Non-invasive measurement of skin bilirubin level
First Claim
1. Process for the measurement of the level of a tissue constituent, characterized in that is/are measured a first light reflection with a first given wavelength that is representative of the measurement to be performed and at least a second measurement of the light reflection for another second predetermined wavelength that will serve as a reference unit value Rf, by calculating the coefficient k between the reflection measured on the tissue for this second wavelength and the reflection measured on a standard for this same second wavelength, and in that the level of the constituent to be evaluated is deduced from the measurement of the reflection of the first wavelength according to a table of predetermined values known for this same first wavelength, after correction by the factor k previously measured of said reflection measurement, so as to obtain the value to be compared to the table reference values, said unit value and said second wavelength determining a point through which will go all the LIR curves after standardization.
2 Assignments
0 Petitions
Accused Products
Abstract
The invention concerns a method and a device for non-invasive measurement of a tissue and in particular of the skin bilirubin level. The inventive device is characterized in that it comprises: a reading head (1) capable of sending several flashes of various specific wavelengths towards the tissue (2) to be examined and of receiving and measuring in return the reflected light; a calculator, such as a microprocessor, capable of calculating for each wavelength the amount of reflected light and bring it to a value calculated proportionally to a reference value identical for a predetermined wavelength; and a comparator for comparing the calculated value to a table of reference values.
-
Citations
12 Claims
- 1. Process for the measurement of the level of a tissue constituent, characterized in that is/are measured a first light reflection with a first given wavelength that is representative of the measurement to be performed and at least a second measurement of the light reflection for another second predetermined wavelength that will serve as a reference unit value Rf, by calculating the coefficient k between the reflection measured on the tissue for this second wavelength and the reflection measured on a standard for this same second wavelength, and in that the level of the constituent to be evaluated is deduced from the measurement of the reflection of the first wavelength according to a table of predetermined values known for this same first wavelength, after correction by the factor k previously measured of said reflection measurement, so as to obtain the value to be compared to the table reference values, said unit value and said second wavelength determining a point through which will go all the LIR curves after standardization.
-
4. Device for the measurement of the level of a tissue constituent, characterized in that it comprises:
-
a reading head capable of sending successively several flashes of various predefined wavelengths toward the tissue to be examined as a conical beam having a cone angle between 30° and
50° and
of receiving and measuring in return the reflected light,a calculator, capable of calculating for each wavelength the amount of reflected light and of bringing it to a value calculated proportionally to a reference value identical for a predetermined wavelength, a comparator for comparing the calculated value to a table of reference values. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12)
-
Specification