Electrosurgical Electrode With Flattened Portion for Plasma Ignition
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Solution Overview
Problem
Conventional electrosurgical electrodes, such as loop and band electrodes, suffer from unreliable plasma ignition due to statistical distribution along their length, leading to inefficient tissue manipulation and higher production costs, especially with expensive materials like platinum-iridium alloys.
Innovation Solution
An electrosurgical electrode with a conductive wire having parallel rectilinear portions and a central portion with a flattened cross section, featuring the highest radius of curvature, which concentrates electric field strength and plasma ignition, allowing for reliable and efficient tissue manipulation while being cost-effective to produce.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a continuous wire with constant cross section is used as the electrode, then the electrode is simple to produce and handle, but the plasma is ignited with a statistical distribution over the entire length, preventing reliable ignition at a particular position
Solution Approach 1:
The electrode features a localized flattened portion (portion CC) with a specific cross-sectional geometry that creates a region of highest electric field strength. This local geometric modification concentrates plasma ignition to a specific position on the electrode, ensuring reliable and repeatable ignition at the desired location rather than random distribution along the entire wire length.
Solution Approach 2:
The flattened portion of the electrode wire is designed with specific curvature characteristics - having a smallest radius of curvature at the flattened region. This curvature design enhances the electric field concentration effect, ensuring that plasma ignites preferentially at the location with the highest field strength, which corresponds to the region with the smallest radius of curvature.
2Reliability
If a band electrode with rectangular cross section is used, then the contact area with tissue is increased, but the plasma is still ignited with a statistical distribution over the entire length, including at less advantageous positions
Solution Approach 1:
Instead of modifying the entire electrode structure, the invention applies a localized flattened portion to a specific region of the wire. This partial modification is sufficient to create the desired plasma ignition concentration effect while maintaining the simplicity of the overall electrode structure and manufacturing process.
Solution Approach 2:
The electrode wire is segmented into different portions with different cross-sectional characteristics - a first portion with a first cross section and a second flattened portion with a second cross section. This segmentation allows the electrode to have different properties at different locations, with the flattened portion specifically optimized for plasma ignition while the rest of the wire maintains its original simplicity.
3Reliability
If compressed tubes with different radii of curvature are used to create regions with different field strength, then plasma ignition is concentrated, but the production is particularly cost-intensive using expensive materials like platinum-iridium alloy
Solution Approach 1:
The invention changes the geometric parameters of the electrode wire by introducing a flattened portion with specific cross-sectional dimensions and curvature characteristics. This parameter modification creates the desired electric field concentration effect without requiring expensive materials, as the field concentration is achieved through geometry rather than material composition.
Solution Approach 2:
The electrode is designed to be produced from inexpensive materials such as tungsten or stainless steel rather than expensive platinum-iridium alloys. The flattened portion geometry provides sufficient plasma ignition concentration to make the electrode effective, eliminating the need to use costly materials that would be required if a different approach were used.
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 electrode ensures reliable and efficient plasma ignition at specific positions, enhancing tissue manipulation and extending electrode lifespan through even material wear distribution, with reduced production costs using affordable materials like tungsten or stainless steel.
Implementation Method 1
By the application of the radiofrequency alternating voltage, a plasma is ignited on the electrode so that a plasma is formed on the wire in interaction with the fluid surrounding the electrode
Data Source
AI summary
An electrode for an electrosurgical handheld instrument consists of an electrically conductive wire, the two ends of the wire being connectable to an electrode carrier of the handheld instrument. In this case, the wire has two portions R1 and L1, which are adjacent to the two ends of the wire and are aligned parallel to one another and rectilinearly. Two second portions R2 and L2 follow on from these two first portions R1 and L1, these two portions R2 and L2 being connected to one another by a portion C. This portion C in turn has a flattened portion CC.