(19)

(11)

EP 0 040 635 A1

(12)

(43) Date of publication: 02.12.1981 Bulletin 1981/48 (21) Application number: 81900121.0 (22) Date of filing: 25.11.1980

(51) International Patent Classification (IPC):  A61B 17/ 00( . ) (86) International application number: PCT/US1980/001573 (87) International publication number: WO 1981/001508 (11.06.1981 Gazette 1981/14)

(84) Designated Contracting States: AT CH DE FR GB LI SE (30) Priority: 26.11.1979 US 19790097192 (71) Applicant: NORSEN, Robert A. Seattle, WA 98136 (US)	(72) Inventor: NORSEN, Robert A. Seattle, WA 98136 (US)