Current Bias Control in Implantable Electrodes for Pain Blocking

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Solution Overview

Problem

Current spinal cord stimulation systems for pain management, based on the gate control theory, do not completely inhibit pain transmission and can cause undesirable side effects like paresthesia, and there is a need for more effective methods to block or attenuate pain signals without these drawbacks.

Innovation Solution

Systems and methods involving implantable electrodes with high charge capacity materials and a bias current generator that deliver set currents with specific polarities, using direct current (DC) to modulate neural tissue, avoiding capacitors and actively balancing currents to prevent irreversible reactions and maintain tissue safety.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If spinal cord stimulation systems use gate control theory to indirectly reduce pain signals, then pain management is provided, but pain transmission inhibition is not complete and side effects such as paresthesia occur

Engineering Contradiction:

Improvepain transmission inhibition effectivenessVSAvoidside effects such as paresthesia

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Instead of using conventional AC stimulation to indirectly mask pain signals through gate control theory, this patent applies DC stimulation to directly block pain signal transmission by depolarizing or hyperpolarizing neurons. This inversion of the stimulation approach (from AC to DC, from indirect to direct mechanism) achieves more complete pain inhibition without causing paresthesia side effects

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The patent changes the electrical stimulation parameters from alternating current (AC) to direct current (DC), and adjusts voltage levels to depolarize or hyperpolarize neurons. This parameter change transforms the mechanism from indirect gate control to direct neural blockade, improving pain inhibition effectiveness while eliminating paresthesia caused by conventional AC stimulation

Inventive Principle:

Principle #35Parameter changes

2Reliability

If DC current is used to directly block pain signals by depolarizing or hyperpolarizing neurons, then complete pain transmission inhibition is achieved, but electrode polarization and tissue damage may occur

Engineering Contradiction:

Improvepain signal blockade effectivenessVSAvoidelectrode polarization and tissue damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent employs periodic reversal of DC current polarity to prevent electrode polarization. By alternating between cathodic and anodic phases, the system maintains effective neural blockade while preventing charge accumulation at the electrode-tissue interface that would otherwise cause polarization and potential tissue damage

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The patent uses high-charge capacity materials and optimized current delivery to maintain continuous neural blockade without interruption. This ensures sustained pain signal inhibition while the periodic polarity reversal continuously prevents electrode polarization, achieving both effective pain blockade and tissue safety over extended periods

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

This approach effectively blocks or attenuates pain signals, reduces neural activity, and avoids side effects by using DC to depolarize or hyperpolarize neurons, providing long-lasting therapeutic benefits and minimizing tissue damage.

Implementation Method 1

using DC to depolarize or hyperpolarize neurons

Methodology Applied

Scientific EffectDepolarization:

Implementation Method 2

using DC to depolarize orhyperpolarize neurons

Methodology Applied

Scientific EffectHyperpolarization:

Implementation Method 3

the at least one indifferent electrode absorbs a bias current

Methodology Applied

Scientific EffectElectrical conduction: Conduction (electrical)

Data Source

PatentUS20250281736A1Current bias as a control mechanism for electrode operation

Publication Date: 2025.09.11 PRESIDIO MEDICAL INC

AI summary

Disclosed herein are systems and methods for electrically modulating tissue. Systems can include a current generator; at least one implantable working electrode, the at least one implantable working electrode configured to be in electrical communication with the current generator; at least one indifferent electrode; and a controller configured to signal the current generator to: generate a set of currents with a set of initial polarities to be delivered to the working electrodes; and wherein the at least one indifferent electrode absorbs a bias current which is equal in magnitude and opposite in polarity to a summation of the set of currents.