Microbubble Size Matching for Targeted BBB Disruption
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current ultrasound procedures for disrupting the blood-brain barrier (BBB) using microbubbles are inefficient due to mismatched microbubble sizes with vessel diameters, leading to incomplete disruption and potential tissue damage.
Innovation Solution
Determine the distribution of vessel diameters in the target region and provide microbubbles with a size distribution matching the vasculature, using ultrasound imaging and other modalities, to enhance BBB disruption efficiency and minimize tissue damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If microbubbles are used to disrupt the BBB, then BBB disruption can be achieved, but incomplete disruption occurs due to size mismatch with vessels
Solution Approach 1:
The patent changes the size parameter of microbubbles to match the diameter distribution of brain vessels. By characterizing vessel diameters and selecting microbubbles with corresponding size ranges, the invention ensures microbubbles can enter target vessels effectively, resolving the size mismatch problem that causes incomplete BBB disruption.
Solution Approach 2:
The patent applies different microbubble size distributions to different vessel size ranges. By matching microbubble sizes to specific vessel diameter categories (small, medium, large vessels), the invention creates locally optimized BBB disruption in different vascular regions, improving overall disruption effectiveness.
2Reliability
If severe oscillations are applied to disrupt BBB, then disruption effectiveness improves, but hemorrhages occur as harmful effect
Solution Approach 1:
The patent optimizes the oscillation parameter by matching microbubble size to vessel diameter. This size matching allows effective BBB disruption at lower oscillation amplitudes, preventing the harmful effects of severe oscillations while maintaining disruption effectiveness.
Solution Approach 2:
The patent uses acoustic feedback to monitor microbubble oscillations in real-time. By measuring the acoustic response from microbubbles and comparing it against safety thresholds, the system adjusts oscillation parameters to maintain effective but safe disruption levels, preventing hemorrhages.
3Reliability
If microbubbles are used for BBB disruption, then targeted disruption is achieved, but microbubbles cannot enter small vessels smaller than their diameter
Solution Approach 1:
The patent changes the size parameter of microbubbles to match the diameter distribution of brain vessels. By characterizing vessel diameters and selecting microbubbles with corresponding size ranges, the invention ensures microbubbles can enter target vessels effectively, resolving the size mismatch problem that causes incomplete BBB disruption.
Solution Approach 2:
The patent creates a universal microbubble population with a distributed size range that can interact with multiple vessel size categories. This multi-sized approach allows a single microbubble formulation to target small, medium, and large vessels, achieving versatile coverage across the entire vascular tree.
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
The method ensures effective BBB disruption by aligning microbubble sizes with vessel diameters, improving treatment efficacy and reducing harm to healthy tissue.
Implementation Method 1
The mechanical oscillations of these microbubbles caused by the ultrasound disrupt the BBB
Implementation Method 2
therapeutic application of ultrasound
Data Source
Figure 1
Figure 2
Figure 3A
AI summary
Systems and methods are provided for initializing an ultrasound procedure for a target region. The method includes determining a distribution of vessel diameters of vasculature in a target region. The method also includes providing, at the target region, microbubbles having a size distribution related to the distribution of vessel diameters.