(19)

(11)

EP 0 597 875 A1

(12)

(43) Date of publication: 25.05.1994 Bulletin 1994/21 (21) Application number: 92913850.0 (22) Date of filing: 04.06.1992

(51) International Patent Classification (IPC):  A61B 5/ 145( . ) A61B 5/ 024( . ) A61B 5/ 00( . ) A61B 5/ 1455( . ) (86) International application number: PCT/US1992/004654 (87) International publication number: WO 1992/021283 (10.12.1992 Gazette 1992/31)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU MC NL SE (30) Priority: 06.06.1991 US 19910711147 (71) Applicant: SOMANETICS CORPORATION Troy, MI 48083-4202 (US)	(72) Inventors: LEWIS, Gary, D. St. Clair Shores, MI 48081 (US) MESSING, Wayne, P. Troy, MI 48083 (US) STEWART, Melville, C., II Ann Arbor, MI 48103 (US) (74) Representative: Robinson, Anthony John Metcalf, et al  Kilburn & Strode 30 John Street London, WC1N 2DD London, WC1N 2DD (GB)