ALEXANDRIA, Va., June 25 -- United States Patent no. 12,337,121, issued on June 24, was assigned to BIOTRONIK AG (Buelach, Switzerland).

"Catheter shaft and catheter and method for the production thereof" was invented by Felix Westhoff (Meilen, Switzerland) and Tobias Schaefer (Blumberg-Fuetzen, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "A catheter having a catheter shaft connected to a two-part connecting piece. The catheter shaft includes a first tube forming an inflation lumen and a second tube disposed at least partially within the first tube to form a second lumen. The first tube and the second tube terminate proximally at a same longitudinal position. An outer surface of the second tube is ...