(19)

(11)

EP 0 345 300 A1

(12)

(43) Date of publication: 13.12.1989 Bulletin 1989/50 (21) Application number: 88903302.0 (22) Date of filing: 14.04.1988

(51) International Patent Classification (IPC):  G01R 33/ 381( . ) G01R 33/ 38( . ) A61B 5/ 055( . ) G01R 33/ 3873( . ) (86) International application number: PCT/GB1988/000286 (87) International publication number: WO 1988/008126 (20.10.1988 Gazette 1988/23)

(84) Designated Contracting States: DE FR GB IT NL (30) Priority: 15.04.1987 GB 19870009004 15.04.1987 GB 19870009005 (71) Applicant: OXFORD ADVANCED TECHNOLOGY LIMITED Osney Mead, Oxford OX2 0DX (GB)	(72) Inventors: McDOUGALL, Ian, Leitch Oxon (GB) BROWN, Ian, Jesse Nutsford, Cheshire (GB) BEGG, Michael, Upper Heyford OX5 3LE (GB) (74) Representative: Skone James, Robert Edmund, et al  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)