Magnetic Current Sensor Insulation Body for Partial Discharge Control
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Solution Overview
Problem
Existing electrosurgical instruments face issues with precise current measurement under adverse conditions due to partial discharges between high-frequency current lines, leading to measurement inaccuracies and potential dielectric breakdowns, especially in high altitude or high humidity environments.
Innovation Solution
A current sensor design with an insulation body arranged between the lines within the central opening of the magnetic circuit, using non-polar materials like PE, PP, or PTFE to maximize the distance between lines and reduce capacitive leakage, thereby minimizing partial discharges and enhancing measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the two lines is increased to reduce partial discharges and capacitive leakage, then measurement accuracy and reliability are improved, but the device complexity and space requirements increase
Solution Approach 1:
An insulation body is introduced as an intermediary element between the two lines carrying high-frequency current. This insulation body acts as a mediator that increases the distance between the lines, reduces capacitive leakage current, and prevents partial discharges without requiring complete redesign of the current sensor structure.
Solution Approach 2:
The insulation body is positioned specifically in the central opening of the magnetic circuit where the two lines are closest to each other. This local intervention targets the critical area where partial discharges are most likely to occur, maximizing the effect while minimizing additional space requirements.
2Reliability
If the insulation thickness of the lines is increased to prevent dielectric breakdown, then safety and reliability are improved, but the space available in the current sensor is reduced
Solution Approach 1:
The insulation body serves as an additional intermediary insulating element that complements the line insulation. By placing this intermediate insulation between the lines, the system achieves enhanced dielectric strength without requiring excessive insulation thickness on the lines themselves, thus preserving space within the current sensor.
3Measurement precision
If the distance between lines is maximized to reduce capacitive leakage, then measurement precision is improved, but the time resolution may be affected
Solution Approach 1:
The insulation body is designed with specific material properties and dimensional parameters that optimize the balance between reducing capacitive leakage and maintaining fast response time. By carefully selecting the insulation material and thickness, the system reduces measurement noise and improves precision without introducing significant time delays.
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
The solution ensures reliable and accurate current detection even under adverse conditions, reducing measurement noise and improving the time resolution of current sensors, ensuring functional operation in environments like high altitudes and increased humidity.
Implementation Method 1
The insulation body arranged additionally between the lines in the central opening of the current sensor thereby increases the distance between the two lines, particularly the distance of their two conductors from one another, and thus reduces the capacitive leakage current as well as potential partial discharges.
Implementation Method 2
Between the lines a considerable voltage can be present depending on the treatment type which can result in partial discharges within the insulation of the lines guided in close proximity to each other
Implementation Method 3
A current sensor is known from practice comprising a magnetic circuit through which the line leading to the instrument as well as the line leading back from the instrument of the patient are passing. A sensor coil also provided on the magnetic circuit or other means for detection of a magnetic field provide a signal that characterizes the detected current.
Data Source
AI summary
A ring-shaped magnetic circuit is provided for a current sensor of an apparatus for supplying an instrument, wherein two lines supplying the instrument and a neutral electrode or the instrument pass through the magnetic circuit. The coatings of the two lines comprise sufficient thickness with regard to their dielectric strength to the voltage load of lines. The thickness is limited so that an insulation body fits between the two lines consisting of a nonpolar insulation material with high insulation capabilities, similar to the coatings, such as a plastic with a low loss angle. The insulation body reduces partial discharges in the area of the current sensor, which would otherwise result in electromagnetic emissions and thus distortions of the signals created by the current sensor.