Angiographic catheters are made up of four main parts:
The guidewire is a thin hollow tube, which is inserted into the vascular system. It helps guide the other catheter parts into place, and remains in the body during the procedure.
The introducer sheath is a flexible tube that allows the catheter to be positioned at any angle during angiography. The introducer sheath also contains a balloon, which helps hold the catheter in place once it has been positioned.
The catheter itself can be straight or curved and has multiple lumens (openings) that allow for various types of injections or infusions.
The needle holder allows for access to blood vessels via an incision in the skin or groin.