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Figure 1 Schematic diagram of the sensor’s structure. The sensor is partitioned into two separate sections that are independently pressurized. The sensor cap has a split thimble design that imparts a two-point clamping effect to lock the sensor to the finger tip while measuring pulsatile volume changes. The adjacent open-ended annular cuff provides a buffering effect against retrograde shock waves, to reduce noise, but is not used for sensing. Both compartments are designed to keep the venous transmural pressure negative to prevent venous pooling and distention and to ensure that only arterial volume changes are recorded.
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