INTEGRATED PULSE OXIMETRY SENSOR
First Claim
1. A medical pulse oximetry sensor comprising:
- a carriage housing adapted to fit snugly about a portion of a subject'"'"'s anatomy with a relatively high oxygenated blood throughput;
a first light emitting diode mounted in the housing for emitting light in the electromagnetic spectrum of the red wavelengths;
a second light emitting diode mounted in the housing emitting light in the electromagnetic spectrum of the infrared wavelengths;
at least one photodiode for detecting incumbent light from the first and second light emitting diodes after the emitted light has passed through a blood oxygenated portion of a subject and generating electrical signals indicative thereof;
a processing circuit integrally formed on an integrated semiconducting component chip mounted in the carriage housing, the processing circuit processing the signals into one of a pulse oximetry value and plethysmographic waveforms from at least one of the wavelengths.
1 Assignment
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Accused Products
Abstract
In a medical pulse oximetry sensor (10) at least two light emitting diodes (16, 18) are disposed to emit red light and infrared light through a portion of a subject'"'"'s anatomy with a typically high oxygenated blood throughput. Typically, this area is also relatively narrow, to allow the light to pass through the area with acceptable attenuation, such as a finger or an earlobe. Light emitted from the LEDs (16, 18) is incumbent upon an integrated circuit (22) printed from a single CMOS substrate (21). The integrated circuit (22) includes all preprocessing and post-processing elements needed to convert the detected light signals into a pulse oximetry measurement. These elements include a photodetector (20), a photo pre-amplifier (40), a sampler/holder (42), an analog to digital converter (44), a microprocessor (46) a rangefinder (48), a timing control circuit (50) and an LED control circuit (52). By integrating all pre and post processing functions into the carriage housing (12), the system becomes more efficient, less expensive to manufacture, and more robust to ambient light and x-ray radiation.
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Citations
21 Claims
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1. A medical pulse oximetry sensor comprising:
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a carriage housing adapted to fit snugly about a portion of a subject'"'"'s anatomy with a relatively high oxygenated blood throughput; a first light emitting diode mounted in the housing for emitting light in the electromagnetic spectrum of the red wavelengths; a second light emitting diode mounted in the housing emitting light in the electromagnetic spectrum of the infrared wavelengths; at least one photodiode for detecting incumbent light from the first and second light emitting diodes after the emitted light has passed through a blood oxygenated portion of a subject and generating electrical signals indicative thereof; a processing circuit integrally formed on an integrated semiconducting component chip mounted in the carriage housing, the processing circuit processing the signals into one of a pulse oximetry value and plethysmographic waveforms from at least one of the wavelengths. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A method manufacturing a pulse oximetry sensor comprising:
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embedding at least first and second light emitting diodes into a carriage housing adapted to fit snugly about a portion of a subject'"'"'s anatomy with a relatively high oxygenated blood throughput; embedding an integrated circuit opposite the light emitting diodes, such that light emitted by the diodes must pass through the portion of the subject'"'"'s anatomy before impinging upon the integrated circuit, the integrated circuit including; at least one photodiode for detection of light signals from the at least two light emitting diodes and generating signals indicative thereof; an amplifier for amplifying the signals from the photodiode; digital conversion elements for digitizing the signals from the photodiode; a processing unit for processing the digital signals into the pulse oximetry value. - View Dependent Claims (19)
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20. A method of measuring blood oxygen comprising:
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emitting pulses of red light from a first LED (16) mounted in a carriage housing adapted to fit snugly about a portion of a subject'"'"'s anatomy with a relatively high oxygenated blood throughput; emitting pulses of infrared light from a second LED mounted in the carriage housing; receiving light from the LEDs which has traversed a blood oxygenated portion of a person with a photodiode mounted in the carriage housing and generating electrical signals; processing the electrical signals from the photodiode into a blood oximetry value with a processing circuit integrally formed on a semiconductor chip that is mounted in the carriage housing. - View Dependent Claims (21)
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Specification