Embedded protection type remaining needle structure

The invention relates to the technical field of remaining needles. The embedded protection type remaining needle structure comprises a needle seat part, a needle core part, an extension tube, a flow stopping clamp and an outer connector. The needle seat part comprises a seat body and a soft catheter arranged at the head end of the seat body, a side connector is arranged on one side of the seat body, and the seat body is communicated with an outer connector through the side connector and an extension tube; an isolation plug is fixedly arranged at the position, located behind the side connector, in the base body, an embedded protection head is arranged behind the isolation plug, and the end, facing the isolation plug, of the embedded protection head is concaved inwards to form a low-pressure containing cavity. And the embedded protection head is in sliding fit with the seat body, and is pressed in the seat body under external pressure to form locking. According to the needle withdrawing device, the operator of