(19)

(11)

EP 0 759 732 A1

(12)

(43) Date of publication: 05.03.1997 Bulletin 1997/10 (21) Application number: 96905947.0 (22) Date of filing: 08.03.1996

(51) International Patent Classification (IPC):  A61F 2/ 60( . ) A61F 2/ 00( . ) A61F 2/ 64( . ) A61F 2/ 80( . ) A61F 2/ 76( . ) A61F 2/ 50( . ) A61F 2/ 66( . ) (86) International application number: PCT/GB1996/000560 (87) International publication number: WO 1996/029959 (03.10.1996 Gazette 1996/44)

(84) Designated Contracting States: BE DE DK ES FI FR IT NL SE (30) Priority: 10.03.1995 GB 19950004862 (71) Applicant: O'Byrne, Michael Abingdon, Oxon OX14 3RY (GB)	(72) Inventors: DIX, Colin Oxford OX3 0EP (GB) PARSONS, Anthony, James Didcot, Oxon OX11 0PE (GB) STURCH, Rodney, Bruce, Edward Oxon OX10 8EU (GB) (74) Representative: Rock, Olaf Colin  Rock and Company, Trelawn, The Green Cassington, Witney, Oxfordshire, OX8 1DN Cassington, Witney, Oxfordshire, OX8 1DN (GB)