Negative pressure measurement system
First Claim
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1. A system for measuring pressure in a fluid line, comprising:
- a fluid chamber connected to said fluid line;
a first flexible pressure transfer diaphragm forming one wall of said fluid chamber;
a second flexible pressure transfer diaphragm placed in sealing engagement with said first diaphragm and forming an intermediate vacuum chamber for transferring pressure changes in said fluid chamber from said first diaphragm to said second diaphragm;
means for inducing a vacuum in said chamber for maintaining said first and second diaphragms in constant sealing engagement; and
a pressure transducer coupled to said second diaphragm responsive to pressure changes transferred by said second diaphragm.
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Abstract
The negative pressure monitor is intended for use in combination with an IV administration set, for monitoring venous, arterial and other physiological pressure signals. The system provides a coupling mechanism with a sealed vacuum chamber between a fluid chamber in communication with the fluid in line, and the pressure transducer. The vacuum in the coupling mechanism serves not only to communicate pressure changes within the fluid chamber to the pressure transducer, but also functions to maintain the fluid chamber in pressure communication with the pressure transducer.
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Citations
30 Claims
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1. A system for measuring pressure in a fluid line, comprising:
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a fluid chamber connected to said fluid line; a first flexible pressure transfer diaphragm forming one wall of said fluid chamber; a second flexible pressure transfer diaphragm placed in sealing engagement with said first diaphragm and forming an intermediate vacuum chamber for transferring pressure changes in said fluid chamber from said first diaphragm to said second diaphragm; means for inducing a vacuum in said chamber for maintaining said first and second diaphragms in constant sealing engagement; and a pressure transducer coupled to said second diaphragm responsive to pressure changes transferred by said second diaphragm. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A system for measuring pressure in a fluid line comprising:
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a disc body member having a fluid chamber connected to said fluid line; a first flexible pressure transfer diaphragm secured to said disc body member and forming one wall of said fluid chamber; a main body member having a second flexible pressure transfer diaphragm secured thereto placed in sealing engagement with said first diaphragm and forming an intermediate vacuum chamber for transferring pressure changes in said fluid chamber from said first diaphragm to said second diaphragm; means for including a vacuum in said vacuum in said vacuum chamber for maintaining said first and second diaphragms in constant sealing engagement; and a pressure transducer coupled to said second diaphragm responsive to pressure changes transferred by said second diaphragm. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A pressure coupling means for use in a pressure monitoring assembly for monitoring pressure in a fluid line, comprising:
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a disc body member including a fluid chamber connected to said fluid line and including a first flexible pressure transfer diaphragm forming one wall of said fluid chamber; a main body member including a second flexible pressure transfer diaphragm placed in sealing engagement with said first diaphragm and forming an intermediate vacuum chamber for communicating pressure changes in said fluid line from said first diaphragm to said second diaphragm, and means for inducing a vacuum in said vacuum chamber, for maintaining said first and second diaphragms in constant sealing engagement. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification