ALEXANDRIA, Va., June 19 -- United States Patent no. 12,329,435, issued on June 17, was assigned to Candela Corp. (Marlborough, Mass.).

"Treatment apparatus" was invented by Gary Varshavsky (Natick, Mass.), Dmitry Gregoriev (Framingham, Mass.) and Doron Kopel (Zikhron Ya'akov, Israel).

According to the abstract* released by the U.S. Patent & Trademark Office: "A treatment apparatus includes a motorized subsystem in a handpiece housing having a rotating output shaft, an axial cam driven in rotation by the output shaft, and a push rod linearly driven by the axial cam. A cartridge is removably attachable to the handpiece housing and includes a cartridge housing, a needle assembly, a piston in the housing engaging the needle assembly and line...