Multi-stream data collection system for noninvasive measurement of blood constituents
The present disclosure relates to noninvasive methods, devices, and systems for measuring various blood constituents or analytes, such as glucose. In an embodiment, a light source comprises LEDs and super-luminescent LEDs. The light source emits light at at least wavelengths of about 1610 nm, about 1640 nm, and about 1665 nm. In an embodiment, the detector comprises a plurality of photodetectors arranged in a special geometry comprising one of a substantially linear substantially equal spaced geometry, a substantially linear substantially non-equal spaced geometry, and a substantially grid geometry.
1. A noninvasive optical physiological sensor comprising:
a plurality of emitters configured to emit light into tissue of a user;
a plurality of detectors configured to detect light that has been attenuated by tissue of the user, wherein the plurality of detectors comprise at least four detectors;
a housing configured to house at least the plurality of detectors in a circular portion of the housing; and
a lens configured to be located between tissue of the user and the plurality of detectors when the noninvasive optical physiological sensor is worn by the user, wherein the lens comprises a single outwardly protruding convex surface configured to cause tissue of the user to conform to at least a portion of the single outwardly protruding convex surface when the noninvasive optical physiological sensor is worn by the user and during operation of the noninvasive optical physiological sensor.
2. The noninvasive optical physiological sensor of claim 1 , wherein the plurality of detectors are arranged on a two-dimensional surface of the housing.
3. The noninvasive optical physiological sensor of claim 2 , wherein a first detector and a second detector of the plurality of detectors are arranged across from each other on opposite sides of a central point along a first axis, and a third detector and a fourth detector of the plurality of detectors are arranged across from each other on opposite sides of the central point along a second axis which is perpendicular to the first axis.
4. The noninvasive optical physiological sensor of claim 3 , wherein the lens is comprised of a rigid material.
5. The noninvasive optical physiological sensor of claim 4 , wherein the at least four detectors are evenly spaced from one another.
6. The noninvasive optical physiological sensor of claim 4 , wherein the lens is configured to reduce a mean path length of light traveling to the plurality of detectors.
7. The noninvasive optical physiological sensor of claim 4 , wherein the lens is configured to increase a signal to noise ratio of the noninvasive optical physiological sensor.
8. The noninvasive optical physiological sensor of claim 4 , wherein the lens is configured to increase a signal strength per area of the plurality of detectors.
9. An optical physiological measurement sensor comprising:
a plurality of emitters configured to emit light into tissue of a user;
a housing including a planar surface;
at least four detectors arranged on the planar surface of the housing, wherein the four detectors are arranged in a grid pattern; and
a lens forming a cover of the housing, wherein at least a portion of the lens protrudes from the housing and the lens comprises a single convex surface.
10. The optical physiological measurement sensor of claim 9 , wherein the lens is configured to cause tissue of the user to conform to at least a portion of the single convex surface when the optical physiological measurement sensor is worn by the user.
11. The optical physiological measurement sensor of claim 10 , wherein the four detectors are arranged in a grid pattern such that a first detector and a second detector are arranged across from each other on opposite sides of a central point along a first axis, and a third detector and a fourth detector are arranged across from each other on opposite sides of the central point along a second axis which is perpendicular to the first axis.
12. The optical physiological measurement sensor of claim 11 , wherein the lens is comprised of a rigid material.
13. The optical physiological measurement sensor of claim 12 , wherein the lens is configured to be positioned between the at least four detectors and tissue of a user when the optical physiological measurement sensor is worn by the user.
14. The optical physiological measurement sensor of claim 13 , wherein the lens is configured to press against and at least partially deform tissue of the user when the optical physiological measurement sensor is worn by the user.
15. The optical physiological measurement sensor of claim 14 , wherein the at least four detectors are evenly spaced from one another.
16. The optical physiological measurement sensor of claim 15 , wherein the lens is configured to reduce a mean path length of light traveling to the at least four detectors.
17. The optical physiological measurement sensor of claim 15 , wherein the lens is configured to increase a signal to noise ratio of the optical physiological measurement sensor.
18. The optical physiological measurement sensor of claim 15 , wherein the lens is configured to increase a signal strength per area of the at least four detectors.
19. The optical physiological measurement sensor of claim 9 , wherein the lens comprises a light concentration window.