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An electronic device for electrical stimulation and measurement of the skin impedance is described. The device allows to program any type of waveform for stimulating the skin. Two investigative experiments were performed to assess the effects of different electrical pulse shapes in the pain sensation and in the measured electrical impedance values. The selective fibers stimulation was studied with...
The investigation of the hydration process during the haemodialysis treatment sessions is very important for the development of methods for predicting the unbalanced fluid shifts and hypotension crisis hence improving the quality of the haemodialysis procedure. About 25% of patients who need haemodialysis treatment experience acute complications (haemodynamic instability) during the treatment sessions...
Miniaturization of biomedical sensors has increased the importance of microsystem technology in medical applications, particularly microelectronics and micromachining. This paper presents a new approach to biomedical monitoring and analysis of selected human cognitive processes. The proposed technique measures human skin conductivity and heart rate using a dedicated measurement system which offers...
An in vivo impedance measurement system using a coaxial needle was developed to investigate the usefulness of impedance information for tumor diagnoses. Impedance in the range of 0 to 200 kHz was measured, and an equivalent circuit representing the tissue structure of tumors was derived. Malignant breast and lung tumors had significantly higher impedances than benign tumors, indicating the system...
Impedance measurements can be used to visualize the distribution of resistivity inside human body. Using arrays of electrodes allows images to be reconstructed. The examination of the breast using an automated examination bank has been realized. The electrodes are moved by pneumatic jacks. This technique both reduces the examination time and ensures a more regular electrode geometry than by manual...
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