(19)

(11)

EP 0 516 688 A1

(12)

(43) Date of publication: 09.12.1992 Bulletin 1992/50 (21) Application number: 91904767.0 (22) Date of filing: 25.02.1991

(51) International Patent Classification (IPC):  A61F 5/ 01( . ) A61F 5/ 02( . ) (86) International application number: PCT/GB1991/000291 (87) International publication number: WO 1991/012781 (05.09.1991 Gazette 1991/21)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 24.02.1990 GB 19900004225 (71) Applicant: Seton Healthcare Group plc Oldham Lancashire OL1 3HS (GB)	(72) Inventors: Burgoyne, Teresa, Mary Derbyshire DE7 6LP (GB) Harris, Monica, Bernadette Nottingham NG6 7PR (GB) (74) Representative: Funge, Harry  M'CAW & CO. 41-51 Royal Exchange Cross Street Manchester M2 7BD Manchester M2 7BD (GB)