Surgical nickel-titanium sutures are generally categorized into two main types: absorbable sutures and non-absorbable sutures!
Release Date:
11 Feb,2023
Surgical nickel-titanium sutures can generally be divided into two main categories: absorbable sutures and non-absorbable sutures! The video introduces the processing technology of medical nickel-titanium sutures.
Several extremely important main parameters of surgical nickel-titanium sutures: aperture, tensile strength, structure, coefficient of friction, knot security, and elasticity.
Nickel-titanium suture aperture.
Various suture thicknesses are indicated by the number of zeros; the more zeros, the thinner the suture. The unit for suture aperture is mm, usually represented by multiple zeros. The thinner the suture, the more zeros it has. For example, a 6-0 braided suture is thinner than a 4-0 nylon suture. However, the actual thickness depends on the raw material of the nickel-titanium suture.
Tensile strength.
The United States Pharmacopeia (USP) defines tensile strength as the force required to break a single suture strand. Therefore, tensile strength refers to a specific tensile force value, not a linear range. Reasonable tensile strength refers to the tensile strength after the suture is looped or knotted. The tensile strength of a knotted suture is about one-third that of an unknotted suture.
Structure.
Structure refers to whether the suture is monofilament (single strand) or multifilament (braided). Multifilament sutures are all woven. These sutures are easy to handle but increase the risk of tissue infection. Infection is easily caused because they have a capillary effect, allowing bacteria and viral contaminants to penetrate. Pathogens hidden in braided sutures can avoid phagocytosis by host cells. Therefore, monofilament sutures (polyester or polypropylene) are more suitable for surgical suturing of contaminated wounds. However, monofilament sutures are not easy to handle.
Coefficient of friction.
The coefficient of friction of a suture depends on how easily it passes through tissue. Sutures with a low coefficient of friction (such as polypropylene sutures) easily slide through tissue and are mainly used for skin suturing. The lower the coefficient of friction, the smoother the suture, and the easier the knot loosens. Therefore, when using polypropylene sutures, multiple knots are often required.
Knot security.
Knot security indicates the knot's resistance to loosening and is positively correlated with the suture's coefficient of friction. The higher the knot security, the lower the chance of wound dehiscence. Sutures with a high coefficient of friction have good knot security but exert greater pressure when passing through skin, making them harder to use.
Elasticity. Elasticity.
Elasticity refers to the suture's ability to restore its original size and shape after being stretched by wound swelling. Sutures with good elasticity (such as surgical nickel-titanium sutures) are less likely to cut through tissue during edema, do not loosen after swelling subsides, and reduce the chance of wound cracking.
Nickel-titanium suture manufacturers believe that nickel-titanium memory alloy wire is soft and can be bent freely at normal temperatures, which is beneficial for suturing; when the temperature exceeds 34°C, the nickel-titanium memory alloy wire exhibits shape memory under body temperature, stretching and generating continuous working pressure between the two wound edges; because the nickel-titanium memory alloy wire maintains superelastic mechanical support inside the body and automatically adjusts, moves synchronously, and continuously applies pressure during tissue swelling and subsidence, it reduces collagen deposition; in surgical suturing, it not only facilitates suturing but also improves the flatness of the incision after suturing, resulting in no hypertrophic scars after healing.
Keywords:
Nickel-titanium suture
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