(19)

(11)

EP 0 485 450 A1

(12)

(43) Date of publication: 20.05.1992 Bulletin 1992/21 (21) Application number: 90911809.0 (22) Date of filing: 01.08.1990

(51) International Patent Classification (IPC):  A61F 9/ 00( . ) A61F 9/ 008( . ) A61B 3/ 135( . ) A61B 18/ 20( . ) (86) International application number: PCT/GB1990/001196 (87) International publication number: WO 1991/001703 (21.02.1991 Gazette 1991/05)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 01.08.1989 GB 19890017569 (71) Applicant: SCIENTIFIC GENERICS LTD Cambridge , CB4 2PF (GB)	(72) Inventor: RAVEN, Anthony Melbourne Royston Herts SG8 6BN (GB) (74) Representative: Davies, Christopher Robert  Frank B. Dehn & Co. Imperial House 15-19 Kingsway London WC2B 6UZ London WC2B 6UZ (GB)