Patent ID: 6020917
Filing Date: 2000-02-01
Classification: A61B

Abstract:
A video display system for projecting an image of an endoscopic surgical field upon a screen in a sterile environment adjacent the surgical field so that an operator may simultaneously view the projected image surgical field and the surgical field, comprising:(a) an image gathering system for gathering the image of the surgical field;(b) a video projector operably connected to the image gathering system for projecting the image along an optical path, the image having a depth of focus extending along the optical path;(c) a projection optic disposed in the optical path so that the projected image passes through the projection optic, the projection optic having an optical axis tilted with respect to the optical path for tilting the projected image to dispose a focal plane non perpendicular to the optical path; and(d) a viewing screen intersecting the optical path, wherein a normal to the viewing screen is movable relative to the optical path between a parallel and a nonparallel intersecting orientation defining an offset angle;the offset angle and one of the non perpendicular focal plane and the depth of focus, selected so that the projected image displayed on the viewing screen has a substantially uniform focus across the viewing screen.