Alternating Electric Fields for Reversible Blood-Brain Barrier Opening

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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 therapeutic purposes.

Innovation Solution

Applying alternating electric fields at specific frequencies and durations to temporarily increase BBB permeability, allowing substances to cross, followed by recovery periods to reopen the barrier for subsequent administrations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the BBB operates normally to prevent harmful substances from entering the brain, then protection of the brain is improved, but delivery of large or hydrophilic drug molecules to the brain is blocked

Engineering Contradiction:

Improveprotection from harmful substancesVSAvoiddelivery of drug molecules

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The BBB permeability is dynamically modulated by applying alternating electric fields to open the barrier temporarily for drug delivery, then allowing recovery to restore protection. This dynamic switching between open and closed states resolves the contradiction between protection and delivery versatility.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The alternating electric field is applied periodically with specific frequency (50-200 kHz) and duration (24-72 hours) to temporarily increase BBB permeability, followed by recovery periods. This periodic opening and closing enables repeated drug deliveries while maintaining overall brain protection.

Inventive Principle:

Principle #19Periodic action

2Adaptability or versatility

If alternating electric field is applied to increase BBB permeability for drug delivery, then delivery capability is improved, but BBB protection function deteriorates temporarily

Engineering Contradiction:

Improvedelivery of substancesVSAvoidprotection function

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The alternating electric field application follows a periodic pattern with treatment phases (24-72 hours) followed by recovery phases, allowing the BBB to temporarily open for drug delivery then restore its protective function, thus managing the trade-off between delivery and protection.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The BBB temporarily discards its protective barrier function during electric field application to allow drug penetration, then recovers and restores the barrier after the treatment period, enabling repeated cycles of delivery while maintaining overall protection.

Inventive Principle:

Principle #34Discarding and recovering

3Adaptability or versatility

If multiple substances are administered through repeated BBB opening, then treatment versatility is improved, but treatment time and complexity increase

Engineering Contradiction:

Improveadministration of multiple substancesVSAvoidtreatment duration

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The alternating electric field is applied in advance (24-72 hours before) to pre-open the BBB, allowing multiple substances to be administered during the opened state without requiring repeated field applications, thus reducing overall treatment time and complexity.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Multiple drug administrations are merged into a single treatment cycle by maintaining the BBB in an opened state through continuous or repeated electric field application, allowing sequential delivery of multiple substances without closing and reopening the barrier between each administration.

Inventive Principle:

Principle #5Merging (Combining)

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

Enables the delivery of molecules up to 69 kDa across the BBB, facilitating treatments for brain diseases and diagnostics by enhancing drug uptake and maintaining safety for the subject.

Implementation Method 1

TJs are formed by an intricate complex of transmembrane proteins (claudin and occludin) with cytoplasmic accessory proteins (ZO-1 and -2, cingulin, AF-6, and 7H6). By linking to the actin cytoskeleton, these proteins form a strong cell-cell connection.

Methodology Applied

Scientific EffectElectrophoresis: Electrophoresis

Implementation Method 2

applying an alternating electric field to the subject's brain for a first period of time increases permeability of the blood brain barrier in the subject's brain

Methodology Applied

Scientific EffectElectric field effect on membrane permeability: Electric Field

Data Source

PatentUS20260041896A1Using Alternating Electric Fields to Increase Permeability of the Blood Brain Barrier

Publication Date: 2026.02.12 NOVOCURE GMBH

AI summary

Many drugs and other molecules cannot ordinarily traverse the blood brain barrier (BBB). However, when alternating electric fields at certain optimum frequencies (e.g., 100 kHz) are applied to the brain, the BBB becomes permeable to those molecules. When the alternating electric fields are discontinued, the BBB eventually recovers to its original impermeable state. Subsequently, re-application of alternating electric fields at the optimum frequencies will re-open the BBB. Ordinarily, many frequencies (e.g., 200 kHz) of alternating electric fields are either ineffective or less effective at inducing permeability than the optimum frequencies. But once the BBB has been opened by applying alternating electric fields at the optimum frequencies, alternating electric fields at non-optimum frequencies can maintain the permeability of a previously-opened BBB.