Optical sensing device for use in a medical device
First Claim
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1. An optical device for an implantable medical device comprising:
- a substrate;
a well in the substrate having sidewalls and a bottom surface;
a reflective coating on at least one of the bottom surface and the sidewalls of the well;
a light emitting diode mounted on the flat bottom surface of the well; and
a photodetector in the substrate and configured for receiving light emitted by the light emitting diode,wherein the substrate comprises an upper substrate portion bonded to a lower substrate portion, the photodetector being in the lower substrate portion.
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Abstract
A reflectance-type optical sensor includes one or more photodiodes formed in a semiconductor substrate. A well having sidewalls and a bottom is formed in the top surface of the substrate, and a reflective layer is formed on the sidewalls and bottom. A light-emitting diode (LED) is mounted in the well, so that light emitted laterally and rearwardly from the LED strikes the sidewalls or bottom and is redirected in a direction generally perpendicular to the top surface of the substrate. The optical sensor can be fabricated using microelectromechanical systems (MEMS) fabrication techniques.
29 Citations
42 Claims
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1. An optical device for an implantable medical device comprising:
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a substrate; a well in the substrate having sidewalls and a bottom surface; a reflective coating on at least one of the bottom surface and the sidewalls of the well; a light emitting diode mounted on the flat bottom surface of the well; and a photodetector in the substrate and configured for receiving light emitted by the light emitting diode, wherein the substrate comprises an upper substrate portion bonded to a lower substrate portion, the photodetector being in the lower substrate portion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. An optical sensing device for an implantable medical device comprising:
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a substrate having a generally planar top surface; a plurality of wells extending into the substrate from the top surface, each well having inclined sidewalls and a bottom surface; a plurality of light emitting diodes, each of the light emitting diodes mounted on the bottom surface of a different one of the wells; a reflective metal coating on at least one of the bottom surface and the sidewalls of the wells; and a photodetector in the substrate adjacent the plurality of wells, wherein the substrate comprises an upper substrate portion bonded to a lower substrate portion, the photodetector being in the lower substrate portion. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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30. An implantable medical device comprising:
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a housing having a wall with a plurality of windows; a plurality of optical reflectometers, each reflectometer positioned adjacent to one of the windows and comprising; a substrate having a generally planar top surface; a plurality of wells extending into the substrate from the top surface, each well having inclined sidewalls and a bottom surface; a plurality of light emitting diodes, each of the light emitting diodes mounted on the bottom surface of a different one of the wells; a reflective metal coating on at least one of the bottom surface and the sidewalls of the wells; and a photodetector in the substrate adjacent the plurality of wells, wherein the substrate comprises an upper substrate portion bonded to a lower substrate portion, the photodetector being in the lower substrate portion. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification