(19)

(11)

EP 0 491 787 A1

(12)

(43) Date of publication: 01.07.1992 Bulletin 1992/27 (21) Application number: 90913726.0 (22) Date of filing: 13.09.1990

(51) International Patent Classification (IPC):  A61F 2/ 30( . ) A61F 2/ 00( . ) A61F 2/ 46( . ) A61F 2/ 36( . ) A61F 2/ 02( . ) (86) International application number: PCT/GB1990/001411 (87) International publication number: WO 1991/003992 (04.04.1991 Gazette 1991/08)

(84) Designated Contracting States: AT BE CH DE DK ES FR IT LI LU NL SE (30) Priority: 15.09.1989 GB 19890021008 (71) Applicant: WALKER, Peter Stanley Edgware, Middlesex HA8 7LH (GB)	(72) Inventor: WALKER, Peter Stanley Edgware, Middlesex HA8 7LH (GB) (74) Representative: Woodcraft, David Charles, et al  BROOKES & MARTIN High Holborn House 52/54 High Holborn London, WC1V 6SE London, WC1V 6SE (GB)