Activity monitoring device

摘要

A device for monitoring the activity of a user to prevent deep vein thrombosis when travelling on transportation vehicles. The device comprises a carrier ( 20 ) for positioning on or adjacent a user, a motion sensor ( 10 ) mounted on the carrier ( 20 ) and adapted to detect the user performing a predefined motion, processor adapted to filter the motion detected to remove background motion not attributable to the desired exercise and to reset a timer ( 12 ) when the predefined motion is detected. An alarm ( 14 ) is operated by the processor should the time period elapse without the exercise pattern being detected. The components are all contained in the carrier ( 20 ) which is preferably a small container that can be attached to a user's trousers or around the limb of a wearer. Failure to undertake the required motion will cause the alarm ( 14 ) to be activated, thus notifying the wearer of the omission.