PHOTO PLETHYSMOGRAPH - The photoplethysmograph uses infrared sensors to detect changes in cutaneous blood flow that occur with each heartbeat. The instrument plugs directly onto the a chart recorder for power, and to print waveforms. The instrument can be AC or DC coupled for different peripheral vascular diagnostic applications.
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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