Non-invasive optical measuring sensor and measuring method
First Claim
1. A non-invasive optical sensor for measuring the content or composition of one or more chemical components within a tissue of a body portion, said sensor being suitable for being placed on a selected portion of the patient'"'"'s body, said sensor comprising:
- a radiation source for emitting radiation having at least two wavelengths, the radiation being applied to an external surface of the body portion for transmission into the body portion when the sensor is placed on the body portion;
a detector for receiving radiation from an external surface of the body portion and for providing a signal evincing a property of the received radiation when the sensor is placed on the body portion; and
at least one radiation transfer section, said radiation transfer section having a first end aperture facing an external surface of the body portion when the sensor is placed on the body portion, said radiation transfer section having a second end aperture coupled to one of said radiation source and detector, the area of said first end aperture being greater than the area of said second end aperture, said radiation transfer section having a diffusely reflective surface for receiving radiation entering said radiation transfer section from one of said end apertures and transferring same to the other of said end apertures, said diffusely reflective surface comprising a surface formed to have diffusely reflective properties approaching those of a Lambertian surface so that generally uniform scattering of the received radiation by the diffusely reflective surface predominates.
1 Assignment
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Accused Products
Abstract
An optical sensor for non-invasively measuring the content or composition of one or more chemical components within especially a living tissue of a body portion. Radiation sources (38), emit measuring radiation with at least two wavelengths to a portion (6) of the body of a patient. A detector (37) receives the measuring radiation having passed through said body portion of a patient and converts same to electric form. At least one radiation transfer section is located between either the radiation sources or respectively the detectors and the external surface (50) of the body portion of a patient. The radiation transfer section includes measuring-radiation transmitting ends. An outer end (16, 26) facing the external body surface (50) has a surface area which is generally larger than the surface area of an inner end (13a; 19a) facing any given radiation sources or respectively detectors. A measuring-radiation diffusely reflecting surface (14, 17) is positioned between the ends. The sensor may comprise a pulse oximeter sensor.
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Citations
41 Claims
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1. A non-invasive optical sensor for measuring the content or composition of one or more chemical components within a tissue of a body portion, said sensor being suitable for being placed on a selected portion of the patient'"'"'s body, said sensor comprising:
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a radiation source for emitting radiation having at least two wavelengths, the radiation being applied to an external surface of the body portion for transmission into the body portion when the sensor is placed on the body portion; a detector for receiving radiation from an external surface of the body portion and for providing a signal evincing a property of the received radiation when the sensor is placed on the body portion; and at least one radiation transfer section, said radiation transfer section having a first end aperture facing an external surface of the body portion when the sensor is placed on the body portion, said radiation transfer section having a second end aperture coupled to one of said radiation source and detector, the area of said first end aperture being greater than the area of said second end aperture, said radiation transfer section having a diffusely reflective surface for receiving radiation entering said radiation transfer section from one of said end apertures and transferring same to the other of said end apertures, said diffusely reflective surface comprising a surface formed to have diffusely reflective properties approaching those of a Lambertian surface so that generally uniform scattering of the received radiation by the diffusely reflective surface predominates. - View Dependent Claims (4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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2. A non-invasive optical sensor for measuring the content or composition of one or more chemical components within a living tissue of a body portion, said sensor utilizing a pulsatory phenomenon of said body portion and being suitable for being placed on a selected portion of the patient'"'"'s body, said sensor comprising:
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a radiation source for emitting radiation having at least two wavelengths, the radiation being applied to an external surface of the body portion for transmission into the body portion when the sensor is placed on the body portion; a detector for receiving radiation from an external surface of the body portion and for providing a signal evincing a property of the received radiation when the sensor is placed on the body portion; and at least one radiation transfer section, said radiation transfer section having a first end aperture facing an external surface of the body portion when the sensor is placed on the body portion, said radiation transfer section having a second end aperture coupled to one of said radiation source and detector, the area of said first end aperture being greater than the area of said second end aperture, said radiation transfer section having a diffusely reflective surface for receiving radiation entering said radiation transfer section from one of said end apertures and transferring same to the other of said end apertures, said diffusely reflective surface comprising a surface formed to have diffusely reflective properties approaching those of a Lambertian surface so that generally uniform scattering of the received radiation by the diffusely reflective surface predominates.
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3. A pulse oximeter sensor for non-invasively measuring the degree of oxygen saturation in a patient'"'"'s blood, said sensor being suitable for being placed on a selected portion of the patient'"'"'s body, said sensor comprising:
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a radiation source for emitting radiation having at least two wavelengths, the radiation being applied to an external surface of the body portion for transmission into the body portion when the sensor is placed on the body portion; a detector for receiving radiation from an external surface of the body portion and for providing a signal evincing a property of the received radiation when the sensor is placed on the body portion; and at least one radiation transfer section, said radiation transfer section having a first end aperture facing an external surface of the body portion when the sensor is placed on the body portion, said radiation transfer section having a second end aperture coupled to one of said radiation source and detector, the area of said first end aperture being greater than the area of said second end aperture, said radiation transfer section having a diffusely reflective surface for receiving radiation entering said radiation transfer section from one of said end apertures and transferring same to the other of said end apertures, said diffusely reflective surface comprising a surface formed to have diffusely reflective properties approaching those of a Lambertian surface so that generally uniform scattering of the received radiation by the diffusely reflective surface predominates.
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36. A method for non-invasively measuring the content or composition of one or more chemical components within a tissue or body portion, said method comprising the steps of:
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emitting radiation having at least two wavelengths suitable for carrying out the measurement; applying the radiation to a surface of a selected portion of the patient'"'"'s body; detecting radiation from a surface of the selected portion of the patient'"'"'s body, the radiation evincing a property of the received radiation indicative of the chemical component; providing a signal indicative of the chemical component content or composition; and subjecting the radiation at a point outside the selected portion of the patient'"'"'s body to diffusive reflection by applying the radiation to a surface having diffuse reflection properties approaching those of a Lambertian surface so that generally uniform scattering of the radiation by the diffusively reflective surface predominates. - View Dependent Claims (39, 40, 41)
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37. A method for non-invasively measuring the content or composition of one or more components within a tissue of a body portion, said method utilizing a pulsatory phenomenon and comprising the steps of:
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emitting radiation having at least two wavelengths suitable for carrying out the measurement; applying the radiation to a surface of a selected portion of the patient'"'"'s body; detecting radiation from a surface of the selected portion of the patient'"'"'s body, the radiation evincing the pulsatile phenomenon and a property of the received radiation indicative of the chemical component; providing a signal indicative of the chemical component content or composition; and subjecting the radiation at a point outside the selected portion of the patient'"'"'s body to diffusive reflection by applying the radiation to a surface having diffuse reflection properties approaching those of a Lambertian surface so that generally uniform scattering of the radiation by the diffusively reflective surface predominates.
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38. A method for non-invasively measuring the degree of oxygen saturation in a patient'"'"'s blood, said method comprising the steps of:
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emitting radiation having at least two wavelengths suitable for carrying out the measurement; applying the radiation to a surface of a selected portion of the patient'"'"'s body; detecting radiation from a surface of the selected portion of the patient'"'"'s body, the radiation evincing a property of the received radiation indicative of the degree of oxygen saturation in the patient'"'"'s blood; providing a signal indicative of the degree of oxygen saturation in the patient'"'"'s blood; and subjecting the radiation at a point outside the selected portion of the patient'"'"'s body to diffusive reflection by applying the radiation to a surface having diffuse reflection properties approaching those of a Lambertian surface so that generally uniform scattering of the radiation by the diffusively reflective surface predominates.
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Specification