Transducer housing with a calibration port
First Claim
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1. A disposable pressure transducer apparatus for use in measuring hemodynamic pressure and the like, comprising:
- housing means for defining a fluid passageway for containing a pressurized fluid, and for defining a transducer chamber separated from the fluid passageway, said housing means comprising a pressure monitoring port means for providing communication of fluid pressures in the fluid passageway to the transducer chamber;
transducer means, disposed in the transducer chamber, for producing electrical signals proportional to fluid pressures sensed in the fluid passageway through the pressure monitoring port means, said transducer means comprising a diaphragm that if flexed in response to the sensed fluid pressures, a front side of the diaphragm disposed over the pressure monitoring port means;
first hermetic sealing means for creating an airtight seal so that the front side of the diaphragm is in fluid communication only with the pressure monitoring port means and the sensed fluid pressure in the fluid passageway;
said housing means further comprising a female calibration port means for providing a vent to atmosphere and for providing communication of calibration pressure to the transducer chamber, said housing means further comprising another port means for providing electrical connection of a cable therethrough to said transducer means;
said transducer means further comprising a backside of the diaphragm in fluid communication with the atmospheric or calibration pressures communicated through the calibration port means; and
second hermetic sealing means for creating an airtight seal so that the backside of the diaphragm is in fluid communication only with the calibration port means and the atmospheric or calibration pressures communicated therethrough.
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Abstract
A novel pressure transducer apparatus for medical pressure monitoring apparatus having a housing with a calibration port. The patient side of the transducer senses fluid pressures to be monitored. The non-patient side of the transducer is hermetically sealed in the housing of the apparatus. The housing has a female calibration port communicating, via a pinhole, with the non-patient side of the transducer. The non-patient side of the transducer can thus alternatively be vented to atmospheric pressure or be exposed to a vacuum calibration pressure.
44 Citations
36 Claims
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1. A disposable pressure transducer apparatus for use in measuring hemodynamic pressure and the like, comprising:
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housing means for defining a fluid passageway for containing a pressurized fluid, and for defining a transducer chamber separated from the fluid passageway, said housing means comprising a pressure monitoring port means for providing communication of fluid pressures in the fluid passageway to the transducer chamber; transducer means, disposed in the transducer chamber, for producing electrical signals proportional to fluid pressures sensed in the fluid passageway through the pressure monitoring port means, said transducer means comprising a diaphragm that if flexed in response to the sensed fluid pressures, a front side of the diaphragm disposed over the pressure monitoring port means; first hermetic sealing means for creating an airtight seal so that the front side of the diaphragm is in fluid communication only with the pressure monitoring port means and the sensed fluid pressure in the fluid passageway; said housing means further comprising a female calibration port means for providing a vent to atmosphere and for providing communication of calibration pressure to the transducer chamber, said housing means further comprising another port means for providing electrical connection of a cable therethrough to said transducer means; said transducer means further comprising a backside of the diaphragm in fluid communication with the atmospheric or calibration pressures communicated through the calibration port means; and second hermetic sealing means for creating an airtight seal so that the backside of the diaphragm is in fluid communication only with the calibration port means and the atmospheric or calibration pressures communicated therethrough. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. An apparatus comprising:
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housing means for defining a fluid passageway for containing a pressurized fluid, and for defining a transducer chamber separated from the fluid passageway, said housing means comprising top and bottom members which, when joined together, form therebetween the transducer chamber, said housing means further comprising a pressure monitoring port means for providing communication of fluid pressures in the fluid passageway to the transducer chamber, and further comprising a female calibration port means for providing a vent to atmosphere and for providing communication of calibration pressure to the transducer chamber, said housing means further comprising another port means for providing electrical connection of a cable therethrough to said transducer means; a semiconductor transducer means for sensing fluid pressures, and comprising a diaphragm with a front side for sensing fluid pressures communicated through the pressure monitoring port means, and a backside for sensing atmospheric and calibration pressures communicated through the calibration port means, said transducer means being disposed in the transducer chamber; two-sided carrier means for securing the semiconductor transducer means in the transducer chamber, and comprising isolation means disposed in the pressure monitoring port means for electrically isolating the front side of the diaphragm from fluids contained in the fluid passageway, while still communicating fluid pressures through the isolating means to the front side of the diaphragm; first hermetic sealing means for creating an airtight seal so that the front side of the diaphragm is in fluid communication only with the pressure monitoring port means and the sensed fluid pressures in the fluid passageway; and second hermetic sealing means for creating an airtight seal so that the backside of the diaphragm is in fluid communication only with the calibration port means and the atmospheric or calibration pressures communicated therethrough. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A disposable pressure transducer apparatus for use in measuring hemodynamic pressures and the like, comprising:
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housing means for defining a fluid passageway for containing a pressurized fluid, and for defining a transducer chamber separated from the fluid passageway, said housing means comprising top and bottom members which, when joined together, form therebetween the transducer chamber, and further comprising a pressure monitoring port for providing communication of fluid pressures in the fluid passageway to the transducer chamber, and a female calibration port for providing a vent to atmosphere and for providing communication of calibration pressures to the transducer chamber, and wherein the female calibration port is formed in the bottom member in the form of a generally cylindrical, tapered well with a bottom and cylindrical sides, and an open top, the bottom of the well having a small pinhole formed at a juncture between the bottom of the well and the cylindrical sides so as to provide communication of said atmospheric and calibration pressures therethrough to said transducer chamber; a semi-conductor transducer means for sensing fluid pressures, and comprising a diaphragm with a front side for sensing fluid pressures communicated through the pressure monitoring port, and a backside for sensing atmospheric and calibration pressures communicated through the pinhole of the female calibration port, said transducer means being disposed in the transducer chamber; carrier means for securing the semi-conductor transducer means in the transducer chamber, and comprising isolation means disposed in the pressure monitoring port for electrically isolating the front side of the diaphragm from fluids contained in the fluid passageway, while still communicating fluid pressure through the isolation means to the front side of the diaphragm, said carrier means further comprising an aperture that communicates with the backside of the transducer diaphragm and wherein said aperture is generally aligned with the center of the bottom of the well and is not in alignment with the pinhole so as to form a tortuous path for fluid communication between the outside of the housing means and the backside of the transducer diaphragm; first hermetic sealing means for creating an airtight seal so that the front side of the diaphragm is in fluid communication only with the pressure monitoring port and the sensed fluid pressures in the fluid passageway; and second hermetic sealing means for creating an airtight seal so that the backside of the diaphragm is in fluid communication only with the atmospheric or calibration pressures communicated through the pin hole and the aperture of said carrier means.
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Specification