(19)

(11)

EP 0 764 009 A1

(12)

(43) Date of publication: 26.03.1997 Bulletin 1997/13 (21) Application number: 96907567.0 (22) Date of filing: 18.03.1996

(51) International Patent Classification (IPC):  A61F 2/ 66( . ) A61F 2/ 00( . ) A61F 2/ 60( . ) A61F 2/ 76( . ) A61F 2/ 50( . ) A61F 2/ 80( . ) (86) International application number: PCT/GB1996/000640 (87) International publication number: WO 1996/029032 (26.09.1996 Gazette 1996/43)

(84) Designated Contracting States: BE DE DK ES FR IT NL SE (30) Priority: 17.03.1995 GB 19950005426 (71) Applicant: O'Byrne, Michael Abingdon, Oxon OX14 3RY (GB)	(72) Inventors: DIX, Colin New Marston, Oxford OX3 0EP (GB) PARSONS, Anthony, James Didcot, Oxon OX11 0PE (GB) STURCH, Rodney, Bruce, Edward Crowmarsh Gifford, Oxon OX10 8EU (GB) (74) Representative: Rock, Olaf Colin, et al  Rock and Company, Trelawn, Cassington Witney, Oxford OX8 1DN Witney, Oxford OX8 1DN (GB)