W.c. Heraeus Gmbh

Peter Enders

Bernd Rudolph

Bruno Sebralla

Reinhard Luger

Hans J Bossler

Ingo Jaeckel

Geze Ambrus

Jorg Hartge

Jorg Boxhammer

Given is an operating light, with one or several spotlights, each with a light source, that is shielded by a counter reflector in the direction of radiation. The stream of light is focused by the counter reflector and a reflector onto an optical system closing off the housing in the direction of radiation. To guarantee a homogeneous illumination of deeper surgical wounds also, the optical system is structured as a Fresnel lens made up of annular prisms that contain a dioptric central region and a catadioptric edge (rim) region. The slope of the flanks and the height of the annular prisms are dimensioned such that the light beams emanating from the Fresnel lens cut the optical axis at a distance that is all the greater the shorter the distance with which the light beams emanate from the Fresnel lens is away from the optical axis.

Operating light

To provide for automatic adjustment of the light field of an operating room light in accordance with manual positioning of the light, an electrical servo control loop positions the respective lamps and/or deflection mirrors of circularly placed light sources (2) in the housing (1) to iluminate a given field in a given plane. The distance of the lamp from the given field is determined by an ultrasonic distance sensor (5; 5a, 5b, 5c) to provide one input to the servo loop, for comparison of the positioning of the light source to illuminate said field. If the distance of the illuminated field increases, the angular position of the light sources is automatically adjusted to provide the field at the increased distance. If the distance decreases, however, no adjustment is carried out unless an operator touches an operating handle. This is transformed into a manual readjustment signal which releases the servo system to then readjust the position of the light sources. A switch (33) is located in the control loop to interrupt the control loop and permit adjustment only upon an increase in distance. Thus, erroneous sensing of a smaller distance, for example given by the hands of a surgeon, surgical instrument, or the surgeon's head, will not affect repositioning of the lamp and the light sources therein.

Auto-adjustable operating room light

Growing community of inventors

Frankfurt-am-Main, Germany

Peter Enders