Medical sensor with modulated encoding scheme
First Claim
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1. 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.
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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.
314 Citations
3 Claims
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1. A pulse oximeter sensor comprising:
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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. - View Dependent Claims (2, 3)
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Specification
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Current AssigneeNellcor Puritan Bennett Incorporated (Medtronic Plc)
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Original AssigneeNellcor Incorporated (Medtronic Plc)
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InventorsMerchant, Adnan I., Fein, Michael E., Bowden, Charles H., Bernstein, Michael J., Jenkins, David C., Venkatachalam, K. L.
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Primary Examiner(s)NASSER, ROBERT L
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Application NumberUS08/168,449Time in Patent Office1,299 DaysField of Search375/22, 375/237, 375/238, 340/870.24, 128/663, 128/664-666, 356/39-41US Class Current600/336CPC Class CodesA61B 2562/08 Sensors provided with means...A61B 5/0002 Remote monitoring of patien...A61B 5/14551 for measuring blood gasesA61B 5/7228 Signal modulation applied t...
