1.1 This specification covers requirements for the disclosure of specific characteristics of screw-type adjustable clamps that are designed for the gradual permanent occlusion of carotid arteries. These devices consist of an implantable por This specification covers requirements for the disclosure of specific characteristics of screw-type adjustable clamps that are designed for the gradual permanent occlusion of carotid arteries. These devices consist of an implantable portion and an exte