System and method for creating a stable optical interface
First Claim
1. A system for creating a stable and reproducible optical interface in an optical sensor system for measuring blood glucose levels in biological tissue comprises:
- an optical interferometer sensor utilizing a beam of light;
an interferometer connected to the optical sensor;
a computer connected to an optical receiver associated with the interferometer; and
a disposable optical lens apparatus connected to the optical sensor, wherein the disposable apparatus comprises;
a focusing lens; and
an optical window connected to the focusing lens;
wherein the disposable apparatus is attachable to a surface area of biological tissue by an adhesive.
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Accused Products
Abstract
A system and a method for creating a stable and reproducible interface of an optical sensor system for measuring blood glucose levels in biological tissue include a dual wedge prism sensor attached to a disposable optic that comprises a focusing lens and an optical window. The disposable optic adheres to the skin to allow a patient to take multiple readings or scans at the same location. The disposable optic includes a Petzval surface placed flush against the skin to maintain the focal point of the optical beam on the surface of the skin. Additionally, the integrity of the sensor signal is maximized by varying the rotation rates of the dual wedge prisms over time in relation to the depth scan rate of the sensor. Optimally, a medium may be injected between the disposable and the skin to match the respective refractive indices and optimize the signal collection of the sensor.
110 Citations
24 Claims
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1. A system for creating a stable and reproducible optical interface in an optical sensor system for measuring blood glucose levels in biological tissue comprises:
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an optical interferometer sensor utilizing a beam of light;
an interferometer connected to the optical sensor;
a computer connected to an optical receiver associated with the interferometer; and
a disposable optical lens apparatus connected to the optical sensor, wherein the disposable apparatus comprises;
a focusing lens; and
an optical window connected to the focusing lens;
wherein the disposable apparatus is attachable to a surface area of biological tissue by an adhesive. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of using an optical system with an optical interferometer sensor and a disposable optical apparatus for measuring blood glucose levels in biological tissue comprises the steps of:
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attaching the disposable apparatus to a surface area of biological tissue using an adhesive;
coupling the optical sensor to the disposable apparatus; and
taking a blood glucose reading using the optical sensor. - View Dependent Claims (8, 9)
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10. A method for resolving variations in an optical path length of an optical sensor system having at least one wedge prism for measuring blood glucose levels in biological tissue comprises the following steps:
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taking a plurality of scans using the optical sensor system;
locating a first peak in a first scan of the plurality of scans;
locating a first peak in each subsequent scan of the plurality of scans;
normalizing each first peak in each subsequent scan against the first peak in the first scan; and
averaging the normalized scans to produce a resulting averaged scan. - View Dependent Claims (11)
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12. A method for resolving variations in an optical path length of an optical sensor system having at least one wedge prism for measuring blood glucose levels in biological tissue comprises the following steps:
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determining a threshold trigger; and
setting the optical sensor system to begin acquiring data once the threshold trigger is reached. - View Dependent Claims (13, 14, 15, 16, 17)
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18. A method for minimizing distortion of a depth scale of an optical sensor system having at least one wedge prism for measuring blood glucose levels in biological tissue comprises the step of setting an angular velocity of at least one wedge prism to a value such that a lateral position of a beam of light utilized by the optical sensor system on the biological tissue moves a distance that is less than a value equal to a diameter of the beam of light multiplied by a factor of ten, during a single depth scan.
- 19. A method for stabilizing a scan pattern of an optical sensor system having at least one wedge prism for measuring blood glucose levels in biological tissue comprises the step of setting an angular velocity of the at least one wedge prism to a non-integral value of a depth scan rate associated with the optical sensor system.
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22. A method for stabilizing a scan pattern of an optical sensor system having a plurality of wedge prisms for measuring blood glucose levels in biological tissue comprises the steps of:
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setting a first angular velocity associated with a first wedge prism to a harmonic integral of a second angular velocity associated with a second wedge prism, wherein the first angular velocity is at least one order of magnitude greater than the first angular velocity; and
setting the first angular velocity and the second angular velocity to non-harmonic integrals of a depth scan rate associated with the optical sensor system.
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23. A method for optimizing an amount of light entering and exiting an area of biological tissue, wherein the amount of light is associated with an optical sensor system placed on the area of biological tissue in order to measure blood glucose levels, comprising the steps of:
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coupling a Petzval surface to a bottom surface of the optical sensor system;
placing the optical sensor system on the surface area of biological tissue, such that the tissue wraps around the Petzval surface;
directing a beam of light through a focusing lens and the optical window, into the Petzval surface; and
maintaining a focal point of the beam of light at an interface of the Petzval surface and the area of biological tissue. - View Dependent Claims (24)
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Specification