Active Electrode With Strand Structures For High Current Density
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Solution Overview
Problem
Conventional electrosurgical instruments face challenges in achieving high current densities and effective tissue vaporization due to the design of active electrodes, which often result in inefficient electrosurgical effects and potential damage from high electric fields.
Innovation Solution
The development of an active electrode with adjacently arranged strand-shaped or bead-shaped structures that concentrate the effective electrode area, providing a mechanically robust and high current density, allowing for efficient electrocauterization or vaporization of tissue, similar to conventional ball electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional ball electrode is used, then the electrode structure is simple and mechanically robust, but the effective electrode area is too large resulting in insufficient current density for effective tissue vaporization
Solution Approach 1:
The active electrode is segmented into multiple strand-shaped or bead-shaped structures arranged adjacently. Each strand or bead acts as an independent current-concentrating element, collectively providing the desired high current density while maintaining mechanical robustness through the array configuration.
Solution Approach 2:
The electrode surface is designed with non-uniform current distribution characteristics. The strand-shaped and bead-shaped structures create localized regions of high current density at their surfaces, while the spaces between them allow current to concentrate where needed for effective tissue interaction.
2Manufacturing precision
If the active electrode surface is made small to increase current density, then electrosurgical effectiveness improves, but mechanical robustness and damage resistance decrease
Solution Approach 1:
Instead of a single small electrode surface, the design uses multiple small strand-shaped or bead-shaped structures. This segmentation allows the total effective area to remain small for high current density, while the distributed configuration provides mechanical redundancy and robustness.
Solution Approach 2:
The active electrode combines multiple structural elements (strands and beads) into a composite configuration. This composite structure achieves both the small effective surface area needed for high current density and the mechanical strength provided by the multi-element arrangement.
3Productivity
If high current density is achieved through small electrode area, then tissue vaporization effectiveness improves, but the risk of damage from high electric fields increases
Solution Approach 1:
The electrode is divided into multiple strand-shaped or bead-shaped structures that distribute the high current density across several localized points. This segmentation concentrates current where needed for vaporization while the distributed configuration reduces the harmful effects compared to a single intense focal point.
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
This design enables a reliable and effective electrosurgical effect with higher current densities and improved mechanical robustness, reducing the risk of damage and enhancing control characteristics, while maintaining compliance with medical device regulations.
Implementation Method 1
A high current density arises there, and can bring about electrocauterization or a vaporization of tissue
Implementation Method 2
A high current density arises there, and can bring about electrocauterization or a vaporization of tissue
Implementation Method 3
operating parameters such as current, voltage, frequency, and impedance of the radiofrequency source
Data Source
AI summary
An active electrode (30) for an electrical surgical instrument (20) includes a plurality of strand-type or cord-type structures (42, 52) that are disposed next to one another as well as an electrode area. The electrode area includes surface regions (48, 58) of each of the plurality of strand-type or cord-type structures (42, 52).