Electro-surgical Electrode with Segmented Cutting and Coagulation Surfaces
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Solution Overview
Problem
Existing electro-surgical instruments with bipolar electrodes face limitations in simultaneously achieving effective cutting and coagulation due to the need for multiple electrodes and complex switching mechanisms, which complicates production and user operation.
Innovation Solution
An electro-surgical instrument design featuring a first electrode with a smaller surface area for cutting and a larger surface area for coagulation, allowing both functions with only two electrodes, eliminating the need for mechanical switches and compatible with standard generators by adjusting the output signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If asymmetric bipolar electrodes are used for cutting, then cutting effectiveness is improved, but coagulation capability deteriorates
Solution Approach 1:
The electrode surfaces are designed with dynamically switchable configurations through insulating layers that can be selectively removed or repositioned. This allows the same electrode pair to transition between asymmetric configuration (for cutting) and symmetric configuration (for coagulation), resolving the contradiction between cutting effectiveness and coagulation capability.
Solution Approach 2:
The electrode structure is segmented into multiple functional surfaces with different geometries. The first electrode has a first surface for cutting and a second surface for coagulation, while the second electrode similarly has differentiated surfaces. This segmentation allows selective engagement of appropriate surfaces based on the required function.
2Adaptability or versatility
If multiple electrodes with switching mechanisms are used, then both cutting and coagulation functions are achieved, but device complexity increases
Solution Approach 1:
Multiple electrode functions are merged into a single bipolar electrode assembly. The first and second electrodes each possess multiple surfaces that can serve different functions, eliminating the need for separate electrodes or complex switching mechanisms. The insulating layers are integrated directly into the electrode structure rather than being separate components.
Solution Approach 2:
The bipolar electrode assembly is designed as a universal tool that can perform both cutting and coagulation functions using the same two electrodes. By configuring the electrode surfaces and insulating layers appropriately, the same electrode pair serves multiple purposes, reducing device complexity while maintaining versatility.
3Power
If asymmetric electrode sizes are used for cutting, then current density increases, but temperature control for coagulation deteriorates
Solution Approach 1:
Different surfaces of the electrodes are designed with locally optimized geometries tailored to specific functions. The first surfaces are configured to generate high current density for cutting, while the second surfaces are configured for distributed current flow and temperature control during coagulation. This local differentiation allows each surface to excel at its designated function.
Solution Approach 2:
The electrode configuration parameters (surface area, shape, spacing) are changed between operating modes through the repositioning or removal of insulating layers. This transforms the electrical and thermal characteristics of the electrode-tissue interface, enabling high current density for cutting when needed and distributed current for temperature-controlled coagulation when needed.
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
Enables efficient and cost-effective cutting and coagulation without mechanical switches, ensuring effective tissue treatment and user-friendly operation with reduced production complexity.
Implementation Method 1
high-frequency cutting and high-frequency coagulation having two electrodes... connected during operation to an outlet of a high-frequency supply device
Data Source
AI summary
In an electro-surgical instrument (1), two electrode surfaces (25, 27) are provided for a first electrode (15, 31, 32, 34, 36) having different sizes, each forming a pair of electrodes with electrode surfaces (26, 28) of a second electrode (14, 16, 33). The smaller electrode surface (25) of the first electrode (15, 31, 32, 34, 36) can be used as the active electrode for cutting and the larger electrode surface (27) of the first electrode (15, 31, 32, 34, 36) is used for coagulation. During operation, the electrodes (14, 15, 16, 31, 32, 33, 34, 36) are connected to a two-pole outlet of a commercial generator that can switch between two output signals for cutting and coagulation. A layered, stacked structure of the effective area (8) of the instrument (1) of electrode bodies (14, 15, 16, 31, 32, 33, 34, 36) with intermediate insulating layers (17) allows a design resembling the shape of a knife or a blade (11).