A plethysmograph sensor that attaches to a plethysmograph instrument, used to measure volume changes in a limb or digit. The sensor has a tube filled with electrically resistive fluid (indium-gallium), and is wrapped around the circumference of the limb or digit. The plethysmograph instrument measures the resistance changes of the sensor that occur when the resistive fluid column length changes according to circumference changes that occur with vascular flow changes.
A hoop-like device intended to be wrapped around a limb or digit and used in conjunction with a limb plethysmograph (not included) to determine volume variations in the extremities (e.g., legs, toes, arms, fingers) as modified by the circulation of blood through them. Often referred to as a strain gauge, it typically operates based on electrical resistance changes with length, and is used during assessment of a variety of clinical conditions (e.g., endothelial dysfunction, reactive hyperemia, deep vein thrombosis) and for a number of techniques (e.g., arterial inflow, venous capacitance, maximum venous outflow), often with rapid cuff inflation devices. This is a reusable device.
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