Plasma Ablation Probe for Cartilage Smoothing
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Solution Overview
Problem
Existing medical instruments fail to smoothly ablate cartilage surfaces without causing thermal damage, as prior RF and laser devices are not capable of achieving this while maintaining the integrity of cartilage tissue.
Innovation Solution
A plasma ablation device with an electrosurgical working end featuring dielectric bodies and opposing polarity electrodes, which ignites a plasma in a controlled gap to interface with tissue, allowing for precise ablation and smoothing of cartilage surfaces without thermal damage by maintaining the plasma temperature below 80°C.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If prior RF and laser devices are used to ablate cartilage tissue, then tissue ablation is achieved, but thermal damage is caused to cartilage tissue
Solution Approach 1:
The invention changes the energy delivery parameter from thermal (RF and laser) to plasma-based energy. The plasma is generated at controlled temperatures below 80°C, fundamentally altering the thermal parameters to eliminate thermal damage while maintaining ablation capability. This is achieved through controlled plasma generation using opposing polarity electrodes that create a plasma field without excessive heating.
Solution Approach 2:
The invention utilizes plasma phase transition - converting gas to an ionized plasma state through controlled electrical discharge between opposing polarity electrodes. This phase transition enables tissue ablation through plasma chemical reactions and ion bombardment rather than thermal heating, resolving the contradiction between effective ablation and thermal damage prevention.
2Manufacturing precision
If prior RF and laser devices are used to ablate cartilage, then some tissue removal is achieved, but smooth surface ablation is not capable
Solution Approach 1:
The invention applies local quality by creating a highly localized plasma field at the tissue interface through opposing polarity electrodes. The plasma is generated only where needed at the cartilage surface, enabling precise control over the ablation zone and achieving smooth surface treatment without affecting surrounding areas, thus maintaining both surface quality and ablation effectiveness.
Solution Approach 2:
The invention replaces the mechanical/thermal ablation mechanism of RF and laser devices with a plasma-based mechanism. The plasma field interacts with tissue through ion bombardment and chemical reactions, providing a gentler, more controlled ablation process that produces smooth surfaces without the harsh thermal effects of conventional devices.
3Object-affected harmful factors
If plasma is generated to ablate tissue, then thermal damage is prevented, but plasma temperature control below 80°C must be maintained
Solution Approach 1:
The invention incorporates feedback control through the use of opposing polarity electrodes that can be precisely controlled to maintain plasma temperature below 80°C. The electrical discharge parameters are regulated to ensure the plasma remains cold enough to prevent thermal damage while still achieving effective tissue ablation, creating a self-regulating system that maintains optimal temperature conditions.
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 device effectively smooths fibrillated cartilage surfaces without causing thermal damage or cell death, as demonstrated by tests showing no significant chondrocyte death and a smooth cartilage surface post-treatment.
Implementation Method 1
igniting a plasma in a controlled gap to interface with tissue
Implementation Method 2
opposing polarity electrodes configured for creating a current path within the interface
Data Source
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AI summary
Cartilage and other tissues are treated by generating a plasma in an interior space of a probe and exposing the tissue to the plasma. The plasma is released through a gap in a working end of the probe.