ALEXANDRIA, Va., Sept. 23 -- United States Patent no. 12,419,393, issued on Sept. 23.
"Painless slow-expanding piercing needle and method for using same" was invented by Biao Zeng (Hunan, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A painless slow-expanding piercing needle and a method for using same are disclosed. The painless slow-expanding piercing needle includes: a piercing needle with a diameter not greater than 0.3 mm; and a wire having a first end and a second end. The first end has a greater diameter than second end, the second end is connected to the piercing needle, and the first end is curled into a spiral tube shape. After piercing from one side to form a wound, the piercing needle is s...