Disclosed therein are instruments necessary for a surgical operation performed to keep a length of lengthened tissues, for instance, a raised nose on the face, using an improved thread embedded in a living body. More particularly, the present invention provides instruments for a fiber reinforced anti-compressive adherent suture method used to lengthen or separate soft tissues in the living body, which includes a tissue-implantable thread inserted into the living body by an injector needle and having wedge-shaped protrusions of different directionalities formed in two sections thereof, an injector for inserting the injector needle into the living body and moving it forwardly and backwardly, an instrument for inserting the tissue-implantable thread into the injector, and an instrument for vertically splitting an end of the thread to make the thread act in the living body.