Bipolar Electrosurgical Lead Assembly for Precise Tissue Cutting
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Solution Overview
Problem
Current bipolar electrosurgical devices for cutting tissue in laparoscopic surgery often face challenges in efficiently delivering electrosurgical energy to the tissue, leading to suboptimal cutting performance and potential tissue damage.
Innovation Solution
The tool assembly for electrosurgical devices includes a base portion, a return lead, an electrical insulator, and an active lead, where the active lead is securely fixed to the base and extends around a center pin, allowing electrosurgical energy to be efficiently transmitted through the tissue, with a configuration that maintains tension and prevents deflection during cutting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If bipolar electrosurgical devices use conventional electrode configurations, then the device structure is simple, but the cutting performance is suboptimal and causes tissue damage
Solution Approach 1:
The active lead is segmented into multiple sections (first section, second section, third section) with different configurations. The first section has a larger diameter for stable tissue contact, the second section is insulated for energy return, and the third section provides additional cutting surface. This segmentation allows each portion to perform its specific function optimally, improving cutting precision while reducing tissue damage through distributed energy delivery.
Solution Approach 2:
Different portions of the active lead have different local properties: the first section has a larger diameter for initial tissue engagement, the second section has insulation for controlled energy return, and the third section has specific surface characteristics for cutting. This local quality variation optimizes the interaction between the electrode and tissue at each location, enhancing cutting precision while minimizing harmful effects.
2Productivity
If the active lead is configured to maintain contact with tissue, then cutting efficiency is improved, but the device complexity increases
Solution Approach 1:
The active lead integrates multiple functions into a single component: tissue contact, energy delivery, and structural support. By combining these functions into one integrated active lead structure with multiple sections, the device achieves improved cutting efficiency without requiring separate components for each function, thus limiting the increase in device complexity.
Solution Approach 2:
The active lead serves multiple purposes simultaneously: it provides the cutting surface, maintains tissue contact through its flexible structure, delivers electrosurgical energy, and the insulated second section also serves as part of the energy return path. This multi-functionality improves cutting efficiency while avoiding the need for additional separate components.
3Loss of energy
If the return lead has a large surface area, then energy return efficiency is improved, but the device dimensions increase
Solution Approach 1:
The insulated second section of the active lead is nested within or adjacent to the return lead structure, allowing it to serve dual purposes: as part of the active electrode for energy delivery and as a contributor to the energy return path. This nesting arrangement improves energy return efficiency by utilizing the existing return lead structure rather than requiring a completely separate large-surface-area component, thus limiting the increase in device dimensions.
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 configuration enables high-efficiency cutting of tissue with reduced tissue damage, as the active lead maintains contact and the return lead provides a large surface area for energy return, facilitating precise and effective tissue severing.
Implementation Method 1
Upon activation, electrosurgical energy is transmitted from the active lead through tissue to the return lead to cut tissue in contact with the active lead
Data Source
AI summary
A tool assembly for use with an electrosurgical device for cutting tissue includes a base portion, a return lead, an electrical insulator, a center pin, and an active lead. The center pin extends from the base portion and through a lumen of the electrical insulator. The active lead is securely fixed to the base portion and extends between the base portion and a distal portion of the center pin such that a portion of the active lead extends around the distal portion of the center pin and first and second segments of the active lead are spaced apart from the return lead. Upon activation, electrosurgical energy is transmitted from the active lead through tissue to the return lead to cut tissue in contact with the active lead.