polyamide enclosed in a sheath which give this suture the easy handling of a
braid, and the benefits of a monfilament.
dispensing cassettes are easy to work with.
Nonabsorbable sutures are made of materials which are not metabolized by
the body, and are used therefore either on skin wound closure, where the sutures
can be removed after a few weeks, or in some inner tissues in which absorbable
sutures are not adequate. This is the case, for example, in the heart and in
blood vessels, whose rhythmic movement requires a suture which stays longer than
three weeks, to give the wound enough time to close. Other organs, like the
bladder, contain fluids which make absorbable sutures disappear in only a few
days, too early for the wound to heal. Inflammation caused by the foreign
protein in some absorbable sutures can amplify scarring, so if other types of
suture are less antigenic (ie, do not provoke as much of an immune response) it
would represent a way to reduce scarring.
There are several materials used for nonabsorbable sutures. The most common
is a natural fiber, silk, which undergoes a special manufacturing process to
make it adequate for its use in surgery. Other nonabsorbable sutures are made of
artificial fibers, like polypropylene, polyester or nylon; these may or may not
have coatings to enhance their performance characteristics. Finally, stainless
steel wires are commonly used in orthopedic surgery and for sternal closure in