DOPPLER AND PLETHYSMOGRAPH SYSTEM - The line-powered instrument contains a direction-sensing continuous wave Doppler, a photo plethysmograph, and a pneumo plethysmograph. Several types of diagnostic tests can be performed allowing the user to choose the most appropriate one for the particular study of interest. A built-in two speed chart recorder can record the waveform from the selected instrument mode. A digital output is included so waveforms can also be captured in computer software.
A graphic recorder designed for determining and registering volume variations in the extremities (legs/toes and/or arms/fingers) as modified by the circulation of blood through them. It typically consists of flow and/or volume sensors and transducers attached to an electronic unit, which processes the data and displays the results. It may operate using one of several methods including venous occlusion (pneumatic), photoelectric, electrical impedance, or strain gauge. The device is typically used in peripheral vascular diagnostic investigations [e.g., for deep vein thrombosis (DVT) or arterial occlusive disease].
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