ALEXANDRIA, Va., Oct. 28 -- United States Patent no. 12,446,862, issued on Oct. 21, was assigned to VIEW POINT MEDICAL INC. (Carlsbad, Calif.).

"Ultrasound marker detection, markers and associated systems, methods and articles" was invented by William Blair (San Diego).

According to the abstract* released by the U.S. Patent & Trademark Office: "Markers for use in bodily tissue take a variety of forms, and may include a plurality of ultrasound reflective elements, for example hollow shells filled with air, and a hydrogel that binds the ultrasound reflective elements. The hydrogel may be natural or artificial and may be cross-linked. An ultrasound system advantageously injects variance in a drive signal, that varies a frequency or phase of ...