US6374129B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motion compatible sensor for non-invasive optical blood analysis
Assignee: Nellcor Puritan Bennett LLC
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Filing: 1999-07-07
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Granted: 2002-04-16
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Expires: 2019-07-07
Abstract
Abstract A non-invasive optical sensor which uses the motion signal to calculate the physiological characteristic being measured. For pulse oximetry, a least squares or a ratio-of-ratios technique can be applied to the motion signal itself. This is made possible by selecting a site on the patient where variations in motion produce signals of two wavelengths which are sufficiently correlated. In particular, it has been determined that a sensor placed on a nail, in particular a thumbnail, exhibits the characteristics of having the red and infrared signals correlated when used for pulse oximetry, and the resulting signals correlate to arterial oxygen saturation.
Inventors
- 👤 Rodney Chin
- 👤 Paul Mannheimer
- 👤 Ross Flewelling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 23:12
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/14552; A61B5/68; A61B5/6801; A61B5/6813; A61B5/6825; A61B5/6826; A61B5/683; A61B5/6832; A61B5/6833; A61B5/6838; A61B5/72; A61B5/7203; A61B5/7207
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
An optical sensor comprising: a sensor configured to attach to a patient; an emitter connected to said sensor; a detector connected to said sensor and spaced from said emitter to detect reflectance signals; at least one optical element connected to said sensor to facilitate transmittance signals; and processing means for utilizing said transmittance signals to process signals produced predominantly by cardiac pulses, and utilizing said reflectance signals to process signals produced predominantly by non-cardiac blood pulses.
Claim 2
Dependent Claim
76 words
An optical sensor comprising: a sensor configured to attach to a patient; an emitter connected to said sensor; a detector connected to said sensor and spaced from said emitter to detect reflectance signals; at least one optical element connected to said sensor to facilitate transmittance signals; and processing means for utilizing said transmittance signals to process signals produced predominantly by cardiac pulses, and utilizing said reflectance signals to process signals produced predominantly by non-cardiac blood pulses.
Claim 3
Dependent Claim
66 words
An optical sensor comprising: a sensor configured to attach to a patient; an emitter connected to said sensor; a detector connected to said sensor and spaced from said emitter to detect reflectance signals; at least one optical element connected to said sensor to facilitate transmittance signals; and means for allowing the selective activation of said detector to use said reflectance signals in the presence of motion.
Claim 4
Dependent Claim
66 words
An optical sensor comprising: a sensor configured to attach to a patient; an emitter connected to said sensor; a detector connected to said sensor and spaced from said emitter to detect reflectance signals; at least one optical element connected to said sensor to facilitate transmittance signals; and means for allowing the selective activation of said detector to use said reflectance signals in the presence of motion.
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) | 2005-04-15 | 2005-10-15 | 2006-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2009-04-15 | 2009-10-15 | 2010-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2013-04-15 | 2013-10-15 | 2014-04-16 | $7700.00 | Window Closed / Lapsed |