Thompson Carotid Closure ClampDDP Elite USA Thompson Carotid Closure Clamp is an instrument made for use in cardiothoracic surgical procedures. Although it lends itself to a wide variety of applications it is particularly useful in carotid closure. Many cardiothoracic surgical procedures necessitate a large amount of clamping and cross clamping to ensure blood flow is occluded in the regions where it is necessary and this clamp is designed for these types of situations.