Instrument for measuring the hematocrit value of blood
First Claim
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1. An apparatus for measuring the hematocrit value of a blood sample comprising:
- an upper electrode having a sample contact surface;
a lower electrode having a sample contact surface which is substantially the same size and shape as said upper electrode contact surface;
means for selectively moving the electrodes between a blood sample measurement position and a second position where said electrodes are displaced away from each other to facilitate cleaning of the electrode faces and introduction of blood samples onto the electrode faces and wherein said electrode faces in said sample measurement position are substantially parallel with said upper electrode face being located directly above said lower electrode face at a spaced distance from said lower electrode face such that a blood sample defining a cylindrical column having a vertical axis may be formed between said upper and lower electrode faces, said electrode faces being oriented such that sedimentation of said blood sample occurs along the vertical axis of said blood sample column; and
conductometry means connected to said electrodes for measuring the hematocrit value of the blood sample.
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Abstract
The new instrument for taking readings of the hematocrit value from a blood sample has two electrodes with which the conductivity of the sample may be measured. The sample contacting faces of the electrodes are placed in a horizontal plane with an accurately fixed spacing therebetween so that a blood column of a given size may be formed from the sample. The sample is acted upon by ac. From a reading representative of the change in impedance the hematocrit value may be read off from a calibration curve.
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Citations
15 Claims
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1. An apparatus for measuring the hematocrit value of a blood sample comprising:
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an upper electrode having a sample contact surface; a lower electrode having a sample contact surface which is substantially the same size and shape as said upper electrode contact surface; means for selectively moving the electrodes between a blood sample measurement position and a second position where said electrodes are displaced away from each other to facilitate cleaning of the electrode faces and introduction of blood samples onto the electrode faces and wherein said electrode faces in said sample measurement position are substantially parallel with said upper electrode face being located directly above said lower electrode face at a spaced distance from said lower electrode face such that a blood sample defining a cylindrical column having a vertical axis may be formed between said upper and lower electrode faces, said electrode faces being oriented such that sedimentation of said blood sample occurs along the vertical axis of said blood sample column; and conductometry means connected to said electrodes for measuring the hematocrit value of the blood sample. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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Specification