ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,232,921, issued on Feb. 25, was assigned to SHENZHEN SUPERLINE TECHNOLOGY Co. LTD. (Guangdong, China).

"Root canal therapy device with mechanical vibration mode and rotation drive mode" was invented by Zhong Wang (Guangdong, China) and Jing Song Zhou (Guangdong, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "A root canal therapy device with a mechanical vibration mode and a rotation drive mode includes a head, a handle, a first flexible drive shaft and a second flexible drive shaft. The head includes an outer main part, a mandrel part for mounting a root canal file, a first drive input shaft part and a second drive input shaft part. The mandrel pa...