Bipolar Membrane Ionic Drug Delivery via Electric Field Control
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Solution Overview
Problem
Existing drug delivery systems face challenges in accurately administering the appropriate amount of medication based on a patient's changing condition and environment, such as varying insulin doses for diabetic patients or antihypertensive agents for hypertensive patients, due to the difficulty in providing a precise and timely dosage.
Innovation Solution
A device with a storage module, bipolar membrane, electrodes, and control module that uses an ionic current to control the release of ionic materials, allowing for adjustable release amounts and periods based on detected concentrations and environmental conditions, utilizing a bipolar membrane with cationic and anionic polymers to selectively permit or block the passage of ions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a specific drug is injected or administered to treat patients, then the patient's condition can be addressed, but it is difficult and cumbersome to provide an appropriate amount of drug based on the patient's changing condition
Solution Approach 1:
The patent implements a dynamic drug delivery system where the release amount and release period of the ionic material are adjustable by controlling the direction and intensity of the electric field. The control module can modify these parameters in real-time based on the patient's condition changes, enabling adaptive dosage adjustment without manual intervention. This resolves the contradiction by making the system dynamically responsive to patient needs while maintaining ease of operation through automated control.
Solution Approach 2:
The sensing module detects the concentration of the ionic material in the human body and provides feedback to the control module. The control module then determines the release amount and release period based on this detection result, creating a closed-loop feedback system. This enables the device to automatically adjust drug delivery according to the patient's actual condition, resolving the contradiction between adaptability and ease of operation.
2Manufacturing precision
If an ionic current is used to control the release of ionic materials through a bipolar membrane, then precise control of release amount and period is achieved, but the device complexity increases
Solution Approach 1:
The patent replaces complex mechanical drug delivery mechanisms with an electric field-based control system. By using electrodes to generate an ionic current that passes through the bipolar membrane, the system achieves precise control of drug release without complex mechanical components. The bipolar membrane's selective permeability to ions, when combined with electric field control, provides precise dosage control while simplifying the overall device architecture compared to traditional mechanical pumps or valves.
Solution Approach 2:
The control module adjusts the direction and intensity of the electric field to control the release amount and release period of the ionic material. By changing electrical parameters (voltage, current direction) rather than mechanical parameters, the system achieves precise control with simpler actuation mechanisms. This parameter-based control resolves the contradiction by providing precision through electrical rather than mechanical means.
3Manufacturing precision
If a bipolar membrane with cationic and anionic polymers is used to selectively permit or block ion passage, then selective drug delivery to diseased area is achieved, but the device complexity increases
Solution Approach 1:
The bipolar membrane is constructed from composite materials including cationic polymers, anionic polymers, and optionally hydrophilic polymers. This composite structure provides selective permeability to ions while maintaining mechanical integrity. The combination of different polymer types creates a membrane that can selectively transport ions based on their charge, enabling targeted drug delivery to diseased areas without requiring complex external control mechanisms for selectivity.
Solution Approach 2:
The bipolar membrane exhibits local quality differences through its cationic and anionic polymer regions, which have different permeability characteristics. The cationic polymer region preferentially allows anion passage while blocking cations, and vice versa for the anionic polymer region. This local differentiation of membrane properties enables selective drug delivery to specific locations (diseased areas) while keeping the overall device structure relatively simple.
4Adaptability or versatility
If the release amount and release period of ionic material are adjusted by controlling the electric field, then appropriate dosage can be provided based on patient condition, but the device complexity increases
Solution Approach 1:
The control module serves multiple functions: it controls the direction of the electric field to determine release timing, adjusts the intensity of the electric field to control release amount, and coordinates with the sensing module to implement feedback control. By consolidating these multiple control functions into a single integrated module, the system achieves high adaptability for adjusting release parameters while minimizing device complexity through functional integration.
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 precise and controlled delivery of ionic materials, minimizing side effects and maximizing drug efficacy by focusing the drug's effect on the diseased area while reducing exposure to non-diseased areas, and operates independently of gravity, allowing for enhanced directional and locational flexibility in drug delivery.
Implementation Method 1
a bipolar membrane configured to pass the ionic material in a single direction based on an ionic current, electrodes, disposed on a lower end of the reservoir and an upper end of the bipolar membrane, respectively, configured to form an electric field generating the ionic current
Implementation Method 2
The bipolar membrane may include an anionic polymer having a first permeability to ions having same charges and a cationic polymer having a second permeability to ions having opposite charges
Implementation Method 3
a bipolar membrane configured to pass the ionic material in a single direction based on an ionic current
Implementation Method 4
The control module may be further configured to control the ionic material not to pass through the bipolar membrane by blocking generation of the ionic current by forming a depletion layer in a bonding portion of the bipolar membrane based on a reverse bias voltage
Data Source
AI summary
A device for delivering an ionic material includes a storage module including a reservoir configured to store the ionic material, a bipolar membrane configured to pass the ionic material in a single direction based on an ionic current, electrodes, disposed on a lower end of the reservoir and an upper end of the bipolar membrane, respectively, configured to form an electric field generating the ionic current, and a control module configured to control either one or both of a release amount and a release period of the ionic material passing through the bipolar membrane by adjusting a direction and an intensity of the electric field.