SPECIFIC BEHAVIOUR OF THE BLOOD SEDIMENTATION PROCESSES EXAMINED BY THE ELECTROCHEMICAL IMPEDANCE MICROSENSOR
Keywords:planar IDAE impedance microsensor, blood sedimentation
AbstractElectrochemical impedance microsensor for the fast monitoring of the blood sedimentation has been developed. Planar microsensor consisted of the interdigital array of electrodes (IDAE - finger/gap widths of different values from 5/5 μm to 400/400 μm) based on Au or Pt thin films sputtered on Si/SiO2 or ceramic alumina substrates. IDAE microsensor allows time measurements of electrical impedance changes - impedance rates - (at frequencies of order 0.1 kHz and 10 kHz) of small blood drop applied on it. The determination of the impedance rate during sedimentation and the impedance spectrometry at a low-frequency range of order of 1 kHz seems to be very helpful for a quick diagnostics of the health state. In the IDAE microsensor erythrocyte aggregation/rapid settling/packing periods associated with dryperiod are overlapping due to the planar arrangement of dimensions in order of 1-100 μm. The time monitoring of the blood sedimentation (in the range of 10-900 seconds) by the impedance method can distinguish between healthy and cancer state of blood and could serve for the simple long-term diagnostics after the surgical operation or as a screening procedure for early diagnoses.
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