(19)

(11)

EP 0 606 427 A1

(12)

(43) Date of publication: 20.07.1994 Bulletin 1994/29 (21) Application number: 93914910.0 (22) Date of filing: 09.07.1993

(51) International Patent Classification (IPC):  A61B 18/ 18( . ) (86) International application number: PCT/GB1993/001439 (87) International publication number: WO 1994/002204 (03.02.1994 Gazette 1994/04)

(84) Designated Contracting States: DE FR GB NL (30) Priority: 15.07.1992 GB 19920015042 (71) Applicant: MICROWAVE ENGINEERING DESIGNS LIMITED Newport, Isle-of-Wight PO30 5YL (GB)	(72) Inventors: THOMPSON, Alan Puckpool Hill, Ryde PO33 1PJ (GB) GRIST, Arron Ryde PO33 3BU (GB) (74) Representative: Moir, Michael Christopher, et al  Mathys & Squire 100 Grays Inn Road London WC1X 8AL London WC1X 8AL (GB)