(19)

(11)

EP 0 567 524 A1

(12)

(43) Date of publication: 03.11.1993 Bulletin 1993/44 (21) Application number: 92903238.0 (22) Date of filing: 17.01.1992

(51) International Patent Classification (IPC):  A61M 13/ 00( . ) A61M 15/ 00( . ) (86) International application number: PCT/GB1992/000096 (87) International publication number: WO 1992/012749 (06.08.1992 Gazette 1992/21)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL PT SE (30) Priority: 18.01.1991 GB 19910001174 (71) Applicant: FISONS plc Ipswich Suffolk IP1 1QH (GB)	(72) Inventor: HART, John, Leck Nottingham NG9 3BB (GB) (74) Representative: Wright, Robert Gordon McRae  FISONS plc 12 Derby Road Loughborough Leicestershire LE11 0BB Loughborough Leicestershire LE11 0BB (GB)