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US 11,920,997 B2Granted
Optical pressure measurement devices, methods, and systems
AssigneeNxStage Medical, Inc.
InventorsMark T. Wyeth, James M. Brugger, Adam G. McDermott
Life of this patent
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Abstract
A pressure measurement system includes a pressure pod with two chambers separated by a diaphragm such that a deformation/movement of the diaphragm is indicative of a difference between the pressures of the two chambers. Such deformation/movement is detected by a device that has no physical contact with the diaphragm, for example, by an optical detector that detects a change in the shape of the diaphragm or a movement of a protrusion on the diaphragm.
Claims7
A method of pressure measurement comprising:
- determining a first Moire pattern resulting from an interference of a first Moire filter with markings on a diaphragm of a pressure pod;
- determining a movement or deformation of the diaphragm based on the first Moire pattern;
- determining a second Moire pattern resulting from an interference of a second Moire filter with markings on a protrusion on the diaphragm of the pressure pod;
- determining a movement of the protrusion on the diaphragm based on the second Moire pattern;
- and
- determining a fluid pressure in the pressure pod based on the movement or deformation of the diaphragm and the movement of the protrusion on the diaphragm.
3 more elements
Dependencies are inferred from the claim text.