US4697450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas monitor having trend indicators
Assignee: Sensormedics Corp
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Filing: 1986-12-29
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Granted: 1987-10-06
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Expires: 2006-12-29
Abstract
Abstract An improved device for determining the trend of the partial pressure of a gas, such as oxygen or carbon dioxide, which diffuses outwardly through a patient's skin. The device, such as a cutaneous gas monitor, generates over time a series of partial pressure input values that are compared to one another for determining a trend in the partial pressure. This trend is communicated to the operator of the device.
Inventors
- 👤 Thomas E. Bachman
- 👤 Larry S. McDavid
- 👤 David M. Trueblood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:46
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0062
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
124 words
A cutaneous gas monitor system comprising: means for sampling a gas mixture; means for determining a substanially current partial pressure of a constituent gas in the gas mixture; means for recording a series of stored partial pressures; means for adjustably selecting a historical value using the series of stored partial pressures; means for inputting at least one adjustably selected reference value to the monitor; means for comparing the current partial pressure, the historic value and the selected reference value to determine when the trend of the current partial pressure as a function of time exceeds the selected reference value; a display means for signalling the trend of the current partial pressure when the trend as a function of time exceeds the selected reference value.
Claim 2
Dependent Claim
124 words
A cutaneous gas monitor system comprising: means for sampling a gas mixture; means for determining a substanially current partial pressure of a constituent gas in the gas mixture; means for recording a series of stored partial pressures; means for adjustably selecting a historical value using the series of stored partial pressures; means for inputting at least one adjustably selected reference value to the monitor; means for comparing the current partial pressure, the historic value and the selected reference value to determine when the trend of the current partial pressure as a function of time exceeds the selected reference value; a display means for signalling the trend of the current partial pressure when the trend as a function of time exceeds the selected reference value.
Claim 3
Dependent Claim
67 words
The monitor system of claim 1 wherein the display means comprises a first and second indicator, the first indicator activating when the trend in the current partial pressure as a function of time exceeds, positively, a first adjustably selected reference value, and the second indicator activating when the trend in the current partial pressure as a function of time exceeds, negatively, a second adjustably selected reference value,
Claim 4
Dependent Claim
34 words
The monitor system of claim 1 wherein each sucessively stored partial pressure is a function of the current partial pressure for a selected interval of time proceeding the recording of the stored partial pressure.
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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) | 1990-10-05 | 1991-04-06 | 1991-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-05 | 1995-04-06 | 1995-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-05 | 1999-04-06 | 1999-10-06 | $7700.00 | Window Closed / Lapsed |