Pulsed Electric Field Control for Selective Stem Cell Migration

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Solution Overview

Problem

Current direct current electric stimulation methods for brain tissue are ineffective due to harmful heat generation, pH changes, and electrode products, making them unsafe and inefficient for guiding neural stem cell migration.

Innovation Solution

A system with programmable electrodes and a DC power source delivers an electric field with a controlled stimulation-to-nonstimulation ratio and form, minimizing harm to cells, allowing selective migration of stem cells and other desired cell types to damaged areas.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If direct current electric stimulation is applied to guide cell migration, then cell migration is achieved, but harmful effects (heat generation, pH changes, electrode products) occur

Engineering Contradiction:

Improvecell migration speedVSAvoidheat generation and pH changes in tissue

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

The patent applies periodic or pulsed electric field stimulation instead of continuous direct current stimulation. This allows the tissue to recover between pulses, reducing cumulative heat generation and pH changes while still achieving effective cell migration guidance through the periodic stimulation cycles.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent changes the electrical stimulation parameters from continuous direct current to pulsed or periodic electric fields with controlled amplitude, duration, and frequency. This parameter modification reduces the harmful thermal and chemical effects while maintaining the electrotaxis guidance effect on migrating cells.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If high current is applied to stimulate cell migration, then migration guidance is improved, but tissue damage increases due to high conductivity

Engineering Contradiction:

Improvemigration guidance effectivenessVSAvoidtissue damage from large current flow

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent modifies the electrical stimulation parameters by using pulsed or periodic electric fields with optimized amplitude and duration. This allows achieving effective migration guidance at lower current densities compared to continuous stimulation, reducing tissue damage while maintaining reliability.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

By applying periodic stimulation with appropriate pulse frequency and duty cycle, the system achieves cumulative migration guidance effects without requiring continuously high current levels, thereby reducing tissue damage from excessive current flow.

Inventive Principle:

Principle #19Periodic action

3Reliability

If continuous electric stimulation is applied, then cell migration guidance is maintained, but energy consumption increases

Engineering Contradiction:

Improvecontinuous migration guidanceVSAvoidenergy consumption of stimulation device

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent employs periodic or pulsed electric field stimulation with controlled duty cycles, delivering stimulation only during necessary intervals. This maintains effective migration guidance during active phases while reducing energy consumption during inter-pulse intervals compared to continuous stimulation.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

By optimizing the pulse frequency and duty cycle, the system maintains continuous guidance effectiveness through properly spaced pulses while minimizing energy consumption. The periodic action ensures migration guidance continuity without requiring constant energy input.

Inventive Principle:

Principle #20Continuity of useful action

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 system safely and effectively guides stem cells and their progenies to damaged brain tissue, preventing adverse effects on surrounding tissue and promoting regeneration while conserving power.

Implementation Method 1

deliver an electric field between the first delivery electrode and the second delivery electrode

Methodology Applied

Scientific EffectElectric field: Electric Field

Implementation Method 2

electric fields have been used to guide migration of many types of cells in the laboratory for over a century

Methodology Applied

Scientific EffectElectrotaxis:

Data Source

PatentUS9044611B2Systems and methods for selectively migrating cells using electric fields

Publication Date: 2015.06.02 RGT UNIV OF CALIFORNIA

AI summary

Systems and methods are provided for migrating cells implanted or endogenous in tissue. The system may include first and second delivery electrodes configured for insertion in tissue and a direct current (DC) power source operatively coupled to the first and second delivery electrodes. The system further may include a programmable controller operatively coupled to the DC power source, wherein the programmable controller is programmed to direct the DC power source to deliver an electric field between the first delivery electrode and the second delivery electrode at a stimulation to nonstimulation ratio sufficient to cause the cells to migrate within tissue selectively.