Judkins left coronary cathter has a primary curve (distal) and a secondary curve. The tip of most diagnostic catheters taper to 5F regardless of the size of the catheter. The primary curve engages the coronary ostium while the secondary curve stabilises the catheter on the opposite wall of the aorta. The catheters are called after the secondary curves. JL3.5 catheter is Judkins left catheter with a 3.5 cm secondary curve (distance between primary and secondary curves, to be exact; also called as the catheter arm). Larger secondary curves are needed to engage a dilated aorta. The curves of this specimen has partly unfolded as it is a used one for disposal.
Prof. Dr. Johnson Francis MD, DM, FACC, FRCP Edin, FRCP London