A Pennington clamp, also known as a Duval clamp, is a surgical clamp with a triangular eyelet. Used for grasping tissue, particularly during intestinal and rectal operations. Also used in some OB/GYN procedures, particularly caesarian section. Under the name 'Duval clamp' they are occasionally used much like a Foerster clamp to atraumatically grasp lung tissue. The clamp is named after David Geoffrey Pennington, an Australian surgeon who is a pioneer of microsurgeries.