Electrically focused surgical light - uses multi-filament bulb for focussing or changing pattern size using remote control, and provides automatic intensity control

摘要

The multi-filament lamp combination may be used alone and in multi-lamp arrangements with other single and multi-filament lamps to provide pattern size variation from a large diameter flood effect to a smaller diameter spot effect. A spot/flood capability exists to provide large pattern exposure simultaneously with secondary spotlighting. The filaments can be energized selectively from a remote switching station so that the individuals who are scrubbed and gloved need not touch any part of the switching arrangement to change the lamp pattern size. A cluster of lights can contain one or more multi-filament lamps within the cluster, so that by switching on the rear most filament of the multi-filament lamps and switching off the single filament lamps, a small high intensity pattern is obtained by switching to the other filaments, a large pattern of high intensity is formed. More than two filaments can be provided in each lamp.