US4691701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon dioxide detector
Assignee: Individual
•
Filing: 1986-07-28
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Granted: 1987-09-08
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Expires: 2006-07-28
Abstract
Abstract A carbon dioxide detector for determining the correct location of an endotracheal tube following intubation of a patient. The detector includes a housing with a first tubular member for connection to a endotracheal tube or the like, a second tubular member for connection to an anaesthetic circuit and an indicator to indicate the presence of carbon dioxide in the detector. Preferably the indicator is in the form of a transparent disc which sealingly engages an aperture in the housing, the disc having a chemical substance which provides a colour change indication when exposed to carbon dioxide from a patient.
Inventors
- 👤 R. Tudor Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:23
CPC Classifications
A; A61; A61B; A61B10/00; A61M; A61M16/00; A61M16/04; A61M16/0488; A61M16/0402; A61M16/0411; A61M2016/0413
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
A carbon dioxide detector for use with an endotracheal tube or the like or an anaesthetic circuit comprising: a housing having a first tubular member for connection to a endotracheal tube or the like; a second tubular member for connection to said anaesthetic circuit, said first and second tubular members being in communication with the interior of said housing; and means for indicating the presence of carbon dioxide in said detector comprising an aperture in said housing and in communication with said interior thereof and transparent disc means for sealingly engaging said aperture and thereby being in communication with said housing interior; said disc means including a chemical substance which provides a colour change indication when exposed to carbon dioxide in said housing.
Claim 2
Dependent Claim
123 words
A carbon dioxide detector for use with an endotracheal tube or the like or an anaesthetic circuit comprising: a housing having a first tubular member for connection to a endotracheal tube or the like; a second tubular member for connection to said anaesthetic circuit, said first and second tubular members being in communication with the interior of said housing; and means for indicating the presence of carbon dioxide in said detector comprising an aperture in said housing and in communication with said interior thereof and transparent disc means for sealingly engaging said aperture and thereby being in communication with said housing interior; said disc means including a chemical substance which provides a colour change indication when exposed to carbon dioxide in said housing.
Claim 3
Dependent Claim
26 words
A detector according to claim 1 wherein said housing aperture has a circular collar and said disc means has an on/off snap fit on said collar.
Claim 4
Dependent Claim
36 words
A detector according to claim 1 wherein said disc means including surfaces sealing said chemical substance and a removable flap on at least one of said sealing surfaces to expose said substance to said housing aperture.
Claim 5
Dependent Claim
13 words
A detector according to claim 1 wherein said chemical substance is Hydrazine salt.
Claim 6
Dependent Claim
17 words
A detector according to claim 1 wherein said disc means is formed of litmus paper type material.
Claim 7
Dependent Claim
28 words
A detector according to claim 1 wherein said disc means is formed of a powder with a filter means on either side thereof for retaining said powder therebetween.
References Cited (Backward Citations)
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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) | 1990-09-07 | 1991-03-09 | 1991-09-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-07 | 1995-03-09 | 1995-09-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-07 | 1999-03-09 | 1999-09-08 | $7700.00 | Window Closed / Lapsed |