A blood collection tube holder having a retractable single needle and a body comprising substantially parallel and laterally spaced apart barrel and needle retraction cavities separated by a partial wall that facilitates lateral movement of the single needle from the barrel cavity into alignment with the needle retraction cavity to initiate needle retraction. The barrel and a frontal attachment to the barrel are cooperatively configured to facilitate relative sliding movement between in a direction that is transverse to the longitudinal axis through the retractable single needle to initiate needle retraction.一種血液收集管座，其具有：可撤回的單一針頭；以及本體，其包括由部分壁所分開之大致平行且側向隔開的筒腔和針頭撤回腔，該部分壁便於單一針頭從筒腔側向移動成對齊於針頭撤回腔以啟動針頭撤回。針筒和針筒的前附接件偕同運作地建構成便於在橫向於穿過可撤回的單一針頭之縱軸的方向上而在其間做相對滑移以啟動針頭撤回。
