Cerebral Probe Longitudinal Light Emission for Accurate Tissue Measurement
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Solution Overview
Problem
Existing invasive cerebral measurement devices face challenges such as signal disturbance, limited measurable range, and difficulty in localizing the tissue area due to light being redirected back to the probe without penetrating the tissue, leading to inaccurate measurements and tissue damage.
Innovation Solution
A measuring device with an elongate probe featuring a rigid distal section and separate optical or electrical conductors for emitting and receiving light, where the exit area is oriented longitudinally and the receiving area is positioned radially, allowing light to be deflected by more than 90 degrees to ensure interaction with the tissue before detection, reducing tissue stress and improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If light is redirected back to the probe without penetrating the tissue, then the measurement signal can be disturbed and falsified, but the device structure becomes simpler
Solution Approach 1:
The patent transitions from lateral light emission and detection to longitudinal light emission and detection. The light guide emits light in the longitudinal direction of the probe, and the receiving area is positioned at a distance from the exit area along the longitudinal axis, creating a directional measurement geometry that ensures light penetrates the tissue before being detected.
Solution Approach 2:
The patent introduces a diffusing element at the exit area of the probe that scatters the emitted light in multiple directions, ensuring that light penetrates the tissue at various angles and depths before being reflected back to the receiving area. This intermediary element prevents direct light paths that would cause signal falsification.
2Measurement precision
If the measurable range within the cerebral tissue is limited due to co-located transmission and reception openings, then the device structure is simpler, but the measurement range is severely limited
Solution Approach 1:
The patent separates the transmission and reception functions along the longitudinal dimension of the probe. The exit area where light is emitted is positioned at a distance from the receiving area, creating a spatial separation that enables light to penetrate deeper into the tissue and return to the detector, thereby expanding the measurable range.
3Measurement precision
If light exits laterally in the radial direction, then the device structure is simpler, but a significant part of the light can reach the receiving optode directly on the side of the probe without penetrating through the tissue to be measured
Solution Approach 1:
The patent inverts the conventional lateral light emission approach by emitting light in the longitudinal direction of the probe. This reversal ensures that light must penetrate the tissue in the direction of probe insertion before being reflected back, preventing direct light paths that would bypass the tissue and falsify measurements.
4Measurement precision
If the transmission and reception openings are located together, then the device structure is simpler, but the measurements can be falsified due to the transmission and reception openings being located together
Solution Approach 1:
The patent segments the optical measurement function into separate transmission and reception areas along the longitudinal axis of the probe. The exit area for light emission is positioned at a distance from the receiving area, creating distinct functional zones that prevent measurement falsification while maintaining a relatively simple overall device structure.
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 design enables reliable, accurate, and minimally invasive measurement of cerebral parameters with reduced tissue impact, allowing for precise localization and enhanced sensitivity by ensuring light interacts with the tissue before being recorded, thus improving measurement fidelity and reducing tissue damage.
Implementation Method 1
At least one optical or electrical conductor (2, 3) is provided for the transmission of light beams, which runs essentially along the longitudinal axis (4) of the probe (1) inside the probe (1) and is guided through the flexible line to the probe (1)
Implementation Method 2
the light beams reflected, scattered and/or absorbed by the body tissue
Implementation Method 3
the light beams reflected, scattered and/or absorbed by the body tissue
Data Source
Figure 1~3
AI summary
The invention relates to a measuring device and to a method for measuring parameters of a body tissue using an elongate probe (1) for insertion into the body tissue, comprising at least one optical waveguide (2) for transmitting light beams that runs along the longitudinal axis of the probe within the probe, an exit region (5) from which light beams emitted from the optical waveguide exit into the body tissue, and at least one receiving region (6) through which light beams reflected and/or scattered in the body tissue enter the probe as input light beams on a photodetector or in an optical waveguide (2; 3). The exit region (5) is provided at the distal end of the probe (1) and is oriented at least partially in the longitudinal direction of the probe (1). At least some of the emitted light beams exit the probe in the longitudinal direction of the probe. The at least one receiving region (6) is located at a distance from the distal end of the probe on a lateral circumferential region of the probe. The input light beams entering a receiving region (6) are subject to a deflection of more than 90° relative to the light beams emitted from the exit region (5).