It is a kind of with the blood collecting pen for ensuring to release needle mechanism,To control the movement of blood sampling needle assemblies and include: a structure of pen holder,It offers sliding slot and definition has needle direction out； One piston rod,The interspersed what structure of pen holder of activity,Piston rod offers groove and with convex block and the needle stand that is connected to what groove,Blood taking needle modular connector what needle stand； One clamping piece,It is arranged in what structure of pen holder and has elastic arm corresponding with convex block,Elastic arm one end connects what clamping piece and is formed towards the extension of needle direction is gone out and have serrate pressure contact portion； And a push button,Corresponding runner position is sliding and has pressing arm and push rod,Pressing arm corresponds to what elastic arm and can suppress what pressure contact portion and make each sawtooth of convex block clip what,Push rod protrudes into groove and can push blood sampling needle assemblies. By achieving the effect that ensure smoothly to release needle.一種具有確保釋針機制的採血筆，用以控制採血針組件動作且包括：一筆桿結構，開設有滑槽且定義有出針方向；一活塞桿，活動穿插於筆桿結構，活塞桿開設有溝槽且具有凸塊和連通於溝槽的針座，採血針組件插接於針座；一夾持件，設置於筆桿結構內且具有與凸塊對應的彈臂，彈臂一端連接於夾持件並朝出針方向延伸而形成具有鋸齒的壓接部；以及一推鍵，對應滑槽位置滑接且具有壓制臂和推桿，壓制臂對應於彈臂並能壓制於壓接部而使凸塊卡掣於各鋸齒，推桿伸入溝槽內並能推動採血針組件。藉由，達到確保順利釋針的效果。
