Bulldog Clamp Curved 1×2 Rows Nontraumatic Fine Teeth, Thumb Cross Action, DeBakey Atraumatic Bulldog Clamp is a small cross-action thumb clamp used for halting blood flow in a vessel. They are most commonly used in cardiovascular or cardiothoracic procedures. They are available curved or straight, in multiple lengths. This product is straight with 1×2 rows of fine, atraumatic teeth and a length of 78 mm – 114 mm.