(19)

(11)

EP 0 938 274 A1

(12)

(43) Date of publication: 01.09.1999 Bulletin 1999/35 (21) Application number: 97911329.0 (22) Date of filing: 04.11.1997

(51) International Patent Classification (IPC):  A61B 5/ 11( . ) G01P 13/ 00( . ) A61B 5/ 113( . ) (86) International application number: PCT/GB1997/003024 (87) International publication number: WO 1998/019596 (14.05.1998 Gazette 1998/19)

(84) Designated Contracting States: AT BE CH DE DK ES FI FR GB GR IE IT LI NL PT SE (30) Priority: 06.11.1996 GB 19960023077 (71) Applicant: Movement Control Systems Limited London WIR 9AJ (GB)	(72) Inventors: SMITH, Derek, Travers Kent BR7 6RQ (GB) RUSSELL, Brian, Eric London SE9 4HZ (GB) ROSS, Keith, Alexander Gloucester GL4 0TJ (GB) GIBBON, Paul, William Herts AL3 5LW (GB) (74) Representative: Regan, Heather, et al  Harrison Goddard Foote 1 Stockport Road GB-Stockport SK6 6BD GB-Stockport SK6 6BD (GB)