(19)

(11)

EP 0 830 080 A1

(12)

(43) Date of publication: 25.03.1998 Bulletin 1998/13 (21) Application number: 96919898.0 (22) Date of filing: 24.05.1996

(51) International Patent Classification (IPC):  G01F 1/ 00( . ) A61B 5/ 087( . ) A61B 5/ 08( . ) (86) International application number: PCT/GB1996/001251 (87) International publication number: WO 1996/037147 (28.11.1996 Gazette 1996/52)

(84) Designated Contracting States: BE DE ES FR GB IT SE (30) Priority: 25.05.1995 ZA 19950004263 09.11.1995 ZA 19950009506 (71) Applicants: HARWILL INDUSTRIES (PTY) LIMITED Durbanville 7550, Cape Province (ZA) DUMMETT, Thomas Ian Peter Ipswich, Suffolk IP5 7SL (GB)	(72) Inventor: FOURIE, Pieter, Rousseau Eversdal, Cape Province (ZA) (74) Representative: Gemmell, Peter Alan, Dr.  Dummett Copp, 25 The Square, Martlesham Heath Ipswich, Suffolk IP5 3SL Ipswich, Suffolk IP5 3SL (GB)