Non-invasive medical sensor
First Claim
1. Apparatus for non-invasive monitoring of a substance in living tissue, which apparatus comprises:
- a) emitter means capable of emitting electromagnetic radiation, said emitter means being arrangeable in use in contact with the skin, tissue or an organ of a patient;
b) first radiation detection means arrangeable in use in contact with the skin, tissue or organ of said patient, said first radiation detection means being spaced from said emitter means to detect radiation which has been scattered and attenuated by the skin, tissue or organ of said patient;
c) means for producing a first electrical output signal dependent on the intensity of the radiation detected by said first radiation detection means;
d) second radiation detection means arrangeable in use in contact with the skin, tissue or organ of said patient, said second radiation detection means being spaced farther away from said emitter means than said first radiation detection means and be in a ranged to detect radiation which has been scattered and attenuated by the skin, tissue or organ of said patient;
e) means for producing a second electrical output signal dependent on the intensity of the radiation detected by said second radiation detection means; and
f) processor means providing a quantitative measure of said substance in said living tissue, said quantitative measure being dependent on the ratio of said first and second output signals.
3 Assignments
0 Petitions
Accused Products
Abstract
Apparatus 1 for non-invasive quantitative measurement of a substance in living tissue, the apparatus comprising an electromagnetic radiation emitter 5 to contact a patient'"'"'s skin, tissue or organ 6, first radiation detector 3 spaced from the radiation emitter 5, and which is also to contact the skin, tissue or organ 6, and second radiation detector 2 which is spaced from the radiation emitter 5 by a distance greater than the spacing between the first radiation detector 3 and the radiation emitter 5, and is to contact the skin, tissue or organ 6. Electrical output signals are produced dependent on the intensity of the radiation detected by the radiation detectors and processed to obtain a value for the concentration of the substance in living tissue.
139 Citations
15 Claims
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1. Apparatus for non-invasive monitoring of a substance in living tissue, which apparatus comprises:
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a) emitter means capable of emitting electromagnetic radiation, said emitter means being arrangeable in use in contact with the skin, tissue or an organ of a patient; b) first radiation detection means arrangeable in use in contact with the skin, tissue or organ of said patient, said first radiation detection means being spaced from said emitter means to detect radiation which has been scattered and attenuated by the skin, tissue or organ of said patient; c) means for producing a first electrical output signal dependent on the intensity of the radiation detected by said first radiation detection means; d) second radiation detection means arrangeable in use in contact with the skin, tissue or organ of said patient, said second radiation detection means being spaced farther away from said emitter means than said first radiation detection means and be in a ranged to detect radiation which has been scattered and attenuated by the skin, tissue or organ of said patient; e) means for producing a second electrical output signal dependent on the intensity of the radiation detected by said second radiation detection means; and f) processor means providing a quantitative measure of said substance in said living tissue, said quantitative measure being dependent on the ratio of said first and second output signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. Apparatus for non-invasive monitoring of a substance in living tissue, which apparatus comprises:
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a) emitter means capable of emitting electromagnetic radiation, said emitter means being arrangeable in use in contact with the skin, tissue or organ of a patient; b) first radiation detection means arrangeable in use in contact with the skin, tissue or organ of said patient, said first radiation detection means being spaced by a first distance from said emitter means to detect radiation which has been scattered and passed through the patient; c) means for producing a first electrical output signal dependent on the intensity of the radiation detected by said first radiation detection means; d) second radiation detection means arrangeable in use in contact with the skin, tissue or organ of said patient, said second radiation detection means being spaced by a second distance from said emitter means and by a third distance from said first radiation detection means to detect radiation which has been scattered and passed through the patient, wherein said first distance is at least as great as said third distance; e) means for producing a second electrical output signal dependent on the intensity of the radiation detected by said second radiation detection means; and f) processor means arranged to provide a quantitative measure of said substance in said living tissue, said quantitative measure being dependent on said first and second output signals. - View Dependent Claims (14)
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15. Apparatus for non-invasive monitoring of a substance in living tissue comprising:
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a) emitter means capable of emitting electromagnetic radiation, said emitter means being arrangeable in use in contact with the skin, tissue or organ of a patient; b) first annular radiation detector means extending around and spaced from said emitter means, and arrangeable in use in contact with the skin, tissue or organ of said patient; c) means for producing a first electrical output signal dependent on the intensity of the radiation detected by said first radiation detector means; d) second annular radiation detector means arranged concentrically with said first annular radiation detector means, said second annular radiation detector means extending around said emitter means and being spaced from said emitter means by a distance greater than said spacing between said first radiation detector means and said emitter means, said second radiation detector means being arrangeable in use in contact with the skin, tissue or organ of said patient; e) means for producing a second electrical output signal dependent on the intensity of the radiation detected by said second radiation detector means; and f) signal processor means providing a quantitative measurement of said substance in said living tissue dependent on the ratio of said first and second output signals.
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Specification