Ferromagnetic Coating Inductive Heating for Surgical Tools
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current surgical tools for tissue destruction and thermal therapies face issues such as unintended collateral tissue damage, slow heating and cooling times, and the risk of material fracture when exposed to body fluids, particularly with ferrite-based materials.
Innovation Solution
A thermally adjustable surgical tool system featuring a ferromagnetic coating over a conductor with an oscillating electrical energy source for inductive heating, allowing for precise control of thermal effects and rapid heating and cooling, integrated into devices like catheters and endoscopes with sensor feedback for real-time temperature adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If monopolar or bipolar electrosurgery modalities are used for tissue destruction, then tissue cutting and coagulation can be achieved, but unintended collateral tissue damage and deeper tissue effects occur due to current spread
Solution Approach 1:
The patent applies local quality by concentrating the oscillating electrical current specifically at the ferromagnetic coating location through magnetic field confinement. The ferromagnetic material localizes the electromagnetic energy deposition to a precise region, ensuring that only the targeted tissue receives thermal energy while adjacent tissues remain unaffected. This resolves the contradiction by achieving both precise tissue destruction and eliminating collateral damage through localized energy delivery.
2Reliability
If high voltage is used for electrosurgery to achieve hemostasis, then coagulation effectiveness is improved, but temperature control is lost leading to charring of target tissue
Solution Approach 1:
The patent implements feedback control by continuously monitoring the temperature at the ferromagnetic coating using a temperature sensor and adjusting the power delivery accordingly. The control system receives temperature feedback and modulates the oscillating electrical energy to maintain the temperature within a therapeutic range that achieves hemostasis without causing charring. This resolves the contradiction by providing both effective coagulation and precise temperature control through closed-loop feedback.
3Speed
If ferrite beads or alloy mixes in ceramics are used for rapid heating, then heating speed is improved, but material fracture occurs due to large temperature differential when exposed to body fluids
Solution Approach 1:
The patent employs composite materials by combining a ferromagnetic coating (such as nickel-iron alloy) with a biocompatible substrate material. This composite structure provides both the rapid heating capability of ferromagnetic materials and the mechanical integrity and biocompatibility of the substrate. The composite design prevents material fracture when exposed to body fluids while maintaining fast heating speed, resolving the contradiction between heating performance and material reliability.
4Object-affected harmful factors
If resistive heating elements are used for tissue destruction, then charring and deeper tissue damage are reduced, but heating and cooling times are slow making it difficult to work around tissue
Solution Approach 1:
The patent applies periodic action by using oscillating electrical energy at high frequency to heat the ferromagnetic coating. This oscillating current generates rapid thermal cycles that achieve quick heating and cooling of the targeted tissue. The periodic nature of the oscillating current allows for precise temporal control of thermal delivery, enabling the surgeon to rapidly heat when needed and just as rapidly cool when moving to adjacent areas, thus resolving the contradiction between minimizing charring and reducing heating/cooling time.
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 system enables precise thermal tissue destruction with reduced accidental damage, rapid thermal response, and improved safety by minimizing thermal spread and avoiding material fractures, while maintaining effective heat delivery and tissue manipulation.
Implementation Method 1
an oscillating electrical energy source for generating heat at the location of the coating. The oscillating electrical energy may cause inductive heating of the ferromagnetic coating.
Implementation Method 2
When excited by the magnetic field associated with high frequency current passing through a conductor, ferrite beads and alloy mixes in ceramics can reach high temperatures very quickly.
Implementation Method 3
an oscillating electrical energy source for generating heat at the location of the coating. The oscillating electrical energy may cause inductive heating of the ferromagnetic coating.
Data Source
AI summary
Thermally adjustable surgical tools include a conductor and a ferromagnetic material. The ferromagnetic material may be quickly heated when subjected to high frequency alternating current through the conductor. The ferromagnetic material may also cool rapidly because of its relatively low mass and the small thermal mass of the conductor. The thermally adjustable surgical tools may be used to sculpt, melt, break and/or remove biological material. The thermally adjustable surgical tools may also include balloon catheters which can heat fluid to thereby treat biological material.