ESU Signal Detection Circuit Using Floating Ground Filtering
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Solution Overview
Problem
Electrosurgical units (ESU) interfere with bio-potential signal monitoring by generating noise, leading to false alarms due to their high-frequency and modulated signals, which existing software algorithms struggle to detect effectively, especially since they rely on low sampling rates for digital signal conversion.
Innovation Solution
A circuit and method utilizing a filter and detector configuration with a capacitor and resistor to process floating ground signals, passing high-frequency components and blocking low-frequency noise, and a rectifier to detect ESU signals, allowing for automatic correction algorithms in bio-potential signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If software algorithms are used to detect ESU signals, then detection capability is improved, but false alarms increase due to noise in the pass band of bio-potential signals
Solution Approach 1:
The patent segments the detection task into two parts: a high-pass filter that separates high-frequency ESU signals from low-frequency bio-potential signals, and a detector that processes only the filtered high-frequency components. This segmentation allows accurate ESU detection without interfering with bio-potential signal monitoring, thereby reducing false alarms while maintaining detection capability.
2Measurement precision
If high sampling rates are used for digital signal conversion, then ESU signal detection accuracy is improved, but system cost increases due to requirement for high-cost ADCs
Solution Approach 1:
The patent extracts the high-frequency ESU signal component from the mixed signal using a high-pass filter before digital conversion. By removing the low-frequency bio-potential signals and noise, the system can use lower sampling rates and less expensive ADCs while still achieving accurate ESU detection, thus reducing system cost without sacrificing detection accuracy.
Solution Approach 2:
The patent replaces the need for high-performance digital signal processing (which would require expensive high-speed ADCs) with an analog high-pass filter circuit. This analog preprocessing approach substitutes complex digital requirements with simpler analog circuitry, reducing ADC cost and system complexity while maintaining detection accuracy.
3Difficulty of detecting and measuring
If ESU signals are monitored using existing methods, then signal presence is detected, but reliability of bio-potential monitoring deteriorates due to noise generation
Solution Approach 1:
The patent introduces a high-pass filter as an intermediary component between the signal source and the detector. This filter acts as a mediator that allows high-frequency ESU signals to pass through to the detector while blocking low-frequency bio-potential signals and noise, thereby enabling reliable ESU detection without compromising bio-potential signal monitoring reliability.
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 effectively detects ESU signals without requiring high-cost ADCs, reduces false alarms, and simplifies circuit design by allowing voltage measurement relative to a floating ground, enhancing the reliability of bio-potential monitoring systems.
Implementation Method 1
a filter configured to process a floating ground signal associated with measuring a bio-potential signal of a patient
Implementation Method 2
a detector configured to output a sensing signal based at least in part on the floating ground signal and an Earth ground for detecting an electrosurgical unit signal
Data Source
AI summary
Circuits are provided for detecting an electrosurgical unit signal. An example circuit includes: a filter configured to process a floating ground signal associated with measuring a bio-potential signal of a patient, and a detector configured to output a sensing signal based at least in part on the floating grounding and the Earth ground for detecting an electrosurgical unit signal.