Surgical Suture Physical Properties
Oct 10, 2018


Stitch diameter

The most basic principle of using sutures is to use sutures that are thin and have a large pulling force and minimal reaction to the tissue. The thickness of various sutures is indicated by the number and the zero number. The larger the number, the thicker the suture; the diameter of the suture is in millimeters, often expressed by a few zeros. The finer the stitch, the more the number of 0. For example, six 0 nylon threads are thinner than four 0 nylon threads. But the actual thickness depends on the material of the suture. For example, the same five 0, the gut is thicker than the polypropylene synthetic line (ProleneTM). The principle of choice regarding the thickness is to select the smallest possible stitching under conditions that can withstand the tension of the wound.


Tensile strength

The US National Pharmacopoeia (USP) definition of tensile strength is the minimum force that can break a single suture. Therefore, tensile strength refers to a specific tension value, and a nonlinear interval. Effective tensile strength refers to the tensile strength of the stitch after winding or knotting. The tensile strength of the same type of suture after knotting is 1/3 of its unknotted. In general, synthetic material sutures have greater tensile strength than sheep intestine sutures, and tendon sutures have greater tensile strength than synthetic sutures.


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