Patent ID: 11920997
Assignee: NXSTAGE MEDICAL, INC.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. 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.