| abstract |
The invention relates to the collection of blood with the subsequent separation of serum after clotting for use in chemical analysis thereof. The device is used within an evacuated blood collection tube system in which the latter has a stopper to seal said tube from outside environment and to preserve the systems vacuum. This tube or system is used in conjunction with a special holder and specially designed two ended needle. The needle is threaded into one end of the holder allowing one end to exist within the confines of the holder. The evacuated tube is placed in said holder and after vena puncture is accomplished the tube is pressed forward thereby puncturing the rubber stopper and penetrating said stopper allows blood to enter the evacuated system. Within the glass tube is a plastic cylinder or tubular element in which the aforementioned blood being guided into this element or cylinder is allowed to clot when the serum is allowed to pass through a filter by the force of gravity and or centrifugation whereby said serum becomes located outside of said tubular element and finally being located within the confines of the glass tube. The tubular element is discarded along with the clot and cellular elements contained therein. |