| 摘要 |
A table top machine of box-like construction has a cutting mechanism in its interior and an entry bore that receives a microhematocrit tube. In a first embodiment, the end of a tube inserted into the machine closes a switch that activates the cutting mechanism so that tubes are always cut in the same place, without regard to the ratio of linear space in the tube occupied by red blood cells, clotted blood cells and clear plasma or serum. In a second embodiment, a photoelectric cell positioned at the inner end of the entry bore triggers the cutting mechanism when the end of the tube filled with red or clotted blood cells has passed the eye. Thus, tubes are cut at differing positions along the extent of the tube, depending upon how much each tube is filled with red blood cells or clotted blood cells and how much is filled with clear plasma or serum.
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