“…[1][2][3][4] Various types of threads with special designs have recently been invented to attain more reliable and sustained effects or enable minimally-invasive access to the implant. [5][6][7][8] Among the most frequently-utilized materials are cog-type-or barbed-threads (eg, APTOS, Kolster Methods Inc., Corona, California), which have short "wings" projecting from the thread stalk and extending throughout the thread. The durability of each cog thread is thought to result from mechanical force as well as tissue reactions (eg, capsule formation) around the implanted thread.…”