A Variety of Specialty Items Are Used for IR Procedures

A variety of specialty items are used for IR procedures.A Seldinger needle (18 gauge,2 3/4 inches) is commonly used for groin access.A sheath is commonly inserted at the arterial or venous puncture site.What is the function of the sheath?

A) To protect the puncture site and vessel from damage
B) To dilate the vessel and prevent backflow
C) To prevent thromboembolism development
D) To hold the guidewire and catheter in place