Patent 7235052 was granted and assigned to BTG International Limited on June, 2007 by the United States Patent and Trademark Office.
Ultrasound detectable instrument including a bubble generator having two elements which, upon contact with each other in the presence of a fluid, react with each other to produce gas bubbles which may be detected by sonic imaging equipment. The two elements comprise first and second radially displaced layers of the elements within a fluid permeable carrier material.