Alternating Electric Fields for Reversible Blood-Brain Barrier Permeability
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Solution Overview
Problem
The blood-brain barrier (BBB) restricts the diffusion of large or hydrophilic drug molecules, preventing their delivery to the brain for treatment of diseases.
Innovation Solution
Applying alternating electric fields at specific frequencies and durations causes the delocalization of tight junction proteins, temporarily increasing the permeability of the BBB to allow molecules to cross.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the BBB operates normally to prevent harmful substances from entering the brain, then protection against bacteria, viruses, and large hydrophilic molecules is improved, but delivery of large or hydrophilic drug molecules to the brain is blocked
Solution Approach 1:
The patent applies alternating electric fields to dynamically modulate the BBB permeability. The electric field parameters (frequency, amplitude, duration) are adjusted to temporarily increase permeability during drug delivery windows, then reduced to restore barrier function, making the BBB's permeability property dynamic rather than static
Solution Approach 2:
The patent employs periodic application of alternating electric fields with specific frequencies (e.g., 100 kHz, 200 kHz) to repeatedly open and close the BBB. This periodic action allows multiple drug delivery opportunities while maintaining overall barrier protection, creating cycles of increased and normal permeability
2Adaptability or versatility
If alternating electric fields are applied to increase BBB permeability for drug delivery, then delivery of hydrophilic and large molecules is improved, but the barrier function against harmful substances may be compromised
Solution Approach 1:
The patent applies alternating electric fields before drug administration to pre-open the BBB, allowing subsequent drug delivery during the permeable state. This preliminary action ensures the barrier is optimized for drug passage before the therapeutic agent is introduced
Solution Approach 2:
The patent monitors BBB permeability status and adjusts electric field parameters accordingly. By measuring permeability changes and feedback-controlling the field application, the system maintains optimal drug delivery conditions while preventing excessive opening that would compromise protective barrier function
3Productivity
If tight junction proteins are delocalized to increase BBB permeability, then transport of substances across the barrier is improved, but structural integrity of the barrier may be reduced
Solution Approach 1:
The patent changes physical parameters (electric field frequency, amplitude, pulse duration) to temporarily alter tight junction protein conformation and delocalization. By precisely controlling these parameters, the system achieves sufficient protein delocalization for drug passage while avoiding complete disruption of the barrier structure
Solution Approach 2:
The patent applies electric fields at intensities that cause partial delocalization of tight junction proteins rather than complete disruption. This partial action is sufficient to increase permeability for drug delivery while maintaining enough structural integrity to preserve barrier function
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 BBB permeability is reversibly increased, enabling the delivery of substances like chemotherapeutic agents, antibodies, and diagnostic agents across the barrier.
Implementation Method 1
Applying alternating electric fields at specific frequencies and durations causes the delocalization of tight junction proteins, temporarily increasing the permeability of the BBB
Data Source
Figure 1
Figure 2A~2B
Figure 3A~3B
AI summary
Certain substances (e.g., large molecules) that ordinarily cannot traverse the blood brain barrier can be introduced into the brain by applying an alternating electric field to the brain for a period of time, wherein the frequency of the alternating electric field is selected so that application of the alternating electric field increases permeability of the blood brain barrier. In some embodiments, the frequency of the alternating electric field is less than 190 kHz (e.g., 100 kHz). Once the permeability of the blood brain barrier has been increased, the substance is able to cross the blood brain barrier.