Johns Hopkins Bulldog Clamp; Straight; 800 Grams Pressure; 2" Length The Bulldog clamp is a useful instrument for stopping blood flow to a particular organ of interest. One of the most common applications where a bulldog clamp can be used is during coronary surgery where blood flow must be stopped. In general the bulldog clamp, with its many angled varieties and surgical applications, is an essential tool during surgery where blood flow to an organ must be stopped or controlled. Not for human use