Electrosurgical Generator Measurement Range Switching for Accurate Output
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Solution Overview
Problem
Electrosurgical generators face challenges in accurately measuring a wide range of voltages and currents due to varying tissue resistivities, which can lead to inaccuracies and increased production costs when multiple measurement systems are used.
Innovation Solution
A measurement system with switchable configurations for voltage and current monitors that adapt to different operating sequences, ensuring accurate measurement across a wide range without additional hardware, using signal processing units that can be switched to optimize measurement accuracy based on the operating mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single measurement system is used to cover a wide voltage range, then the device complexity is reduced, but measurement precision deteriorates at low voltages due to the large measurement range
Solution Approach 1:
The measurement system dynamically switches between different measurement ranges based on the operating mode. The controller selects appropriate measurement configurations from multiple available configurations, enabling the system to adapt its measurement range in real-time. This dynamic adaptation allows accurate measurement across both low voltage (e.g., 200 V peak) and high voltage (e.g., 4000 V peak) conditions without requiring multiple fixed measurement systems.
2Measurement precision
If multiple measurement systems are used to cover different voltage ranges, then measurement precision is improved, but device complexity and production outlay increase
Solution Approach 1:
A single measurement system is designed with multiple measurement configurations that can be selectively activated. The measurement circuit includes multiple voltage dividers and measurement ranges that share common components. The controller intelligently selects the appropriate measurement configuration based on the operating mode, allowing one universal measurement system to perform the function of multiple specialized systems would otherwise be needed.
3Adaptability or versatility
If a large measurement range is used to cover high voltages, then the adaptability to different operating modes is improved, but measurement precision deteriorates in lower voltage regions
Solution Approach 1:
The measurement system is segmented into multiple measurement configurations, each optimized for specific voltage ranges. The system includes multiple voltage dividers with different division ratios and multiple measurement ranges that can be selectively engaged. This segmentation allows the measurement system to divide the wide voltage spectrum into manageable segments, with each segment measured by the most appropriate configuration, thereby maintaining high precision across the entire range.
Data Source
AI summary
An electrosurgical generator for supplying power, including an inverter for high voltage, which is led to an output to the connector of an electrosurgical instrument, a measurement system with at least one measurement monitor for a physical parameter at the output or at the electrosurgical instrument, and an operation controller which controls the inverter on the basis of at least one predefined operating sequence. The measurement monitor for the physical parameter is switchable between a plurality of different configurations which differ in the measurement range. The operation controller interacts with the measurement system so one of the different configurations of the measurement monitor is switched in each case, under control by the operating sequence. By switching the configuration, the suitable measurement range is always set during operation. Apparently contrariwise requirements in relation to a reliable measurement even at high amplitudes are linked with great measurement accuracy even at low amplitudes.