The present disclosure relates to a medicament delivery device comprising: a housing (3), a plunger rod received by the housing (3), which plunger rod is rotatable in a first direction relative to the housing (3) and linearly displaceable, an activation button arrangement linearly displaceable from a first position to a second position to thereby rotate the plunger rod in the first direction, a second direction rotation preventer having an annular outer member that is rotationally fixed relative to the housing (3) and an annular inner member partially received by the outer member, wherein the outer member and the inner member are arranged to receive the plunger rod and wherein the inner member is rotationally interlocked with the plunger rod, wherein the outer member and the inner member are structured to allow the inner member to rotate in the first direction relative to the outer member and to prevent the inner member from rotating in a second direction opposite to the first direction, and a recording unit (5) comprising: a first sensor arranged to detect rotation of the inner member, and processing circuitry configured to generate dose expulsion data in response to detection of rotation of the inner member.本揭示內容有關藥物輸送裝置,包含:外殼(3);柱塞桿,藉由該外殼(3)所承接,該柱塞桿係可在第一方向中相對該外殼(3)旋轉及可線性地位移;啟動按鈕裝置,可由第一位置線性地位移至第二位置,以藉此在該第一方向中旋轉該柱塞桿;第二方向旋轉防止器,具有可相對該外殼(3)在旋轉方面固定之環狀外部構件、及藉由該外部構件所局部地承接的環狀內部構件,其中該外部構件及該內部構件被配置來承接該柱塞桿,且其中該內部構件係與該柱塞桿在旋轉方面互鎖;其中該外部構件及該內部構件被構造,以允許該內部構件在該第一方向中相對該外部構件旋轉,並防止該內部構件在與該第一方向相反之第二方向中旋轉;及記錄單元(5),包含:第一感測器,被配置來偵測該內部構件的旋轉;及處理電路系統,被建構來回應於該內部構件之旋轉的偵測而產生劑量排出資料。1‧‧‧藥物輸送裝置3‧‧‧外殼5‧‧‧記錄單元7‧‧‧劑量設定構9‧‧‧頂部蓋子
