Electrosurgical Instrument Convex-Concave Coagulation Surfaces
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Solution Overview
Problem
Conventional electrosurgical instruments face issues with tissue slipping during procedures, especially in difficult-to-visualize areas or heavy bleeding, due to the lack of secure gripping, and the structured coagulation surfaces are expensive to manufacture and difficult to recondition.
Innovation Solution
The design features electrode parts with convex and concave coagulation surfaces of varying curvatures, creating a high-pressure area for secure tissue gripping, along with an insulating section to prevent short circuits and facilitate easy manufacturing and reuse, and integrated cutting instruments for precise tissue handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If structured coagulation surfaces (wave-shaped) are used to prevent tissue slipping, then tissue gripping security is improved, but manufacturing cost increases and reconditioning difficulty increases
Solution Approach 1:
The patent applies curvature to the coagulation surfaces by designing one surface as convex and the opposing surface as concave. This curved geometry creates a wedging effect that secures tissue between the surfaces during compression, eliminating the need for complex structured surfaces while maintaining reliable tissue gripping security.
2Reliability
If structured coagulation surfaces are used to prevent tissue slipping, then tissue gripping security is improved, but reconditioning difficulty increases
Solution Approach 1:
The simple convex-concave curved surfaces are much easier to recondition than complex wave-shaped structures. The smooth curved geometry allows for easier cleaning, polishing, and restoration of the coagulation surfaces, significantly reducing reconditioning difficulty while maintaining the wedging effect for secure tissue gripping.
3Reliability
If structured coagulation surfaces are used to prevent tissue slipping, then tissue gripping security is improved, but tissue adherence during procedure increases
Solution Approach 1:
The curved convex-concave surfaces create a controlled wedging effect that secures tissue without the complex interlocking geometry of structured surfaces. This reduces the surface area and complexity of contact between tissue and electrode, thereby reducing tissue adherence and making tissue release easier after the procedure.
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 solution provides secure tissue closure and easy handling, reducing tissue adherence and manufacturing costs, while allowing for precise cutting with reduced mechanical stress on the instrument, enhancing surgical efficiency and instrument durability.
Implementation Method 1
For coagulation 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
the curvatures run along longitudinal axes of the distal ends in such a way that the vessel or tissue that is held between the distal ends and extends perpendicularly to the longitudinal axes is retained with increasing pressure towards the first and second central sections
Data Source
AI summary
The invention relates to an electrosurgical instrument comprising two limbs that have an articulated connection and that can be actuated in the manner of a cutting or clamping tool. The instrument includes opposing electrode parts with coagulation surfaces on distal ends of its limbs for holding a vessel or tissue and for passing a current through said vessel or tissue to coagulate the latter and also current supply devices that supply the coagulation current from a high-frequency generator to the electrode parts. One of the coagulation surfaces is convex, at least in a first central section, and the opposing coagulation surface is concave, at least in a second central section. The radius of curvature of the concave coagulation surface is greater, at least in the second central section, than the radius of curvature of the convex coagulation surface in the first central section. The curvatures run along longitudinal axes of the distal ends in such a way that a vessel or tissue that is held between the distal ends runs perpendicularly to the longitudinal axes and is retained with a pressure that increases towards the first and second central sections.