The illuminated tongue depressor includes a handle having a battery-operated light source and a depressor blade selectively coupled with or uncoupled from the handle for discard and replacement. The blade includes a length extending longitudinally between a proximal end and a distal end and laterally...http://www.google.com.tw/patents/US5318009?utm_source=gb-gplus-share專利 US5318009 - Illuminated tongue depressor
