Optical Bioinstrumentation Probe Fixing for Movement Noise Reduction
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Solution Overview
Problem
Optical bioinstrumentation devices face challenges in obtaining accurate measurements due to subject movement, which causes displacement of the measurement probe and introduces noise in the data, as it is difficult to immobilize a living subject during measurement.
Innovation Solution
The device employs a configuration with multiple optical fibers for irradiation and detection, along with a fixing member and additional means for securing the optical fibers at multiple positions on the subject, such as using adhesive tape, loop fastener tapes, or elastic fixtures, to stabilize the probe and reduce movement-induced noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical measurement probe is used to measure information inside a living body, then the measurement can be performed without hazardous damage, but the probe may be dislocated or separated due to subject movement, preventing accurate measurement
Solution Approach 1:
The probe is divided into multiple independent optical fibers (irradiation fibers and detection fibers) that are arranged in a lattice pattern. Each fiber can be independently positioned and fixed, allowing the measurement function to be maintained even if some fibers experience minor displacement due to subject movement.
Solution Approach 2:
Multiple optical fibers are bundled together in a lattice arrangement and fixed as a unified structure on the subject. This combined structure distributes the measurement function across multiple contact points, making the overall probe more stable and resistant to displacement compared to a single fiber or simple contact point.
2Measurement precision
If multiple optical fibers are used for measurement, then the measurement precision can be improved, but the device complexity increases due to the need for fixing members and multiple fibers
Solution Approach 1:
The lattice-arranged optical fibers serve multiple functions simultaneously: they provide redundant measurement paths, distribute mechanical stress from subject movement, and create a stable contact pattern on the curved surface of the head. This multi-functionality justifies the increased number of fibers by providing benefits beyond simple measurement precision.
Solution Approach 2:
The optical fibers are specifically arranged in a lattice pattern at locations optimized for measuring hemodynamic changes in the head. This localized arrangement concentrates the measurement capability where it is most needed while maintaining a relatively simple overall probe structure that can be easily applied to the subject.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration provides more accurate and stable measurement data with reduced noise, even when the subject moves, by effectively anchoring the optical fibers and maintaining probe contact during measurement.
Implementation Method 1
the apparatus using light is extremely effective means. The primary reason for the effectiveness of optical measurement is that the oxygen metabolism inside the living body depends on the concentrations of specific chromophores (hemoglobin, cytochrome aa3, myoglobin and others), and that the concentrations of these chromophores can be calculated from the light absorption amount
Implementation Method 2
detects the light which transmits or reflects from the living body, leads the light thus detected by the optic fiber to the photo diode and obtains the information about the living body from the detected amount of light
Implementation Method 3
the concentrations of these chromophores can be calculated from the light absorption amount
Data Source
AI summary
There is provided an optical bioinstrumentation device, with which measurement data reflect more correctly the information inside the living body with less noise even the subject moves when the information inside the living body is measured by using the light.In the present invention, the means for fixing the part other than the tips of the optical fibers for irradiation and detection on the fixing member which is to fix the tips of the optical fiber for irradiation and detection on the subject, or, the means for fixing the optical fiber is fixed on the fixing member which is to fix the end of the optical fiber on the subject, or the means for fixing the optical fiber at two or more positions on the subject.