Patent US5271401A successfully refreshed from Google Patents.
US5271401A
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Radiological imaging method
Assignee: Praxair Technology Inc
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Filing: 1992-01-15
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Granted: 1993-12-21
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Expires: 2012-01-15
Abstract
Abstract A radiological imaging method employing a contrast enhancement agent comprising stable xenon, oxygen and helium, for use with computerized two and three dimensional X-Ray systems and software used with said systems, in the imaging and quantitative measurement of pulmonary ventilation, patency of, distribution of and gas flow in the trachea, bronchi, bronchioles and alveoli, evaluation and optimization of respiratory therapy gas mixtures and pressures separately and in combination, liver blood flow, renal blood flow, cerebral blood flow and brain tissue function.
Inventors
- 👤 Royce S. Fishman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:03
CPC Classifications
A; A61; A61B; A61B6/00; A61B6/48; A61B6/481; A61B5/00; A61B5/08; A61B6/50; A61B6/507; A61B6/504; A61B6/508
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
49 words
A method for carrying out radiological imaging of a patient comprising providing to the patient three gas components stable xenon, oxygen and helium either separately, as a series of gas mixtures, or as a gas mixture containing all three gas components and thereafter performing radiological imaging of the patient.
Claim 2
Independent Claim
49 words
A method for carrying out radiological imaging of a patient comprising providing to the patient three gas components stable xenon, oxygen and helium either separately, as a series of gas mixtures, or as a gas mixture containing all three gas components and thereafter performing radiological imaging of the patient.
Claim 3
Dependent Claim
23 words
The method of claim 1 where in the stable xenon, oxygen and helium are separately contained and provided in series to the patient.
Claim 4
Dependent Claim
37 words
The method of claim 1 wherein a mixture comprising stable xenon and oxygen is first provided to the patient and a mixture comprising helium and oxygen is provided second to the patient prior to the radiological imaging.
Claim 5
Dependent Claim
37 words
The method of claim 1 wherein a mixture comprising helium and oxygen is first provided to the patient and a mixture comprising stable xenon and oxygen is provided second to the patient prior to the radiological imaging.
Claim 6
Dependent Claim
42 words
The method of claim 1 wherein a combination of a therapeutic gas mixture containing helium at a specific pressure is provided to a patient, followed by or alternated with the patient being provided with a gas mixture containing stable xenon and oxygen.
Claim 7
Dependent Claim
44 words
The method of claim 1 wherein a combination of a therapeutic gas mixture containing carbon dioxide at a specific pressure is provided to a patient, followed by or alternated with the patient being provided with a gas mixture containing stable xenon, oxygen and helium.
Claim 8
Dependent Claim
48 words
The method of claim 1 wherein the stable xenon, oxygen and helium are provided to the patient as a gas mixture comprising: (A) from 20.0 to 75.5 mole percent stable xenon; (B) from 19.5 to 75.0 mole percent oxygen; and (C) from 5.0 to 60.5 mole percent helium.
Claim 9
Dependent Claim
22 words
The method of claim 7 wherein the gas mixture further comprises carbon dioxide in a concentration of up to 10 mole percent.
Claim 10
Dependent Claim
21 words
The method of claim 7 wherein the gas mixture further comprises nitrogen in a concentration of up to 55.5 mole percent.
Claim 11
Dependent Claim
14 words
The method of claim 1 wherein the three gas components further comprises carbon dioxide.
Claim 12
Dependent Claim
56 words
The method of claim 1 further comprising taking a baseline radiological image of the patient prior to providing the stable xenon, oxygen and helium to the patient and subtracting the baseline radiological image from a radiological image taken after the provision of stable xenon, oxygen and helium thereby generating an improved image and set of data.
Claim 13
Dependent Claim
13 words
The method of claim 1 wherein the three gas components further comprise nitrogen.
Claim 14
Dependent Claim
22 words
The method of claim 1 wherein the stable xenon, oxygen and helium are inhaled by the patient prior to the radiological imaging.
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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) | 1996-12-20 | 1997-06-21 | 1997-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-12-20 | 2001-06-21 | 2001-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-12-20 | 2005-06-21 | 2005-12-21 | $7700.00 | Window Closed / Lapsed |