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外科缝线基础知识（Basics of surgical sutures）
Surgical sutures are necessary materials for surgeons, and download this knowledge from other websites in the hope that they will be uful to you
beat it是什么意思Ideal stitching materials shall meet the following conditions:
1. versatility, which can be applied to any surgical procedure (of cour, taking into account the differences in stitch type and tensile strength);
2. sterility;
3., no electrolysis, no capillary action, no allergy and no carcinogenicity;
4. if stainless steel suture, must have no magnetism;
5. easy to operate;
6., the tissue reaction is slight, is not conducive to bacterial growth;
7. do not loon the knot, the suture itlf does not wear or split;
just a dream
pride是什么意思8. does not shrink within the tissue;
9. suture after the arrival of, can be absorbed, and only minor reactions.
However, becau of this ideal versatility, sutures do not currently exist, so surgeons must choo sutures that are as clo as possible to the ideal and have the following characteristics:
1., tensile strength uniform, in order to u the finer type of suture;
The diameter of the 2. sutures is uniform and constant;
3. sterility;
4. strong flexibility, easy to operate, safe ligation;
5. does not contain irritating substances or impurities to facilitate tissue compatibility;
6. suture results can be trusted.
Model and tensile strength
The model indicates the diameter of the stitching material. Surgical practice is generally accepted that the finest type of suture that allows tissue to fit safely should be lected to minimize the suture induced trauma. The number of stitches is indicated by numbers: "No. 0" or more. The larger the number, the thicker the am, such as "No. 3 is thicker than 1"; from "0", "0", the smaller the diameter, the lower the tensile strength.
the crushThe tensile strength of a suture is what it can withstand before
breaking (expresd in pounds). The tensile strength of the tissue is a prerequisite for the surgeon to lect the type of suture and the tensile strength. The surgeon should also understand, thread strength decreasing and the relationship between the tensile strength increasing wound resistance between the implant materials and whether caud by foreign body reaction affect the healing process of the organization. It is generally accepted that the tensile strength of the suture does not exceed the tensile strength of the tissue, but at least it should be stronger than the normal tissue.
忘记英文Single fiber and multi fiber suture
The single fiber suture is made of a single fiber, which is less resistant to passing through the tissue and prevents bacteria from sticking. Becau of the characteristics, it is especially suitable for vas
cular surgery. Single fiber sutures are easy to tie. But in operation and ligation must be careful, becau folding or curling may cau suture gap or weak point, so that fracture.
stonewallAbsorbable and non absorbable sutures
Absorbable sutures are prepared from the collagen or synthetic multimeric system of healthy mammals. Natural absorbable suture is through the human digestive enzymes to degrade fiber suture. The synthetic absorbable suture is first through hydrolysis, decomposition of the water gradually penetrated into the suture fiber caud by the polymer chain; and natural absorbable suture than synthetic absorbable sutures can be hydrolyzed after implantation only caud mild tissue
reaction.
In the first pha of suture absorption, tensile strength showed a linear and gradual decrea, which occurred within a few weeks after surgery. The cond stage often overlaps with the first stage, and eventually the suture disappears.
An absorbable suture that is free of enzyme digestion and hydrolysis. Its scope of application is as follows:
The skin should be removed after the wound is healed;
The suture in the body, leaving the length inside the tissue;
Suitable for allergic, scar, or organized hypertrophy of absorbable sutures;
A temporary device ud to cure a defibrillator, pacemaker, or drug relea device.
Introduction of various suture materials
Natural absorbable suture
Surgery can be divided into: catgut catgut and chromic catgut in general. Both are procesd from highly purified collagen. Surgical catgut absorption rate depends on the type of line, organizational type and condition as well as the patient's general condition. Can be ud for surgical catgut suture wound infection, but the absorption rate.
少儿英语在线General surgical catgut fast absorption. Postoperative tensile strength was maintained for only 7-10 days and was completely absorbed within 70 days. The chromate solution catgut called chrome catgut, digestive enzymes function against the body, the absorption time is extended to more than 90 days.
Synthetic absorbable wing money
Becau the natural gut has strong antigenicity, tissue reaction and the disadvantage of receiving rate are people, is committed to the development of synthetic absorbable sutures. The latter has a wide range of applications, ranging from thoracic and abdominal wound sutures to ophthalmic surgery.
Coated Vicryl (Polyglactin 910) suture: it has the advantage of:
deepfreeze1. smooth through tissue;
2. knot smooth, accurate positioning;
3. reduce the tendency to clamp tissue;
4. can be ud to stitch infected wounds.
The coating is PLLA and ethylene to lipid (Polyglactin 370) copolymer mixture made with calcium stearate. The coating has remarkable absorbability, adhesion and lubricity without stripping.
园林设计培训
The tensile strength of the coated Vicryl suture remained about
