Stopper of analysis test tubes

Abstract

A test tube stopper (1) has the shape of a small bowl and is provided with a protruding upper circular collar (11). The stopper (1) slidably enters into and seals the neck of a test tube (3) until the collar (11) rests against the mouth of the test tube (3). A horizontal bottom wall (12) of the stopper (1) is comprised of two or more elastically yielding sectors (16) which can bend under the action of a device (43) being introduced into the test tube (3) through the bottom wall (12) for introducing or withdrawing liquid. The resilient sectors (16) return to their initial position as soon as the device (43) has been extracted from the test tube (3) through the bottom wall (12). In a preferred embodiment a stopper (2), preferably of the conventional type, sealingly closes a cavity (14) of the stopper (1) to ensure sealing a vacuum previously provided in the test tube (3). The stopper (2) may then be removed when it is necessary to withdraw blood from the test tube (3).

Dependencies are inferred from the claim text.