Ceramic Coated Electrodes for High-Frequency IRE Impedance Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing irreversible electroporation (IRE) techniques face challenges in minimizing electrical impedance between electrodes and tissue, leading to inefficient energy delivery and potential tissue heating during high-frequency ablation procedures.
Innovation Solution
Applying a ceramic coating, such as titanium nitride, to the metal electrodes to reduce electrical impedance by 25% at specified frequencies above 100 kHz, using methods like electrochemical or physical vapor deposition, to enhance energy delivery during IRE procedures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ceramic coating is applied to the metal electrode, then electrical impedance between the electrode and tissue is reduced, but the device complexity and manufacturing process become more complex
Solution Approach 1:
The patent applies a ceramic coating (such as titanium nitride) over the metal electrode base material, creating a composite structure that combines the electrical conductivity of metal with the low-impedance properties of ceramic materials. This composite approach resolves the contradiction by achieving reduced electrical impedance while maintaining a manageable device structure through standardized coating processes.
Solution Approach 2:
The patent modifies the surface properties of the electrode by changing the material composition through ceramic coating. This parameter change in the electrode's electrical characteristics directly reduces the electrical impedance between the electrode and tissue, addressing the reliability improvement while the coating process itself is a well-established manufacturing technique that limits the increase in device complexity.
2Productivity
If high-frequency electrical energy is applied to achieve effective ablation, then tissue treatment effectiveness improves, but tissue heating increases causing potential damage
Solution Approach 1:
The patent changes the frequency parameter of the electrical energy applied to the tissue, using high-frequency alternating current (such as 100 kHz or higher). This parameter change enables effective ablation through irreversible electroporation while the rapid polarity reversals prevent excessive heat accumulation, thus resolving the contradiction between ablation effectiveness and tissue heating.
Solution Approach 2:
The patent employs periodic alternating current with rapid reversals in polarity (biphasic or multiphasic waves). This periodic action delivers sufficient energy for effective ablation during each cycle while the brief duration of each polarity phase prevents excessive heat buildup, thereby achieving productive tissue treatment without harmful thermal effects.
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
The ceramic coating significantly reduces impedance, optimizing energy delivery and minimizing tissue heating, thereby improving the effectiveness of IRE ablation procedures by ensuring more precise and efficient tissue treatment.
Implementation Method 1
Depositing the ceramic coating can include applying a process of electrochemical deposition or physical vapor deposition to the metal electrode
Implementation Method 2
Depositing the ceramic coating can include applying a process of electrochemical deposition or physical vapor deposition to the metal electrode
Implementation Method 3
identifying a thickness of a ceramic coating to be applied to the metal electrode that will reduce an electrical impedance between the metal electrode and the tissue at the specified frequency by a specified amount
Implementation Method 4
Irreversible electroporation (IRE) is a soft tissue ablation technique that applies short pulses of strong electrical fields to create permanent and hence lethal nanopores in the cell membrane
Implementation Method 5
IRE is a predominantly non-thermal process, which should cause an increase of the tissue temperature by, at most, a few degrees for a short time
Data Source
AI summary
A method for fabricating a medical device includes providing a metal electrode to be used in applying electrical energy to biological tissue and specifying a frequency at which the electrical energy is to be applied. A thickness of a ceramic coating to be applied to the metal electrode is identified so as to reduce an electrical impedance between the metal electrode and the tissue at the specified frequency by a specified amount. The ceramic coating is deposited over the metal electrode to the identified thickness, and the metal electrode is assembled onto a probe for application to the biological tissue.