Apparatus for forming a vacuum in a blood tube
AssigneeSarstedt AG & Co.
InventorWalter Sarstedt
Life of this patent
Estimating the term…
Abstract
A tube holding a sample of blood and having an end provided with a pierceable closure is partially evacuated of gas by an apparatus that has a stationary guide defining an axis inclined at an angle to the horizontal. A needle fixed in the guide projects axially downward therein. A slide in the guide forms a downwardly inclined and open seat centered on the axis and adapted to receive the end of the tube. The slide is movable in the guide between an outer position with the seat spaced past an end of the needle and an inner use position with the needle projecting into the seat so that in the use position the needle projects through the closure of the tube fitted to the seat. The slide is urged axially downward in the guide, and a pump is provided for aspirating air through the needle.
Claims3
In combination with a tube holding a sample of blood and having an end provided with a pierceable closure, an apparatus for withdrawing gas from the tube comprising:
- a stationary guide defining an axis inclined at an angle to the horizontal;
- a needle fixed in the guide and projecting axially downward therein;
- a slide in the guide forming a downwardly inclined and open seat centered on the axis and adapted to receive the end of the tube, the slide being movable in the guide between an outer position with the seat spaced past an end of the needle and an inner use position with the needle projecting into the seat, whereby in the use position the needle projects through the closure of the tube fitted to the seat;
- biasing means for urging the slide axially downward in the guide;
- and
- means for aspirating air through the needle.
Dependencies are inferred from the claim text.