| 摘要 |
First and second aspirator manipulation units operate a single-pipette in a coagulation analyzer for aspirating plasma samples from both rubber-capped as well as uncapped vessels. A first holder in the first aspirator manipulation unit actually retains the pipette, while a second holder in the second aspirator manipulation unit is configured to enclose the first holder leaving a predetermined amount of play. To move the pipette toward a sample vessel in a rack that has been shifted into aspiration position, the holders in the manipulation units are inter-fitted, and are translated down. If the pipette strikes a cap, a sensing means in the first aspirator manipulation unit signals a controller to operate the first aspirator manipulation unit to back the pipette upward slightly. Thereupon, the controller, via the second aspirator manipulation unit, actuates the second holder alone to press on the first holder to stab the pipette through the cap. For this operation, the pipette tip is cut obliquely and the rim of its inner wall is specially chamfered to prevent the punctured rubber in the cap from clogging the tip. After the pipette aspirates an aliquot of the plasma sample, the controller actuates the second holder in reverse to draw the pipette out from the cap. The first aspirator manipulation unit carries out other pipette manipulation operations alone. Accordingly, the pipette is driven differentially in accordance with the capped/uncapped status of the vessel present in the aspiration position.
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