Directional RF Ablation Needle Insulation Gap
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Solution Overview
Problem
Conventional radiofrequency ablation techniques often result in non-target tissue damage due to the ellipsoid nature of lesions, which can harm surrounding healthy tissues like nerves and blood vessels.
Innovation Solution
A directional RF ablation needle design featuring proximal to distal insulation with a gap or opening along its long axis, altering the RF field to provide specific and directional tissue ablation, minimizing exposure to sensitive structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional RF ablation needles are used to deliver RF energy to target tissue, then tissue ablation is achieved, but non-target tissue damage occurs due to the ellipsoid nature of lesions
Solution Approach 1:
The insulation coating is applied selectively to specific portions of the needle electrode rather than uniformly across the entire surface. This creates local quality variations where different segments of the needle have different electrical conductivity properties, enabling directional control of RF energy delivery to achieve effective ablation of target tissue while protecting adjacent non-target structures
Solution Approach 2:
The needle electrode is divided into multiple insulated and uninsulated segments along its length. This segmentation allows independent control of RF energy delivery from different needle portions, enabling the creation of non-ellipsoid, directional ablation zones that can be precisely tailored to match the geometry of target tissue while avoiding sensitive surrounding structures
2Area of stationary object
If RF energy is delivered omnidirectionally from the needle electrode, then comprehensive tissue coverage is achieved, but surrounding healthy tissues including nerves and blood vessels are damaged
Solution Approach 1:
Directional ablation is achieved by applying insulation coatings to specific angular or radial portions of the needle electrode surface. This creates localized active zones that direct RF energy preferentially toward target tissue in specific directions while leaving adjacent directions protected, thereby expanding effective coverage of the target area without proportionally increasing damage to surrounding healthy structures
Solution Approach 2:
The insulation coating acts as an intermediary element that selectively blocks or permits RF energy flow from the needle electrode surface. By strategically placing insulating material, the system mediates between the omnidirectional nature of RF energy generation and the need for directional energy delivery, allowing comprehensive target coverage while protecting vulnerable surrounding tissues
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 directional RF ablation needle reduces non-specific tissue destruction by creating a focused ablation field, allowing for precise targeting and minimizing damage to non-target tissues.
Implementation Method 1
When deployed, the needle electrode(s) which are electrically connected to a RF generator can transmit RF waves into the surrounding tissue in the target area causing ionic agitation. Ionic agitation occurs around an active electrode resulting in frictional heating in the tissue surrounding the electrode leading to lesions, cell death, and necrosis.
Implementation Method 2
Ionic agitation occurs around an active electrode resulting in frictional heating in the tissue surrounding the electrode leading to lesions, cell death, and necrosis.
Implementation Method 3
the insulating material having a gap or opening exposing a portion of the needle/electrode. In certain aspects the gap or opening has a long dimension along the long axis of the cannula and a short dimension perpendicular to the long axis. The directionality alters the RF field and results in an altered ablation field.
Data Source
AI summary
Certain embodiments are directed to radiofrequency (RF) ablation needle (cannula) design that alters the ablation field CN and enable a directionality to the ablation or RF field, i.e., directional RF needle/cannula. A directional RF ablation cannula described herein can be used to provide specific/directional tissue ablation. Such directionality allows the avoidance of sensitive structures or components of the body by positioning the RF field so that those non-target, sensitive structures or components are not within the ablation field.