US6018673A
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: 1996-10-10
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Granted: 2000-01-25
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Expires: 2016-10-10
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
2026-10-31 14:40
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: 17
Claim 1
Independent Claim
52 words
A system for determining an arterial blood constituent of a patient, comprising: a processing device in communication with a detector to process a detector signal from said detector representing a motion artifact pulse, said motion artifact pulse having been generated by movement intiated by said patient, for determination of said blood constituent.
Claim 2
Independent Claim
52 words
A system for determining an arterial blood constituent of a patient, comprising: a processing device in communication with a detector to process a detector signal from said detector representing a motion artifact pulse, said motion artifact pulse having been generated by movement intiated by said patient, for determination of said blood constituent.
Claim 3
Dependent Claim
16 words
The system of claim 1 wherein at least two points on said detector signal are used.
Claim 4
Dependent Claim
22 words
The system of claim 1 further comprising: a sensor for attaching to said patient, including a radiation emitter and a radiation detector.
Claim 5
Dependent Claim
28 words
The system of claim 3 wherein said sensor comprises a sensor body containing said emitter and said detector configured to fit entirely on a nail of a patient.
Claim 6
Dependent Claim
12 words
The system of claim 3 wherein said sensor is a reflectance sensor.
Claim 7
Dependent Claim
18 words
The system of claim 5 wherein said emitter and said detector are separated by less than 10 millimeters.
Claim 8
Dependent Claim
22 words
The system of claim 3 where in said sensor includes a sensor body preformed to conform to the curvature of a nail.
Claim 9
Dependent Claim
32 words
The system of claim 3 wherein said detector detects reflectance signals from said sensor, and further comprising at least one additional optical element mounted in said sensor body to facilitate transmittance signals.
Claim 10
Dependent Claim
15 words
The system of claim 8 wherein said additional optical element is an additional radiation detector.
Claim 11
Dependent Claim
15 words
The system of claim 8 wherein said additional optical element is an additional radiation emitter.
Claim 12
Dependent Claim
22 words
The system of claim 8 further comprising means for cross-reference calibration of said reflectance and transmittance signals during periods of minimal motion.
Claim 13
Dependent Claim
12 words
The system of claim 3 wherein said sensor is an oximeter sensor.
Claim 14
Dependent Claim
47 words
The system of claim 1 wherein said processing device further comprises: a first processing unit configured to determine a physiological parameter from a cardiac derived plethysmogram from said detector; and a second processing unit configured to determine said physiological parameter from a motion signal from said detector.
Claim 15
Dependent Claim
28 words
The system of claim 13 further comprising a control unit configured to utilize said first and second processing units responsive to a motion content of said detector signals.
Claim 16
Dependent Claim
20 words
The system of claim 14 wherein said control unit is configured to switch between said first and second processing units.
Claim 17
Dependent Claim
21 words
The system of claim 14 wherein said control unit is configured to combine signals from said first and second processing units.
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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) | 2003-01-24 | 2003-07-26 | 2004-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-01-24 | 2007-07-26 | 2008-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-01-24 | 2011-07-26 | 2012-01-25 | $7700.00 | Window Closed / Lapsed |