Bipolar Electrode Segmentation for Reliable Plasma Ignition
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Solution Overview
Problem
Existing bipolar electrodes for resectoscopes face challenges in reliably igniting plasma at the distal end due to difficulties in creating a consistent electrical connection between the neutral and active electrodes.
Innovation Solution
The bipolar electrode design features a proximal contact section, a middle section with a coaxial arrangement of the neutral and active electrodes, and a distal end section with exposed end areas for direct voltage application, ensuring reliable plasma ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the neutral electrode is connected via the resectoscope or a separate contact point on the patient, then the device structure is simplified, but plasma ignition at the distal end becomes unreliable
Solution Approach 1:
The bipolar electrode is segmented into distinct functional zones: a proximal contact section with electrical contacts, a central section with coaxial electrode arrangement, and a distal end section with exposed electrode ends. This segmentation allows the voltage to be applied directly at the distal end between the active and neutral electrode ends, ensuring reliable plasma ignition without requiring complex external connections through the patient's body.
Solution Approach 2:
The resectoscope shaft acts as an intermediary conductor that directly transmits electrical voltage from the power supply to the distal end of the bipolar electrode. This intermediary connection eliminates the need for complex patient contact points while ensuring reliable voltage delivery for plasma ignition at the treatment site.
2Power
If high currents are conducted through the active electrode, then effective treatment is achieved, but temperature problems occur
Solution Approach 1:
The active electrode employs a composite structure combining a copper conductor core with an outer coating layer. The copper core provides excellent electrical conductivity for high current transmission, while the outer coating material offers lower thermal conductivity to dissipate heat away from the electrode, thereby managing temperature during high-power operation.
Solution Approach 2:
The active electrode features a nested structure where a copper conductor is positioned within a hollow cylindrical conductor or surrounded by insulation layers. This nested arrangement allows the highly conductive copper core to carry high currents while the surrounding structures provide thermal management and electrical insulation.
3Reliability
If the distal end section has exposed electrode ends for direct voltage application, then plasma ignition is reliable, but insulation requirements increase
Solution Approach 1:
The insulation structure applies local quality by providing different levels of insulation in different sections: the proximal and central sections have comprehensive insulation surrounding both electrodes, while the distal end section has selective insulation that exposes only the necessary electrode ends for plasma ignition. This localized approach ensures reliable ignition while minimizing unnecessary insulation complexity.
Solution Approach 2:
The insulation structure transitions from a three-dimensional surrounding insulation in the proximal section to a more open, selective insulation arrangement at the distal end. This dimensional change allows the exposed electrode ends to be positioned in specific spatial relationships for optimal plasma ignition while reducing the overall insulation volume and complexity.
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 ensures reliable ignition of plasma during treatments by maintaining a consistent electrical voltage between the exposed end areas of the active and neutral electrodes, improving treatment efficacy.
Implementation Method 1
This ensures that the desired plasma is reliably ignited during treatment
Implementation Method 2
an electrical voltage applied via the contacts is present directly between the two end regions
Implementation Method 3
This copper conductor allows the necessary high currents to be safely conducted without causing temperature problems during treatment
Data Source
Figure 1~2
Figure 3~4
Figure 5~7
AI summary
A bipolar electrode for a resectoscope is provided, wherein the bipolar electrode (20) has a proximal contact section (25), a connecting middle section (26) and a connecting distal end section (27), wherein the bipolar electrode (20) has an active electrode (34) and a neutral electrode (38), wherein the neutral electrode (38) is formed in a hollow cylindrical shape in the middle section (26) and coaxially surrounds the active electrode (34), wherein the proximal contact section (25) has a first contact (30) of the active electrode (34) and a second contact (36) of the neutral electrode (38).wherein the neutral electrode (38) is surrounded by a first insulation (39) from the proximal contact section (25) to the distal end section (27), and wherein at the distal end section (27) both a first end region of the active electrode (34) and a second end region of the neutral electrode (38) are exposed, so that an electrical voltage applied via the contacts (30, 36) is directly between the two end regions.