Multi-stream emitter for noninvasive measurement of blood constituents
First Claim
1. A multi-stream emitter for a noninvasive, physiological device configured to transmit optical radiation in a tissue site, said emitter comprising:
- a set of optical sources comprising;
a top-emitting diode affixed to a first surface, anda side-emitting diode affixed to a second surface, wherein the first surface is approximately perpendicular to the second surface; and
a driver configured to;
drive the top-emitting diode to transmit first infrared optical radiation at a first power into a tissue site of a patient, wherein the top-emitting diode is configured to emit the first infrared optical radiation in a first direction substantially perpendicular to the first surface; and
drive the side-emitting diode to transmit second infrared optical radiation at a second power into the tissue site of the patient, wherein the side-emitting diode is configured to emit the second infrared optical radiation in a second direction substantially parallel to the second surface, and wherein the second power is greater than the first power;
enabling measurement of an analyte in the tissue site of the patient.
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Accused Products
Abstract
The present disclosure relates to an emitter that is suitable for a noninvasive blood constituent sensor. The emitter is configured as a point optical source that comprises a plurality of LEDs that emit a sequence of pulses of optical radiation across a spectrum of wavelengths. In some embodiments, the plurality of sets of optical sources may each comprise at least one top-emitting LED and at least one super luminescent LED. In some embodiments, the emitter comprises optical sources that transmit optical radiation in the infrared or near-infrared wavelengths suitable for detecting glucose. In order to achieve the desired SNR for detecting analytes like glucose, the emitter may be driven using a progression from low power to higher power. In addition, the emitter may have its duty cycle modified to achieve a desired SNR.
983 Citations
36 Claims
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1. A multi-stream emitter for a noninvasive, physiological device configured to transmit optical radiation in a tissue site, said emitter comprising:
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a set of optical sources comprising; a top-emitting diode affixed to a first surface, and a side-emitting diode affixed to a second surface, wherein the first surface is approximately perpendicular to the second surface; and a driver configured to; drive the top-emitting diode to transmit first infrared optical radiation at a first power into a tissue site of a patient, wherein the top-emitting diode is configured to emit the first infrared optical radiation in a first direction substantially perpendicular to the first surface; and drive the side-emitting diode to transmit second infrared optical radiation at a second power into the tissue site of the patient, wherein the side-emitting diode is configured to emit the second infrared optical radiation in a second direction substantially parallel to the second surface, and wherein the second power is greater than the first power;
enabling measurement of an analyte in the tissue site of the patient. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An emitter of a noninvasive optical sensor, the emitter configured to transmit optical radiation into a tissue site to be detected after attenuation by said tissue site and processed to determine one or more physiological parameters of a patient, said emitter comprising:
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an optical source;
including;a top-emitting diode having a first surface connected to an electrical contact, and a side-emitting diode having a second surface connected to an electrical contact; and a driver; configured to drive the top-emitting diode to transmit light at a first wavelength into the tissue site, wherein the top-emitting diode is configured to transmit light at the first wavelength in a first direction substantially perpendicular to the first surface; and configured to drive the side-emitting diode to transmit light at a second wavelength into the tissue site, wherein the side-emitting diode is configured to transmit light at the second wavelength in a second direction substantially parallel to the second surface. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A method of transmitting a stream of pulses of optical radiation in a tissue site, said method comprising:
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transmitting with a top-emitting diode affixed to a first surface, at a first power, at least one pulse of first infrared optical radiation having a first pulse width, wherein the top-emitting diode is configured to transmit light at the first infrared optical radiation in a first direction substantially perpendicular to the first surface; and transmitting with a side-emitting diode affixed to a second surface not parallel to the first surface, at a second power, at least one pulse of second infrared optical radiation, wherein the side-emitting diode is configured to transmit light at the second infrared optical radiation in a second direction substantially parallel to the second surface. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A light source for a noninvasive, physiological device configured to transmit optical radiation in a tissue site, said light source comprising:
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a set of optical sources, the set of optical sources comprising; a first emitting diode affixed to a first surface, and a side emitting diode affixed to a second surface, said second surface being in a non-parallel plane to said first surface; and a driver configured to; drive the first emitting diode to transmit first optical radiation into a tissue site of a patient, wherein the first emitting diode is configured to emit the first optical radiation in a first direction, and drive the second emitting diode to transmit second optical radiation into the tissue site of the patient, wherein the second emitting diode is configured to emit the second optical radiation in the first direction; wherein the first direction is generally toward the tissue site of the patient, wherein the first optical radiation is emitted at a first intensity and the second optical radiation is emitted at a second intensity, the second intensity be substantially greater than the first intensity. - View Dependent Claims (33, 34, 35, 36)
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Specification