Electrosurgical Hand Piece with Insulating Coating for Lead Extraction
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Solution Overview
Problem
Current monopolar RF-based lead extraction devices face challenges in delivering sufficient energy to dissect tissue when submerged in fluid environments like blood, due to reduced current density and impedance, making it difficult to remove cardiac leads encapsulated in fibrotic tissue.
Innovation Solution
An electrosurgical hand piece with a hollow electrode surrounded by an electrically insulating coating that degrades to expose a distal cutting edge, focusing energy and enabling effective tissue dissection and removal of cardiac leads in fluid environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monopolar RF energy is used to cut tissue in fluid environments, then patient safety is improved compared to bipolar RF, but the ability to deliver sufficient energy for tissue dissection deteriorates due to reduced current density and impedance
Solution Approach 1:
The electrode is designed with an insulating coating that covers most of its surface except for a small exposed portion at the distal tip. This creates a localized active cutting region with high current density while maintaining overall patient safety through the insulating coating on the rest of the electrode surface.
Solution Approach 2:
The insulating coating undergoes a phase change or degradation when exposed to RF energy and fluid, transitioning from an insulating state to an exposed conductive state at the cutting edge. This allows the electrode to generate sufficient impedance and current density for tissue dissection only where needed, while remaining safe elsewhere.
2Power
If the electrode surface is completely exposed to deliver high energy, then tissue dissection capability is improved, but current density drops and plasma generation becomes difficult when submersed in blood
Solution Approach 1:
Only a small portion of the electrode surface at the distal tip is exposed for cutting, creating a highly localized region of high current density. The insulating coating on the remainder of the electrode prevents current leakage into the surrounding blood, maintaining effective current density at the cutting site.
Solution Approach 2:
The insulating coating is selectively removed or degraded only at the distal cutting edge, extracting the conductive property from that specific location while maintaining insulation elsewhere. This allows plasma generation and high current density precisely where tissue dissection is needed.
3Productivity
If RF energy is delivered to dissect fibrotic tissue encapsulating the lead, then lead removal is achieved, but the insulating coating must degrade to expose the cutting edge
Solution Approach 1:
The insulating coating is pre-applied to the electrode before use, with the understanding that it will degrade in situ when RF energy is applied in the fluid environment. This preliminary coating provides initial safety and control, enabling the cutting function to activate only when and where needed during the procedure.
Solution Approach 2:
The insulating coating automatically degrades through exposure to RF energy and fluid environment, requiring no external activation or manual intervention. The coating self-destructs at the cutting edge when conditions are appropriate, enabling the electrode to transition from safe transport state to active cutting state autonomously.
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 device safely and effectively cuts tissue around medical leads, facilitating their removal without causing significant damage, even in challenging fluid environments, by concentrating energy at the distal edge and maintaining higher current density.
Implementation Method 1
An electrically insulating coating can surround the hollow electrode with the coating configured to degrade from and expose the distal cutting edge of the hollow electrode when the electrical energy is transmitted to the hollow electrode
Implementation Method 2
electrical energy from a power source to the hollow electrode... the tissue surrounding the medical lead can then be removed with the distal cutting edge of the hollow electrode
Implementation Method 3
When an RF electrode is completely submersed in blood as opposed to air, current density drops because the exposed surface of the electrode is in contact with the blood, which is a conductive medium, resulting in a lower impedance around the electrode
Implementation Method 4
modern RF electrosurgery technology leverages plasma generation by ionizing air to cause tissue dissection... creating plasma in such an environment is challenging
Data Source
AI summary
An electrosurgical hand piece device is configured to cut tissue with monopolar RF energy to extract a medical lead submersed in fluid. The device includes an electrode surrounded by an electrically insulating coating that can be exposed from a distal edge of the electrode when power is supplied to the device, thereby focusing the energy at the distal edge and enabling tissue to be more easily and safely cut from around the medical lead while in fluid.