Pivotable Electrode Mount for Bipolar HF Surgical Instrument
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Solution Overview
Problem
Bipolar HF surgical instruments face challenges in maintaining parallel orientation of opposing electrodes, leading to inhomogeneous clamping pressure and irregular current flow, which affects the quality of tissue sealing and coagulation.
Innovation Solution
The instrument features electrode legs with a separate, rotatable and pivotable electrode mount that ensures parallel alignment of electrodes through a spring mechanism, maintaining constant electrode spacing for uniform tissue penetration and controlled clamping pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If electrodes are rigidly fixed on electrode legs, then structural simplicity is maintained, but parallel orientation and homogeneous clamping pressure cannot be ensured
Solution Approach 1:
The electrode mount is designed to be rotatable and pivotable relative to the electrode legs, allowing the electrodes to dynamically adjust their orientation to achieve parallel alignment during the closing movement, transforming a static rigid structure into a dynamic adjustable one
Solution Approach 2:
The electrode mount is separated from the electrode legs as an independent component, allowing it to be adjusted and positioned separately to ensure parallel orientation of the electrodes, dividing the originally integrated structure into modular segments
2Manufacturing precision
If electrode spacing is not controlled, then device simplicity is maintained, but current flow uniformity and tissue sealing quality deteriorate
Solution Approach 1:
The spring mechanism provides continuous mechanical feedback during the closing movement, automatically adjusting electrode spacing to maintain constant contact pressure and uniform spacing, creating a self-regulating system that compensates for variations in tissue thickness
3Manufacturing precision
If clamping pressure is not uniform, then operation simplicity is maintained, but tissue sealing quality and current distribution deteriorate
Solution Approach 1:
The spring-loaded electrode mount automatically adjusts and maintains uniform clamping pressure through its elastic properties, allowing the device to self-regulate pressure distribution without requiring manual adjustment by the operator
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 quality of tissue fusion by ensuring consistent clamping pressure and reproducible HF current distribution, reducing tissue damage and improving the precision of HF surgical procedures.
Implementation Method 1
at least said one electrode or electrode array (throughout its electrode length) mounted on the separate electrode mount is elastically/pliantly installed on the separate electrode mount
Implementation Method 2
The current flows through the path with the smallest resistance from the active electrode to the neutral electrode. In the direct vicinity of the active electrode, the current density is highest, which is the place where the strongest thermal effect occurs
Data Source
AI summary
A manually operable HF instrument in bipolar construction includes a jaw part having two electrode legs which can be moved relative to each other like pincers or scissors, and an instrument handle for operating and activating the jaw part. A separate electrode mount is articulated on at least one electrode leg of the jaw part so as to be able to pivot relative to it, an electrode in turn being elastically/pliably installed on the electrode mount.