(19)

(11)

EP 0 636 040 A1

(12)

(43) Date of publication: 01.02.1995 Bulletin 1995/05 (21) Application number: 93910576.0 (22) Date of filing: 09.04.1993

(51) International Patent Classification (IPC):  A61M 5/ 14( . ) A61M 5/ 175( . ) A61M 5/ 152( . ) (86) International application number: PCT/US1993/003371 (87) International publication number: WO 1993/020885 (28.10.1993 Gazette 1993/26)

(84) Designated Contracting States: CH DE ES FR GB IT LI NL SE (30) Priority: 17.04.1992 US A 870553 19.03.1993 US A (71) Applicant: SCIENCE INCORPORATED Bloomington, MN 55437 (US)	(72) Inventors: KRIESEL, Marshall M. Bloomington, MN 54437 (US) THOMPSON, Thomas N. Bloomington, MN 54437 (US) (74) Representative: Waite, Anthony William, et al  MARKS & CLERK, Alpha Tower, Suffolk Street Queensway Birmingham B1 1TT Birmingham B1 1TT (GB)