Surgical suture physical properties

Surgical suture diameter
As far as possible choose surgical suture the most basic principle is: use thin and large tension, surgical sutures in response to a minimum. Thickness of various surgical sutures in number with a null indicates that the larger the number says suture the coarse; Suture the diameter of the unit is mm, often represented by several 0. Surgical suture the thinner, the more the number 0. 6 0 nylon thread, for example, than 4 0 nylon thread is fine. But it actually depends on the thickness of surgical suture materials. Such as 5 0, same gut than polypropylene synthetic line (ProleneTM) thick. On the thickness selection principle is that under the condition of can withstand the wound tension, choose the surgical suture line as thin as possible.
Tensile strength
The national pharmacopoeia (USP) against intensity is defined as to be able to single surgical suture the minimum strength pulled apart or cause drag mark. So the tensile strength refers to a particular tension values, and the nonlinear range. Effective tensile strength refers to the suture knot around or after tensile strength. The same kind of stitching their tensile strength after the knot is the 1/3 of its not knot. In general, synthetic materials suture is relatively narrow seam under tensile strength, tendon surgical suture surgical suture than synthetic materials tensile strength.
Structure of the
Structure refers to the suture is single (monofil) or more shares (braided wire). Multi-strand stitches are woven. The stitching is easy to operate but can increase the infection and risk response. Is likely to cause infection because it has siphoned into bacteria, and foreign bodies. Bacteria hidden deep within the braided wire can evade host macrophage phagocytosis. Therefore, monofilament line (nylon or polypropylene) is more applicable to suture the wounds of the pollution. Monofilament line, however, is not easy to operation.
The coefficient of friction
Surgical suture of the friction coefficient to determine whether surgical suture is easy to through the organization. Low friction coefficient of the surgical suture (such as polypropylene suture) can easily slip organization, so intradermal suture is often used to do. The lower friction coefficient, stitching is more smooth, line is more easy to loose. Therefore, when using polypropylene suture, often need to make some more.
Line a knot firmly
Line knot strength is the minimum pull force directed line loose knot, is proportional to the stitching of the coefficient of friction. Knotting the intensity, the greater the possibility of wound dehiscence. High friction coefficient of surgical suture lines and good robustness, but through the skin when resistance is big, not easy to use.
The elastic
Elastic refers to surgical sutures in wound swelling will be able to reply to the original length after the stretching and the ability to form. Elastic good surgical suture (such as NovafilTM polybutene ester synthesis line), not easy to produce organization when tissue edema cutting, and edema subsided after also don't loose, the wound is not easy to crack.
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