(19)

(11)

EP 0 020 643 A1

(12)

(43) Date of publication: 07.01.1981 Bulletin 1981/01 (21) Application number: 79901644.0 (22) Date of filing: 09.11.1979

(51) International Patent Classification (IPC):  A61B 5/ 0245( . ) A61B 5/ 024( . ) (86) International application number: PCT/US1979/000962 (87) International publication number: WO 1980/000912 (15.05.1980 Gazette 1980/11)

(84) Designated Contracting States: DE FR NL (30) Priority: 09.11.1978 GB 19430093478 24.05.1979 US 19790042046 (71) Applicant: SIGALOS, John L. Dallas, TX 75201 (US)	(72) Inventors: WALBEOFFE-WILSON, John H. Buckfastleigh, Devon (GB) LYNN-EVANS, Julian D. Chichester, Sussex (GB) WRIGHT, Patrick D. Woking, Surrey (GB) (74) Representative: Lavoix, Jean  c/o Cabinet Lavoix 2, Place D'Estienne D'Orves F-75441 Paris Cedex 09 F-75441 Paris Cedex 09 (FR)