(19)

(11)

EP 1 007 149 A1

(12)

(43) Date of publication: 14.06.2000 Bulletin 2000/24 (21) Application number: 98900581.4 (22) Date of filing: 12.01.1998

(51) International Patent Classification (IPC)7: A61N 1/20, A61N 1/32 (86) International application number: PCT/GB9800/087 (87) International publication number: WO 9831/420 (23.07.1998 Gazette 1998/29)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 16.01.1997 GB 9700875 (71) Applicant: BTG INTERNATIONAL LIMITED (Company No. 2664412) London EC4M 7SB (GB)	(72) Inventor: BTG INTERNATIONAL LIMITED (Company No. 2664412) London EC4M 7SB (GB) (74) Representative: Simpson, Paul Christopher  BTG International Ltd10 Fleet PlaceLimeburner Lane London EC4M 7SB London EC4M 7SB (GB)