(19)

(11)

EP 0 438 555 A1

(12)

(43) Date of publication: 31.07.1991 Bulletin 1991/31 (21) Application number: 90911191.0 (22) Date of filing: 02.07.1990

(51) International Patent Classification (IPC):  A61B 6/ 03( . ) G01T 1/ 164( . ) (86) International application number: PCT/US1990/003722 (87) International publication number: WO 1991/000048 (10.01.1991 Gazette 1991/02)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB IT LI LU NL SE (30) Priority: 30.06.1989 US 19890375318 (71) Applicant: KAPLAN, H. Charles Chicago, IL 60613 (US)	(72) Inventor: KAPLAN, H. Charles Chicago, IL 60613 (US) (74) Representative: Fisher, Adrian John  CARPMAELS & RANSFORD 43 Bloomsbury Square London WC1A 2RA London WC1A 2RA (GB)