(19)

(11)

EP 0 466 756 A1

(12)

(43) Date of publication: 22.01.1992 Bulletin 1992/04 (21) Application number: 90905570.0 (22) Date of filing: 03.04.1990

(51) International Patent Classification (IPC):  A61B 5/ 055( . ) G01R 33/ 483( . ) G01R 33/ 48( . ) (86) International application number: PCT/GB1990/000494 (87) International publication number: WO 1990/012329 (18.10.1990 Gazette 1990/24)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 03.04.1989 GB 19890007493 (71) Applicants: DE CRESPIGNY, Alexander James Beckenham, Kent CB3 2SA (GB) CARPENTER, Thomas Adrian Cambridge, Cambridgeshire (GB) Hall, Laurance David Cambridge CB2 2QS (GB)	(72) Inventors: DE CRESPIGNY, Alexander James Beckenham, Kent CB3 2SA (GB) CARPENTER, Thomas Adrian Cambridge, Cambridgeshire (GB) Hall, Laurance David Cambridge CB2 2QS (GB) (74) Representative: Skone James, Robert Edmund, et al  GILL JENNINGS & EVERY Broadgate House 7 Eldon Street London EC2M 7LH London EC2M 7LH (GB)