Flat tube pressure sensor
First Claim
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1. A pressure sensor comprising:
- a tube including an outer surface and an arcuate inner surface for channeling a fluid therethrough along a longitudinal axis;
a seat disposed in said outer surface of said tube, with a diaphragm at a bottom thereof;
said diaphragm being planar, and blending at its perimeter coextensively with said arcuate inner surface of said tube;
said tube inner surface including a blend on one longitudinal side of said diaphragm, and said blend tapers in width to transition said tube inner surface from arcuate to flat at said diaphragm; and
a gauge mounted in said seat above said diaphragm for measuring flexure thereof under pressure of said fluid inside said tube.
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Abstract
A pressure sensor includes a tube for channeling a fluid therethrough. A seat is disposed in an outer surface of the tube, with a flexible diaphragm at the bottom thereof. The diaphragm is planar, and blends at its perimeter coextensively with an arcuate inner surface of the tube. A gauge is mounted in the seat above the diaphragm for measuring flexure thereof under pressure of the fluid inside the tube.
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Citations
26 Claims
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1. A pressure sensor comprising:
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a tube including an outer surface and an arcuate inner surface for channeling a fluid therethrough along a longitudinal axis;
a seat disposed in said outer surface of said tube, with a diaphragm at a bottom thereof;
said diaphragm being planar, and blending at its perimeter coextensively with said arcuate inner surface of said tube;
said tube inner surface including a blend on one longitudinal side of said diaphragm, and said blend tapers in width to transition said tube inner surface from arcuate to flat at said diaphragm; and
a gauge mounted in said seat above said diaphragm for measuring flexure thereof under pressure of said fluid inside said tube. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26)
pumping said fluid under pressure through said tube;
measuring flexure of said diaphragm; and
determining pressure of said fluid at said diaphragm in response to said measured flexure.
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22. A method according to claim 21 wherein said fluid is blood, and said blood is pumped to an artery.
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23. A method according to claim 22 further comprising controlling pumping of said blood in response to said measured pressure in said tube.
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24. A method of forming said pressure sensor according to claim 5 comprising:
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deforming a portion of a round tube to form said chord and said blends therefrom;
removing material from said tube outer surface to form said seat therein; and
positioning said flexure measuring gauge and diaphragm at said seat bottom.
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25. A method according to claim 24 further comprising forming said seat blind to define said diaphragm integral with said tube, and incorporating said gauge with said diaphragm inside said seat.
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26. A method according to claim 24 further comprising forming said seat through a wall of said tube, and affixing said diaphragm therein.
Specification