Patent ID: 7306625

Claim:
A kit comprising a balloon catheter comprising a balloon at or near its distal end, and a stent mounted on the balloon, wherein the exterior surface of the balloon and stent are provided with a coherent coating comprising a film-forming polymer, in which the polymer is formed from ethylenically unsaturated monomers including a zwitterionic monomer of the general formula I: YBX I wherein B is a straight or branched alkanediyl, alkyleneoxaalkylene or alkylene oligo-oxaalkylene chain optionally containing one or more fluorine atoms up to and including perfluorinated chains or, if X or Y contains a terminal carbon atom bonded to B, a valence bond; X is a zwitterionic group; and Y is an ethylenically unsaturated polymerizable group selected from the group consisting of CH 2 ═C(R)—CH 2 —O—, CH 2 ═C(R)—CH 2 OC(O)—, CH 2 ═C(R)OC(O)—, CH 2 ═C(R)—O—, CH 2 ═C(R)CH 2 OC(O)N(R 1 )—, R 2 OOCCR═CRC(O)—O—, RCH═CHC(O)O—, RCH═C(COOR 2 )CH 2 —C(O)—O—, wherein: R is hydrogen or a C 1 -C 4 alkyl group; R 1 is hydrogen or a C 1 -C 4 alkyl group or R 1 is —B—X where B and X are as defined above; and R 2 is hydrogen or a C 1-4 alkyl group; A is —O— or —NR 1 —; K is selected from the group consisting of —(CH 2 ) p OC(O)—, —(CH 2 ) p C(O)O—, —(CH 2 ) p OC(O)O—, —(CH 2 ) p NR 3 —, —(CH 2 ) p NR 3 C(O)—, —(CH 2 ) p C(O)NR 3 —, —(CH 2 ) p NR 3 C(O)O—, —(CH 2 ) p OC(O)NR 3 —, —(CH 2 ) p NR 3 C(O)NR 3 — (in which the groups R 3 are the same or different), —(CH 2 ) p O—, —(CH 2 ) p SO 3 —, and, in combination with B, a valence bond p is from 1 to 12; and R 3 is hydrogen or a C 1 -C 4 alkyl group.