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 for emitting light in the electromagnetic spectrum of the infrared wavelengths;
an integrated CMOS semiconducting component chip mounted in the carriage housing which includes;
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;
an amplifier for amplifying the signal from the at least one photodiode;
a microprocessing unit for processing the amplified signals into at least one of pulse oximetry value and plethymographic waveforms;
a light emitting diode control operationally connected to the microprocessing unit that controls light emissions from the first and second light emitting diodes; and
a timing circuit that coordinates processing the signals generated by the photodiode and operations of the light emitting diodes.
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
18 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 for emitting light in the electromagnetic spectrum of the infrared wavelengths; an integrated CMOS semiconducting component chip mounted in the carriage housing which includes; 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; an amplifier for amplifying the signal from the at least one photodiode; a microprocessing unit for processing the amplified signals into at least one of pulse oximetry value and plethymographic waveforms; a light emitting diode control operationally connected to the microprocessing unit that controls light emissions from the first and second light emitting diodes; and a timing circuit that coordinates processing the signals generated by the photodiode and operations of the light emitting diodes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 15, 16)
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13. A method of measuring blood oxygen comprising:
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emitting pulses of red light from a first LED 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 integrally formed on a CMOS semiconductor chip mounted in the carriage housing and generating electrical signals; and on said CMOS semiconductor chip, digitizing the electrical signals from the photodiode and processing the digitized electrical signals into a blood oximetry value with an analog-to-digital converter and a processing circuit integrally formed on the CMOS semiconductor chip. - View Dependent Claims (14)
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17. A medical pulse oximetry sensor comprising:
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a housing configured to fit a portion of a patient'"'"'s anatomy with oxygenated blood throughput; a first light emitting diode mounted in the housing, the first light emitting diode emitting light of a first spectrum; a second light emitting diode mounted in the housing, the second light emitting diode emitting light of a second spectrum; an integrated CMOS semiconductor component chip mounted in the housing and including integrally formed thereon; a photodiode which detects light from the first and second light emitting diodes which has passed through the portion of the patient'"'"'s anatomy, an amplifier which amplifies signals from the photodiode, an analog-to-digital converter which digitizes the amplified signals, and a light emitting diode controller which controls the first and second light emitting diodes. - View Dependent Claims (18)
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Specification