(19)

(11)

EP 0 263 124 A1

(12)

(43) Date of publication: 13.04.1988 Bulletin 1988/15 (21) Application number: 87901591.0 (22) Date of filing: 13.03.1987

(51) International Patent Classification (IPC):  A61F 5/ 56( . ) (86) International application number: PCT/GB1987/000180 (87) International publication number: WO 1987/005494 (24.09.1987 Gazette 1987/21)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 13.03.1986 GB 19860006197 (71) Applicant: SCIENTIFIC APPLIED RESEARCH (SAR) PLC. Middlesex HA2 OLS (GB)	(72) Inventor: JOHNSON, William, Nevil, Heaton Hampstead London NW3 (GB)