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  • Plethysmographs designed for non-invasive measuring and recording data and graphics (i.e., a plethysmogram) of the volume and variations in the volume of the lower limbs due to the presence and flow of blood in the leg vascular system. The primary techniques used are based on: (1) changes in volume or variations in the pulse volume waveform and amplitude (also known as segmental plethysmography), pulse volume recording (PVR) plethysmography, and pneumo plethysmography; (2) changes in the impedance (impedance plethysmography); (3) changes in the optical properties of tissues (photo plethysmography); (4) changes in pressure using a strain gauge transducer sensor. Other techniques based on different parameters, such as capacitance and/or inductance variations. Lower limb plethysmographs are mainly intended to detect and assess diseases related to deep venous blood flow (e.g., thrombosis).
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