Macromolecular Prodrugs With Light-Triggered Local Anesthetic Release

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Solution Overview

Problem

Existing local anesthetic release systems suffer from unwanted initial nerve blockage and basal drug release, lacking the ability to modulate drug release in response to changing patient needs.

Innovation Solution

A light-triggerable polymer-drug conjugate is developed, comprising a local anesthetic attached to a polymer carrier via a photocleavable linkage, allowing for adjustable drug release by illumination with light.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If liposomal systems are used for local anesthetic delivery, then the timing, intensity, and duration of local anesthesia can be controlled by irradiation, but untriggered rapid drug release occurs causing extended initial nerve block and drug depletion

Engineering Contradiction:

Improvecontrol of local anesthesia timing and intensityVSAvoiduntriggered rapid drug release

Core Design Contradiction:

Adaptability or versatilityVSLoss of substance

Solution Approach 1:

The patent extracts the harmful untriggered release function by introducing a photocleavable linkage that remains stable in the dark but cleaves upon light irradiation. This separates the storage function (stable polymer-drug conjugate) from the release function (light-triggered cleavage), eliminating spontaneous drug depletion while maintaining controllable release capability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The local anesthetic is pre-conjugated to the polymer carrier via the photocleavable linkage during manufacturing, creating a stable prodrug formulation. The harmful untriggered release is prevented by designing the linkage to be stable under storage conditions, while the beneficial triggered release is enabled by light irradiation that cleaves the linkage and releases the anesthetic at the desired time and location.

Inventive Principle:

Principle #10Preliminary action

2Duration of action of moving object

If sustained release systems are developed, then prolonged duration local anesthesia is achieved, but the drug release occurs in a relatively monotonic manner without real-time modulation capability

Engineering Contradiction:

Improveduration of local anesthesiaVSAvoidreal-time modulation of drug release

Core Design Contradiction:

Duration of action of moving objectVSAdaptability or versatility

Solution Approach 1:

The patent transforms the static sustained release system into a dynamic, controllable system by incorporating the photocleavable linkage. The drug release rate can be dynamically adjusted in real-time by controlling light irradiation parameters (intensity, duration, timing), allowing the system to adapt to changing patient needs rather than following a fixed monotonic release profile.

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The system enables feedback control by allowing patients or clinicians to monitor anesthesia needs and trigger release only when required. The light-triggered mechanism provides a direct feedback loop where the release event responds to real-time patient conditions, enabling on-demand adjustment of anesthetic duration and intensity.

Inventive Principle:

Principle #23Feedback

3Duration of action of moving object

If local anesthetics are administered for extended periods, then prolonged anesthesia duration is achieved, but tolerance and addiction problems increase

Engineering Contradiction:

Improveduration of local anesthesiaVSAvoidtolerance and addiction

Core Design Contradiction:

Duration of action of moving objectVSObject-affected harmful factors

Solution Approach 1:

Instead of continuous monotonous release, the patent implements periodic, on-demand release triggered by light irradiation. The polymer-drug conjugate remains stable during storage and only releases drug when activated by light, creating discrete, controlled release events rather than continuous exposure, thereby reducing tolerance development while maintaining effective anesthesia duration.

Inventive Principle:

Principle #19Periodic 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

Enables on-demand local anesthesia with adjustable intensity and duration, minimizing initial nerve block and drug wastage, and providing sustained release without untriggered drug release.

Implementation Method 1

a local anesthetic attached to a polymer carrier via a photocleavable linkage, allowing for adjustable drug release by illumination with light

Methodology Applied

Scientific EffectPhotocleavable linkage: Photodissociation

Data Source

PatentUS12427196B2Macromolecular prodrugs for light-emitting diodes and uses thereof

Publication Date: 2025.09.30 CHILDRENS MEDICAL CENT CORP

AI summary

Provided herein are compositions comprising macromolecular photocleavable prodrug compounds of Formula (I), and pharmaceutically acceptable salts, co-crystals, tautomers, stereoisomers, solvates, hydrates, polymorphs, and isotopically enriched derivatives thereof. Also provided are methods, uses, pharmaceutical compositions, and kits involving the inventive compounds or compositions for treating and/or preventing a disease and/or condition (e.g., inflammatory disease, infectious disease, pain) in a subject, optionally comprising illumination of the compound, composition, or pharmaceutical composition with light of an absorption wavelength sufficient to cleave the bonds between each instance of L and each instance of X upon illumination with the light (e.g., light between approximately 200 nm to 500 nm).