(19)

(11)

EP 0 020 572 A1

(12)

(43) Date of publication: 07.01.1981 Bulletin 1981/01 (21) Application number: 79901505.0 (22) Date of filing: 16.11.1979

(51) International Patent Classification (IPC):  A61N 1/ 06( . ) (86) International application number: PCT/GB1979/000194 (87) International publication number: WO 1980/001045 (29.05.1980 Gazette 1980/12)

(84) Designated Contracting States: CH DE FR GB NL SE (30) Priority: 16.11.1978 GB 19440076778 (71) Applicant: BENTALL, Richard Hugh Cameron London W11 4PE (GB)	(72) Inventor: BENTALL, Richard Hugh Cameron London W11 4PE (GB)