ALEXANDRIA, Va., Sept. 24 -- United States Patent no. 12,740,919, issued on Sept. 22.
"Continuous needle ejection device" was invented by Junhao Wang (Hangzhou, China).
According to the abstract* released by the U.S. Patent & Trademark Office: "A continuous needle ejection device, comprising a pressing portion and a needle cartridge portion; the pressing portion comprises a striking needle and a housing assembly, and the striking needle is fixed to the housing assembly; a tail end of the needle cartridge portion is located inside the housing assembly, and the needle cartridge portion contains a needle assembly formed by a plurality of single needles arranged sequentially; a needle advancing portion possessing elastic potential energy is i...