Alternating Current Iontophoretic Patch for Skin Safety
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Solution Overview
Problem
Traditional iontophoretic transdermal delivery methods using direct current face limitations such as skin injury, thermal damage, and reduced delivery efficiency due to capacitive charge buildup, necessitating an improved method for delivering therapeutic agents.
Innovation Solution
An iontophoretic system employing alternating current with balanced polarity output, utilizing a pair of electrode assemblies and an alternating power source to intermittently repel charged active agents into the skin, with a skin-conformable patch and electronics assembly for controlled delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct current is used for iontophoretic transdermal delivery, then the active agent can be delivered into the skin, but skin injury and thermal damage occur
Solution Approach 1:
The patent employs alternating current instead of direct current to create periodic reversals in current direction. This periodic action allows the system to deliver active agents into the skin while periodically reversing polarity to prevent capacitive charge buildup and reduce thermal damage, thereby resolving the contradiction between delivery efficiency and skin safety
Solution Approach 2:
The patent changes the electrical parameter from direct current to alternating current with balanced polarity output. This parameter change fundamentally alters how current interacts with skin tissue, enabling efficient drug delivery while minimizing harmful thermal effects and capacitive charge accumulation through the alternating polarity mechanism
2Productivity
If direct current is used for iontophoretic transdermal delivery, then the active agent can be delivered into the skin, but capacitive charge buildup reduces delivery efficiency
Solution Approach 1:
The alternating current creates periodic reversals that prevent continuous capacitive charge buildup in the skin. By periodically reversing the current direction, the system maintains more consistent delivery efficiency over time compared to direct current, which continuously accumulates capacitive charge that opposes further delivery
Solution Approach 2:
Changing from direct current to alternating current fundamentally changes the electrical parameter profile, transforming continuous charge accumulation into periodic charge-discharge cycles. This parameter change eliminates the progressive loss of delivery efficiency caused by capacitive charge buildup
3Productivity
If direct current is used for iontophoretic transdermal delivery, then the active agent can be delivered into the skin, but local anesthetic effect occurs resulting in burns
Solution Approach 1:
The alternating current periodically reverses polarity, preventing the sustained local anesthetic effect that occurs with direct current. This periodic reversal allows sensation to return between pulses, enabling the user to detect thermal damage before severe burns occur, while maintaining delivery efficiency through the alternating delivery mechanism
Solution Approach 2:
The patent changes the electrical parameter from direct current to alternating current with balanced polarity, fundamentally altering the interaction with skin tissue. This parameter change eliminates the progressive local anesthetic effect that masks thermal damage in direct current systems, while maintaining effective active agent delivery
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 enhances the efficiency and safety of transdermal delivery by minimizing skin irritation and allowing precise control over the amount of active agent absorbed, while avoiding capacitive charge opposition and thermal damage.
Implementation Method 1
Iontophoresis is a non-invasive method of propelling high concentrations of a charged substance, known as the active agent, transdermally by repulsive electromotive force using a small electrical charge
Implementation Method 2
the build up of capacitive charge in the skin layer which can oppose the electromotive driving forces thus reducing the rate and total amount of compound delivered over time
Implementation Method 3
direct current can cause a local anesthetic effect to the skin resulting in burns and other thermal damage to the skin
Data Source
AI summary
Embodiments of the invention provide patch assemblies for iontophoretic transdermal delivery of therapeutic agents. An embodiment provides a patch assembly comprising a conformable patch for delivery of the agent and having a tissue contacting side including an adhesive. The housing has a bottom surface for engaging a non-tissue contacting side of the patch, a current source such as a battery and a controller for controlling the delivery of the agent. The housing has sufficient flexibility such that when it is engaged with the patch to form the patch assembly and the patch is adhered to a target site on the patient's skin, the assembly has sufficient flexibility to deform with movement of the patient's skin to remain sufficiently adhered to the skin over an extended period of time to transdermally deliver a desired dose of the agent. Embodiments of the assembly may used to deliver a variety of therapeutic agents.