Patent US5227308A successfully refreshed from Google Patents.
US5227308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for assessing lung maturity using fluorescence from naphthalene-based probes
Assignee: HAWAII A CORP OF HAWAII, University of
•
Filing: 1991-11-05
•
Granted: 1993-07-13
•
Expires: 2011-11-05
Abstract
Abstract A method for assessing lung maturity in a fetus or an infant comprises adding a fluorescent dye to a pulmonary effluent, causing the dye to fluoresce by illumination with an excitation wavelength of monochromatic light, and measuring the intensity of the fluorescence at two different wavelengths. Alternatively, the method comprises sequential illumination with two different excitation wavelengths and measurement of the intensity of fluorescence caused by each excitation wavelength at a single emission wavelength.
Inventors
- 👤 David M. Jameson
- 👤 Nadhipuram V. Bhagavan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:04
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/92; Y; Y10; Y10S; Y10S436/00; Y10S436/907
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
146 words
A method for assessing lung maturity in a patient comprising (a) adding a naphthalene-based fluorophore to a sample comprising lipids, said lipids originating from at least one lung of said patient, (b) illuminating said sample containing said fluorophore with monochromatic light of wavelength A to cause fluorescence, (c) measuring the intensity of emission of said fluorescence at wavelength B and at wavelength C to obtain the intensity values I B and I C and (d) using said values I B and I C to assess lung maturity wherein wavelength A is selected from 320 to 440 nm, wavelength B corresponds to the emission wavelength which would yield about the maximum intensity if the lipid composition were in its most viscous state and wavelength C corresponds to the emission wavelength which would yield about the maximum intensity if the lipid composition were in its least viscous state.
Claim 2
Independent Claim
146 words
A method for assessing lung maturity in a patient comprising (a) adding a naphthalene-based fluorophore to a sample comprising lipids, said lipids originating from at least one lung of said patient, (b) illuminating said sample containing said fluorophore with monochromatic light of wavelength A to cause fluorescence, (c) measuring the intensity of emission of said fluorescence at wavelength B and at wavelength C to obtain the intensity values I B and I C and (d) using said values I B and I C to assess lung maturity wherein wavelength A is selected from 320 to 440 nm, wavelength B corresponds to the emission wavelength which would yield about the maximum intensity if the lipid composition were in its most viscous state and wavelength C corresponds to the emission wavelength which would yield about the maximum intensity if the lipid composition were in its least viscous state.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein said wavelength A is 360 nm, said wavelength B is 440 nm, and said wavelength C is 490 nm.
Claim 4
Dependent Claim
33 words
The method of claim 1 wherein said step of using said values I B and I C comprises using said measured values I B and I C to obtain the Generalized Polarization value.
Claim 5
Dependent Claim
36 words
The method of claim 1 wherein said step of using said values of I B and I C comprises using said values I B and I C to determine the mole-fraction of lecithin in said sample.
Claim 6
Dependent Claim
13 words
The method of claim 1 or claim 4 wherein said fluorophore is 6-dodecanoyl-2-dimethylaminonaphthalene.
Claim 7
Dependent Claim
25 words
The method of claim 1 or 4 wherein said patient is a fetus and said sample is obtained from the amniotic fluid surrounding said fetus.
Claim 8
Dependent Claim
24 words
The method of claim 1 or 4 wherein said patient is an infant and said sample is obtained from pulmonary effluent from said infant.
Claim 9
Independent Claim
153 words
A method for assessing lung maturity in a patient comprising (a) adding a naphthalene-based fluorophore to a sample comprising lipids, said lipids originating from at least one lung of said patient, (b) illuminating said sample containing said fluorophore with monochromatic light of wavelength A to cause fluorescence, (c) measuring the intensity at wavelength B of emission of said fluorescence caused by step (b) to obtain the intensity value I A (d) illuminating said sample containing said fluorophore with monochromatic light of wavelength C to cause fluorescence, (e) measuring the intensity at wavelength B of emission of said fluorescence caused by step (d) to obtain the intensity value I C and (f) using said values I A and I C to assess lung maturity wherein said wavelength A is selected from 320 to 380 nm, wavelength B is selected from 460 to 540 nm and wavelength C is selected from 380 to 440 nm.
Claim 10
Independent Claim
153 words
A method for assessing lung maturity in a patient comprising (a) adding a naphthalene-based fluorophore to a sample comprising lipids, said lipids originating from at least one lung of said patient, (b) illuminating said sample containing said fluorophore with monochromatic light of wavelength A to cause fluorescence, (c) measuring the intensity at wavelength B of emission of said fluorescence caused by step (b) to obtain the intensity value I A (d) illuminating said sample containing said fluorophore with monochromatic light of wavelength C to cause fluorescence, (e) measuring the intensity at wavelength B of emission of said fluorescence caused by step (d) to obtain the intensity value I C and (f) using said values I A and I C to assess lung maturity wherein said wavelength A is selected from 320 to 380 nm, wavelength B is selected from 460 to 540 nm and wavelength C is selected from 380 to 440 nm.
Claim 11
Dependent Claim
36 words
The method of claim 8 wherein said step of using said values of I A and I C comprises using said values I A and I C to determine the mole-fraction of lecithin in said sample.
Claim 12
Dependent Claim
34 words
The method of claim 8 wherein said step of using said values of I A and I C comprises using said measured values I A and I C to obtain the Generalized Polarization value.
References Cited (Backward Citations)
US4071770A
Cited
US4233032A
Cited
SU1057015A1
Cited
US4388412A
Cited
US4547464A
Cited
US4820628A
Cited
US4784945A
Cited
US4784961A
Cited
US5010016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-12 | 1997-01-11 | 1997-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-12 | 2001-01-11 | 2001-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-12 | 2005-01-11 | 2005-07-13 | $7700.00 | Window Closed / Lapsed |