(19)

(11)

EP 0 506 811 A1

(12)

(43) Date of publication: 07.10.1992 Bulletin 1992/41 (21) Application number: 91901838.0 (22) Date of filing: 20.12.1990

(51) International Patent Classification (IPC):  A61B 5/ 053( . ) (86) International application number: PCT/GB1990/001991 (87) International publication number: WO 1991/009566 (11.07.1991 Gazette 1991/15)

(84) Designated Contracting States: BE DE ES FR IT NL SE (30) Priority: 21.12.1989 GB 19890028905 (71) Applicants: HOWELL, Martin John Gosport, Hampshire PO12 1BH (GB) PAYNE, Geoffrey John Gosport, Hampshire PO12 4RD (GB)	(72) Inventors: HOWELL, Martin John Gosport, Hampshire PO12 1BH (GB) PAYNE, Geoffrey John Gosport, Hampshire PO12 4RD (GB) (74) Representative: Brooks, Nigel Samuel  Hill Hampton East Meon Petersfield Hampshire GU32 1QN Petersfield Hampshire GU32 1QN (GB)