Integrated scanning and ocular tomography system and method
First Claim
1. A method of measuring a thickness of a tissue, the method comprising:
- reflecting three wavelengths of light from the tissue by directing a measurement light beam along an optical path toward the tissue;
measuring an interference signal for each of the three wavelengths of the reflected light; and
determining a separation distance between positions of at least two reflecting tissue surfaces along the optical path by combining the measured signals.
6 Assignments
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Accused Products
Abstract
Systems and methods of the present invention measure at least one reflecting surface of an object disposed along an optical path. In some embodiments a measured optical interference signal for each of at least three wavelengths of reflected light may be used to determine a modulation of frequency components of a Fourier series. Frequency components of a Fourier series may be transformed to spatial components that describe intensities and positions of light reflected along an optical path.
Systems and methods of the present invention permit rapid measuring and may monitor corneal thickness during surgery. The invention may do so by integrating an ablation device and a measurement apparatus into a single system. An integrated scanning and monitoring system may include an ablative light source producing an ablative beam and a measurement light source producing a measurement beam.
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Citations
30 Claims
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1. A method of measuring a thickness of a tissue, the method comprising:
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reflecting three wavelengths of light from the tissue by directing a measurement light beam along an optical path toward the tissue;
measuring an interference signal for each of the three wavelengths of the reflected light; and
determining a separation distance between positions of at least two reflecting tissue surfaces along the optical path by combining the measured signals. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of treating a tissue, the method comprising:
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directing an ablative light beam to the tissue to form a desired shape in the tissue;
reflecting three wavelengths of light from the tissue by directing a measurement light beam along an optical path toward the tissue;
measuring an interference signal for each of the three wavelengths of the reflected light; and
determining positions of at least two reflecting tissue surfaces along the optical path by combining the measured signals while the ablative light beam is directed toward the tissue. - View Dependent Claims (8, 9, 10)
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11. A method of treating a tissue, the method comprising:
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directing an ablative beam for ablating the tissue via a scanning device to the tissue;
directing a measurement beam for measuring a profile of the tissue via the scanning device to the tissue, wherein a path of the ablative beam and a path of the measurement beam are substantially concentric as directed onto the tissue. - View Dependent Claims (12, 13, 14)
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15. A system for measuring a thickness of a tissue, the system comprising:
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a light source emitting a measurement light beam, the measurement light beam directed along an optical path toward the tissue, three wavelengths of the light beam reflecting from the tissue;
an interferometer generating an interference signal for each of the three wavelengths of the measurement light beam reflected from the tissue; and
a processor determining a separation distance between positions of at least two reflecting tissue surfaces along the optical path by combining the interference signals. - View Dependent Claims (16, 17, 18, 19, 20)
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21. A system for treating a tissue, the system comprising:
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an ablative light source emitting an ablative light beam;
a light source emitting a measurement light beam, the measurement light beam directed along an optical path toward the tissue, three wavelengths of the light beam reflecting from the tissue;
an interferometer generating an interference signal for each of the three wavelengths of the measurement light beam reflected from the tissue; and
a processor controlling the ablative light beam and determining positions of at least two reflecting tissue surfaces along the optical path by combining the interference signals. - View Dependent Claims (22, 23)
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24. An apparatus for ablating tissue, the apparatus comprising:
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an ablative light source producing an ablative light beam;
a measurement light source producing a measurement light beam; and
a scanner receiving the ablative beam from the ablative light source and the measurement beam from the measurement light source, the scanner including optical elements for directing the ablative beam and the measurement beam to locations across the tissue so as to ablate the tissue with the ablative beam and measure a profile of the tissue with the measurement beam, a path of the ablative beam and a path of the measurement beam being substantially concentric at the tissue. - View Dependent Claims (25, 26)
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27. An apparatus for treating tissue comprising:
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an ablative light source producing an ablative beam;
a beam delivery device directing the ablative beam onto a tissue;
a microscope having a viewing port; and
an optical pachymeter emitting a measurement light beam directed along an optical path toward the tissue, three wavelengths of the light beam reflecting from the tissue, the optical pachymeter comprising an interferometer generating an interference signal for each of the three wavelengths of the measurement light beam reflected from the tissue, the pachymeter including a processor determining a separation distance between positions of at least two reflecting tissue surfaces along the optical path by combining the interference signals. - View Dependent Claims (28, 29)
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30. A method of measuring a separation distance between positions of at least two reflections along an optical path, the method comprising:
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reflecting at least three wavelengths of light at the positions by directing a measurement light beam along the optical path;
measuring an interference signal for each of the at least three wavelengths of the reflected light; and
determining the separation distance between the positions of the at least two reflections along the optical path by combining the interference signals.
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Specification