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US4883353A
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Pulse oximeter
Assignee: Puritan Bennett Corp
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Filing: 1988-02-11
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Granted: 1989-11-28
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Expires: 2008-02-11
Abstract
Abstract A pulse oximeter having a sensor responsive to light transmitted through an area of blood flow which is optically absorbed by hemoglobin for producing a pulsatile waveform indicating the current pulsatile component of blood flow. A process waveform is created for tracking the process of the oximeter during its determination of a maximum and a minimum value of the pulsatile waveform, which is used for calculating the saturation of oxygen.
Inventors
- 👤 Kenneth A. Hausman
- 👤 Edwin B. Merrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:14
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/02; A61B5/024; A61B5/02416; A61B5/02427; A61B5/02433; A61B5/14552
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
24 words
oxygenated blood, onto an output display. 17. The method in accordance with claim 16 further comprising the step of determining a maximum and a
Claim 2
Dependent Claim
49 words
minimum value of said pulsatile waveform. 18. The method in accordance with claim 16 wherein said displayable process waveform comprises: an upper envelope for tracking the process of determining said maximum value of the pulsatile waveform; and a lower envelope for tracking the process of determining said minimum value
Claim 3
Dependent Claim
23 words
of the pulsatile waveform. 19. The method in accordance with claim 18 further comprising the step of uniquely coloring said upper envelope and
Claim 4
Dependent Claim
32 words
said lower envelope of the displayable process waveform. 20. The method in accordance with claim 16 further comprising the step of determining a predetermined percentage of said amplitude of said pulsatile waveform.
Claim 5
Dependent Claim
43 words
The method in accordance with claim 20 further comprising the steps of identifying a maximum value of said pulsatile waveform and recovering a pulsatile waveform value at a predetermined time period prior to said maximum value for determining said predetermined percentage of said
Claim 6
Dependent Claim
29 words
amplitude. 22. The method in accordance with claim 16 further comprising the step of correcting any amplitude errors of said pulsatile waveform that are caused by a wandering baseline.
References Cited (Backward Citations)
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 |