(19)

(11)

EP 0 047 744 A1

(12)

(43) Date of publication: 24.03.1982 Bulletin 1982/12 (21) Application number: 80902394.0 (22) Date of filing: 12.12.1980

(51) International Patent Classification (IPC):  A61M 5/ 28( . ) A61M 5/ 32( . ) (86) International application number: PCT/GB1980/000215 (87) International publication number: WO 1981/001657 (25.06.1981 Gazette 1981/15)

(84) Designated Contracting States: CH DE FR GB LI SE (30) Priority: 12.12.1979 GB 19790042882 (71) Applicant: NATIONAL RESEARCH DEVELOPMENT CORPORATION London SE1 6BU (GB)	(72) Inventors: TURNER, Robert Charles Great Milton Oxfordshire (GB) HOLMAN, Rury Reginald Farmoor Oxfordshire (GB)