Thursday, November 7, 2013

SUTURES & LIGATURES 3 Synthetic absorbables



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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