An infusion apparatus for infusing liquid into a patient having a housing, a pump disposed in the housing and adapted to pump liquid through a conduit, a visual display for generating messages to the user of the infusion apparatus, a backlight associated with the visual display, and a light sensor that...http://www.google.es/patents/US5637093?utm_source=gb-gplus-sharePatente US5637093 - Infusion pump with selective backlight
