Conductive Spacer Alignment for Electrosurgical Jaws
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Solution Overview
Problem
Existing electrosurgical instruments for laparoscopic operations face challenges in maintaining parallel alignment of high-frequency electrodes during end-to-end anastomosis of hollow vessels, leading to tissue damage and unsatisfactory welding due to non-conductive spacers causing coagulation shadows and potential perforation.
Innovation Solution
The use of conductive spacers integrated with the electrodes and non-conductive spacer abutment surfaces, arranged to maintain electrode parallelism and prevent tissue damage, ensuring uniform current distribution and minimizing coagulation shadows by optimizing spacer placement and material choice.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If non-conductive spacers are used to maintain electrode distance, then electrode alignment is improved, but tissue damage occurs due to compression and coagulation shadows
Solution Approach 1:
The patent introduces an electrically conductive gel as an intermediary substance between the electrodes and tissue. This gel replaces the traditional non-conductive spacers, allowing for continuous electrical current flow while maintaining electrode spacing. The gel fills the gap between electrodes and tissue, eliminating coagulation shadows and preventing tissue damage while ensuring proper electrode alignment.
Solution Approach 2:
The patent changes the electrical conductivity parameter of the spacing medium from non-conductive (traditional spacers) to conductive (gel substance). This parameter change allows the spacing medium to simultaneously maintain electrode distance and conduct electrical current, eliminating the harmful coagulation shadows caused by non-conductive spacers while preserving the beneficial electrode alignment.
2Object-affected harmful factors
If contact pressure is reduced to avoid tissue perforation, then tissue damage is minimized, but electrode parallelism is compromised
Solution Approach 1:
The patent employs a flexible gel material that can dynamically adapt to varying contact pressures. The gel's viscoelastic properties allow it to maintain electrode spacing and parallelism under compression without transmitting excessive force to the tissue, thus preventing perforation while preserving alignment. The gel deforms elastically to accommodate tissue contours while maintaining electrical contact.
Solution Approach 2:
The patent uses a composite approach by combining the structural support function (maintaining electrode spacing) with the electrical conduction function (allowing current flow) in a single gel material. This composite material exhibits both mechanical properties for spacing maintenance and electrical properties for current conduction, simultaneously addressing tissue protection and alignment requirements.
3Manufacturing precision
If multiple spacers are provided on clamping jaws, then electrode spacing is maintained, but tissue perforation becomes inevitable due to compression
Solution Approach 1:
The patent extracts the spacing function from discrete solid spacers and integrates it into a continuous gel medium. Instead of using multiple separate spacer elements that concentrate compression forces, the gel provides distributed spacing throughout the electrode-tissue interface, eliminating pressure points that cause perforation while maintaining consistent electrode spacing.
Solution Approach 2:
The gel material possesses a porous or heterogeneous internal structure that allows it to distribute compression forces across a larger area. This porous structure enables the gel to compress gradually under load, preventing sudden tissue perforation while maintaining electrode spacing through its rigidified or gelatinous matrix structure.
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 ensures reliable parallel alignment of electrodes, reduces tissue damage, and achieves homogeneous tissue fusion with consistent electrical current distribution, enhancing the quality and reliability of the sealing process.
Implementation Method 1
at least one of the spacers on at least one electrode is manufactured from an electrically conductive material and is connected to the electrode in electroconductive fashion
Implementation Method 2
For the purpose of welding the hollow vessel portions, the tissue grasped between two clamping jaws is exposed to electrical current which flows between electrodes provided on the two clamping jaws
Implementation Method 3
Thermofusion by means of high frequency technology (HF) is based on the denaturation of proteins which are contained in many tissue types. This allows to weld collagen-containing tissue. During the welding process, the tissue is heated up to temperatures above the protein denaturation temperature
Data Source
AI summary
An electrosurgical instrument including a jaw part made up of mutually movable instrument legs which have facing sides on which one or more electrode areas are arranged/formed in each case, the movement of the instrument legs relative to each other being able to be limited by at least one first spacer acting on proximal end portions of the instrument legs and at least one second spacer acting on distal end portions of the instrument legs. At least one of the spacers on at least one electrode is manufactured from an electrically conductive material and is connected to the electrode in electroconductive fashion. Furthermore, the spacer cooperates with a local spacer abutment surface which is made of a non-conductive material and arranged in electrically insulating manner on at least one opposing electrode.