(19)

(11)

EP 0 621 760 A1

(12)

(43) Date of publication: 02.11.1994 Bulletin 1994/44 (21) Application number: 93902396.0 (22) Date of filing: 15.01.1993

(51) International Patent Classification (IPC):  A61B 5/ 0408( . ) A61B 5/ 042( . ) A61B 5/ 0492( . ) A61B 19/ 00( . ) A61B 5/ 0402( . ) A61B 5/ 0478( . ) A61B 18/ 02( . ) (86) International application number: PCT/GB1993/000096 (87) International publication number: WO 1993/013708 (22.07.1993 Gazette 1993/18)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE (30) Priority: 15.01.1992 GB 19920000838 (71) Applicant: CRYOGENIC TECHNOLOGY LIMITED Belper, Derbyshire DE5 1UU (GB)	(72) Inventors: CLARKE, Brian, Kevin, Roderick Oakwood Derby DE2 2JL (GB) SAUMAREZ, Richard, Charles Belper Derbyshire DE5 1UU (GB) (74) Representative: Swindell & Pearson  48 Friar Gate Derby DE1 1GY Derby DE1 1GY (GB)