Capacitive Switch Sensing for Synchronized Surgical Smoke Extraction
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Solution Overview
Problem
Existing surgical devices face challenges in synchronously and reliably activating and deactivating smoke extraction devices, often requiring manual intervention, incompatible with various surgical generators, and prone to errors with shielded cables or background noise interference.
Innovation Solution
A surgical device equipped with a capacitive sensor and switch that measures capacitance changes to automatically and synchronously activate and deactivate the smoke extraction device with the surgical generator, eliminating the need for additional procedural steps and ensuring compatibility across different surgical generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual activation method is used, then operational simplicity is maintained, but activation synchronization and smoke evacuation efficiency deteriorate
Solution Approach 1:
The system automatically detects switch actuation through capacitive sensing and triggers smoke evacuation without requiring manual activation. The switch itself serves dual purposes: controlling the surgical generator and activating smoke evacuation through its capacitive characteristics, eliminating the need for separate activation controls.
Solution Approach 2:
The capacitive sensor provides real-time feedback about switch state to the control unit, which then automatically activates or deactivates the smoke evacuation device based on the detected capacitance changes, creating a closed-loop control system that synchronizes activation with surgical generator operation.
2Extent of automation
If inductive detection through cable is used, then automatic activation is achieved, but reliability deteriorates due to shielded cable interference
Solution Approach 1:
The capacitive sensor acts as an intermediary that detects switch actuation through capacitance changes rather than attempting to detect electrical signals through the surgical cable. This intermediary approach bypasses the shielded cable interference problem by using a different physical measurement principle that is not affected by cable shielding.
Solution Approach 2:
The patent replaces the electrical/inductive detection method with a capacitive sensing method. Instead of detecting current flow through the cable using inductive principles, the system measures capacitance changes at the switch, substituting one detection mechanism with another that is inherently more reliable in the presence of shielded cables.
3Extent of automation
If acoustic sensor is used, then automatic activation is achieved, but measurement precision deteriorates due to background noise
Solution Approach 1:
The patent substitutes acoustic detection with capacitive sensing. Instead of using an acoustic sensor to detect generator activation tones, the system uses a capacitive sensor to detect switch actuation directly through capacitance changes, eliminating background noise interference by measuring electrical characteristics rather than acoustic signals.
Solution Approach 2:
The capacitive sensor serves as an intermediary that directly measures the physical actuation of the switch through capacitance changes, providing a more precise and reliable detection method that is not subject to the background noise problems affecting acoustic detection of generator tones.
4Extent of automation
If direct generator connection is used, then automatic activation is achieved, but device complexity and compatibility requirements increase
Solution Approach 1:
The switch serves multiple functions: controlling the surgical generator and simultaneously activating the smoke evacuation device through capacitive sensing. This multi-functionality eliminates the need for separate activation mechanisms and reduces overall system complexity while maintaining automatic activation capability.
Solution Approach 2:
The switch automatically triggers smoke evacuation activation through its inherent capacitive characteristics when actuated. The system uses the switch's own physical properties to activate the functional device, eliminating the need for additional sensors, cables, or connection requirements between the generator and smoke evacuation device.
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 solution enables efficient, reliable, and energy-saving automatic activation of smoke extraction, reducing noise levels and the risk of smoke gas exposure, while allowing for easy integration with various surgical instruments and environments.
Implementation Method 1
The capacitive sensor (18) is configured to measure a capacitance change or capacitance at the measuring electrode (26) and to activate or deactivate the functional device (14) depending on the measured capacitance change or capacitance
Data Source
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AI summary
The invention relates to a surgical device (10) comprising a surgical generator (12), a functional device (14, 56, 58), a switch (16), and a capacitive sensor (18). The surgical generator (12) is configured to provide energy for an energy-based surgical instrument (34, 50, 52). The functional device (14, 56, 58) is configured to provide a function in an activated state. The switch (16) serves to activate and deactivate the surgical generator (12). The capacitive sensor (18) has at least one measuring electrode (26, 26a, 26b). The measuring electrode (26, 26a, 26b) is arranged on the switch (16). The capacitive sensor (18) is designed to measure a change in capacitance or capacitance at the measuring electrode (26, 26a, 26b) and, depending on the measured change in capacitance or capacitance, to activate or deactivate the functional device (14, 56, 58).