Instrument for measuring concentrations of constituent parts of blood
First Claim
1. A blood-constituent concentration measuring instrument comprising:
- light source means for emitting measuring light to a portion of a living organism including a blood vessel, the measuring light having a plurality of wavelength components different from one another;
straight-advance light discrimination means for extracting a straight-advance light component or a scattered light component traveling along nearly a same optical path as said straight-advance light component from said measuring light which has passed through said living organism;
extinction-index change detection means for detecting an extinction index change in said straight-advance light component or said scattered light component extracted by said straight-advance light discrimination means; and
calculation means for calculating concentrations of the constituent parts of the blood, based on said extinction index change for each wavelength component of said measuring light.
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Accused Products
Abstract
A blood-constituent concentration measuring instrument capable of accurately measuring concentrations of the constituent parts of blood without invading tissue. Light source means (1) emits measuring light (S) to a living organism (2). The measuring light (S) consists of a plurality of wavelength components different from one another. Straight-advance light discrimination means (3) extracts a straight-advance light component or a scattered light component close thereto from light scattered at the living organism (2). Then, extinction-index change detection means (4) detects an extinction index change in straight-advance light component or the scattered light component extracted by the straight-advance light discrimination means (4). Calculation means (5) calculates concentrations of the constituent parts of the blood, based on the extinction index change for each wavelength component of the measuring light.
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Citations
11 Claims
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1. A blood-constituent concentration measuring instrument comprising:
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light source means for emitting measuring light to a portion of a living organism including a blood vessel, the measuring light having a plurality of wavelength components different from one another; straight-advance light discrimination means for extracting a straight-advance light component or a scattered light component traveling along nearly a same optical path as said straight-advance light component from said measuring light which has passed through said living organism; extinction-index change detection means for detecting an extinction index change in said straight-advance light component or said scattered light component extracted by said straight-advance light discrimination means; and calculation means for calculating concentrations of the constituent parts of the blood, based on said extinction index change for each wavelength component of said measuring light. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of measuring blood-constituent concentrations comprising steps of:
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irradiating measuring light onto a portion of a living organism including a blood vessel, the measuring light having a plurality of wavelength components different from one another; extracting a straight-advance light component or a scattered light component traveling along nearly a same optical path as said straight-advance light component from said measuring light which has passed through said living organism; detecting an extinction index change in said straight-advance light component or said scattered light component extracted in said extracting step; and calculating the concentrations of the constituent parts of the blood, based on said extinction index change for each wavelength component of said measuring light.
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Specification