Bipolar Resectoscope Electrode Layout to Prevent Short Circuits
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Solution Overview
Problem
Existing electrode instruments used in resectoscopes for prostate procedures risk damage due to conductive implants bridging the insulating gap between the working and counter electrodes, particularly with thin electrodes, leading to potential short circuits and wire melting.
Innovation Solution
The working and counter electrodes are spatially separated by a distance of at least 6 mm, preventing conductive connection by external conductors, and optionally using an insulator to ensure electrical isolation, thus preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the distance between working electrode and counter electrode is reduced to improve procedural efficiency, then operation speed increases, but the risk of short circuit by conductive implants increases
Solution Approach 1:
The patent introduces an insulating element as an intermediary component positioned between the working electrode and counter electrode. This insulator acts as a mediator that prevents direct electrical contact between the electrodes, blocking the harmful effect of conductive implants while allowing the electrodes to maintain a reduced spacing for efficient operation.
2Adaptability or versatility
If standard bipolar electrode instruments are used, then conventional procedures can be performed, but instrument damage risk increases when implants bridge the insulating gap
Solution Approach 1:
The patent applies beforehand cushioning by pre-positioning an insulating element between the working electrode and counter electrode before any potential contact with conductive implants. This protective measure is established in advance to prevent the harmful bridging effect, cushioning the system against potential instrument damage during procedures involving implants.
3Manufacturing precision
If thin loop electrodes are used to improve precision, then cutting precision increases, but wire melting risk increases due to locally increased current density
Solution Approach 1:
The insulating element serves as a protective intermediary that prevents direct contact between thin loop electrodes and conductive implants. By blocking the path for excessive current flow, the insulator protects the thin electrode wire from localized overheating and melting, preserving wire integrity while maintaining the precision advantages of thin electrodes.
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 significantly reduces the risk of instrument damage by ensuring electrical isolation, even when encountering conductive implants, maintaining instrument integrity during procedures.
Implementation Method 1
the working electrode and counter electrode are spaced apart from each other or arranged in such a way that the distance between them cannot be bridged by a conductor having a length of 6 mm or less
Implementation Method 2
An insulating layer is provided on the working electrode. In addition, a portion of the working electrode may be provided with an insulating covering.
Data Source
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AI summary
The invention relates to a bipolar electrode instrument for use in a resectoscope, wherein the electrode instrument has an elongated shaft section through which a first conductor extends, forming a working electrode at the distal end of the electrode instrument that can be acted upon with high-frequency current, and wherein a second conductor extends through the shaft section, forming a counter electrode in the distal end region of the electrode instrument, characterized in that the working electrode and the counter electrode are spatially separated from one another such that the distance between them cannot be bridged by means of a straight conductor having a length of 6 mm or less. Furthermore, the invention relates to resectoscopes for endoscopic surgery with a sheath tube, characterized in that an electrode instrument according to the invention is mounted longitudinally displaceably within the sheath tube.