Pin Electrode Coagulation Instrument Asymmetry
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Solution Overview
Problem
Existing electrosurgical instruments face challenges in miniaturization while maintaining effective vessel closure and cutting capabilities, with issues such as insulation problems and mechanical resilience due to increased precision requirements, which affect their ability to securely seal and cut vessels efficiently.
Innovation Solution
A coagulation and dissection instrument with pin electrodes, featuring a jaw arrangement and counter-jaw arrangement where the counter-jaw has a double function, forming both a fusion gap and a cutting gap, allowing for precise and secure vessel closure with a slim design that minimizes insulation issues and mechanical flexibility, using off-center electrode surfaces and counter-electrodes to concentrate current for efficient cutting and coagulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If electrosurgical instruments are miniaturized for laparoscopic use, then the device size is reduced and design space is minimized, but insulation problems occur and mechanical resilience decreases
Solution Approach 1:
The patent applies asymmetry by positioning the cutting electrode off-center relative to the coagulation electrodes. This asymmetric arrangement creates distinct functional zones: a narrow cutting gap on one side and wider coagulation gaps on the other sides. This design allows the instrument to maintain effective insulation distances for coagulation while enabling precise cutting functionality, resolving the contradiction between miniaturization and insulation reliability.
Solution Approach 2:
The patent implements local quality by creating different gap characteristics in different regions of the instrument. The cutting electrode forms a narrow gap for precise cutting, while the coagulation electrodes maintain wider gaps for effective vessel sealing. This localized differentiation allows each function to operate optimally within the miniaturized device structure, addressing both insulation requirements and functional effectiveness.
2Volume of moving object
If electrosurgical instruments are miniaturized, then the device size is reduced, but mechanical resilience and precision requirements increase leading to flexibility problems
Solution Approach 1:
The patent segments the instrument into functionally distinct electrode components: a cutting electrode and coagulation electrodes, each with specific geometric characteristics. This segmentation allows each component to be optimized for its specific function while maintaining overall mechanical stability. The cutting electrode can be narrower and more flexible, while the coagulation electrodes provide structural support, resolving the contradiction between miniaturization and mechanical stability.
3Productivity
If the electrode and counter-electrode are arranged in alignment for vessel coagulation, then vessel closure is achieved, but the ability to perform electric cut is compromised due to insulation problems
Solution Approach 1:
The patent uses asymmetric electrode arrangement where the cutting electrode is positioned off-center, creating a narrow cutting gap that enables effective cutting without requiring the same insulation distances as coagulation. This asymmetric design allows coagulation to occur between the coagulation electrodes with adequate spacing, while cutting occurs in the narrow gap created by the offset cutting electrode, thus resolving the contradiction between vessel closure efficiency and insulation problems.
4Device complexity
If a single counter-electrode is used for both coagulation and cutting, then device complexity is reduced, but the precision and effectiveness of both functions are compromised
Solution Approach 1:
The patent applies local quality by creating distinct functional zones with different geometric characteristics. The cutting electrode forms a narrow gap for precise cutting, while the coagulation electrodes create wider gaps for effective vessel sealing. This localized functional differentiation allows each electrode pair to be optimized for its specific purpose, achieving high functional precision without requiring complex multi-electrode systems.
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 instrument achieves a secure and efficient vessel seal with high bursting strength and precise cutting capabilities, even in miniaturized forms, reducing the risk of insulation problems and mechanical failure, while allowing for laparoscopic use with minimal design space.
Implementation Method 1
The closure of vessels is typically done in that the vessel to be fused is clamped between the jaws of a forceps-like instrument and energized, so that a coagulation effect will occur
Data Source
AI summary
The instrument comprises a jaw arrangement with two jaws that have, on their side facing the counter-electrode arrangement, rounded or flat electrode surfaces. The counter-electrode arrangement comprises at least one counter-electrode surface that may be rounded or flat. One of the electrode surfaces has a band edge preferably bordered by an insulator on one side, said band edge being adjacent to the adjacent electrode surface of the jaw arrangement. The counter-electrode surface has a band edge adjacent to the insulator facing the band edge of the one electrode surface. The band edges of the electrode surfaces acting as the coagulation surfaces are close enough such that they form cutting edges that develop a cutting effect with low voltages that are otherwise suitable only for coagulation. Accordingly, it is possible to provide fusion instruments that are extremely delicate, display lower thermal inertia and an excellent fusion and cutting effect.