Patent ID: 8622955

Claim:
An external infusion device for infusing fluid into a person, comprising: a housing adapted to be carried on an exterior of the person; a reservoir contained in the housing; a drive mechanism contained in the housing and operatively coupled to the reservoir to deliver fluid from the reservoir into the person; a processor contained in the housing; an indicator operatively coupled to the processor and adapted to provide at least one of a visual indication, an audible indication, or a tactile indication to indicate information about the infusion device to the person; and an acceleration sensor coupled to the processor and adapted to provide an acceleration output signal as a function of acceleration forces acting on the housing, wherein the acceleration sensor is an impact switch disposed within the housing, the impact switch comprising: a switch electrical input, a switch electrical output, an electrically conductive seismic mass having a pivot end and a free end, the mass being electrically coupled to the switch electrical output and being pivotably mounted to the housing at the pivot end for movement in a first closing contact direction, a magnet electrical input, a magnet electrical output, and a first electromagnet electrically coupled to the switch electrical input and electrically coupled to the magnet electrical input and the magnet electrical output, the first electromagnet being adapted to generate a first magnetic field to releasably hold the free end of the mass, wherein the mass is adapted to move in the first closing contact direction and the first magnetic field generated by the first electromagnet is adapted to hold the free end of the mass such that a circuit between the switch electrical input and the switch electrical output is closed to provide the acceleration output signal when a first predetermined acceleration force acts on the housing, wherein the processor is adapted to control the infusion device in accordance with the acceleration output signal.