ALEXANDRIA, Va., Sept. 30 -- United States Patent no. 12,426,991, issued on Sept. 30, was assigned to Beihang University (Beijing) and Peking Union Medical College Hospital (Beijing).

"Root canal fluid filling device and method" was invented by Chong Pan (Beijing), Yue Yu (Beijing), Yanpeng Liu (Beijing), Jiangsheng Wang (Beijing), Xinyu He (Beijing) and Jizhi Zhao (Beijing).

According to the abstract* released by the U.S. Patent & Trademark Office: "Disclosed are a root canal fluid filling device and method. The root canal fluid filling device includes a root canal filling device box, including an upper box body and a lower box body which are arranged in upper and lower partitions and detachable; a positive and negative pressure generati...