Brain Edema Detection via Near-Infrared Spectroscopy
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Solution Overview
Problem
Current methods for monitoring intracranial pressure (ICP) in brain edema are either invasive, which can be undesirable, or non-invasive methods like ultrasound emissions that may be inaccurate and require prolonged exposure, posing challenges in effectively diagnosing and managing brain edema.
Innovation Solution
The use of diffusely reflected near-infrared spectroscopy (NIRS) to estimate water content and measure changes in microcirculation around brain tissue, allowing for both invasive and non-invasive detection of brain edema through a hydration monitoring system that correlates light absorbance with tissue water content, using specific wavelength pairs to minimize interference from scattering and temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If invasive devices (hollow screw and bolt devices, intraventricular catheters) are used to monitor ICP, then measurement precision is improved, but device complexity and patient harm increase
Solution Approach 1:
The patent replaces mechanical invasive pressure measurement devices with an optical system that uses near-infrared light to measure brain tissue water content and calculate ICP. The optical sensor system substitutes mechanical insertion devices, eliminating the need for hollow screws and catheters while providing continuous non-invasive monitoring of brain edema and intracranial pressure.
Solution Approach 2:
The patent uses an intermediary approach by measuring brain tissue water content as a proxy indicator for intracranial pressure. Instead of directly measuring pressure with invasive devices, the system uses optical measurements of tissue hydration (which correlates with edema and ICP) as an intermediate parameter to infer pressure conditions non-invasively.
2Object-affected harmful factors
If ultrasound emissions are used for non-invasive ICP monitoring, then patient harm is reduced, but measurement precision and exposure time increase
Solution Approach 1:
The patent changes the physical parameter used for measurement from ultrasound (acoustic waves) to near-infrared light (electromagnetic radiation). This parameter change enables non-invasive measurement while improving precision through spectrophotometric detection of tissue water content, which directly correlates with brain edema and intracranial pressure without requiring prolonged exposure times.
3Measurement precision
If traditional invasive ICP monitoring devices are used, then measurement precision is improved, but ease of operation deteriorates
Solution Approach 1:
The patent replaces complex mechanical insertion and positioning procedures with a simple optical contact method. The optical sensor can be placed externally on the scalp without requiring surgical insertion, eliminating the complexity of navigating to the subarachnoid space or ventricles while maintaining measurement precision through non-invasive optical detection of brain tissue properties.
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 approach enables accurate and non-invasive or minimally invasive monitoring of brain edema, providing reliable estimates of water content and microcirculation changes, thus facilitating early diagnosis and management of brain edema while reducing the risks associated with invasive procedures.
Implementation Method 1
The sensor is configured to detect diffusely reflected near infrared signals from the brain tissue
Implementation Method 2
correlates light absorbance with tissue water content, using specific wavelength pairs to minimize interference from scattering and temperature variations
Data Source
AI summary
Embodiments of the present invention relate to a system and method of detecting or monitoring brain edema in a patient. One embodiment of the present invention includes emitting a first light into the patient's brain tissue at a first wavelength, emitting a second light into the patient's brain tissue at a second wavelength, detecting the first and second lights after dispersion by the brain tissue at a detector, and determining an amount of water proximate the brain tissue based on the detected first and second lights.