US5645059A
Expired / Lapsed
US
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Medical sensor with modulated encoding scheme
Assignee: Nellcor Puritan Bennett LLC
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Filing: 1993-12-17
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Granted: 1997-07-08
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Expires: 2013-12-17
Abstract
Abstract The present invention provides an encoding mechanism for a medical sensor which uses a modulated signal to provide the coded data to a remote analyzer. The modulated signal could be, for instance, a pulse width modulated signal or a frequency modulated signal. This signal is amplitude independent and thus provides a significant amount of noise immunity.
Inventors
- 👤 Michael E. Fein
- 👤 David C. Jenkins
- 👤 Michael J. Bernstein
- 👤 K. L. Venkatachalam
- 👤 Adnan I. Merchant
- 👤 Charles H. Bowden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:07
CPC Classifications
A; A61; A61B; A61B5/00; A61B5/145; A61B5/1455; A61B5/14551; A61B5/0002; A61B5/72; A61B5/7228; A61B2562/00; A61B2562/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A pulse oximeter sensor comprising: a first light emitting means for emitting light of a first known wavelength; means for sensing the light emitted by said first light emitting means; transmitting means for coupling said sensor to a remote oximeter; means, coupled to said transmitting means, for encoding said first known wavelength as a modulated signal, wherein said sensor is compatible with oximeters providing a current signal to read a resistance value in a sensor, said sensor providing compatibility by including in said means for encoding: means for causing said modulated signal to have an average voltage corresponding to a resistance value identifying said first known wavelength in response to a current received from an oximeter.
Claim 2
Dependent Claim
116 words
A pulse oximeter sensor comprising: a first light emitting means for emitting light of a first known wavelength; means for sensing the light emitted by said first light emitting means; transmitting means for coupling said sensor to a remote oximeter; means, coupled to said transmitting means, for encoding said first known wavelength as a modulated signal, wherein said sensor is compatible with oximeters providing a current signal to read a resistance value in a sensor, said sensor providing compatibility by including in said means for encoding: means for causing said modulated signal to have an average voltage corresponding to a resistance value identifying said first known wavelength in response to a current received from an oximeter.
Claim 3
Dependent Claim
47 words
The pulse oximeter sensor of claim 1 wherein said means for causing further comprises: means for alternately sinking said current in accordance with a first value of said modulated signal; and means for alternately blocking said current in accordance with a second value of said modulated signal.
Claim 4
Dependent Claim
21 words
The pulse oximeter sensor of claim 2 wherein said means for sinking and blocking comprises a transistor in an open-collector configuration.
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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) | 2000-07-07 | 2001-01-06 | 2001-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-07-07 | 2005-01-06 | 2005-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-07-07 | 2009-01-06 | 2009-07-08 | $7700.00 | Window Closed / Lapsed |