(19)

(11)

EP 0 650 381 A1

(12)

(43) Date of publication: 03.05.1995 Bulletin 1995/18 (21) Application number: 93916077.0 (22) Date of filing: 14.07.1993

(51) International Patent Classification (IPC):  A61B 5/ 0402( . ) A61B 5/ 046( . ) A61N 1/ 365( . ) A61B 5/ 0452( . ) A61N 1/ 362( . ) (86) International application number: PCT/GB1993/001484 (87) International publication number: WO 1994/002201 (03.02.1994 Gazette 1994/04)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 23.07.1992 GB 19920015680 (71) Applicant: CRYOGENIC TECHNOLOGY LIMITED Belper, Derbyshire DE5 1UU (GB)	(72) Inventor: SAUMAREZ, Richard Charles, Cryogenic Techn. Ltd. Belper, Derbyshire DE5 1UU (GB) (74) Representative: Drever, Ronald Fergus  Swindell & Pearson 48, Friar Gate Derby DE1 1GY Derby DE1 1GY (GB)