Subthreshold Peripheral Nerve Stimulation for Paresthesia-Free Pain Relief

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Solution Overview

Problem

Current pain relief technologies often fail to effectively address chronic or sub-acute pain by sensitizing neural pathways, leading to unwanted side effects such as paresthesia and muscle contractions.

Innovation Solution

A system and method that deliver electrical current to peripheral nerves to alter action potential transmission without generating paresthesia or blocking neural signals, thereby providing subthreshold pain relief.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If electrical current is delivered to peripheral nerves to block neural transmission for pain relief, then pain perception is reduced, but paresthesia and muscle contractions occur as unwanted side effects

Engineering Contradiction:

Improvepain relief effectivenessVSAvoidparesthesia and muscle contractions

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies parameter changes by delivering electrical current at subthreshold intensities that modulate nerve excitability without reaching the threshold for action potential generation. This changes the parameter of current intensity from suprathreshold (causing paresthesia) to subthreshold (providing pain relief without side effects), resolving the contradiction between effective pain relief and avoidance of harmful sensations

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses partial action by delivering electrical current that partially modulates neural transmission rather than completely blocking it. The subthreshold current provides sufficient modulation to relieve pain while avoiding the excessive action (complete block) that causes paresthesia and muscle contractions

Inventive Principle:

Principle #16Partial or excessive action

2Reliability

If electrical current intensity is increased to ensure pain relief, then pain perception is reduced, but the current becomes perceptible and causes unwanted sensations

Engineering Contradiction:

Improvepain relief effectivenessVSAvoidperceptible sensations

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the current intensity parameter to subthreshold levels, below the perception threshold but sufficient to modulate nerve excitability and provide pain relief. This resolves the contradiction by finding the optimal parameter range that ensures effectiveness while avoiding perceptible sensations

Inventive Principle:

Principle #35Parameter changes

3Reliability

If conventional electrical stimulation is used to treat chronic pain, then pain relief is achieved, but neural pathways become sensitized leading to worsened pain perception

Engineering Contradiction:

Improvepain reliefVSAvoidneural pathway sensitization

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent inverts the conventional approach by using subthreshold current that modulates rather than activates neural pathways. Instead of stimulating nerves to relief (which causes sensitization), the inverted approach uses subthreshold modulation to relieve pain without activating the sensitization mechanism, resolving the contradiction between pain relief and neural stability

Inventive Principle:

Principle #13The other way round (Inversion)

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 solution effectively reduces pain perception by modulating action potential frequency, probability, and excitability without causing perceptible sensations or disrupting normal neural function.

Implementation Method 1

delivering electrical current that neither generates action potentials nor completely blocks neural transmission (in the peripheral nerve)

Methodology Applied

Scientific EffectElectrical Field: Electric Field

Implementation Method 2

altering transmission and/or production of action potentials in nerve tissue including a nerve cell body, dendrites, axons, axon hillocks, and/or other nerve fibers

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Data Source

PatentUS20250170398A1Devices and methods for delivery of electrical current for pain relief

Publication Date: 2025.05.29 SPR THERAPEUTICS

AI summary

Device/system that provides pain relief by delivering stimulation that neither generates action potentials nor completely blocks neural transmission (in the peripheral nerve). The present teachings provide relief by modulating release of neurotransmitters in peripheral nerves to cause neuromodulation at the level of the peripheral nerve (modulation of neural signals in the peripheral nerve). The present teachings provide relief by modulating release of neurotransmitters in peripheral nerves to cause neuromodulation at the level of the peripheral nerve (modulation of neural signals in the peripheral nerve) to alter the frequency of physiologically generated neural transmission.