Absorbable line is:
① Intestinal line, taken from the small intestine of sheep or cattle, is divided into common type and chromium type. Ordinary catgut began to be absorbed in about 7 days, and now it is rarely used; Chromium catgut is gradually absorbed in about 14 ~ 2 1 day. At present, catgut suture is mainly used to suture the mucosal layer or whole layer and peritoneum of gastrointestinal tract, bladder, biliary tract and other internal organs. Using catgut in infected wounds can reduce sinus tracts that are difficult to heal due to other nonabsorbable sutures. However, the intestinal tract is a heterogeneous protein, and the tissue reaction is serious during absorption.
② Absorbent synthetic fibers, such as polyglycolic acid, polylactic acid glycolic acid, poly (p-dioxanone), polyvinyl acetate vinylon, etc. This kind of fiber tissue has light reaction, prolonged absorption time, sometimes up to more than one month, and may have antibacterial effect, so it is better than chrome sausage.
Nonabsorbable suture, commonly used are:
① Silk thread, the most commonly used suture in surgery, is characterized by small tissue reaction; Soft but not slippery, easy to knot and not easy to slip; Good tension, cheap and easy to obtain. But because it is not absorbed, it is a permanent foreign body, so try to choose thin lines.
(2) Non-absorbable synthetic fibers, such as nylon, nylon, polyester, polypropylene, etc., have the advantages of strong tensile force, light tissue reaction, little tissue damage, etc., and can be processed into extremely fine threads, which can be connected with sewing needles to make nondestructive sewing needles and threads for microsurgery and plastic surgery. (3) Metal wire, commonly used stainless steel wire, has small irritation and large pulling force, but the disadvantage is that it is not easy to knot, and it may be cut or embedded into tissues. At present, it is mostly used for bone fixation, fascia or tendon suture and so on. The tension-reducing suture of skin and deep mouth has been gradually replaced by thick nylon thread.