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Design and development of a prototype unit to measure venous refilling time (VRT) and muscle pump capacity (MPC) during a venous muscle pump test (VMPT) is presented here. Instead of normalizing the photo-plethysmo-graph (PPG), as is common in the VMPT instruments in vogue, a suitable signal processing technique that extracts a signal proportional only to the blood volume changes underneath the PPG...
A capacitance to digital converter that directly translates the changes in a differential type capacitive sensor to a proportional digital value is described in this work. The proposed method employs a suitably modified, dual-slope, analog to digital conversion technique. Error analysis and results obtained from a prototype built around a microcontroller establish the efficacy of the proposed method
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