US4236526A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of screening for sickle cell disease by detection of porphyrins and porphyrin metabolites in human dentition
Assignee: Individual
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Filing: 1978-01-31
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Granted: 1980-12-02
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Expires: 1998-01-31
Abstract
Abstract A method of screening for sickle cell disease is provided by detecting the presence of porphyrins and porphyrin metabolites in human teeth comprising cleaning the teeth, exposing the cleaned teeth in vivo to a source of light, which has a wavelength known to excite the fluorescent emission spectrum characteristic of porphyrins and porphyrin metabolites and, optimally, which emits a wavelength of about 360 nm, detecting fluorescence, either visually or photographically, and determining the presence of porphyrins or porphyrin metabolites by emission of fluorescence characteristic thereto.
Inventors
- 👤 Patricia A. Richard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:53
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/72; A; A61; A61C; A61C19/00; A61C19/04
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A clinical method for detecting the presence of porphyrins and porphyrin metabolites associated with sickle cell disease, in a patient whose systemic manifestations do not indicate occurrence of congenital erythropoietic porphyria, comprising: (a) cleaning the teeth of said patient, (b) exposing the outer surface of said cleaned teeth in vivo to a source of excitation spectra light, (c) detecting fluorescence, whereby the presence of said porphyrins or porphyrin metabolites is determined by emission of characteristic fluorescence which can be observed visually, and (d) determining the presence of sickle cell disease based on the results of said detection.
Claim 2
Dependent Claim
97 words
A clinical method for detecting the presence of porphyrins and porphyrin metabolites associated with sickle cell disease, in a patient whose systemic manifestations do not indicate occurrence of congenital erythropoietic porphyria, comprising: (a) cleaning the teeth of said patient, (b) exposing the outer surface of said cleaned teeth in vivo to a source of excitation spectra light, (c) detecting fluorescence, whereby the presence of said porphyrins or porphyrin metabolites is determined by emission of characteristic fluorescence which can be observed visually, and (d) determining the presence of sickle cell disease based on the results of said detection.
Claim 3
Dependent Claim
24 words
The method of claim 1 wherein the cleaning of said teeth includes application of a conventional acidulated prophy paste, followed by rinsing with water.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein said excitation spectra light is ultra-violet light having a wavelength in the range of about 275-400 nm.
Claim 5
Dependent Claim
23 words
The method of claim 1 wherein said source of excitation spectra light is a Wood's lamp emitting a wavelength of about 360 nm.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said source of excitation spectra light is a tunable laser.
Claim 7
Dependent Claim
25 words
The method of claim 1 wherein said fluorescence is recorded and the presence of porphyrins or porphyrin metabolites is determined from examination of said record.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein said record is a photographic record.
Claim 9
Independent Claim
167 words
A method for screening and detecting the occurrence of sickle cell disease in humans, whose systemic manifestations do not indicate occurrence of congenital erythropoietic porphyria, comprising in vivo examination of the teeth to detect the presence of porphyrins or porphyrin metabolites associated therewith; wherein said examination comprises the steps of: (a) cleaning the teeth of said patient, (b) directing upon the outer surface of said cleaned teeth a source of light known to excite the fluorescence emission spectrum characteristic of porphyrins and porphyrin metabolites, (c) detecting any fluorescence emitted from the surface of said teeth upon which said light is directed, (d) determining whether said fluorescence is characteristic of that known to be admitted by porphyrins or porphyrin metabolites under the influence of said light, and (e) determining the presence of sickle cell disease based on the results of said detection, whereby a positive result in detecting the presence of said porphyrins or porphyrin metabolites indicates a positive screening test for the occurrence of sickle cell disease.
Claim 10
Independent Claim
167 words
A method for screening and detecting the occurrence of sickle cell disease in humans, whose systemic manifestations do not indicate occurrence of congenital erythropoietic porphyria, comprising in vivo examination of the teeth to detect the presence of porphyrins or porphyrin metabolites associated therewith; wherein said examination comprises the steps of: (a) cleaning the teeth of said patient, (b) directing upon the outer surface of said cleaned teeth a source of light known to excite the fluorescence emission spectrum characteristic of porphyrins and porphyrin metabolites, (c) detecting any fluorescence emitted from the surface of said teeth upon which said light is directed, (d) determining whether said fluorescence is characteristic of that known to be admitted by porphyrins or porphyrin metabolites under the influence of said light, and (e) determining the presence of sickle cell disease based on the results of said detection, whereby a positive result in detecting the presence of said porphyrins or porphyrin metabolites indicates a positive screening test for the occurrence of sickle cell disease.
Claim 11
Dependent Claim
24 words
The method of claim 8 wherein the cleaning of said teeth includes application of a conventional acidulated prophy paste, followed by rinsing with water.
Claim 12
Dependent Claim
21 words
The method of claim 8 wherein said light is ultra-violet light having a wavelength in the range of about 275-400 nm.
Claim 13
Dependent Claim
22 words
The method of claim 8 wherein said source of ultra-violet light is a Wood's lamp emitting a wavelength of about 360 nm.
Claim 14
Dependent Claim
15 words
The method of claim 8 wherein said source of said light is a tunable laser.
Claim 15
Dependent Claim
26 words
The method of claim 8 wherein said fluorescence detected is recorded and the presence of porphyrins or porphyrin metabolites is determined by examination of said record.
Claim 16
Dependent Claim
12 words
The method of claim 13 wherein said record is a photographic record.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-02 | 1984-06-02 | 1984-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-02 | 1988-06-02 | 1988-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-02 | 1992-06-02 | 1992-12-02 | $7700.00 | Window Closed / Lapsed |