(19)

(11)

EP 0 409 865 A1

(12)

(43) Date of publication: 30.01.1991 Bulletin 1991/05 (21) Application number: 89904190.0 (22) Date of filing: 23.03.1989

(51) International Patent Classification (IPC):  A61B 17/ 60( . ) (86) International application number: PCT/GB1989/000309 (87) International publication number: WO 1989/009031 (05.10.1989 Gazette 1989/24)

(84) Designated Contracting States: AT BE CH DE FR GB IT LI LU NL SE (30) Priority: 24.03.1988 GB 19880007026 (71) Applicant: SHEFFIELD CITY COUNCIL Sheffield S1 1UL (GB)	(72) Inventor: OLIVER, Albert, Edward Darfield Nr. Barnsley S73 9BP (GB) (74) Representative: Hulse, Thomas Arnold, et al  Hulse & Co. Eagle Star House, Carver Street Sheffield S1 4FP Sheffield S1 4FP (GB)