(19)

(11)

EP 0 425 498 A1

(12)

(43) Date of publication: 08.05.1991 Bulletin 1991/19 (21) Application number: 89905147.0 (22) Date of filing: 20.04.1989

(51) International Patent Classification (IPC):  A61M 1/ 00( . ) (86) International application number: PCT/GB1989/000424 (87) International publication number: WO 1990/000908 (08.02.1990 Gazette 1990/04)

(84) Designated Contracting States: AT BE CH DE FR IT LI NL SE (30) Priority: 22.07.1988 GB 19880017509 02.09.1988 GB 19880020792 06.02.1989 GB 19890002555 (71) Applicant: MERCER, Lenox, Edward Broadfield, Crawley, Sussex (GB)	(72) Inventor: MERCER, Lenox, Edward Broadfield, Crawley, Sussex (GB) (74) Representative: Jenkins, Peter David, et al  PAGE WHITE & FARRER 54 Doughty Street London WC1N 2LS London WC1N 2LS (GB)