Electrosurgical Switching Circuit for Safe Cut-Coag Mode Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing instruments for coagulation and dissection of biological tissue are costly to manufacture, particularly in single-use applications, and lack efficient mechanisms for safe and simple operation.
Innovation Solution
An instrument with a tool featuring a cutting electrode and coagulation electrodes, utilizing an operating circuit with a switching unit that switches between dissection and coagulation modes based on an evaluation signal, eliminating the need for mechanical switches and allowing cost-effective production, including a semiconductor-based switching unit and optocoupler for safe energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical switches are used to switch between cutting and coagulation modes, then the instrument can be operated, but the device complexity increases and manufacturing costs rise
Solution Approach 1:
The patent replaces mechanical switches with electronic switching components (transistors, field-effect transistors, or integrated circuits) that are controlled by evaluation signals. The switching unit uses semiconductor-based components instead of mechanical contacts, eliminating moving parts while maintaining the ability to switch between cutting and coagulation modes. This substitution reduces mechanical complexity and improves reliability.
Solution Approach 2:
The patent introduces an evaluation circuit that processes evaluation signals and generates control signals to activate the switching unit. This intermediary electronic control system replaces direct mechanical switching, allowing mode changes to be controlled electronically based on signal evaluation rather than physical switch actuation.
2Adaptability or versatility
If mechanical switches are used for mode switching, then the instrument can change between cutting and coagulation modes, but spark or arc formation may occur
Solution Approach 1:
By replacing mechanical switches with solid-state electronic switching components, the patent eliminates the mechanical contacts that would otherwise generate sparks or arcs during switching operations. The electronic switches transition between states without physical contact breakdown, preventing harmful electromagnetic discharges.
Solution Approach 2:
The patent converts the potentially harmful switching operation into a controlled electronic process where the switching unit responds to evaluation signals in a manner that prevents harmful effects. The electronic switching mechanism inherently avoids the spark and arc problems associated with mechanical contacts while maintaining effective mode switching.
3Reliability
If complex switching mechanisms are used to ensure safe operation, then safety is improved, but manufacturing costs increase
Solution Approach 1:
The patent uses solid-state electronic components that are inherently more reliable than mechanical switches due to the absence of moving parts and contact wear. These electronic switching components can be manufactured using standard semiconductor fabrication processes, reducing per-unit costs while improving reliability and safety.
Solution Approach 2:
The switching unit is designed to automatically respond to evaluation signals without requiring complex external control mechanisms. The evaluation circuit and switching unit work together as an integrated system that self-regulates the switching between cutting and coagulation modes based on the evaluated signals, reducing the need for additional safety mechanisms and control 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
Enables safe, efficient, and cost-effective coagulation and dissection of biological tissue by selectively applying electrical energy, reducing manufacturing costs and preventing spark or arc formation, suitable for both multiple and single-use instruments.
Implementation Method 1
The operating circuit has a coupling arrangement, which includes an emitter component and a receiver component that are galvanically separated from each other. The triggering signal from the evaluation circuit can be transmitted via the emitter component to the receiver component that is connected to the switching unit or is associated with the switching unit.
Data Source
AI summary
An instrument for coagulation and dissection of biological tissue including a tool with coagulation electrodes and at least one cutting electrode. The electrodes are actuated via an operating circuit including an evaluation circuit, to which an external apparatus delivers an evaluation signal with first and second half-waves having opposite polarities. During at least one first half-wave, the evaluation circuit checks whether a first switch or a second switch are actuated on the instrument. Depending on the evaluation result, a triggering signal is transmitted to a switching unit. Depending on the triggering signal, the switching unit is switched into a first or second switching state. In the second switching state, no voltage suitable for dissection and no current suitable for dissection, respectively, is applied to the cutting electrode. In the first switching state, a voltage suitable for dissection or a current suitable for dissection is applied to the cutting electrode.