The utility model secured location needle construction system includes: ferrule body,One end of the sleeve body has a restricted entry,Another end has a connector,And the appropriate place of pipe shaft of the sleeve body is provided with a needle stand sliding rail； The one soft needle of infusion,One end of the soft needle of the infusion is insertion end,The other end is connecting pin； One metal needle,The metal needle system is arranged appropriate place outside the insertion end of the soft needle of the what infusion,Wherein one end of the metal needle is needle end,The other end is fixing end； And one sliding needle stand,One end of the needle stand sliding rail is exposed outside the needle stand sliding rail and is connected in one of sliding needle stand portion,The fixing end of another and the metal needle is mutually fixed,And the appropriate place of the what sleeve body inside is set,Expose the needle end of the metal needle outside the what restricted entry,The connecting pin of the soft needle of the infusion is then towards the connector of the sleeve body.本新型安全留置針結構係包括：一套管本體，該套管本體之一端具有一限制口，另端具有一連接口，且該套管本體之管身適當處設置有一針座滑軌；一輸液軟針，該輸液軟針之一端為插入端，另一端為連接端；一金屬針，該金屬針係套設於該輸液軟針之插入端外部適當處，其中該金屬針之一端為針端，另一端為固定端；以及一滑動針座，該滑動針座之一部露出該針座滑軌外部並卡接在該針座滑軌之一端，另一部與該金屬針之固定端相固定，且設置於該套管本體內部之適當處，使該金屬針之針端露出於該限制口外部，該輸液軟針之連接端則朝向該套管本體之連接口。
