(19)

(11)

EP 0 680 349 A1

(12)

(43) Date of publication: 08.11.1995 Bulletin 1995/45 (21) Application number: 92923916.0 (22) Date of filing: 25.11.1992

(51) International Patent Classification (IPC):  A61M 16/ 00( . ) (86) International application number: PCT/GB1992/002181 (87) International publication number: WO 1993/010844 (10.06.1993 Gazette 1993/14)

(84) Designated Contracting States: BE DE ES FR GB IT NL (30) Priority: 29.11.1991 GB 19910025467 (71) Applicant: CAMBRIDGE LIFE SYSTEMS LIMITED Cambridge CB2 1PH (GB)	(72) Inventors: MOCKRIDGE, Jeffrey, Nicholas, Anthony Cottenham Cambridgeshire CB4 4SD (GB) MORLEY, Colin, John Great Shelford Cambridge CB2 5EH (GB) (74) Representative: Brunner, Michael John  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)