Capacitive pressure transducer for use in respirator apparatus

Details Capacitive pressure transducer for use in respirator apparatus Capacitive pressure transducer for use in respirator apparatus

1991-04-16

1992-08-04

Woodiel, Donald O.

Measuring and testing

Fluid pressure gauge

Diaphragm

12820423, 128716, 361283, G01L 912

Patent

active

051348861

ABSTRACT:
An electrically conductive diaphragm is sandwiched between a first and second board member. One of said board members has a metallic plate thereon, there being a non conductive spacer having an opening therein separating such board member from the diaphragm. The board members, diaphragm and spacer are joined together to form an integral assembly, the portion of the diaphragm opposite the opening in the spacer being free to move in such opening towards the board member with the metallic plate, motion of the diaphragm away from the spacer being prevented by the other board member. A respiratory gas inlet is provided through the board member with the metallic plate to the opening in the spacer. The diaphragm and metallic plate form a capacitor the capacitance of which is varied in response to the pressure differential between the gas inlet and the atmosphere, the diaphragm only being free to move towards the metallic plate in response to negative pressures (suction) induced during inspiration by a patient.

REFERENCES:
patent: 5052400 (1991-10-01), Dietz

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