US5375592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon dioxide detector and shield
Assignee: Covidien LP
•
Filing: 1993-04-08
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Granted: 1994-12-27
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Expires: 2013-04-08
Abstract
Abstract An apparatus (14) for detecting carbon dioxide in exhaled gas is disclosed. The apparatus comprises an indicating element (10) for changing color when exposed to carbon dioxide and a carbon dioxide shield (12) for absorbing a predetermined level of carbon dioxide from the exhaled gas before exposing the indicating element (10) to the exhaled gas.
Inventors
- 👤 Gilbert M. Kirk
- 👤 James D. Bickley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:35
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/04; A61M16/0488; A61M16/10; A61M16/105; A61M16/1055; A61M16/106; A61M16/107; A61M16/22; A61M16/0402; A61M16/0411; A61M2016/0413; Y; Y10; Y10S; Y10S116/00; Y10S116/41; Y10S436/00; Y10S436/90
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
55 words
Apparatus for detecting carbon dioxide in exhaled gas comprising: an indicating means for changing color in the presence of carbon dioxide; a carbon dioxide shield, associated with the indicating means, for absorbing up to a predetermined threshold concentration of carbon dioxide; and a housing for receiving the exhaled gas and for displaying the indicating element.
Claim 2
Dependent Claim
55 words
Apparatus for detecting carbon dioxide in exhaled gas comprising: an indicating means for changing color in the presence of carbon dioxide; a carbon dioxide shield, associated with the indicating means, for absorbing up to a predetermined threshold concentration of carbon dioxide; and a housing for receiving the exhaled gas and for displaying the indicating element.
Claim 3
Dependent Claim
18 words
The apparatus of claim 1 having first and second openings for serially connecting to a respiratory supply line.
Claim 4
Dependent Claim
17 words
The apparatus of claim 1 wherein said carbon dioxide shield comprises either sodium hydroxide or calcium hydroxide.
Claim 5
Dependent Claim
15 words
The apparatus of claim 1 wherein said housing is constructed out of a clear material.
Claim 6
Dependent Claim
19 words
The apparatus of claim 1 wherein said indicating element and said carbon dioxide shield occupy a low dead space.
Claim 7
Dependent Claim
18 words
The apparatus of claim 1 wherein said predetermined threshold concentration of carbon dioxide is at least about 2.2%.
Claim 8
Dependent Claim
25 words
The apparatus of claim 1 wherein said indicating means and said carbon dioxide shield are contained in a dead space of less than 50 cc.
Claim 9
Dependent Claim
13 words
Apparatus of claim 1 wherein said CO 2 shield comprises a strip carrier.
Claim 10
Dependent Claim
25 words
Apparatus of claim 1 wherein said indicating means, after indicating the presence of CO 2 , changes color indicating the absence of CO 2 .
Claim 11
Independent Claim
89 words
A method for detecting carbon dioxide in gas exhaled by a patient comprising the steps of: shielding a carbon dioxide detector from the flow of exhaled gas with a carbon dioxide absorption element on a strip carrier; absorbing the carbon dioxide below predetermined threshold concentration; exposing the carbon dioxide detector to exhaled gas having the predetermined amount of carbon dioxide removed to effect a color change in the detector; and displaying the changed color of said carbon dioxide detector indicating the concentration of carbon dioxide in the exhaled gas.
Claim 12
Independent Claim
89 words
A method for detecting carbon dioxide in gas exhaled by a patient comprising the steps of: shielding a carbon dioxide detector from the flow of exhaled gas with a carbon dioxide absorption element on a strip carrier; absorbing the carbon dioxide below predetermined threshold concentration; exposing the carbon dioxide detector to exhaled gas having the predetermined amount of carbon dioxide removed to effect a color change in the detector; and displaying the changed color of said carbon dioxide detector indicating the concentration of carbon dioxide in the exhaled gas.
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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) | 1997-12-26 | 1998-06-27 | 1998-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-12-26 | 2002-06-27 | 2002-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-12-26 | 2006-06-27 | 2006-12-27 | $7700.00 | Window Closed / Lapsed |