US4883050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit providing indication of air entrapment in patient's lungs
Assignee: Monaghan Medical Corp
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Filing: 1988-02-29
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Granted: 1989-11-28
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Expires: 2008-02-29
Abstract
Abstract A rate volume monitor includes a sensor which provides an output upon inspiration and upon expiration. If inspiration follows expiration too closely a computer operates an alarm to provide warning that air entrapment or "stacking" may occur in the patient's lungs.
Inventors
- 👤 Robert Urman
- 👤 Alfred G. Brisson
- 👤 Cristopher Nowacki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:15
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/0051; A61M16/021; A61M16/0003; A61M2016/0015; A61M2016/0018; A61M2016/0021; A61M2016/003; A61M2016/0033; A61M2016/0036
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
145 words
Apparatus for patient ventilation comprising forced ventilation means for connection to a patient, sensor means connected to said ventilation means for producing an electrical signal in accordance with air flow on inspiration and on expiration, first signal means connected to said sensor means for detecting when expiration drops below a predetermined threshold and producing a first electrical output in accordance therewith, second signal means connected to said sensor means and producing a second electrical output upon start of inspiration, timing means to which said first and second signal means are connected and producing a third electrical output if said first and second electrical outputs are closer in time than a predetermined time, and alarm means to which said third electrical output is connected and providing an alarm if a plurality of said first and second electrical outputs are closer in time than said predetermined time.
Claim 2
Dependent Claim
145 words
Apparatus for patient ventilation comprising forced ventilation means for connection to a patient, sensor means connected to said ventilation means for producing an electrical signal in accordance with air flow on inspiration and on expiration, first signal means connected to said sensor means for detecting when expiration drops below a predetermined threshold and producing a first electrical output in accordance therewith, second signal means connected to said sensor means and producing a second electrical output upon start of inspiration, timing means to which said first and second signal means are connected and producing a third electrical output if said first and second electrical outputs are closer in time than a predetermined time, and alarm means to which said third electrical output is connected and providing an alarm if a plurality of said first and second electrical outputs are closer in time than said predetermined time.
Claim 3
Dependent Claim
24 words
Apparatus as set forth in claim 1 wherein said alarm means produces an additional signal, and wherein said alarm and said additional signal alternate.
Claim 4
Dependent Claim
16 words
Apparatus as set forth in claim 2 wherein said alarm means comprises a visual alarm means.
References Cited (Backward Citations)
US3877467A
Cited
US3867934A
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US3911899A
Cited
US4206754A
Cited
US4187842A
Cited
US4318399A
Cited
US4766894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |