Transdermal Delivery Apparatus Using Periodic Electromagnetic Fields
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Solution Overview
Problem
Mammalian skin's stratum corneum poses a significant barrier to the transdermal delivery of therapeutic substances due to its lipid bilayer structure, leading to inefficient delivery methods like iontophoresis and electroporation, which cause cellular damage and lack control over drug delivery rates.
Innovation Solution
An apparatus and method using a controlled electromagnetic field with alternating active and inactive portions, generated by a coil and controlled by a microcontroller, to increase dermal permeability by creating temporary voids in the stratum corneum for therapeutic substance passage, requiring significantly less energy than existing methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If iontophoresis or electroporation is used to increase dermal permeability, then therapeutic substance delivery is improved, but cellular damage and skin irritation occur
Solution Approach 1:
The patent applies periodic electromagnetic field pulses with specific duty cycles (active portion followed by inactive portion) to the stratum corneum. This periodic action temporarily disrupts the lipid bilayer structure during active pulses, creating permeability pathways for therapeutic substances, while the inactive portions allow tissue recovery, thereby reducing cumulative cellular damage compared to continuous high-energy methods like iontophoresis or electroporation.
Solution Approach 2:
The patent changes the physical parameters of the electromagnetic field application by using lower voltage levels (compared to electroporation) combined with specific pulse duration and duty cycle parameters. This parameter optimization allows sufficient energy to be delivered to disrupt the stratum corneum barrier just enough for substance penetration without causing excessive cellular damage, achieving a balance between productivity and harmful effects.
2Productivity
If high energy levels are employed to disrupt the lipid bilayer structure, then transdermal delivery is achieved, but control over drug delivery rate is lost
Solution Approach 1:
The patent incorporates feedback mechanisms through controlled electromagnetic field application where the pulse duration and duty cycle are precisely regulated. This feedback control allows the system to adjust the energy delivery dynamically, maintaining optimal disruption of the lipid bilayer structure sufficient for substance penetration while preventing excessive disruption that would lose control over delivery rate. The controlled parameters ensure reproducible and predictable delivery characteristics.
3Ease of operation
If conventional electromagnetic field application is used, then simplicity of operation is maintained, but dermal permeability increase is insufficient
Solution Approach 1:
The patent maintains ease of operation through a simple user interface while implementing periodic electromagnetic field pulses with optimized duty cycles. The automated control system handles the complex timing and sequencing of active and inactive portions, allowing users to simply apply the device without needing to manually control pulse parameters. This periodic action effectively increases dermal permeability through the mechanism described earlier while keeping the operation interface simple and user-friendly.
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
Achieves higher and controlled transdermal delivery of therapeutic substances with minimal cellular damage and side effects, allowing for precise targeting and reduced energy consumption, making it suitable for outpatient and homecare use.
Implementation Method 1
Therapeutic substance delivery techniques such as iontophoresis and electroporation rely on introducing sufficient energy to the stratum corneum to break up the inherent structure of the lipid bilayer, which disrupts the hydrophilic-hydrophobic orientation of the bilayer and creates regions of random orientation through which some substances may be introduced.
Implementation Method 2
producing an electromagnetic field; controlling the electromagnetic field so as to alternately produce active and substantially inactive electromagnetic field portions, each said active electromagnetic field portion including an electromagnetic field packet having a plurality of successive electromagnetic field pulses
Data Source
AI summary
An apparatus (40) is disclosed for facilitating transdermal delivery of therapeutic substances. The apparatus (40) comprises means (44) for producing an electromagnetic field, control means (26, 34) arranged to control said field producing means to alternately produce active and substantially inactive electromagnetic field portions. Each active electromagnetic field portion includes an electromagnetic field packet having a plurality of successive electromagnetic field pulses, and each substantially inactive electromagnetic field portion includes no electromagnetic field pulses. During use, when the electromagnetic field is incident on a patient, dermal permeability is increased. A corresponding method is also disclosed.