Chemistry: electrical and wave energy – Processes and products – Vacuum arc discharge coating
Patent
1977-07-21
1978-10-17
Kaplan, G. L.
Chemistry: electrical and wave energy
Processes and products
Vacuum arc discharge coating
128 2E, 204 1T, 204195B, 324 29, G01N 2754
Patent
active
041207700
ABSTRACT:
The oxygen concentration (partial pressure) in a perfused medium, such as man tissue through which blood is perfused, is measured polarographically. The polarographic measurement process itself consumes oxygen, and tends to yield a read-out lower than the true concentration. Non-zero perfusion tends to replenish the consumed oxygen, thus counteracting the too low read-out, but the read-out is still lower than the true concentration. The uncorrected oxygen measurement is corrected by one factor to simulate a condition wherein perfusion is zero but oxygen consumption is non-zero, and by a second factor to simulate a condition in which the perfusion has its actual value but oxygen consumption is zero, thereby yielding an accurate oxygen read-out. A switchover device connects a polarography electrode and a reference electrode across a hydrogen-generating unit, and then a polarograhic hydrogen-measuring unit, and then a polarographic oxygen-measuring unit, in succession. The information concerning the wash-out of the generated hydrogen is converted into a corrective factor compensating for the non-zero perfusion. The other corrective factor is introduced to compensate for the effect of the non-zero perfusion upon the rate at which oxygen is consumed during the polarographic measurement, by taking into account the diffusion resistance of the type of tissue involved.
REFERENCES:
patent: 3918434 (1975-11-01), Lubbers
Kaplan G. L.
Max-Planck-Gesellschaft zur Forderung der Wissenschaften e.v.
Striker Michael J.
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