Biocompatible polymers for medical devices

A polymer comprising at least one repeating unit having the structure:

• wherein,
• f is 0 or 1;
• X1, X2, X3, X4, X5, and X6 are independently selected from the group consisting of O, S and NR3 wherein R3 is selected from the group consisting of hydrogen and alkyl groups containing from one to six carbon atoms;
• Ar1 and Ar2 are independently selected from the group consisting of phenylene,
• optionally substituted with from one to four substituents independently selected from the group consisting of halogen, halomethyl, halomethoxy, methyl, methoxy, thiomethyl, nitro, sulfoxide, and sulfonyl;
• R1 and R2 are independently selected from the group consisting of optionally substituted alkylene, heteroalkylene, alkenylene and heteroalkenylene groups containing from one to ten carbon atoms;
• and
• B1 is selected from the group consisting of a carbonyl group, optionally substituted alkylene groups of 1 to 18 carbon atoms, and groups having the structure:
• wherein
• B2 is selected from the group consisting of optionally substituted alkylene, optionally substituted heteroalkylene, optionally substituted alkenylene and optionally substituted heteroalkenylene, or
• B2, X3, X4, X7 and X8 are selected so that
• defines a capped macromer structure;
• and
• D is selected from the group consisting of
• wherein
• R10 is selected from the group consisting of H, saturated and unsaturated, substituted and unsubstituted alkyl, heteroalkyl, alkenyl and heteroalkenyl groups containing from one to 18 carbon atoms, and
• R12 is selected from the group consisting of a bond, and saturated and unsaturated, substituted and unsubstituted alkylene, heteroalkylene, alkenylene and heteroalkenylene groups containing from one to 18 carbon atoms and alkylarylene, heteroalkylarylene, alkenylarylene and heteroalkenylarylene groups containing from three to 12 carbon atoms.