Valved blood sampling needle assembly

摘要: A needle assembly for facilitating the collection of a blood sample from patient into an evacuated container while alleviating danger flow fluid during and after sample. The includes housing, forward penetrating end insertion patient, rearward coupling with container, continuous passageway therethrough, resilient elastomeric valve member on normally in position to close between adapted be responsive predetermined decrease pressure deform automatically open when is coupled end. Thereafter, increase return closed prevent rear patient.