Multiple wavelength sensor emitters
A physiological sensor has light emitting sources, each activated by addressing at least one row and at least one column of an electrical grid. The light emitting sources are capable of transmitting light of multiple wavelengths and a detector is responsive to the transmitted light after attenuation by body tissue.
1. A physiological monitoring device comprising:
at least two LEDs, the at least two LEDs configured to emit light of at least two different wavelengths;
at least one detector configured to detect at least a portion of the light emitted from the at least two LEDs after at least a portion of the light has been attenuated by tissue, the at least one detector configured to output at least one signal responsive to the detected light;
a light block surrounding the at least one detector and configured to be disposed within a housing of the physiological monitoring device, the light block forming a cavity, the light block comprising a light-absorbing material, the light block including only one opening through which light is configured to pass, an area of the opening being smaller than a surface area of a facing surface of the at least one detector, the light absorbing material forming at least an edge of the only one opening; and
a processor configured to receive and process one or more signals responsive to the outputted at least one signal and determine a physiological parameter of a user responsive to the one or more signals.
2. The physiological monitoring device of claim 1 , wherein the at least two LEDs comprises at least eight LEDs.
3. The physiological monitoring device of claim 2 , wherein the at least eight LEDs comprises at least two LEDs of the same wavelength.
4. The device of claim 2 , wherein the at least eight LEDs comprises at least two LEDs of the same wavelength.
5. The physiological monitoring device of claim 1 , wherein the at least two LEDs comprises at least twelve LEDs.
6. The physiological monitoring device of claim 1 , wherein multiple LEDs of the at least two LEDs are configured for concurrent activation.
7. The physiological monitoring device of claim 1 , wherein the at least one detector comprises at least two detectors.
8. The physiological monitoring device of claim 1 , further comprising an electromagnetic interference shield positioned between the at least two LEDs and the at least one detector.
9. The physiological monitoring device of claim 1 , wherein the light block is a substantially rectangular enclosure.
10. The physiological monitoring device of claim 1 , wherein the light block comprises a base, a plurality of side walls, and a top.
11. The physiological monitoring device of claim 1 , wherein the area of the opening is less than half a surface area of a top of the light block.
12. The physiological monitoring device of claim 1 , wherein the opening is screen-less.
13. The physiological monitoring device of claim 1 , wherein the light block comprises an aperture sized to accept the at least one detector, wherein the aperture is different from the opening.
14. A method for determining a physiological parameter of a living patient, the method comprising:
positioning a sensor with respect to body tissue of a living patient, the sensor comprising at least two LEDs, at least one detector, a light block surrounding the at least one detector, the at least two LEDs configured to emit light of at least two different wavelengths, the light block forming a cavity, the light block comprising a light-absorbing material, the light block including only one opening through which light is configured to pass, an area of the opening being smaller than a surface area of a facing surface of the at least one detector, the light absorbing material forming at least an edge of the only one opening;
activating the at least two LEDs;
detecting, at the at least one detector, at least a portion of the light emitted from the at least two LEDs after at least a portion of the light has been attenuated by the body tissue, passed through a transparent medium, and passed through the opening of the light block, wherein the at least one detector outputs at least one signal responsive to the detected light, wherein the transparent medium is positioned in an optical path between the at least two LEDs and the at least one detector; and
determining a physiological parameter of the living patient responsive to the outputted at least one signal.
15. The method of claim 14 , wherein the at least two LEDs comprises at least eight LEDs.
16. The method of claim 15 , wherein the at least eight LEDs comprises at least two LEDs of the same wavelength.
17. The method of claim 14 , wherein the at least two LEDs comprises at least twelve LEDs.
18. The method of claim 14 , wherein said activating the at least two LEDs comprises concurrently activating multiple LEDs of the at least two LEDs.
19. The method of claim 14 , wherein the at least one detector comprises at least two detectors.
20. The method of claim 14 , wherein the sensor further comprises an electromagnetic interference shield positioned between the at least two LEDs and the at least one detector.
21. The method of claim 14 , wherein the light block is a substantially rectangular enclosure.
22. The method of claim 14 , wherein the light block comprises a shoebox structure.
23. The method of claim 14 , wherein the opening is screen-less.
24. The method of claim 14 , wherein the light block comprises an aperture sized to accept the at least one detector, wherein the aperture is different from the opening.
25. The method of claim 14 , wherein the at least a portion of the light passes through the transparent medium after the at least a portion of the light has been attenuated by the body tissue.
26. The method of claim 14 , wherein the light block is configured to be disposed within a housing of the physiological monitoring device.
27. A physiological sensor comprising:
a housing;
at least two LEDs, the at least two LEDs configured to emit light of at least two different wavelengths;
at least one detector configured to detect at least a portion of the light emitted from the at least two LEDs after at least a portion of the light has been attenuated by tissue, the at least one detector configured to output at least one signal responsive to the detected light; and
a light block that is at least partially enclosed, the light block surrounding the at least one detector, the light block forming a cavity, the light block comprising a light-absorbing material, the light block including only one opening through which light is configured to pass, an area of the opening being smaller than a surface area of a facing surface of the at least one detector, the light absorbing material forming at least an edge of the only one opening, and_the light block configured to be disposed within the housing.
28. The sensor of claim 27 , wherein the at least two LEDs comprises at least eight LEDs.
29. The sensor of claim 27 , further comprising an electromagnetic interference shield positioned between the at least two LEDs and the at least one detector.
30. The sensor of claim 27 , wherein the light block comprises a shoebox structure.