Ferromagnetic Thermal Cutting Wire for Curie-Controlled Tissue Separation
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Solution Overview
Problem
Existing electrosurgical instruments face challenges in efficiently and accurately cutting treated tissue after coagulation or sealing, as they often require mechanical knives or energy-based methods that may not provide precise control over the cutting process.
Innovation Solution
The integration of a ferromagnetic thermal cutting wire with self-regulating properties, which heats to a specific Curie temperature for precise cutting, eliminating the need for additional sensors or feedback mechanisms, and ensures consistent temperature control by automatically adjusting based on tissue contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a mechanical knife is used to cut tissue, then cutting function is achieved, but device complexity and risk of mechanical damage increase
Solution Approach 1:
The patent replaces the mechanical knife system with a thermal cutting wire that uses electromagnetic induction and ferromagnetic heating to cut tissue. The cutting wire incorporates a ferromagnetic coating that converts electromagnetic energy into thermal energy, eliminating the need for mechanical moving parts while achieving the same cutting function through thermal energy.
Solution Approach 2:
The patent changes the cutting mechanism from mechanical force to thermal energy by controlling the temperature of the cutting wire. The ferromagnetic coating is designed to heat to a specific Curie temperature, providing precise thermal control for cutting without requiring complex mechanical adjustment mechanisms.
2Manufacturing precision
If energy-based cutting is used, then cutting precision is improved, but temperature control difficulty increases
Solution Approach 1:
The ferromagnetic coating on the cutting wire exhibits self-regulating temperature control through its Curie temperature property. When the coating reaches its Curie temperature, it loses its ferromagnetic properties, which automatically reduces the heating efficiency and prevents overheating. This self-regulating mechanism eliminates the need for external temperature sensors or feedback control systems.
Solution Approach 2:
The patent utilizes the phase transition of the ferromagnetic material at its Curie temperature to achieve automatic temperature regulation. The transition from ferromagnetic to non-ferromagnetic state at a specific temperature provides an inherent safety mechanism that prevents thermal runaway and ensures consistent cutting temperature without complex control electronics.
3Manufacturing precision
If ferromagnetic coating is applied to cutting wire, then temperature control is improved, but manufacturing complexity increases
Solution Approach 1:
The cutting wire is constructed as a composite structure with a conductive core and a ferromagnetic coating layer. This composite design allows the wire to simultaneously conduct electricity for heating while the ferromagnetic coating provides temperature regulation through its Curie temperature property. The coating can be applied through standard industrial processes such as plating or coating techniques.
4Manufacturing precision
If thermal cutting is used instead of mechanical knife, then tissue separation quality is improved, but risk of overheating increases
Solution Approach 1:
The ferromagnetic coating on the cutting wire exhibits self-regulating temperature control through its Curie temperature property. When the coating reaches its Curie temperature, it loses its ferromagnetic properties, which automatically reduces the heating efficiency and prevents overheating. This self-regulating mechanism eliminates the need for external temperature sensors or feedback control systems.
Solution Approach 2:
The patent converts the potential harmful effect of uncontrolled heating into a beneficial self-regulating mechanism. The Curie temperature transition, which could be seen as a limitation of the ferromagnetic material, is actually utilized as a safety feature that automatically prevents overheating and tissue damage.
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 ferromagnetic thermal cutting wire provides precise and controlled tissue cutting, preventing overheating and ensuring effective separation of treated tissue without mechanical damage, enhancing surgical precision and safety.
Implementation Method 1
the first portion defines a first Curie temperature and the second portion defines a second Curie temperature different from the first Curie temperature
Implementation Method 2
a ferromagnetic thermal cutting wire with self-regulating properties, which heats to a specific Curie temperature for precise cutting
Implementation Method 3
an energy-based tissue cutting element may be provided to cut the treated tissue using energy, e.g., thermal, electrosurgical
Data Source
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AI summary
An electrosurgical instrument includes an end effector assembly including first and second jaw members at least one of which is movable relative to the other from a spaced-apart position to an approximated position to grasp tissue between first and second opposed surfaces of the first and second jaw members, respectively. The first jaw member includes a thermal cutting wire including a first portion extending distally along at least a portion of a length of the first opposed surface and a second portion extending about a distal tip of the first jaw member. The first and second portions of the thermal cutting wire each include a ferromagnetic coating such that the first and second portions are ferromagnetically heated and provide automatic Curie temperature control upon supply of an AC signal thereto.