Final answer:
The dialysis vascular access in question is a venous catheter used for immediate hemodialysis, with a high infection risk and low function.
Step-by-step explanation:
The type of vascular access for dialysis being described is likely the use of a venous catheter, a thin, flexible tube inserted into a large vein, often in the neck, which can be used immediately for hemodialysis.
This method, while providing immediate access, poses the highest risk for infections and generally has the poorest function compared to other forms of dialysis access like arteriovenous fistulas or grafts.
During the process of hemodialysis, a dialyzer removes waste products such as urea from the blood through a semipermeable membrane, mimicking kidney functions for patients with renal failure.