Thermal Cutting Element for Electrosurgical Instruments
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Solution Overview
Problem
Existing electrosurgical instruments face challenges in accurately and efficiently cutting treated tissue, as mechanical knives can be cumbersome and energy-based cutting methods may not consistently achieve the desired precision and effectiveness.
Innovation Solution
A thermal cutting element is integrated into electrosurgical instruments, comprising a base substrate with insulating layers and a heater circuit trace, capable of operating at high temperatures with a significant Temperature Coefficient of Resistance, and is powered by an electrosurgical generator that supplies an AC voltage signal to maintain the element at an optimal cutting temperature, while monitoring power and power slope to determine cut completion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical knife is used to cut treated tissue, then the tissue can be severed, but the instrument becomes cumbersome and less precise
Solution Approach 1:
The patent replaces the mechanical knife system with a thermal cutting element that uses electrical energy to generate heat for cutting tissue. The heater circuit trace converts electrical energy to thermal energy, eliminating the need for mechanical advancement of a knife blade between jaw members, thereby improving both ease of operation and cutting precision.
Solution Approach 2:
The patent changes the cutting mechanism from mechanical force to thermal energy by controlling the temperature parameter. The thermal cutting element operates at specific temperature ranges (e.g., 350°C to 550°C) to achieve effective tissue cutting, transforming the cutting process from a mechanical action to a thermally-controlled process.
2Device complexity
If energy-based cutting methods are used, then mechanical complexity is reduced, but cutting precision and effectiveness are inconsistent
Solution Approach 1:
The patent incorporates feedback mechanisms by monitoring power consumption and power slope during the cutting process. The electrosurgical generator detects changes in power parameters to determine cut completion, ensuring consistent and precise cutting effectiveness while maintaining simplified device architecture.
Solution Approach 2:
The patent achieves consistent cutting effectiveness by precisely controlling thermal parameters including operating temperature (350°C to 550°C), power levels (10V to 175V), and power density. These controlled parameter changes ensure reliable tissue cutting without requiring complex mechanical systems.
3Reliability
If high power is applied to heat the thermal cutting element, then cutting effectiveness improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the balance between cutting effectiveness and energy consumption by controlling the operating parameters within specific ranges: temperatures from 350°C to 550°C, voltages from 10V to 175V, and monitoring power levels. These parameter changes ensure reliable tissue cutting while minimizing unnecessary energy consumption.
Solution Approach 2:
The patent maintains continuous thermal action on the tissue during cutting, keeping the thermal cutting element at optimal temperature throughout the cutting process. This continuous useful action ensures consistent cutting effectiveness without requiring excessive power surges, thereby optimizing energy efficiency.
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 thermal cutting element efficiently and accurately cuts treated tissue by maintaining a high operating temperature, allowing for precise control and minimizing energy consumption, thereby enhancing the precision and effectiveness of tissue cutting in electrosurgical procedures.
Implementation Method 1
a heater circuit trace disposed on the at least one insulating layer. The thermal cutting element has an operating temperature of at least about 350° C.
Implementation Method 2
a Temperature Coefficient of Resistance (TCR) of at least about 50 ppm/° C.
Data Source
AI summary
A thermal cutting element of an electrosurgical instrument includes a base substrate defining a first side and a second side, at least one insulating layer disposed on at least the first side of the base substrate, and a heater circuit trace disposed on the at least one insulating layer. The thermal cutting element has an operating temperature of at least about 350° C. Temperature Coefficient of Resistance (TCR) of at least about 50 ppm/° C. An electrosurgical instrument and electrosurgical system including the thermal cutting element are also provided.