Medical sensor with modulated encoding scheme
First Claim
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1. A pulse oximeter sensor comprising:
- a first emitter which emits light of a first known wavelength;
a photosensor for sensing the light emitted by the first emitter;
a transmitter for coupling said sensor to a remote oximeter;
an encoder for encoding a value indicative of said first known wavelength as a coded value;
a modulator, coupled to said transmitter, for providing said coded value as a modulated signal to said transmitter, wherein said transmitter is adapted to transmit said modulated signal to said remote oximeter for use in an oxygen saturation measurement.
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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.
267 Citations
15 Claims
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1. A pulse oximeter sensor comprising:
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a first emitter which emits light of a first known wavelength; a photosensor for sensing the light emitted by the first emitter; a transmitter for coupling said sensor to a remote oximeter; an encoder for encoding a value indicative of said first known wavelength as a coded value; a modulator, coupled to said transmitter, for providing said coded value as a modulated signal to said transmitter, wherein said transmitter is adapted to transmit said modulated signal to said remote oximeter for use in an oxygen saturation measurement. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for supplying a wavelength of a light emitter in a pulse oximeter transducer with a light emitter and photosensor to a pulse oximeter monitor, comprising the steps of:
encoding a value indicative of a wavelength of said light emitter as a modulated signal; and
transmitting said modulated signal to said pulse oximeter monitor.- View Dependent Claims (13, 14, 15)
Specification