Rotating Helical Cutting Electrode for Electrosurgical Wear Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electrosurgical instruments face challenges in maintaining the reliability and longevity of cutting electrodes due to high wear and tear during coagulation and cutting processes, especially in bipolar techniques where high current density leads to rapid electrode degradation and complex mechanics.
Innovation Solution
The design of a cutting electrode with a large cutting area that is used in sections, allowing for distributed wear through rotation, enabling precise linear cuts by controlling the effective section's interaction with the tissue, and a holding device with defined window areas for precise coagulation and cutting, forming bipolar or monopolar arrangements as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional cutting electrode with small surface area is used, then coagulation precision is improved, but coagulation effectiveness deteriorates due to insufficient coagulation surface
Solution Approach 1:
The cutting electrode is designed with a segmented structure featuring multiple cutting edges arranged circumferentially around a central axis. Each cutting edge functions as an independent coagulation point, allowing precise targeted coagulation while collectively providing sufficient coagulation surface area for effective treatment of larger tissue areas.
2Power
If high current density is applied to the cutting electrode, then cutting capability is improved, but electrode wear increases rapidly
Solution Approach 1:
The electrode distributes high current density across multiple segmented cutting edges rather than concentrating it at a single point. This segmentation allows each edge to operate at high power for effective cutting while the overall electrode structure experiences distributed wear, extending total service life.
Solution Approach 2:
The electrode rotates during operation, periodically bringing different cutting edges into contact with the tissue. This periodic action distributes the thermal and mechanical stress across all cutting edges over time, preventing any single edge from wearing out prematurely and extending the electrode's operational lifespan.
3Reliability
If a mechanical blade is used for cutting, then complete tissue severance is achieved, but mechanical wear on the cutting edge increases due to applied force
Solution Approach 1:
The electrode replaces traditional mechanical blade cutting with an electrosurgical cutting mechanism. High-frequency electrical current generates thermal effects and arcs that vaporize and separate tissue, eliminating direct mechanical contact between the cutting tool and tissue. This substitution dramatically reduces mechanical wear on the cutting edges while achieving complete tissue severance.
4Measurement precision
If the cutting electrode is replaced frequently due to wear, then cutting precision is maintained, but device complexity increases
Solution Approach 1:
The electrode's multiple cutting edges allow one edge to wear while others remain sharp, eliminating the need for frequent complete electrode replacements. The segmented design provides built-in redundancy, maintaining cutting precision throughout the electrode's service life and simplifying the overall system by removing complex replacement mechanisms.
Solution Approach 2:
Rotation of the electrode periodically presents fresh, sharp cutting edges to the tissue as previous edges wear. This periodic renewal of active cutting surfaces maintains cutting precision over extended periods without requiring electrode replacement, thereby reducing device complexity.
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 enhances the service life of the cutting electrode, allows for precise and reliable cutting, and reduces mechanical stress, enabling efficient and precise tissue treatment with reduced wear and tear.
Implementation Method 1
a high-frequency current is passed through the tissue to be treated so that it changes due to protein coagulation and dehydration
Implementation Method 2
a high current density is required for a cutting process, so that the tissue is completely severed by explosive vaporization of the tissue fluid
Implementation Method 3
a cut through the tissue is only possible if the electrical voltage between the active electrode and the tissue is high enough to ignite an electric arc
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
The invention relates to an electrosurgical instrument for cutting and/or coagulating a tissue to be treated, comprising at least one cutting electrode for conducting a HF current though the tissue for carrying out a cutting process, and comprising power supply devices for supplying the HF current at least to the cutting electrode. The design of the electrosurgical instrument is improved so that the cutting process can be carried out with an increased reliability while prolonging the serviceable life of the electrode at the same time. To this end, the cutting electrode is mounted on the electrosurgical instrument in a manner that enables it to rotate about a rotation axis and comprises at least one cutting area, which is provided in the form of a helical curve or similar three-dimensional curve running around the rotation axis and which is arranged in such a manner that when the cutting electrode rotates about the rotation axis, it is active over its length in sections on the tissue when this section falls below or is located within a defined window area.