Use of barbed threads in facial rejuvenation（2）
Types of threads
A large number of manufacturing companies, pioneers of thread lift and surgeons worldwide have their own patents as to not only the design of the threads, but also the minor variations of method of deploying them. However, essentially, there are two types of barbed threads which are available. These are :
Bi-directional threads, with no anchoring points, inserted within a hollow needle and placed in such a manner that the thread cannot move either way because of the two-way direction of barbs fixing it nicely. Examples are the APTOS® threads.
Uni-directional barbed threads, which are anchored at a higher level fixation point. Examples are the Contour® and Silhouette® threads [Figure 2],[Figure 3].
Figure 2：Bi- directional Barbs（Courtesy APTOS®）
Figure 3：Uni-directional Cogs（Courtesy Silhouette®）
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