STOPPER OF ANALYSIS TEST TUBES

摘要

The stopper (1) has the shape of a small bowl and is provided with a protruding upper circular collar (11); said stopper slidably enters into and seals the neck of a test tube (3) until said collar rests against the mouth of said test tube; the horizontal bottom wall (12) of said stopper is constituted by two or more elastically yielding sectors (13) which can bend under the action of a device (43) introduced into said test tube through said bottom wall to introduce into or withdraw from it liquid, and which then return to their initial position as soon as said device has been extracted from said test tube through said bottom wall. In a preferred embodiment a stopper (2A,2B) preferably of the traditional type sealingly closes the cavity (14) of said first stopper (1) to ensure sealing the vacuum previously provided in the test tube and may then be removed when it is necessary to withdraw blood from the test tube.