Quadripolar Electrosurgical Forceps Diagonal Electrode Isolation
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Solution Overview
Problem
Conventional electrosurgical forceps face issues with increased tissue impedance due to thermal margins, leading to reduced coagulation effectiveness and potential tissue damage, as well as the risk of electrical short circuits when grasping thin tissue or applying excessive force.
Innovation Solution
The design incorporates a quadripolar electrode assembly with diagonally opposing electrode members, each connected to a separate high-frequency electric power source, preventing electrical current flow between electrode members and reducing lateral thermal margins, thereby minimizing the risk of short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional bipolar electrosurgical forceps are used to grasp and coagulate tissue, then hemostatis is achieved through current flow between opposing jaw members, but tissue impedance increases due to thermal margins causing reduced coagulation effectiveness and potential electrical short circuits
Solution Approach 1:
The single bipolar electrode system is segmented into four separate electrode members (two on each jaw member). Each electrode member can be independently controlled by separate high-frequency electric power sources, allowing independent current paths through the tissue. This segmentation prevents electrical short circuits between opposing electrodes and maintains coagulation effectiveness even when tissue impedance increases, as each electrode pair operates independently.
Solution Approach 2:
Electrically insulating material is introduced between the opposing electrode members on each jaw member. This intermediary prevents direct electrical contact and potential short circuits between electrodes, while still allowing the electrodes to grasp and coagulate tissue effectively. The insulating material acts as a mediator that maintains electrical isolation while preserving mechanical functionality.
2Strength
If opposing jaw members clamp onto thin tissue with excessive force to secure grasping, then mechanical holding is improved, but electrical short circuit risk increases
Solution Approach 1:
Electrically insulating material positioned between opposing electrode members prevents direct electrical contact even when excessive clamping force is applied to thin tissue. This intermediary ensures that mechanical holding strength can be maximized without compromising electrical isolation, as the insulating material maintains separation between electrodes under all compression conditions.
Solution Approach 2:
The electrode members are configured with asymmetric electrical isolation - each jaw member has two electrode members that are electrically isolated from each other, creating independent current paths. This asymmetric arrangement allows differential control of electrical current while maintaining symmetric mechanical grasping capability, enabling strong holding force without electrical short circuit risk.
3Adaptability or versatility
If thermal margin spreads laterally into tissue beyond jaw members to achieve broader coagulation, then hemostatis coverage is improved, but tissue damage to adjacent structures increases
Solution Approach 1:
The coagulation process is segmented into four independent electrode pairs rather than one bipolar pair. This allows precise control of current flow paths through different tissue regions, achieving broad hemostatis coverage by selectively activating different electrode combinations while limiting lateral thermal spread from any single electrode pair, thereby protecting adjacent tissue structures.
Solution Approach 2:
Different regions of tissue receive tailored coagulation treatment through selective activation of specific electrode members. Each electrode pair can be independently controlled to provide appropriate coagulation intensity and duration for local tissue conditions, achieving versatile hemostatis coverage while minimizing excessive thermal damage to adjacent structures through localized energy delivery.
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 enhances hemostasis and tissue-cutting capabilities by maintaining effective coagulation and reducing tissue damage, while eliminating the risk of electrical short circuits, thus improving the overall utility of the electrosurgical forceps.
Implementation Method 1
The flow of electrical current causes the living tissue to coagulate
Implementation Method 2
direct bipolar energy diagonally through the living tissue between the diagonally opposing first electrode members
Implementation Method 3
the impedance of the tissue to rise in the region between the contact surfaces of the opposing jaw members
Data Source
AI summary
Electrosurgical forceps that can provide improved hemostatis and tissue-cutting capabilities during surgical procedures. The electrosurgical forceps include opposing jaw members, each including first and second electrode members. The first and second electrodes included in the respective jaw members are disposed directly opposite one another, the first electrode members included in the respective jaw members are disposed diagonally opposite one another, and the second electrode members included in the respective jaw members are disposed diagonally opposite one another. A first high frequency (HF) electric power source is connectable across the first electrode members, and a second HF electric power source is connectable across the second electrode members, electrically isolating the first electrode members from the second electrode members, and allowing current to flow diagonally through the tissue between one or both of the first electrode members and the second electrode members.