Polyglycolic
Acid
Dexon (Davis
and Geck)
This is a synthetic polymer of
glycolic acid. The strands are made by extrusion as fine threads which are then
braided to form a uniform gauge thread of seven sizes from 0.7 to 4.
Polyglycolic acid sutures are extremely inert and cause minimal tissue
reaction.
Compared
with catgut they are stronger, do not fray and are not slippery when knotting.
The sutures are sealed in two coverings and sterilized by a two-stage ethylene
oxide process. With this method, the inner envelop is sterilized before
sealing. Gas sterilizes the outer envelop to complete sterilization, because of
the increased strength compared with catgut, in use of Dexon and other sythetic
absorbables generally a size smaller than for catgut can be used with safety.
Polyglyconate
Maxon (Davis
and Geck)
This is a monofilament synthetic absorbable
suture prepared from a copolymer of glycolic acid and trimethylene carbonate.
The process of absorption is by nonenymatic hydrolysis. Approximately 70% of
the original suture strength remains 2 weeks after implantation, and
approximately 55% of the original suture strength remains 3 weeks after
implantation. Absorption is completed 6 months after implantation.
Maxon
is available in sizes 0.7 (6/0)-3 (2/0)(Clear), and sizes 1(5/0)04(1)(Green),
mounted on atraumatic needles.
Polyglactin
910
Vicryl is a pliable, smooth fiber, which is made in
nine sizes from 0.3 to 5. Date from implantation studies show that more than
55% of the original strength remains at 14 days, and over 20% at 21 days.
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