(19)

(11)

EP 0 401 304 A1

(12)

(43) Date of publication: 12.12.1990 Bulletin 1990/50 (21) Application number: 89904842.0 (22) Date of filing: 11.04.1989

(51) International Patent Classification (IPC):  A61F 2/ 42( . ) A61F 2/ 00( . ) A61F 2/ 30( . ) A61B 17/ 68( . ) A61F 2/ 08( . ) A61F 2/ 46( . ) (86) International application number: PCT/GB1989/000368 (87) International publication number: WO 1989/009580 (19.10.1989 Gazette 1989/25)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 12.04.1988 GB 19880008577 (71) Applicant: Seedhom, Bahaa Botros Leeds West Yorkshire LS2 9HD (GB)	(72) Inventor: Seedhom, Bahaa Botros Leeds West Yorkshire LS2 9HD (GB) (74) Representative: Orr, William McLean, et al  URQUHART-DYKES & LORD 8th Floor, Tower House Merrion Way Leeds West Yorkshire, LS2 8PA Leeds West Yorkshire, LS2 8PA (GB)