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1. (WO2013166467) LIGHT WAVELENGTH SELECTION FOR AVOIDANCE OF SURGICAL DYES
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Claims

The invention claimed is:

1. A tissue oximetry device comprising:

a processor;

a memory coupled to the processor;

a plurality of light sources configured to be controlled by the processor, wherein the light sources are configured to generate and emit at least two wavelengths of light longer than 730 nanometers; and

a plurality of detectors configured to be controlled by the processor, wherein the processor is configured to:

control the plurality of light sources to generate and emit the light into tissue, control the plurality of detectors to detect the light subsequent to reflection of the light from the tissue,

control the plurality of detectors to generate reflectance data for the tissue based on detection of the light by the plurality of detectors, and

determine the oxygen saturation for the tissue based on the reflectance data.

2. The tissue oximetry device of claim 1 wherein the at least two wavelengths are approximately 760 nanometers and 850 nanometers.

3. The tissue oximetry device of claim 1 wherein the processor is configured to determine concentrations of oxygenated hemoglobin and deoxygenated hemoglobin in the tissue by solving a set of reflectance coefficient equations from the reflectance data for the at least two wavelengths.

4. The tissue oximetry device of claim 1 wherein the plurality of light sources is configured to generate and emit at least three wavelengths of light longer than 730 nanometers.

5. The tissue oximetry device of claim 4 wherein the at least three wavelengths are approximately 760 nanometers, 810 nanometers, and 850 nanometers.

6. The tissue oximetry device of claim 1 wherein the plurality of light sources is configured to generate and emit at least four wavelengths of light longer than

730 nanometers.

7. The tissue oximetry device of claim 6 wherein the at least four wavelengths are approximately 760 nanometers, 810 nanometers, 850 nanometers, and 900 nanometers.

8. The tissue oximetry device of claim 1 wherein the at least two wavelengths are on either side of the isosbestic point.

9. The tissue oximetry device of claim 1 wherein one of the at least two wavelengths is approximately at the isosbestic point.

10. A tissue oximetry device comprising:

a processor;

a memory coupled to the processor;

a plurality of light sources configured to be controlled by the processor, wherein the light sources are configured to generate and emit at least two wavelengths of light that are longer than wavelengths of primary absorption peaks of methylene blue; and

a plurality of detectors configured to be controlled by the processor, wherein the processor is configured to:

control the plurality of light sources to generate and emit the light into tissue;

control the plurality of detectors to detect the light subsequent to reflection of the light from the tissue;

control the plurality of detectors to generate reflectance data for the tissue based on detection of the light by the plurality of detectors; and

determine the oxygen saturation for the tissue based on the reflectance data.

11. The tissue oximetry device of claim 10 wherein the at least two wavelengths of light are longer than wavelengths of primary absorption peaks of povidone-iodine.

12. The tissue oximetry device of claim 10 wherein the at least two wavelengths are approximately 760 nanometers and 850 nanometers.

13. The tissue oximetry device of claim 10 wherein the processor is configured to determine concentrations of oxygenated hemoglobin and deoxygenated hemoglobin in the tissue by solving a set of reflection coefficient equations from the reflectance data for the at least two wavelengths.

14. The tissue oximetry device of claim 10 wherein the plurality of light sources is configured to generate and emit at least three wavelengths of light longer than 730 nanometers.

15. The tissue oximetry device of claim 14 wherein the at least three wavelengths are approximately 760 nanometers, 810 nanometers, and 850 nanometers.

16. The tissue oximetry device of claim 10 wherein the plurality of light sources is configured to generate and emit at least four wavelengths of light longer than 730

nanometers.

17. The tissue oximetry device of claim 16 wherein the at least four wavelengths are approximately 760 nanometers, 810 nanometers, 850 nanometers, and 900 nanometers.

18. The tissue oximetry device of claim 10 wherein the at least two wavelengths are on either side of the isosbestic point.

19. The tissue oximetry device of claim 10 wherein one of the at least two wavelengths is approximately at the isosbestic point.