Cartilage Treatment Probe With Flexible Tip and Insulated Electrode
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Solution Overview
Problem
Articular cartilage diseases like chondromalacia and osteoarthritis lead to cartilage fibrillation, causing stiffness and resilience loss, and degeneration if left untreated, necessitating a method to debride and smooth the cartilage surface with minimal collateral damage.
Innovation Solution
A cartilage treatment probe using radio-frequency energy delivered through a low-mass or low-surface area electrode with a flexible tip and non-conducting bumper to debride and smooth cartilage surfaces, minimizing chondrocyte death and excess tissue removal, while software controls maintain the device in an ablative mode to prevent excessive heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If radio-frequency energy is delivered through a low-mass or low-surface area electrode, then cartilage debridement and smoothing effectiveness is improved, but collateral damage to chondrocytes increases due to excessive heating
Solution Approach 1:
The patent changes the physical parameters of the electrode by adding mass and surface area, and by adding thermal insulation properties. This transforms the electrode from a low-mass, low-surface-area design to a higher-mass, higher-surface-area design with insulating characteristics, allowing controlled heat distribution that achieves effective cartilage debridement while preventing excessive heating that would kill chondrocytes
Solution Approach 2:
The patent introduces an intermediary structure between the RF energy source and the cartilage tissue. The electrode acts as a mediator that distributes thermal energy more uniformly across the cartilage surface, preventing localized overheating while maintaining effective debridement temperatures. The increased mass and surface area of the electrode serve as a thermal buffer that mediates between the energy source and the sensitive cartilage cells
2Stability of the object's composition
If a rigid electrode is used, then structural stability is improved, but accessibility to complex articular surface geometries deteriorates
Solution Approach 1:
The patent transforms the electrode from a rigid, static structure to a dynamic, flexible structure that can adapt its shape. The electrode is designed with flexibility to conform to the complex geometries of articular surfaces while maintaining structural integrity. This dynamic characteristic allows the electrode to reach difficult-to-access areas of the joint while preserving sufficient structural stability to deliver RF energy effectively
3Productivity
If high RF energy is used for rapid debridement, then productivity is improved, but collateral tissue removal increases
Solution Approach 1:
The patent changes the energy distribution parameters by increasing the electrode's mass and surface area, which allows the RF energy to be distributed more uniformly across the treatment area. This parameter change enables the use of higher total energy levels for rapid debridement while preventing localized energy concentration that would cause excessive removal of healthy tissue. The increased thermal mass of the electrode acts as a buffer that smooths energy delivery
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 probe effectively debrides and smooths cartilage surfaces with minimal collateral damage, maintaining cartilage viability and stability, suitable for treating chondromalacia lesions and stabilizing articular surfaces to slow down cartilage degradation.
Implementation Method 1
Radio-frequency energy delivered through a low-mass or low-surface area electrode can be used to rapidly debride cartilage fibrillations and smooth and/or seal the cartilage surface
Implementation Method 2
The flexible portion is configured to bias the electrically conductive surface towards a tissue surface
Implementation Method 3
The flexible portion includes a nitinol wire, a nitinol tube, a spring, or a distal portion of the shaft
Data Source
AI summary
An electrosurgical instrument for ablating cartilage while limiting collateral damage includes a non-conducting head with a small electrically conductive surface. The head of the instrument is coupled to a shaft by a flexible portion. The flexible portion biases the electrically conductive surface towards a tissue surface. The head is pivotably coupled to the shaft such that the electrically conductive surface is oriented substantially parallel to the tissue surface as the head slides across the tissue surface. A method of performing electrosurgery includes positioning the electrically conductive surface adjacent to the tissue surface, and sliding the shaft across the tissue surface with the head pivoting such that the electrically conductive surface is oriented substantially parallel to the tissue surface.