Drug injection device with deflectable transducer

Abstract

The present invention provides a drug injection device (″) comprising a first element () and a second element (″) configured to undergo movement relative to each other corresponding to an action performed on or by the drug injection device (″), wherein the first element () comprises serially disposed protrusions (), and wherein the second element (″) comprises a second element base and a deflectable transducer (″). The deflectable transducer (″) defines a base portion attached to the second element base, and a deflectable portion () configured for sequentially cooperating with the plurality of protrusions (), wherein a processor () is electrically connected with the deflectable transducer (″) to register activation signals. The deflectable transducer (″) comprises a carrier foil () that extends from the base portion to the tip end of the deflectable portion (), and a sensor element comprising a strain sensitive material () disposed on the carrier foil () and extending from the base portion towards the tip end of the deflectable portion (), wherein the carrier foil (), between the base portion and tip end of the deflectable portion (), comprises a non-supported portion having said strain sensitive material () disposed at least partly along the non-supported portion.