US5099836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intermittent oxygen delivery system and cannula
Assignee: CREDITANSTALT CORPORATE FINANCE Inc
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Filing: 1990-01-17
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Granted: 1992-03-31
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Expires: 2010-01-17
Abstract
Abstract An improved system for delivering oxygen on demand to a user comprises a pressure transducer for sensing pressures during the breathing cycle of a user and for creating an electrical signal proportional to said sensed pressures, an electronic amplifier for amplifying the signal to at least 10,000 times the original signal strength, electronic filters for regulating the amplitude of the signal and for correcting the point of the signal where expiration stops and inspiration begins to correspond to zero respiratory pressure, an on/off switching circuit and cooperating valve drive circuit for switching to an on condition in response to a preselected first pressure and to an off condition in response to a preselected second pressure, and a valve driven by the valve drive circuit means for directing oxygen from an oxygen source to a user.
Inventors
- 👤 Robert O. Rowland
- 👤 Thomas C. Loescher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:57
CPC Classifications
A; A61; A61M; A61M16/00; A61M16/06; A61M16/0666; A61M16/0051; A61M16/021; A61M16/022; A61M16/024; A61M16/0672; A61M16/0677; A61M16/08; A61M16/0816; A61M16/0841; A61M16/0858; A61M16/0003; A61M2016/0015; A61M2016/0018; A61M2016/0021; A61M2016/0027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
111 words
A nasal cannula comprising: an elongated hollow tubular cannula body having a single port at each opposite end thereof, each port for being attached to or receiving a single tube, respectively, and a single pair of nasal tubes integral with and extending from said cannula body, each of said nasal tubes having a first port at an end thereof and a second port on an exterior sidewall thereof, and an internal divider wall extending across the interior of each of said nasal tubes and defining a first passageway extending between the hollow cannula body and said first port and a second passageway extending between said first port and said second port.
Claim 2
Dependent Claim
111 words
A nasal cannula comprising: an elongated hollow tubular cannula body having a single port at each opposite end thereof, each port for being attached to or receiving a single tube, respectively, and a single pair of nasal tubes integral with and extending from said cannula body, each of said nasal tubes having a first port at an end thereof and a second port on an exterior sidewall thereof, and an internal divider wall extending across the interior of each of said nasal tubes and defining a first passageway extending between the hollow cannula body and said first port and a second passageway extending between said first port and said second port.
Claim 3
Dependent Claim
109 words
A nasal cannula comprising: an elongated tubular cannula body having a gas supply port at a first end thereof and a pressure sensing port at a second end thereof, a pair of nasal tubes extending from said cannula body and having an outlet port at the end thereof opposite said cannula body, and a wall member secured in said cannula body and forming a first and a second chamber therein, said wall member extending into each nasal tube to form a first and a second passageway therein, wherein said first chamber is in communication with said first passageway and said second chamber is in communication with said second passageway.
Claim 4
Dependent Claim
109 words
A nasal cannula comprising: an elongated tubular cannula body having a gas supply port at a first end thereof and a pressure sensing port at a second end thereof, a pair of nasal tubes extending from said cannula body and having an outlet port at the end thereof opposite said cannula body, and a wall member secured in said cannula body and forming a first and a second chamber therein, said wall member extending into each nasal tube to form a first and a second passageway therein, wherein said first chamber is in communication with said first passageway and said second chamber is in communication with said second passageway.
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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) | 1995-03-31 | 1995-09-30 | 1996-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-31 | 1999-09-30 | 2000-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-31 | 2003-09-30 | 2004-03-31 | $7700.00 | Window Closed / Lapsed |