Endoscope

US4306546A · kind A · utility

Assignees

• Propper Manufacturing Co., Inc. · US
• HEINE Optotechnik GmbH & Co. KG · DE

Inventors

• Helmut A. Heine
• Werner E. Erfurt · Herrsching am Ammersee, DE
• Irving A. Speelman · East Williston, US

Key dates

• Filing date: Mar 26, 1980
• Grant date: Dec 22, 1981
• Expiry date: Mar 26, 2000

Classification

• Technology area (CPC A): Human Necessities
• CPC primary: A61B1/07
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

An endoscope includes a light conducting tube having an interior coating of a material having a lower index of refraction than the material of the tube so as to maintain total internal reflection in the light conducting material of the tube, the inner surface of the interior coating being prepared in such a way that unwanted light is prevented from entering the viewing passage.