CPC G01L 27/005 (2013.01) [A61B 5/03 (2013.01); A61B 5/031 (2013.01); A61M 27/00 (2013.01); A61M 27/006 (2013.01); G01L 27/00 (2013.01); A61B 2562/0247 (2013.01)] | 20 Claims |
1. A device comprising:
a housing enclosing a chamber and having at least one port that communicates with the chamber,
a pressure sensor receiving fluid pressure from the chamber,
the chamber having a compliance that exhibits a marked change in volumetric stiffness repeatably at a fixed pressure, wherein the chamber is formed between a first flexible wall portion and a second flexible wall portion, and
a sealed cavity divided from the chamber by the first flexible wall portion, such that an increasing pressure in the chamber causes increasing deflection of the first flexible wall portion, wherein the pressure sensor is within an enclosure sealed from the chamber by the second flexible wall portion.
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