Medical devices formed from high purity polyurethane

A method of making a medical device comprising:

• (a) performing a Michael addition reaction between H2C═C—CO—NH—(CH2)m—O—CO—NH—R—NH—CO—O—(CH2)m—NH—CO—C═CH2 and HS—R′—SH to form a poly(urethane amide of the formula (I):
• S—CH2—CH2—CO—NH—(CH2)m—O—CO—NH—R—NH—CO—O—(CH2)m—NH—CO—CH2—CH2—S—R′n (I);
• (b) performing a Michael addition reaction between H2C═C—CO—NH—(CH2)m—O—CO—NH—R—NH—CO—O—(CH2)m—NH—CO—C═CH2 and H2N—R′—NH2 to form a poly(urethane amide of the formula (II):
• NH—CH2—CH2—CO—NH—(CH2)m—O—CO—NH—R—NH—CO—O—(CH2)m—NH—CO—CH2—CH2—NH—R′n (II);
• or
• (c) performing a Michael addition reaction between H2C═C—CO—NH—(CH2)m—O—CO—NH—R—NH—CO—O—(CH2)m—NH—CO—C═CH2 and HO—R′—OH to form a poly(urethane amide of the formula (III):
• O—CH2—CH2—CO—NH—(CH2)m—O—CO—NH—R—NH—CO—O—(CH2)m—NH—CO—CH2—CH2—O—R′n (III);
• wherein m is an integer ranging from 1 to 20, n is an integer ranging from 1 to 1000, R is selected from C2-C20 aliphatic moieties, C6-C20 aromatic moieties, and C6-C20 cycloaliphatic moieties, and wherein R′ is selected from C2-C20 aliphatic moieties, polyether moieties, polycarbonate moieties, poly-epsilon-caprolactone moieties, polyolefin moieties, polyester moieties, polyoxazoline moieties and polyvinyl pyrrolidone moieties.