A lancet removal mechanism for a blood sampling device contains: a stop assembly, a trigger unit, and a control button. The stop assembly includes an inner protrusion. The trigger unit includes a lancet holder and a triggering shaft, wherein the lancet holder is fixed in the stop assembly and has an outer protrusion formed on an outer wall thereof to engage with the inner protrusion of the stop assembly, the lancet holder has an orifice defined therein, and the orifice has a first inner shoulder arranged on a top end thereof, the triggering shaft extends into the orifice of the lancet holder and has a first outer shoulder for engaging with the first inner shoulder of the lancet holder. Furthermore, the control button is fitted on a top end of the triggering shaft.一種用於採血筆之按壓式退針機構,包含有一擋止座、一擊發單元,以及一退針鈕,擊發單元具有一針頭保持座與一擊發桿,針頭保持座與擋止座之間相互卡接在一起,擊發桿可軸向移動地穿設於針頭保持座內,退針鈕套設於擊發桿之頂端,用以往下推動擊發桿,如此藉由擋止座與針頭保持座之間的卡接關係,使得擊發桿能夠於針頭保持座在保持不動的狀況下將針頭推出針頭保持座外,以順利完成退針動作而有效降低被針頭刺傷的風險。12‧‧‧筆身14‧‧‧筆蓋16‧‧‧針頭18‧‧‧按壓式退針機構20‧‧‧擋止座21‧‧‧固定套件22‧‧‧保持孔23‧‧‧旋轉套件24‧‧‧內擋止部30‧‧‧擊發單元31‧‧‧針頭保持座32‧‧‧擊發孔34‧‧‧外擋止部35‧‧‧缺口36‧‧‧擊發桿41‧‧‧蓋體
