(19)

(11)

EP 0 497 958 A1

(12)

(43) Date of publication: 12.08.1992 Bulletin 1992/33 (21) Application number: 91915682.0 (22) Date of filing: 27.08.1991

(51) International Patent Classification (IPC):  A61M 5/ 31( . ) A61M 5/ 315( . ) A61M 5/ 50( . ) (86) International application number: PCT/AU1991/000394 (87) International publication number: WO 1992/004064 (19.03.1992 Gazette 1992/07)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 29.08.1990 AU 19900002009 (71) Applicant: BUTLER, John Henry Adam Double Bay, NSW 2028 (AU)	(72) Inventors: BUTLER, John, Henry, Adam Double Way, NSW 2028 (AU) RICHARDSON, Alexander, Stewart Chatswood, NSW 2067 (AU) FORRESTER, Alan Hunter's Hill, NSW 2110 (AU) (74) Representative: Rickard, Timothy Mark Adrian  Brookes & Martin, High Holborn House, 52/54 High Holborn London WC1V 6SE London WC1V 6SE (GB)