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The Physical Properties Of Silk Suture
Mar 25, 2018

Suture diameter

The most basic principle of suture is to use the stitches with the smallest tension and the smallest response to the tissue. The thickness of the various stitches is indicated by the number and number of Numbers. The larger the number, the thicker the suture. The diameter of the suture is in millimeters and is often represented by several zeros. The thinner the suture, the more of 0. For example, six zero nylon lines are thinner than four zeros. But the actual thickness depends on the material of the suture. For example, the same 5 0's, the gut is thicker than the polypropylene line (ProleneTM). The principle of choice for thick and thin is to choose the suture line as fine as possible under the condition of being able to withstand wound tension.

Tensile strength

The U.S. national pharmacopoeia (USP) is defined as the minimum strength to pull a single suture. So tensile strength is a specific tension value, and a nonlinear interval. The effective tensile strength refers to the tensile strength of the suture wound or the knot. The tensile strength of the same suture is one third of its unknotted strength. In general, the suture of synthetic materials is stronger than that of the suture, and the tendons are stronger than those of synthetic materials.


Structure refers to a single strand (single strand) or multiple strands (braid). Many sutures are knitted. This suture is easy to operate but increases the chances of infection and tissue response. It is easy to cause infection because of its siphoning, which causes bacteria and foreign bodies to infiltrate. Bacteria deep inside the knitting line can escape from the host macrophages. Therefore, monofilament (nylon or polypropylene) is more suitable for stitching contaminated wounds. However, single wire is not easy to operate.

The coefficient of friction

The friction coefficient of the suture determines whether the stitching is easy to pass through the tissue. Sutures with low friction coefficient (such as polypropylene suture) can slip through tissue easily, so they are often used for leather sutures. The lower the friction coefficient, the smoother the suture and the easier the knot. Therefore, when using polypropylene suture, a few more knots are often required.

The knot is firm.

The line knot strength is the minimum pulling force that makes the knot loose, which is proportional to the friction coefficient of the suture. The greater the strength of the line, the less likely the wound will open. The friction coefficient is high in stitching, but it is difficult to use when passing through the skin.

The elastic

Elasticity refers to the ability of a suture to recover its length and form when the wound is swollen and elongated. Sutures with better elasticity (such as NovafilTM polybutadiene) are difficult to cut during tissue edema, and the edema is not loose after edema, and the wound is not easy to crack.