A lancing device includes a housing, a moveable lancet holder configured to hold a lancet, and a launching mechanism. The launching mechanism includes a launch spring and retraction spring, at least one of which has been at least partially coated with a dampening material that aids in dampening sound...http://www.google.es/patents/US20070173876?utm_source=gb-gplus-sharePatente US20070173876 - Lancing device with dampened spring
