2024年7月30日 · Arterial access size: 4–5 French. Venous access size: 5–7 French. Percutaneous introducer sheath. Authors own image. There are dozens of catheters in the lab, few of which have intuitive names. It is easiest to think of them in three main categories: End-hole catheters, NIH catheters (no end-hole), and a ngiographic catheters.