(19)

(11)

EP 0 513 309 A1

(12)

(43) Date of publication: 19.11.1992 Bulletin 1992/47 (21) Application number: 92900778.0 (22) Date of filing: 10.12.1991

(51) International Patent Classification (IPC):  A61B 5/ 087( . ) G01P 5/ 18( . ) G01F 1/ 708( . ) (86) International application number: PCT/GB1991/002191 (87) International publication number: WO 1992/010725 (25.06.1992 Gazette 1992/14)

(84) Designated Contracting States: DE FR GB IT (30) Priority: 11.12.1990 GB 19900026860 27.03.1991 GB 19910006567 (71) Applicant: ABBEY BIOSYSTEMS LIMITED Whitland, Dyfed SA34 0LG (GB)	(72) Inventors: WALL, Peter Brookland Villa 75 Dunraven Place Ogmore Valley Mid Glamorgan CF32 7ET (GB) THOMAS, Anthony Awel-y-Foel Clos-y-Gafel Dyfed SAH1 3QL (GB) (74) Representative: Austin, Hedley William  Urquhart-Dykes & Lord Alexandra House 1 Alexandra Road Swansea West Glamorgan SA1 5ED Swansea West Glamorgan SA1 5ED (GB)