(19)

(11)

EP 0 584 207 A1

(12)

(43) Date of publication: 02.03.1994 Bulletin 1994/09 (21) Application number: 92911568.0 (22) Date of filing: 11.05.1992

(51) International Patent Classification (IPC):  A61M 5/ 20( . ) (86) International application number: PCT/GB1992/000846 (87) International publication number: WO 1992/020388 (26.11.1992 Gazette 1992/29)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 13.05.1991 GB 19910103408 14.08.1991 GB 19910175612 (71) Applicant: STI INTERNATIONAL LIMITED Rochester, Kent ME2 4DP (GB)	(72) Inventor: WILMOT, John Glyndwr Nr. West Malling, Kent ME19 5RA (GB) (74) Representative: Lawrence, John  Barker, Brettell & Duncan, 138, Hagley Road, Edgbaston Birmingham B16 9PW Birmingham B16 9PW (GB)