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US5178153A
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Fluid flow sensing apparatus for in vivo and industrial applications employing novel differential optical fiber pressure sensors
Assignee: Optical Technologies Inc
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Filing: 1985-02-25
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Granted: 1993-01-12
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Expires: 2005-02-25
Abstract
Abstract An optical fiber fluid flow device is provided for in vivo determination of blood flow in arteries. The device includes a fiber optical fluid pressure measuring device having at least first and second optical fiber sensors which optical fiber sensors are positioned in the blood passage and in a restricted flow area in the blood passage and the two fiber optical pressure fluid sensors are connected to an interferometer associated with an opto-electronic demodulator which has an output signal representing the differential pressure between the two sensed area. The device also has utility in industrial applications.
Inventors
- 👤 Robert E. Einzig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:14
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/68; A61B5/6846; A61B5/6847; A61B5/6852; A61B5/6853; A61B5/02; A61B5/026; A61B5/0261; G; G01; G01F; G01F1/00; G01F1/05; G01F1/34; G01F1/36; G01F1/363; G01F1/66; G01F1/661; G01L; G01L11/00; G01L11/02; G01L11/025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
A fiber optic fluid pressure measuring device comprising a first optical fiber configured as a Fabry-Perot interferometer, a pressure responsive end on the first optical fiber, said pressure responsive end of said optical fiber including a first partial mirror and a mirrored end spaced therefrom, means positioning said responsive end in the fluid to be measured, a second optical fiber configured as a second Fabry-Perot interferometer, a pressure responsive end, said pressure responsive end of said second optical fiber including a first partial mirror and a mirrored end spaced therefrom, a constriction in the fluid to be measured spaced from the means positioning the first responsive end in the fluid to be measured, means positioning the second optical fiber responsive end in the fluid at the other side of the constriction, radiant energy emitting means for directing radiant energy to the interferometers and through their optical fiber responsive ends, and radiant energy detecting means connected to said interferometers.
Claim 2
Dependent Claim
158 words
A fiber optic fluid pressure measuring device comprising a first optical fiber configured as a Fabry-Perot interferometer, a pressure responsive end on the first optical fiber, said pressure responsive end of said optical fiber including a first partial mirror and a mirrored end spaced therefrom, means positioning said responsive end in the fluid to be measured, a second optical fiber configured as a second Fabry-Perot interferometer, a pressure responsive end, said pressure responsive end of said second optical fiber including a first partial mirror and a mirrored end spaced therefrom, a constriction in the fluid to be measured spaced from the means positioning the first responsive end in the fluid to be measured, means positioning the second optical fiber responsive end in the fluid at the other side of the constriction, radiant energy emitting means for directing radiant energy to the interferometers and through their optical fiber responsive ends, and radiant energy detecting means connected to said interferometers.
Claim 3
Dependent Claim
165 words
Means for measuring fluid flow in arteries and veins comprising a catheter, fiber optic differential pressure measuring means housed in the catheter, said pressure measuring means comprising a first optical fiber configured as a first Fabry-Perot interferometer, a first fluid pressure responsive end on the first optical fiber, means mounting the first optical fiber responsive end in one end of the catheter, an enlarged zone formed on the catheter spaced from the first responsive end, a second optical fiber configured as a second Fabry-Perot interferometer, a second fluid pressure responsive end on the second optical fiber, means mounting the second pressure responsive end on the other side of said enlarged zone from the first responsive end, each of the optical fiber responsive ends including a first partial mirror and a mirrored end spaced therefrom, radiant energy emitting means for directing radiant energy to the interferometers, and through said first and second responsive ends, and radiant energy detecting means connected to said first and second interferometers.
Claim 4
Dependent Claim
165 words
Means for measuring fluid flow in arteries and veins comprising a catheter, fiber optic differential pressure measuring means housed in the catheter, said pressure measuring means comprising a first optical fiber configured as a first Fabry-Perot interferometer, a first fluid pressure responsive end on the first optical fiber, means mounting the first optical fiber responsive end in one end of the catheter, an enlarged zone formed on the catheter spaced from the first responsive end, a second optical fiber configured as a second Fabry-Perot interferometer, a second fluid pressure responsive end on the second optical fiber, means mounting the second pressure responsive end on the other side of said enlarged zone from the first responsive end, each of the optical fiber responsive ends including a first partial mirror and a mirrored end spaced therefrom, radiant energy emitting means for directing radiant energy to the interferometers, and through said first and second responsive ends, and radiant energy detecting means connected to said first and second interferometers.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-01-12 | 1996-07-13 | 1997-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-01-12 | 2000-07-13 | 2001-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-01-12 | 2004-07-13 | 2005-01-12 | $7700.00 | Window Closed / Lapsed |