Polyamide monofilament suture manufactured from higher order polyamide

A polyamide monofilament suture manufactured from a fiber-forming polyamide homopolymer or copolymer possessing a substantial number of units selected from the group consisting of units of the structure in which n is at ##STR5## at least about 7 and units of the structure ##STR6## in which R.sup.1 is an aliphatic group of from about 4 to about 20 carbon atoms, a cycloaliphatic group of from about 6 to about 20 carbon atoms or an aromatic group of from about 6 to about 20 carbon atoms and R.sup.2 is an aliphatic, cycloaliphatic or aromatic group of from about 6 to about 20 carbon atoms, provided, R.sup.1 contains at least 6 carbon atoms when R.sup.2 is an aliphatic group of 6 carbon atoms or R.sup.2 contains at least 8 carbon atoms when R.sup.1 contains 4 carbon atoms, provided, that where the polyamide is a copolymer, any units other than the aforesaid units which may be present contain a carbonyl, the suture being manufactured from the polyamide by an extrusion process which comprises the steps of extruding the polyamide resin at an extrusion temperature of from about 180.degree. to about 290.degree. C. to provide a monofilament, stretching the solidified monofilament at a temperature of from about 40.degree. to about 98.degree. C. in liquid medium or at from about 50.degree. to about 185.degree. C. in gaseous medium at a stretch ratio of from about 3:1 to about 5:1 to provide a stretched monofilament and annealing the stretched monofilament at a temperature of from about 100.degree. to about 240.degree. C. to provide the finished suture, the annealing resulting in shrinkage of the stretched monofilament for a recovery to within about 80% to about 97% of the length of the monofilament prior to annealing, said monofilament having a decreased 0-5% energy compared to a cold-drawn monofilament of the same size and composition.