Conductive Polymer Electrode for Controlled Drug Release
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Solution Overview
Problem
Current medical devices for delivering therapeutic agents lack control over the release rate, which can lead to inefficient or unpredictable delivery of drugs within the body.
Innovation Solution
Incorporating a conductive polymer electrode within a medical device's reservoir, where changes in oxidation state, induced by applying a potential, cause the polymer to swell or shrink, thereby controlling the release of therapeutic agents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional medical devices are used for therapeutic agent delivery, then the devices can deliver drugs to target sites, but the release rate cannot be controlled or adjusted
Solution Approach 1:
The patent applies parameter changes by utilizing the oxidation state of the conductive polymer as a controllable parameter. By changing the oxidation state through electrical potential application, the polymer's physical properties (swelling/shrinking) change, which directly controls the therapeutic agent release rate. This transforms an uncontrollable passive delivery system into an actively controllable one through electrical parameter adjustment.
Solution Approach 2:
The patent replaces traditional mechanical control mechanisms (such as pumps, valves, or mechanical actuators) with an electrochemical system. Instead of using mechanical force to control release, the invention uses electrical potential to change the oxidation state of the conductive polymer, which then controls release through electrochemically-induced swelling and shrinking. This substitution enables more precise and easier control.
2Productivity
If the release rate is increased to deliver therapeutic agents more quickly, then the delivery speed improves, but the control and precision of delivery decreases
Solution Approach 1:
The patent implements feedback control through the electrical system. By monitoring and adjusting the electrical potential applied to the conductive polymer, the release rate can be precisely controlled. The electrical potential serves as both the control input and the measurement reference, enabling closed-loop control where the release rate can be maintained at desired levels through continuous electrical adjustment.
Solution Approach 2:
The invention uses continuous parameter changes in the electrical potential to achieve continuous control over the release rate. By varying the voltage or current applied to the conductive polymer, the oxidation state changes continuously, which in turn continuously adjusts the polymer swelling and the release rate, providing precise control across a range of delivery speeds.
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 method allows for controlled and adjustable release of therapeutic agents, enhancing the precision and effectiveness of drug delivery within the body.
Implementation Method 1
a rate of release of the therapeutic agent from the reservoir changes (e.g., release begins, increases, decreases, ceases, etc.) upon a change in the oxidation state of the conductive polymer
Implementation Method 2
changes in the oxidation state, induced by applying a potential, cause the polymer to swell or shrink
Data Source
AI summary
In accordance with one aspect, the invention relates to medical devices which comprise at least one reservoir, a therapeutic-agent-containing region disposed within the reservoir and an electrode comprising a conductive polymer. The devices of the invention are configured such that a rate of release of the therapeutic agent from the reservoir changes upon a change in the oxidation state of the conductive polymer.