Patent ID: 8475410

Claim:
A cannula assembly for use with a medical therapy device having a trigger device comprising: a cannula module comprising: a skin-contacting surface for placing on an outer surface; and a cannula having a pre-operational state in which the cannula is retracted with respect to the skin-contacting surface, and an operational state in which the cannula projects beyond the skin-contacting surface; an inserter module coupled to the cannula module in the pre-operational state, the inserter module comprising: an inserter body having a bearing element formed thereon with an exterior surface and an interior surface; a plunger axially fixed to the cannula; an energy store on a first side is axially fixed on the interior surface of the bearing element and on an opposite side removably fixed to the plunger, the energy store having stored potential energy wherein when the energy store is at least partially discharged, the stored potential energy is transformed to kinetic energy that moves the cannula from the pre-operational state to the operational state; and an activation mechanism triggerable from outside the cannula assembly with the trigger device, the activation mechanism comprising a blocking element disposed along the exterior surface of the bearing element forming a trigger interface, wherein the activation mechanism prevents the energy store from being discharged before it is triggered by the trigger device, and enables the energy store to be discharge after it is triggered by the trigger device to force the cannula from the pre-operational state into the operational state.