HYBRID OPTICAL DELIVERY SYSTEM FOR PHOTOPLETHYSMOGRAPHY
First Claim
1. ) A photoplethysmographic measurement apparatus for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising:
- a plurality of separate emitters, wherein each emitter produces a light signal having a unique spectral content, said emitters separated into two sets of at least one emitter each;
a sensor which makes direct contact with the tissue-under-test and provides an output aperture through which light signals are delivered to the tissue-under-test;
housing means for housing each of the two sets of emitters in two separate locations, said housing means comprising a first housing means located proximal to said sensor and a second housing means located some distance from said first housing means;
means for transporting said light signals from said first and said second housing means to said sensor;
means for guiding the light signals from said first and second housing means through said output aperture to be incident on the tissue-under-test;
means for receiving a portion of the light signal exiting the tissue-under-test and converting said received light signal to an electronic signal indicative of the said received light signal;
means for processing said received light signal to determine one or more blood analyte levels or one or more hemodynamic parameters.
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Accused Products
Abstract
A hybrid optical system for photoplethysmographic measurements is disclosed. The system delivers light from a plurality of emitters to the tissue-under-test. A set of one or more of the emitters resides in close proximity to the sensor. A second set of one or more emitters resides at some distance from the sensor with the light from this second set of emitters being delivered to the sensor by a light pipe typically consisting of a fiber optic cable. This invention allows the photoplethysmographic instrument designer to use two or more different types of emitters in the same photoplethysmographic device while still generating a technically feasible and cost effective design.
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Citations
22 Claims
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1. ) A photoplethysmographic measurement apparatus for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, comprising:
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a plurality of separate emitters, wherein each emitter produces a light signal having a unique spectral content, said emitters separated into two sets of at least one emitter each;
a sensor which makes direct contact with the tissue-under-test and provides an output aperture through which light signals are delivered to the tissue-under-test;
housing means for housing each of the two sets of emitters in two separate locations, said housing means comprising a first housing means located proximal to said sensor and a second housing means located some distance from said first housing means;
means for transporting said light signals from said first and said second housing means to said sensor;
means for guiding the light signals from said first and second housing means through said output aperture to be incident on the tissue-under-test;
means for receiving a portion of the light signal exiting the tissue-under-test and converting said received light signal to an electronic signal indicative of the said received light signal;
means for processing said received light signal to determine one or more blood analyte levels or one or more hemodynamic parameters. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. ) A photoplethysmographic measurement apparatus for measuring the concentrations of a plurality of blood analytes, in a tissue-under-test, comprising:
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a plurality of light emitters, said emitters separated into two sets of at least one emitter each;
a sensor which makes direct contact with the tissue-under-test and provides an output aperture through which light signals are delivered to the tissue-under-test;
a photo-detector which receives a portion of the remaining light signal output from the tissue-under-test and converts said light signal to an electronic signal indicative of said light signal incident on the photo-detector;
a processing means which converts said electronic signal into blood analyte levels wherein said blood analytes includes at least two of the group comprising;
oxyhemoglobin, carboxyhemoglobin, methemoglobin, reduced hemoglobin, and reduced hemoglobin;
an output means that generates a user readable output of said blood analyte levels;
housing means for housing each of the said two sets of emitters in two separate locations, said housing means comprising a first housing means located proximal to said sensor and a second housing means located some distance from said sensor;
means for transporting said light signals from said second said housing means to said sensor;
means for guiding all of said light signals through said output aperture;
- View Dependent Claims (12)
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13. ) In a photoplethysmographic measurement system, a method for measuring one or more blood analyte levels or one or more hemodynamic parameters in a tissue-under-test, said method comprising the steps of:
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providing a plurality of separate emitters, wherein each emitter produces a light signal having a unique spectral content, said emitters separated into two sets of at least one emitter each;
providing a sensor which makes direct contact with the tissue-under-test and providing an output aperture through which light signals are delivered to the tissue-under-test;
providing a housing means for housing each of the two sets of emitters in two separate locations, said housing means comprising a first housing means located proximal to said sensor and a second housing means located some distance from said first housing means;
providing a means for transporting said light signals from said first and said second housing means to said sensor;
guiding the light signals from said first and second housing means through said output aperture to be incident on the tissue-under-test;
providing a means for receiving a portion of the light signal exiting the tissue-under-test and converting said received light signal to an electronic signal indicative of the said received light signal;
processing said received light signal to determine one or more blood analyte levels or one or more hemodynamic parameters. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification